Composites Part B: Engineering最新文献

Spider web-inspired sericin/polyacrylamide composite hydrogel with super-low hysteresis for monitoring penalty of sports competition 受蜘蛛网启发的丝胶/聚丙烯酰胺复合水凝胶具有超低滞后，可用于监测体育比赛的处罚情况

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-14 DOI: 10.1016/j.compositesb.2024.111983

Jingyu Chen , Yunyi Guo , Xueyan Zang , Yangyi Sun , Kunlin Chen

Conventional hydrogels often suffer from limitations such as poor hysteresis and low elasticity, significantly restricting their applications and service life. To address these issues, a spider web-inspired super-low hysteresis interpenetrating network hydrogel is designed using a straightforward in-situ thermal polymerization process. Stretching repeatedly within the range of human motion strain, this hydrogel can be rapidly restored to its original form using the formation of multiple hydrogen bonds and the introduction of the molecular spring structure of the β-sheet and α-helix in sericin, which means the service life of the hydrogel is increased imperceptibly. In addition, the sensitive sensing properties of the hydrogel allow for rapid feedback on the movement of human joints, making it possible to apply to considerably sophisticated human motion monitoring requiring rapid response. This kind of hydrogel with super-low hysteresis (1.65 %, ε = 100 %), transparency (88.84 % in 500 nm), rapid response (≈173 ms) and excellent sensitivity (GF = 2.88 in the strain range of 0–180 %) has great application prospects in intelligent judgment in sports competition and human body monitoring.

传统的水凝胶通常存在滞后性差和弹性低等局限性，大大限制了其应用和使用寿命。为了解决这些问题，我们设计了一种由蜘蛛网启发的超低滞后互穿网络水凝胶，采用了简单的原位热聚合工艺。在人体运动应变范围内反复拉伸，这种水凝胶可通过形成多个氢键和引入丝胶蛋白中β片和α螺旋的分子弹簧结构迅速恢复原状，这意味着水凝胶的使用寿命会在不知不觉中延长。此外，水凝胶灵敏的传感特性可以快速反馈人体关节的运动情况，使其有可能应用于需要快速反应的精密人体运动监测。这种水凝胶具有超低滞后（1.65 %，ε = 100 %）、透明度（在 500 纳米中为 88.84 %）、快速响应（≈173 毫秒）和卓越的灵敏度（在 0-180 % 应变范围内的 GF = 2.88），在体育竞技智能判断和人体监测方面具有广阔的应用前景。

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引用次数: 0

Engineered dECM-based microsystem promotes cartilage regeneration in osteoarthritis by synergistically enhancing chondrogenesis of BMSCs and anti-inflammatory effect 基于 dECM 的工程微系统通过协同增强 BMSCs 的软骨生成和抗炎作用，促进骨关节炎患者的软骨再生

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-13 DOI: 10.1016/j.compositesb.2024.111974

Ying Chen , Lin-Fei Chen , Ying Wang , You-Yu Duan , Sheng-Chang Luo , Yi-Cheng Wang , Ranjith Kumar Kankala , Shi-Bin Wang , Ai-Zheng Chen

The cartilage defects in osteoarthritis (OA) often result in loss of supporting and cushioning functionalities. Along this line, tissue engineering strategies for microfluidics based on high-precision control capabilities have been developed as promising long-term therapeutic solutions for cartilage regeneration in OA towards implementing anti-inflammatory effects and subsequent chondroprotective regeneration. In this study, an engineered microcarrier comprising composite porous microspheres based on decellularized extracellular matrix (dECM) and poly(lactic-co-glycolic acid) (PLGA) encapsulating icariin (ICA) was fabricated by microfluidic technology. This microcarrier, co-cultured with bone marrow mesenchymal stem cells (BMSCs), was developed as an injectable engineered microsystem for cartilage regeneration in OA. Mechanistically, dECM effectively repaired cartilage defects by inducing the differentiation of encapsulated stem cells to a cartilage phenotype through microenvironmental effects. In addition to enhanced secretion of active anti-inflammatory substances from BMSCs by dECM, the gradual release of ICA from the degraded PLGA PMs synergized anti-inflammatory effects in vivo, resulting in effective cartilage regeneration in OA. In short, the engineered microsystem indicated favorable effects in protecting and repairing cartilage, highlighting their potential as a promising therapeutic intervention for effectively ameliorating OA.

骨关节炎（OA）的软骨缺损通常会导致软骨失去支撑和缓冲功能。沿着这一思路，基于高精度控制能力的微流体组织工程策略已被开发出来，作为OA软骨再生的有前途的长期治疗方案，以实现抗炎效果和随后的软骨保护性再生。本研究利用微流体技术制造了一种工程微载体，它由基于脱细胞细胞外基质（dECM）和聚乳酸-共聚乙醇酸（PLGA）的复合多孔微球组成，其中封装了伊卡灵（ICA）。这种与骨髓间充质干细胞（BMSCs）共同培养的微载体被开发成一种可注射的工程微系统，用于 OA 的软骨再生。从机理上讲，dECM 通过微环境效应诱导包裹的干细胞向软骨表型分化，从而有效修复软骨缺损。除了dECM增强了BMSCs分泌活性抗炎物质外，降解的PLGA PMs逐渐释放出的ICA也在体内发挥了协同抗炎作用，从而有效促进了OA软骨再生。总之，工程微系统在保护和修复软骨方面表现出良好的效果，突显了其作为有效改善 OA 的治疗干预措施的潜力。

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引用次数: 0

Autologous myokine-loaded pre-vascularized bioactive scaffold enhances bone augmentation 自体肌酸负载预血管化生物活性支架可增强骨质增强效果

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-12 DOI: 10.1016/j.compositesb.2024.111967

Chunhui Wang , Yonghao Qiu , Yulian Yang , Qiyuan Dai , Xiaodong Cao , Longquan Shao , Fujian Zhao

The poor angiogenic ability is the main reason for the failure of bone augmentation material implantation. Pre-vascularized culture is considered to be an effective method to accelerate early angiogenesis, while the immune rejection has limited clinical application. Herein, since bone augmentation is an elective procedure, an easily accessible pre-vascularized silk fibroin/bioactive glass (SF-BG) scaffold without immune rejection was prepared by autologous intramuscular implantation. The SF-BG scaffolds exhibited outstanding vascularization ability in muscle by enhancing the muscle endocrine function. Further mechanism study confirmed that BG improved the synthesis and secretion of myokine irisin by regulating PI3K/Akt/PGC-1α/FNDC5 signaling pathway. After implantation in the bone augmentation position, the pre-vascularized BG scaffold with irisin loaded fostered the early angiogenesis of implantation and increased bone augmentation at the late stage. This study proposed a new idea for bone augmentation by autologous intramuscular pre-vascularized scaffolds.

血管生成能力差是骨增量材料植入失败的主要原因。预血管化培养被认为是加速早期血管生成的有效方法，但免疫排斥反应限制了其临床应用。在此，鉴于骨增量是一种选择性手术，我们通过自体肌肉植入的方法制备了一种易于获得的无免疫排斥的血管前丝状纤维蛋白/生物活性玻璃（SF-BG）支架。通过增强肌肉内分泌功能，SF-BG 支架在肌肉中表现出卓越的血管化能力。进一步的机理研究证实，BG通过调节PI3K/Akt/PGC-1α/FNDC5信号通路，提高了肌动素鸢尾素的合成和分泌。在骨增量位置植入后，负载鸢尾素的预血管化 BG 支架促进了植入早期的血管生成，并增加了后期的骨增量。这项研究提出了利用自体肌肉内预血管化支架进行骨增量的新思路。

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引用次数: 0

On demand thermal surface modification of carbon fiber for improved interfacial shear strength 按需对碳纤维表面进行热改性以提高界面剪切强度

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-12 DOI: 10.1016/j.compositesb.2024.111959

Manesha Fernando , Piers Coia , Mark G. Moloney , Bhagya Dharmasiri , David J. Hayne , Timothy Harte , Elmer Austria Jr. , Behnam Akhavan , Luke C. Henderson

A thermally triggered, on demand, surface modification method was exploited using carbon fibers (CFs). Bisdiazomethanes undergo thermal activation to generate extremely reactive carbene intermediates, able to react with the CF surface. Herein, the surface modification of continuous CFs is demonstrated by dipping the fibers in a solution of bisdiazomethane at three different concentrations of 1 mmol, 5 mmol, and 10 mmol, followed by air drying and heating at 120 °C. Tensile strength and Young's Modulus values were preserved in the treated fibers, while the interfacial shear strength (IFSS) values showed significant improvement. The highest IFSS improvement was found (189 %) for the fibers dipped in the 5 mmol solution, with significant increases noted for the 1 and 10 mmol modifications, of 54 % and 97 %, respectively. When the thermal modification was repeated with parameters analogous to a sizing application used in CF manufacture (30 s dip, 2-min heating), 74–79 % improvements in IFSS resulted. Hence, this approach can serve as a simple, scalable, and tunable surface modification method for discontinuous CFs that promotes their use in high value applications.

我们利用碳纤维（CF）开发了一种热触发、按需表面改性方法。双二噻唑甲烷经过热活化后会生成极具活性的碳烯中间体，并能与碳纤维表面发生反应。在此，通过将纤维浸入 1 毫摩尔、5 毫摩尔和 10 毫摩尔三种不同浓度的双二噻唑甲烷溶液中，然后在 120 °C 下风干和加热，展示了连续碳纤维的表面改性。经处理的纤维的拉伸强度和杨氏模量值保持不变，而界面剪切强度（IFSS）值则有显著改善。浸泡在 5 毫摩尔溶液中的纤维的界面剪切强度提高幅度最大（189%），而经过 1 毫摩尔和 10 毫摩尔改性的纤维的界面剪切强度也有显著提高，分别提高了 54% 和 97%。当重复进行热改性时，参数类似于 CF 生产中使用的上浆应用（浸渍 30 秒，加热 2 分钟），IFSS 提高了 74-79%。因此，这种方法可以作为一种简单、可扩展和可调整的非连续 CF 表面改性方法，促进其在高价值应用中的使用。

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引用次数: 0

Microchannels-enabled vertical alignment of hexagonal boron nitride in silicone rubber composites to achieve high through-plane thermal conductivity 通过微通道实现硅橡胶复合材料中六方氮化硼的垂直排列，从而实现高通过面热导率

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-12 DOI: 10.1016/j.compositesb.2024.111965

Yuan Ji , Chunhai Li , Hong Wu , Shaoyun Guo , Fengshun Zhang , Jianhui Qiu

Hexagonal boron nitride (h-BN) with high vertical alignment in polymer composites is necessary to improve through-plane thermal conductivity (TC) for thermal management applications. However, how to achieve simple, efficient and precise control of h-BN vertical alignment in polymer composites remains a challenge. Herein, a novel concept of inducing vertical alignment of h-BN in silicone rubber (SR) composites via controlling flow patterns in specially designed microchannels was proposed. The extremely strong elongational and shear stresses provided by the narrow section of the microchannels induced h-BN to align perpendicular to the flow direction. In the subsequent channel, the weak shear stress manipulated h-BN to form a ladder structure in the SR composites, including the vertical core layer and horizontal skin layer. Such ladder structure not only improved the through-plane TC of SR composite but also prevented overheating in the face of local heat sources. Moreover, the obtained SR composites exhibit a through-plane TC of 5.08 W/mK at 34.3 vol % h-BN loading when the horizontal skin layer was removed, indicating excellent heat transfer efficiency for thermal management application. We believe that this work would strengthen both scientific and technological cognition of the filler alignment during polymer composites processing.

聚合物复合材料中高度垂直排列的六方氮化硼（h-BN）是提高热管理应用中通面导热率（TC）的必要条件。然而，如何在聚合物复合材料中实现简单、高效和精确的六方氮化硼垂直排列控制仍然是一个挑战。本文提出了一个新概念，即通过控制专门设计的微通道中的流动模式，诱导硅橡胶（SR）复合材料中的 h-BN 垂直排列。微通道狭窄部分提供的极强伸长应力和剪切应力诱导 h-BN 垂直于流动方向排列。在随后的通道中，微弱的剪应力操纵 h-BN 在 SR 复合材料中形成阶梯结构，包括垂直核心层和水平表皮层。这种阶梯结构不仅改善了 SR 复合材料的通面 TC，还防止了在局部热源作用下出现过热现象。此外，当去除水平表皮层时，所获得的 SR 复合材料在 34.3 vol % h-BN 负载条件下的通面 TC 值为 5.08 W/mK，这表明其在热管理应用中具有出色的热传导效率。我们相信，这项工作将加强对聚合物复合材料加工过程中填料排列的科学和技术认知。

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引用次数: 0

Ultra-lightweight asymmetric hierarchical porous structure for high-efficiency absorption-dominated electromagnetic interference shielding 用于高效吸收电磁干扰屏蔽的超轻非对称分层多孔结构

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-12 DOI: 10.1016/j.compositesb.2024.111969

Pengcheng Zhang , Haiyang Li , Haoyu Liang , Huanping Wang , Xiangkun Shan , Yuhang Wang , Xiaoyu Fan , Ke Xu , Qiuyu Zhang , Yanhui Chen

In this work, ultra-lightweight composite aerogels with a hierarchical pore structure consisting of hollow Fe₃O₄ microspheres (∼250 nm), hollow MXene microspheres (∼580 nm) and pores (10–40 μm) in polyimide (PI) aerogel are developed through directional freezing, followed by freeze drying and thermal annealing. The composite aerogels exhibit a distinct asymmetric structure, with a top Fe₃O₄/PI aerogel layer designed for impedance matching and a bottom MXene/PI aerogel layer aimed at enhancing attenuation. This deliberate structure design not only reduces the density of the composite aerogels but also greatly enhances their absorption of electromagnetic waves. The composite aerogel demonstrates an impressive X-band EMI SE of 69.7 dB, a remarkable absorption coefficient (A) of 0.73, and an excellent surface-specific SE (SE divided by material density and thickness) of 13352 dB cm² g⁻¹, achieved at a density of just 0.034 g/cm³. Moreover, the composite aerogel exhibits outstanding stability in compression and shielding performance. Following 100 cycles of compression, the compressive strength remains at 94.9 % of the initial compressive strength (98 kPa), and its EMI SE maintains 68.5 dB with a retention rate of 98.2 %. Additionally, the composite aerogel presents outstanding thermal insulation (0.046 W m⁻¹ K⁻¹) and thermal resistance (initial decomposition temperature > 500 °C). This work provides novel insights into the design and fabrication of ultra-lightweight and absorption-dominated EMI shielding materials.

在这项研究中，通过定向冷冻、冷冻干燥和热退火，开发出了具有分层孔隙结构的超轻复合气凝胶，这种结构由空心 Fe3O4 微球（∼250 nm）、空心 MXene 微球（∼580 nm）和聚酰亚胺（PI）气凝胶中的孔隙（10-40 μm）组成。复合气凝胶呈现出明显的非对称结构，顶部的 Fe3O4/PI 气凝胶层旨在实现阻抗匹配，底部的 MXene/PI 气凝胶层旨在增强衰减。这种特意设计的结构不仅降低了复合气凝胶的密度，还大大增强了其对电磁波的吸收能力。复合气凝胶的 X 波段电磁干扰 SE 值高达 69.7 dB，吸收系数 (A) 为 0.73，表面特定 SE 值（SE 除以材料密度和厚度）为 13352 dB cm2 g-1，而密度仅为 0.034 g/cm³。此外，复合气凝胶还具有出色的压缩稳定性和屏蔽性能。压缩 100 次后，压缩强度保持在初始压缩强度（98 kPa）的 94.9%，EMI SE 保持在 68.5 dB，保持率为 98.2%。此外，复合气凝胶还具有出色的隔热性（0.046 W m-1 K-1）和耐热性（初始分解温度为 500 °C）。这项研究为设计和制造超轻型、以吸收为主的 EMI 屏蔽材料提供了新的见解。

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引用次数: 0

Personalized customization of in-plane thermal conductive networks by a novel electrospinning method 利用新型电纺丝方法个性化定制面内导热网络

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-12 DOI: 10.1016/j.compositesb.2024.111971

Wei-Hua Han , Qing-Yu Wang , Yu Long , Meng Xin , Yun-Ze Long , Chun-Cheng Hao

Using one-dimensional (1D) nanofibers to induce the assembly of two-dimensional (2D) nanosheets is of great practical significance; naturally, electrospinning, as the most effective method to prepare long nanofibers, has attracted widespread attention. In this paper, a novel electrospinning method that can induce the directional deposition of nanofibers through electrode arrays has been proposed, optimized, and further applied to regulate the aligned assembly of boron nitride nanosheets (BNNSs) to prepare highly thermally conductive and electrically insulating polyvinylidene fluoride (PVDF)/BNNS composites. In particular, the intermittent-contact collection mode of electrospun nanofibers has further enriched the electrospinning system. The composites prepared by our strategy possess high in-plane thermal conductivity (18.86 W/(m·K)), volume resistivity (nearly 10¹⁵ Ω cm), and breakdown strength (nearly 380 kV/mm). Furthermore, excellent mechanical properties, flexibility, and thermal conduction capability are vividly demonstrated. The proposed electrospinning method and the prepared PVDF/BNNS composites have great potential in the thermal management application of electronic devices in the 5G era.

利用一维（1D）纳米纤维诱导二维（2D）纳米片的组装具有重要的现实意义，而电纺丝作为制备长纳米纤维的最有效方法，自然也受到了广泛关注。本文提出并优化了一种新型电纺丝方法，该方法可通过电极阵列诱导纳米纤维定向沉积，并进一步应用于调节氮化硼纳米片（BNNS）的排列组装，从而制备出高导热性和电绝缘性的聚偏二氟乙烯（PVDF）/BNNS 复合材料。特别是电纺纳米纤维的间歇接触收集模式进一步丰富了电纺系统。采用我们的策略制备的复合材料具有较高的面内热导率（18.86 W/(m-K)）、体积电阻率（近 1015 Ω cm）和击穿强度（近 380 kV/mm）。此外，还生动地展示了优异的机械性能、柔韧性和热传导能力。所提出的电纺丝方法和制备的 PVDF/BNNS 复合材料在 5G 时代电子设备的热管理应用中具有巨大潜力。

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引用次数: 0

Bird's nest inspired aerogels towards ultrahigh strength and robust flame retardancy at extreme environment 受鸟巢启发的气凝胶可在极端环境下实现超高强度和强阻燃性能

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-12 DOI: 10.1016/j.compositesb.2024.111966

Hong Zhang , Haiyun Ma , Huiqi Gao , Le Yang , Chang Wang , Yunhong Jiao , Jianzhong Xu

The mechanical properties of aerogels remain a critical concern for their application. Inspired from the hierarchical architecture of bird's nests, we have designed an effective biomimetic hybrid strategy for creating an aerogel with ultrahigh strength and robust flame retardancy. The super-molecular micro-to nanofibrils formed by boric acid and melamine act as “twigs” while a small part of biobased polysaccharide agar serves as “glue”. Via the water as the solvent and an eco-friendly freeze-drying method, the obtained boric acid-melamine/agar (BMA) aerogel with a low density (0.0760 g/cm³) exhibited exceptional high compressive strength, reaching up to 3.92 MPa at 80 % strain. A piece of the BMA aerogel with 10 cm² can resist a motorcycle (150 kg) easily without any deformation. Additionally, the BMA aerogel demonstrated outstanding inherent flame retardant property (achieving UL-94 V-0 rating with relatively low the heat release, total heat release and CO release rate values) as well as superior thermal insulating properties (with a thermal conductivity as low as 0.0364 W/m⋅K). Given the distinctive mechanical properties and excellent other properties, the BMA aerogels hold great promise for potential promise in energy-saving and thermal protection applications. and the superior stiffness mechanism behind this performance is also analyzed.

气凝胶的机械性能仍然是其应用的关键问题。受鸟巢分层结构的启发，我们设计了一种有效的生物仿生混合策略，用于制造具有超高强度和强阻燃性能的气凝胶。由硼酸和三聚氰胺形成的超分子微纳米纤维充当 "树枝"，而一小部分生物基多糖琼脂则充当 "胶水"。以水为溶剂，采用环保的冷冻干燥方法，得到的硼酸-三聚氰胺-琼脂（BMA）气凝胶密度低（0.0760 g/cm3），抗压强度极高，80%应变时可达3.92兆帕。一块 10 平方厘米的 BMA 气凝胶可以轻松抵挡一辆重达 150 千克的摩托车而不发生任何变形。此外，BMA 气凝胶还具有出色的固有阻燃性能（达到 UL-94 V-0 级，热释放量、总热释放量和 CO 释放率值相对较低）和卓越的隔热性能（导热系数低至 0.0364 W/m⋅K）。由于 BMA 气凝胶具有独特的机械性能和优异的其他性能，因此在节能和热保护应用中大有可为。

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引用次数: 0

Ultra-high energy storage efficiency achieved through the construction of interlocking microstructure and excitation of depressor effects 通过构建互锁微结构和激发减压器效应实现超高储能效率

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-12 DOI: 10.1016/j.compositesb.2024.111943

Yuxin Hao , Yongping Pu , Jinbo Zhang , Haochen Xie , Xiang Lu , Qiao Pan , Lei Zhang , Bo Wang , Haoze Li

Glass-ceramic capacitors struggle to balance high energy storage efficiency (η>90 %) and sufficient breakdown field strength (E_b), hindering their use in energy storage. Interface polarization, caused by the accumulation of free charge, reduces breakdown strength. We prepared glass-ceramic materials with varying contents of the glass phase using traditional melting techniques, adjusting the glass content to enhance an interlocking structure between the glass and crystal phases, reducing Interface polarization. Divalent metal oxide BaO in the glass stimulated a depressor effect, filling gaps and increasing resistivity. The optimal composition (x = 0.2) achieved a 95 % energy storage efficiency and an energy storage density of 4.4 J/cm³ at 680 kV/cm, while x = 0.25 reached an ultra-high energy storage efficiency of 99 %. Increasing glass content reduced activation energy for Interface polarization (E_i) from 1.27 eV to 1.08 eV. Samples with x = 0.2 exhibited low dielectric loss (∼0.005), high dielectric constant (∼142), ultra-high power density (∼52.8 MW/cm³), and ultra-fast discharge speed (∼26 ns), suggesting future potential for high-performance glass-ceramic materials.

玻璃陶瓷电容器很难在高储能效率（η>90 %）和足够的击穿场强（Eb）之间取得平衡，这阻碍了它们在储能领域的应用。自由电荷积累造成的界面极化会降低击穿强度。我们采用传统的熔化技术制备了玻璃相含量不同的玻璃陶瓷材料，通过调整玻璃含量来增强玻璃相与晶体相之间的互锁结构，从而减少界面极化。玻璃中的二价金属氧化物 BaO 激发了压抑效应，填充了间隙并提高了电阻率。最佳成分（x = 0.2）的储能效率为 95%，680 kV/cm 时的储能密度为 4.4 J/cm3，而 x = 0.25 的超高储能效率为 99%。玻璃含量的增加使界面极化活化能（Ei）从 1.27 eV 降至 1.08 eV。x = 0.2 的样品表现出低介电损耗（∼0.005）、高介电常数（∼142）、超高功率密度（∼52.8 MW/cm3）和超快放电速度（∼26 ns），这表明高性能玻璃陶瓷材料未来大有可为。

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引用次数: 0

Nitrogen-doped porous carbon skeleton derived from glycine boosting superior rate capability and long lifespan for Na3V2(PO4)3 with high thermal safety 由甘氨酸衍生的掺氮多孔碳骨架可提高 Na3V2(PO4)3 的卓越速率能力和长寿命，并具有高热安全性

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-11-12 DOI: 10.1016/j.compositesb.2024.111977

Rui Du , Changcheng Liu , Que Huang , Baofeng Zhang , Hongyuan Ding , Jianghui Xie , Shengnan He , Yaxiong Yang , Chao Zheng , Yanjun Chen

Currently, the both low electronic and ionic conductivity have seriously hindered the further application of Na₃V₂(PO₄)₃ (NVP). Nevertheless, traditional carbon materials modification only improves the electronic conductive property, rather than modifying the ionic conductivity. Herein, N-rich carbon resources of glycine (GLY) is introduced to synthesize NVP, which can act as reducing agent and morphology inducer to optimize NVP sample. Notably, GLY supplies favorable N-doped carbon skeleton, and this defective carbon structure benefits for the accelerated electronic conductivity. Besides, porous construction is established after introducing GLY. This unique morphology significantly improves the infiltration effects of electrolyte, thus providing more electrochemical active sites for Na⁺ de-intercalation to improve the ionic conductivity. Meanwhile, porous framework supplies enough space for the shrinkage of crystal cells, so the stress-strain effect is highly restrained, which is demonstrated by Ex-situ XRD. The stabilized crystal and morphological structure of NVP@GLY-2 has been verified by after-cycled XRD/SEM/XPS. Highly improved kinetic characteristics are also investigated by In-situ EIS. Moreover, Accelerating Rate Calorimeter (ARC) measurements indicate that NVP@GLY-2-based half and full cells also have excellent thermal safety properties. Comprehensively, NVP@GLY-2 reveals a high capacity of 119 mAh g⁻¹ at 0.1 C. It reveals 84.5 and 71.2 mAh g⁻¹ at 10 and 50 C, with capacity retention rates of 88.9 % and 85.8 % after 1000 cycles.

目前，Na3V2(PO4)3（NVP）较低的电子导电性和离子导电性严重阻碍了其进一步应用。然而，传统的碳材料改性只能改善电子导电性能，而不能改变离子导电性。本文引入了富含 N 的甘氨酸（GLY）碳资源来合成 NVP，它可以作为还原剂和形态诱导剂来优化 NVP 样品。值得注意的是，GLY 提供了有利的掺杂 N 的碳骨架，这种有缺陷的碳结构有利于加速电子导电性。此外，引入 GLY 后，多孔结构得以形成。这种独特的形态大大提高了电解质的渗透效果，从而为 Na+ 脱闰提供了更多的电化学活性位点，从而提高了离子导电性。同时，多孔框架为晶胞的收缩提供了足够的空间，因此应力-应变效应得到了高度抑制，这一点在原位 XRD 中得到了证实。循环后 XRD/SEM/XPS 验证了 NVP@GLY-2 稳定的晶体和形态结构。原位 EIS 也研究了高度改进的动力学特性。此外，加速量热计（ARC）测量结果表明，基于 NVP@GLY-2 的半电池和全电池还具有出色的热安全特性。综合来看，NVP@GLY-2 在 0.1 摄氏度时具有 119 mAh g-1 的高容量，在 10 摄氏度和 50 摄氏度时分别为 84.5 mAh g-1 和 71.2 mAh g-1，循环 1000 次后容量保持率分别为 88.9% 和 85.8%。

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引用次数: 0