Journal of Power Sources最新文献_第2页

Bisphosphate shell layer structure-decorated K0.45Rb0.05Mn0.85Mg0.15O2 cathode for boosting potassium/sodium storage 双磷酸盐壳层结构装饰的 K0.45Rb0.05Mn0.85Mg0.15O2 阴极，用于提高钾/钠储量

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-16 DOI: 10.1016/j.jpowsour.2024.235842

Yucong Chen , Xiaobo Chen , Dexun Liu , Yuyao Wu , Zhengying Wang , Francis Chi-Chun Ling , Lin Lan , Yao Cheng , Qiang Ru

Novel K_0.45Rb_0.05Mn_0.85Mg_0.15O₂ (KRMMO) cathode encapsulated by bisphosphate K₃PO₄/Mn₃PO₄ shell layer is delicately designed for boosting potassium/sodium storage. Benefiting from the bisphosphate layer, the volume expansion of KRMMO is effectively inhibited, K₃PO₄/MnPO₄ double-coated K_0.45Rb_0.05Mn_0.85Mg_0.15O₂ (D-KRMMO) has a high electronic conductivity and fast ionic diffusivity, which can stimulate potassium/sodium storage. Meanwhile, bisphosphate K₃PO₄/Mn₃PO₄ shell directly isolates the cathode from the electrolyte to alleviate side reactions occurring between the electrolyte and the material, thus the dissolution of Mn in KRMMO host can be inhibited during the cycling process. In potassium ion batteries (PIBs), the discharge specific capacity of D-KRMMO is 105.9 mAh g⁻¹ at a current density of 20 mA g⁻¹ compared with pure KRMMO (94 mAh g⁻¹ at 20 mA g⁻¹). A highly reversible discharge specific capacity of 112.8 mAh g⁻¹ at 100 mA g⁻¹ is shown in the sodium-ion batteries (SIBs). And acceptable C-rate performances of 112.8 mAh g⁻¹ and 44.8 mAh g⁻¹ are exhibited at 100 mA g⁻¹ and 2 A g⁻¹, respectively. EIS and GITT measurements have shown that D-KRMMO cathode has faster ion mobility and electron mobility, as well as higher pseudocapacitance contribution.

新型 K0.45Rb0.05Mn0.85Mg0.15O2（KRMMO）阴极由双磷酸盐 K3PO4/Mn3PO4 壳层封装，设计精巧，可提高钾/钠储量。得益于双磷酸盐层有效抑制了 KRMMO 的体积膨胀，K3PO4/MnPO4 双涂层 K0.45Rb0.05Mn0.85Mg0.15O2 （D-KRMMO）具有高电子传导性和快速离子扩散性，可促进钾/钠储存。同时，双磷酸盐 K3PO4/Mn3PO4 外壳直接将阴极与电解质隔离，减轻了电解质与材料之间发生的副反应，从而在循环过程中抑制了 KRMMO 主体中锰的溶解。在钾离子电池（PIBs）中，与纯 KRMMO（在 20 mA g-1 电流密度下为 94 mAh g-1）相比，D-KRMMO 在 20 mA g-1 电流密度下的放电比容量为 105.9 mAh g-1。在钠离子电池（SIBs）中，100 mA g-1 时的高可逆放电比容量为 112.8 mAh g-1。在 100 mA g-1 和 2 A g-1 条件下，C 率分别为 112.8 mAh g-1 和 44.8 mAh g-1。EIS 和 GITT 测量结果表明，D-KRMMO 阴极具有更快的离子迁移率和电子迁移率，以及更高的假电容贡献率。

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引用次数: 0

Three-dimensional numerical simulation of counter gas transport in porous anodes of solid oxide fuel cells 固体氧化物燃料电池多孔阳极中反气体传输的三维数值模拟

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-16 DOI: 10.1016/j.jpowsour.2024.235766

Kohei Yamazaki, Masashi Kishimoto, Hiroshi Iwai

The counter gas transport of hydrogen and steam in solid oxide fuel cell anodes is numerically investigated to clarify the local behavior of gases and the effect of pore structure on the gas transport. The three-dimensional analysis simulating equimolar counter transport of hydrogen and steam revealed that diffusion is dominant in fine pores, while convection is dominant in larger pores. It is also clarified that hydrogen is primarily transported in fine pores, while steam is primarily transported in larger pores at equimolar gas transport. The hydrogen transport in large pores significantly decreases as the gas concentration gradient decreases, and this suggests the importance of diffusional property at lower gas concentration gradients. On the other hand, changes in the gas concentration gradient have little effect on the correlation between steam transport and pore size. Additionally, the dependence on the gas concentration gradient becomes more pronounced with larger pore-structural scales.

对固体氧化物燃料电池阳极中氢气和蒸汽的逆向气体传输进行了数值研究，以阐明气体的局部行为以及孔隙结构对气体传输的影响。模拟氢气和蒸汽等摩尔逆向传输的三维分析表明，细孔中主要是扩散，而大孔隙中主要是对流。这也说明，在气体等摩尔迁移时，氢主要在细孔中迁移，而蒸汽主要在大孔隙中迁移。随着气体浓度梯度的降低，氢气在大孔隙中的迁移量明显减少，这表明在气体浓度梯度较低时扩散特性的重要性。另一方面，气体浓度梯度的变化对蒸汽传输与孔隙大小之间的相关性影响不大。此外，孔隙结构尺度越大，对气体浓度梯度的依赖性就越明显。

引用次数: 0

A layer-structured high entropy oxide with highly reversible Fe3+/Fe4+ redox as advanced cathode material for sodium ion batteries 一种具有高度可逆 Fe3+/Fe4+ 氧化还原作用的层状结构高熵氧化物，可作为钠离子电池的先进阴极材料

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-16 DOI: 10.1016/j.jpowsour.2024.235735

Jili Yue , Feng Xiong , Zulipiya Shadike , Xiangwen Gao , Jun Chen , Liquan Pi , Yi Yuan , Baihua Qu , Paul Adamson , Lu Ma , Qian Li , Peter G. Bruce

Reversible redox center is essential for long-life electrode materials. Iron is an earth abundant element, in lithium-ion batteries, highly reversible Fe²⁺/Fe³⁺ redox in LiFePO₄ has play important role as redox center, Fe³⁺/Fe⁴⁺ redox in lithium layer-structured oxides display poor electrochemical performance. In sodium ion batteries, Fe³⁺/Fe⁴⁺ redox in sodium layer-structured oxides are active, while the cycle performance of Fe-contained sodium layer-structured oxide cathode need to be further improved. Herein, A pure-phase layer-structured high entropy oxide O3-Na(MgCu)_1/12(NiCoFeMnTi)_1/6O₂ is synthesized and investigated as cathode for sodium ion battery. A reversible phase-transition takes place during the charge/discharge process. Particularly, highly reversible Fe³⁺/Fe⁴⁺ redox is revealed by X-ray absorption fine structure (XAFS). The as-synthesized high entropy oxide delivers a discharge capacity of 146.6 mAh g⁻¹ at 10 mA g⁻¹, and can retain 83.2 % of capacity after 700 cycles at 100 mA g⁻¹ between 2.0 and 4.1 V vs. Na⁺/Na. In this work, Fe K-edge of Fe³⁺/Fe⁴⁺ redox displays rigid shift, HEO-MgCuNi could be a platform to investigate the fundamental property of Fe³⁺/Fe⁴⁺ redox.

可逆氧化还原中心对长寿命电极材料至关重要。铁是地球上丰富的元素，在锂离子电池中，LiFePO4 中高度可逆的 Fe2+/Fe3+ 氧化还原作为氧化还原中心发挥着重要作用，而锂层结构氧化物中的 Fe3+/Fe4+ 氧化还原则显示出较差的电化学性能。在钠离子电池中，钠层结构氧化物中的 Fe3+/Fe4+ 氧化还原作用活跃，而含铁钠层结构氧化物正极的循环性能有待进一步提高。本文合成了一种纯相层结构高熵氧化物 O3-Na(MgCu)1/12(NiCoFeMnTi)1/6O2，并将其作为钠离子电池正极进行了研究。在充放电过程中发生了可逆相变。特别是，X 射线吸收精细结构（XAFS）揭示了高度可逆的 Fe3+/Fe4+ 氧化还原。合成的高熵氧化物在 10 mA g-1 下的放电容量为 146.6 mAh g-1，并且在 2.0 至 4.1 V 之间以 100 mA g-1 对 Na+/Na 进行 700 次循环后仍能保持 83.2% 的容量。在这项工作中，Fe3+/Fe4+ 氧化还原的 Fe K 边出现了刚性位移，HEO-MgCuNi 可作为研究 Fe3+/Fe4+ 氧化还原基本特性的平台。

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引用次数: 0

Research progress on rechargeable aluminum sulfur (Al-S) batteries based on different electrolyte systems 基于不同电解质体系的可充电铝硫（Al-S）电池的研究进展

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-16 DOI: 10.1016/j.jpowsour.2024.235837

Xiaogeng Huo , Yi Zhao , Shuaitao Zhang , Wenhao Li , Han Li , Zhanyu Li , Jianling Li

Metal aluminum is inexpensive, pollution-free, safe to use, and abundant in resources. It has great potential in electrochemical energy storage, with a theoretical specific capacity of up to 2980 mAh g⁻¹. Sulfur not only has the advantages of abundant raw materials and low prices, but also has a theoretical capacity of 1675 mAh g⁻¹. The theoretical energy density of Al-S batteries can reach up to 1340 Wh kg⁻¹ when matched with metallic aluminum. However, the current research on Al-S batteries is still in its early stages, and the impact of differences in electrolyte systems on the electrochemical performance and working mechanism of Al-S batteries is not yet clear. The research on the electrochemical reaction mechanism, capacity degradation mechanism, and strategies to improve charge transfer kinetics of aluminum sulfur batteries is crucial for improving their electrochemical performance. From this perspective, this paper comprehensively summarizes the electrochemical performance, charging/discharging mechanisms, and battery level cost advantages of Al-S batteries with different electrolyte systems. The influence of the phase transition process of S and the shuttle effect of polysulfides on the electrochemical performance of Al-S batteries is elucidated based on different electrolyte systems. In addition, in response to the key issues currently existing in Al-S batteries, the next research directions are summarized and prospected.

金属铝价格低廉、无污染、使用安全、资源丰富。它在电化学储能方面潜力巨大，理论比容量高达 2980 mAh g-1。硫不仅具有原料丰富、价格低廉的优势，而且理论比容量为 1675 mAh g-1。如果与金属铝搭配，铝-S 电池的理论能量密度可达 1340 Wh kg-1。然而，目前对 Al-S 电池的研究仍处于早期阶段，电解质体系的差异对 Al-S 电池电化学性能和工作机理的影响尚不明确。研究铝硫电池的电化学反应机理、容量衰减机理以及改善电荷转移动力学的策略，对于提高铝硫电池的电化学性能至关重要。从这个角度出发，本文全面总结了不同电解质体系的铝硫电池的电化学性能、充放电机理和电池级成本优势。根据不同的电解质体系，阐明了 S 的相变过程和多硫化物的穿梭效应对 Al-S 电池电化学性能的影响。此外，针对铝-S 电池目前存在的关键问题，总结并展望了下一步的研究方向。

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引用次数: 0

Characterization of cathode degradation and development of a coupled electrochemical-aging model for sulfide-based all-solid-state batteries 硫化物全固态电池的阴极降解特征和电化学-老化耦合模型的开发

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-15 DOI: 10.1016/j.jpowsour.2024.235830

Dexin Huo , Guoliang Li , Guodong Fan , Xi Zhang , Jingbo Han , Yansong Wang , Boru Zhou , Shun Chen , Linan Jia

With the rapid advancement of the electric vehicle industry, traditional lithium-ion batteries with organic liquid electrolytes are increasingly falling short of meeting the demanding standards for energy density and safety. All-solid-state batteries, characterized by their high safety and energy density, are considered the next generation of battery technologies. Among these, sulfide solid-state electrolytes have garnered significant attention due to their high ionic conductivity and excellent processability. However, the aging mechanisms of sulfide-based all-solid-state batteries remain inadequately studied, and the development of aging models for these systems is still in its early stages. This paper primarily investigates the aging mechanisms of the cathode of a sulfide-based all-solid-state battery through various characterization techniques and establishes a coupled electrochemical-aging model correspondingly. Additionally, it emphasizes the often-overlooked role of sulfide electrolyte cracking in the composite cathode as a contributor to the loss of active material. The proposed model demonstrates high accuracy in estimating the state of health of the battery during cyclic aging, offering a new approach to the aging modeling of all-solid-state batteries.

随着电动汽车行业的快速发展，传统的有机液态电解质锂离子电池越来越无法满足能量密度和安全性的苛刻标准。以高安全性和能量密度为特点的全固态电池被认为是下一代电池技术。其中，硫化物固态电解质因其高离子传导性和出色的可加工性而备受关注。然而，人们对硫化物全固态电池的老化机理研究仍然不足，这些系统的老化模型的开发仍处于早期阶段。本文主要通过各种表征技术研究硫化物全固态电池阴极的老化机理，并相应地建立了电化学-老化耦合模型。此外，它还强调了经常被忽视的复合阴极中硫化物电解质裂解对活性材料损耗所起的作用。所提出的模型在估计循环老化过程中电池的健康状况方面具有很高的准确性，为全固态电池的老化建模提供了一种新方法。

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引用次数: 0

A yarn-ball-shaped graphene microsphere-coated separator design for enhanced electrochemical performance in Li-S batteries 纱球状石墨烯微球涂层隔膜设计可提高锂-S 电池的电化学性能

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-15 DOI: 10.1016/j.jpowsour.2024.235828

Thi Ai Ngoc Bui , Yu-Sheng Su

Lithium-sulfur batteries (LSBs) present a promising alternative to conventional lithium-ion (Li-ion) batteries due to their high energy density and theoretical capacity. However, their practical application is hindered by issues such as poor sulfur utilization, highly soluble lithium polysulfides (LiPSs), and rapid capacity decay. This study introduces an innovative cell configuration using a separator coated with reduced graphene oxide/carbon nanotube (rGO/CNT) microspheres. The rGO/CNT-coated separator aims to enhance electron transfer, confine LiPSs within the cathode region, and mitigate their migration to the anode. In particular, the LSB cell with an rGO/CNT-modified separator delivers an impressive initial capacity of 1482 mAh g⁻¹ and demonstrates a low capacity decay rate of 0.09% per cycle. The highly conductive rGO/CNT-coated separator enhances active material utilization even at high rates, resulting in a significant capacity of 824 mAh g⁻¹ at 4C. Furthermore, the rGO/CNT-modified separator shows an impressive capacity of 895 mAh g⁻¹ under high sulfur loading of 4.8 mg cm⁻² with long-term cycling performance. The results demonstrate that the rGO/CNT-coated separator significantly enhances sulfur reutilization, reduces capacity decay, and improves the electrochemical stability of LSBs. This configuration simplifies the manufacturing process and offers a viable solution for the practical application of LSBs.

锂硫电池（LSB）具有高能量密度和理论容量，是传统锂离子（Li-ion）电池的理想替代品。然而，硫利用率低、多硫化锂（LiPSs）溶解度高以及容量衰减快等问题阻碍了它们的实际应用。本研究介绍了一种创新的电池配置，即使用涂有还原氧化石墨烯/碳纳米管（rGO/CNT）微球的隔板。涂有还原氧化石墨烯/碳纳米管的分离器旨在增强电子传递，将锂离子电池限制在阴极区域内，并减少其向阳极的迁移。特别是，采用 rGO/CNT 改性隔膜的 LSB 电池的初始容量高达 1482 mAh g-1，而且容量衰减率低，每个周期仅为 0.09%。高导电性的 rGO/CNT 涂层隔膜即使在高速率下也能提高活性材料的利用率，从而在 4C 时产生 824 mAh g-1 的显著容量。此外，在 4.8 mg cm-2 的高硫负荷下，rGO/CNT 改性隔膜显示出 895 mAh g-1 的惊人容量和长期循环性能。结果表明，rGO/CNT 涂层隔膜可显著提高硫的再利用率，减少容量衰减，并改善 LSB 的电化学稳定性。这种配置简化了制造工艺，为 LSB 的实际应用提供了可行的解决方案。

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引用次数: 0

Unveiling the influences of electrolyte additives on the fast-charging performance of lithium-ion batteries 揭示电解质添加剂对锂离子电池快速充电性能的影响

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-15 DOI: 10.1016/j.jpowsour.2024.235844

Rachel Schmidt, Chen Liu, Zehao Cui, Arumugam Manthiram

Enhancing the fast-charging capability of lithium-ion batteries is a promising way to extend the driving range of electric vehicles. One of the most effective and economic ways is to regulate the electrode-electrolyte interphase chemistry by employing electrolyte additives. This requires a comprehensive understanding of the intrinsic role and effectiveness of different electrolyte additives. In this work, five common electrolyte additives are comprehensively compared in graphite | LiNi_0.8Mn_0.1Co_0.1O₂ lithium-ion cells, including lithium difluorophosphate (PFO), lithium bis(oxalato)borate (LiBOB), lithium difluoro (oxalato)borate (DFOB), tris(trimethylsilyl) phosphite (TMSPi), and tris(trimethylsilyl) phosphate (TMSPA). Although all of them are found to improve fast-charging performance over the baseline electrolyte, comprehensive analyses show that DFOB and TMSPi are the most effective additives, which results from their capability of ameliorating the electrode-electrolyte interphases at both the cathode and anode. This is confirmed with X-ray photoelectron spectroscopy and comprehensive electrochemical characterizations. In contrast, LiBOB and PFO can stabilize the cathode well, but make the anode-electrolyte interphase more resistive. Overall, this research expands the understanding of the role of electrolyte additives in fast-charging lithium-ion batteries.

提高锂离子电池的快速充电能力是延长电动汽车行驶里程的一种可行方法。最有效、最经济的方法之一是通过使用电解质添加剂来调节电解质-电解质相间化学。这就需要全面了解不同电解质添加剂的内在作用和功效。本研究全面比较了五种常用电解质添加剂在石墨 | LiNi0.8Mn0.1Co0.1O2锂离子电池中的应用进行了综合比较，包括二氟磷酸锂（PFO）、双（草酸）硼酸锂（LiBOB）、二氟（草酸）硼酸锂（DFOB）、三（三甲基硅基）亚磷酸酯（TMSPi）和三（三甲基硅基）磷酸酯（TMSPA）。虽然与基线电解质相比，所有这些添加剂都能改善快速充电性能，但综合分析表明，DFOB 和 TMSPi 是最有效的添加剂，这是因为它们能改善阴极和阳极的电极-电解质相间。X 射线光电子能谱和全面的电化学特性分析证实了这一点。相比之下，LiBOB 和 PFO 能够很好地稳定阴极，但却使阳极-电解质相间更具电阻性。总之，这项研究拓展了人们对电解质添加剂在快速充电锂离子电池中作用的认识。

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引用次数: 0

Fast equalization of lithium battery energy storage system based on large-scale global optimization 基于大规模全局优化的锂电池储能系统快速均衡

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-15 DOI: 10.1016/j.jpowsour.2024.235783

Qing An, Yaqiong Li, Xia Zhang, Lang Rao

The growing emergence of electric vehicles brings the problem of retired lithium-ion batteries (LiB) proliferation, so the retired LiB with different state-of-health (SOH) values are urgent to be employed for the second-life application. Due to the Matthew's effect caused by SOH difference, effective SOH equalization is required to achieve stable performance. In this study, the SOH equalization for large LiB system is established as large-scale global optimization problem, and the model predictive control (MPC) is introduced to control the depth of discharge (DOD) dynamically. In order to overcome the “curse of dimensionality” problem, a novel algorithm namely GA_LSE is proposed, in which the solution space segmentation and reorganization mechanism, and the improved selection, crossover and mutation operations are introduced to dispatch the power flows to achieve fast equalization speed. Experimental results show that with the utilization of GA_LSE algorithm, the high-dimensional equalization model with up to 1000 variables can be effectively optimized, the convergence speed and accuracy are significantly better than that of the state-of-the-art algorithms. In addition, when the GA_LSE algorithm is further integrated with MPC-based DOD control mechanism, the SOH values of large retired LiB packs can be effectively equalized with high accuracy and fast response speed.

电动汽车的日益兴起带来了退役锂离子电池（LiB）激增的问题，因此具有不同健康状态（SOH）值的退役锂离子电池急需用于二次生命应用。由于 SOH 值不同会产生马太效应，因此需要对 SOH 值进行有效均衡，以实现稳定的性能。本研究将大型锂电池系统的 SOH 均衡作为大规模全局优化问题，并引入模型预测控制（MPC）来动态控制放电深度（DOD）。为了克服 "维度诅咒 "问题，提出了一种新的算法，即 GALSE 算法，其中引入了解空间分割和重组机制，以及改进的选择、交叉和变异操作来调度功率流，从而实现快速均衡。实验结果表明，利用 GALSE 算法可以有效优化多达 1000 个变量的高维均衡模型，其收敛速度和精度明显优于最先进的算法。此外，当 GALSE 算法进一步与基于 MPC 的 DOD 控制机制相结合时，可有效均衡大型退役锂电池组的 SOH 值，且精度高、响应速度快。

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引用次数: 0

Investigate the symmetrical electrode material based on Pr and Ni doping SmBaFe2O5+δ for its electrochemical and stability performance for solid oxide cell 研究基于掺杂 Pr 和 Ni 的 SmBaFe2O5+δ 对称电极材料在固体氧化物电池中的电化学和稳定性能

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-15 DOI: 10.1016/j.jpowsour.2024.235806

Yunfei Li , Dong Guo , Aoye Li , Dongchao Qiu , Bingbing Niu , Biao Wang

Symmetrical solid oxide cell (SSOC) that uses the same electrode material for both oxygen electrode and fuel electrode can simplify the preparation process and enhance the durability of the cell. In this study, the Pr and Ni doped SmBaFe₂O_5+δ (SBF), Sm_0.9Pr_0.1BaFe₂O_5+δ (SPBF91) and Sm_0.9Pr_0.1BaFe_1.6Ni_0.4O_5+δ (SPBFN) as symmetrical electrodes for SSOC are successfully prepared, and their properties are investigated. First principles calculation indicates that the oxygen vacancy formation energy of SPBF91 (2.24 eV), SPBFN (1.76 eV) is lower than that of SBF (2.49 eV). In addition, the doping of Pr and Ni significantly reduces the band center energy of Fe-3d and O-2p in SPBFN, which is conducive to oxygen ion and charge transfer. At 800 °C, the polarization resistance of SPBFN are 0.025 Ωcm², and 0.11 Ωcm² in air and H₂, respectively. At 800 °C, using H₂, CH₃OH, and wet C₃H₈ as fuel, the maximum power density (MPD) of fuel cell with SPBFN as a symmetrical electrode reaches 850, 651 and 648 mWcm⁻², respectively. The FeNi alloy is observed on the SPBFN surface at fuel electrode side. The FeNi alloy on SPBFN surface significantly improves the output performance and stability of symmetrical electrode. Furthermore, the solid oxide electrolysis cell (SOEC) with PBSFN as a symmetrical electrode exhibits good stability during a 200 h test when electrolyzing H₂-50%H₂O and electrolysis CO₂.

对称固态氧化物电池（SSOC）的氧电极和燃料电极使用相同的电极材料，可简化制备过程并提高电池的耐用性。本研究成功制备了掺杂 Pr 和 Ni 的 SmBaFe2O5+δ (SBF)、Sm0.9Pr0.1BaFe2O5+δ (SPBF91) 和 Sm0.9Pr0.1BaFe1.6Ni0.4O5+δ (SPBFN)，并对其性能进行了研究。第一性原理计算表明，SPBF91（2.24 eV）和 SPBFN（1.76 eV）的氧空位形成能低于 SBF（2.49 eV）。此外，Pr 和 Ni 的掺杂大大降低了 SPBFN 中 Fe-3d 和 O-2p 的能带中心能，有利于氧离子和电荷转移。在 800 ℃ 时，SPBFN 在空气和 H2 中的极化电阻分别为 0.025 Ωcm2 和 0.11 Ωcm2。在 800 ℃ 条件下，以 H2、CH3OH 和湿 C3H8 为燃料，以 SPBFN 为对称电极的燃料电池的最大功率密度（MPD）分别达到 850、651 和 648 mWcm-2。在燃料电极一侧的 SPBFN 表面可以观察到铁镍合金。SPBFN 表面的铁镍合金显著提高了对称电极的输出性能和稳定性。此外，以 PBSFN 为对称电极的固体氧化物电解池（SOEC）在电解 H2-50%H2O 和电解 CO2 的 200 小时试验中表现出良好的稳定性。

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引用次数: 0

Enhancing high-density battery performance through innovative single-phase spray technology in immersion cooling systems 通过浸入式冷却系统中的创新单相喷雾技术提高高密度电池性能

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-15 DOI: 10.1016/j.jpowsour.2024.235770

Hong Shi , Zhuo Zeng , Benben Kong , Nenglin Yuan

The flow field organization in liquid-cooled BTMS (Battery Thermal Management System) is crucial to the thermal performance of lithium-ion batteries. This study introduces an innovative single-phase spray technology to optimize the flow field and enhance thermal characteristics in BTMS. Using Computational Fluid Dynamics simulations, key factors such as dielectric fluid type, nozzle diameter, spray angle, and nozzle position are analyzed. Novec 7500 is identified as the optimal dielectric fluid, with thermal conductivity and viscosity playing significant roles. Response Surface Analysis and the entropy weight TOPSIS (Technique for Order of Preference by Similarity to the Ideal Solution) determine optimal conditions: a 0.47 mm nozzle diameter, 0 mm nozzle offset, and an 88.16° spray angle. These parameters reduce the maximum battery temperature to 25.43 °C and minimize the temperature gradient to 3.41 °C, achieving reductions of 14.20 % and 57.74 %, respectively, compared to non-spray systems. Furthermore, the system reduces the maximum temperature of a 36-cell battery module by 27.28 % to 25.33 °C and the maximum temperature difference by 69.39 % to 4.35 °C. The optimized spray cooling technology is effective for smaller battery stacks and demonstrates the potential to maintain high cooling efficiency in complex systems, providing a solution for BTMS.

液冷电池热管理系统（BTMS）中的流场组织对锂离子电池的热性能至关重要。本研究介绍了一种创新的单相喷雾技术，以优化流场并增强 BTMS 的热特性。通过计算流体动力学模拟，对介质流体类型、喷嘴直径、喷射角度和喷嘴位置等关键因素进行了分析。Novec 7500 被确定为最佳介电流体，热导率和粘度也发挥了重要作用。响应面分析法和熵权 TOPSIS（通过与理想解决方案相似度排序的技术）确定了最佳条件：0.47 毫米的喷嘴直径、0 毫米的喷嘴偏移和 88.16° 的喷射角。与非喷雾系统相比，这些参数将电池的最高温度降低到 25.43 °C，将温度梯度最小化到 3.41 °C，分别降低了 14.20 % 和 57.74 %。此外，该系统还将 36 芯电池模块的最高温度降低了 27.28% 至 25.33 °C，最大温差降低了 69.39% 至 4.35 °C。优化的喷雾冷却技术对较小的电池堆也很有效，并证明了在复杂系统中保持高冷却效率的潜力，为 BTMS 提供了一种解决方案。

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引用次数: 0