用于高性能锂离子电池阳极的硅纳米颗粒双层涂层的协同效应

IF 5.4 Q2 CHEMISTRY, PHYSICAL Journal of Power Sources Advances Pub Date : 2024-11-21 DOI:10.1016/j.powera.2024.100163
Chaerin Gim , Hyokyeong Kang , Seungwon Lee , Gwangeon Oh , Shivam Kansara , Jang-Yeon Hwang
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引用次数: 0

摘要

硅因其超高的理论容量(3580 mAh g-1)和环境丰富性,已成为下一代锂离子电池(LIB)阳极的潜在候选材料。然而,硅阳极的实际应用受到了严重阻碍,因为其导电率低,而且在锂化-去锂化过程中体积膨胀率超过 300%,导致容量迅速下降。为了应对这些挑战,我们开发并成功应用了一种双层涂层策略,以同时增强硅纳米粒子(Si)的导电性和机械完整性。双镀膜层的设计具有内部导电通路和外部坚固覆盖,是通过在硅表面封装导电无定形碳层并镀上一层二氧化钛层(Si@C@TiO₂)来实现的。这些特性提高了电极在反复循环过程中的界面和结构稳定性。与 Si、碳包覆 Si(Si@C)和 TiO2 包覆 Si(Si@TiO2)阳极等未包覆和单一包覆的类似阳极相比,Si@C@TiO₂阳极表现出卓越的循环稳定性和发电能力。我们相信,这项研究为设计用于 LIB 的高性能硅基阳极带来了突破。
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Synergetic effect of double-layer coating on silicon nanoparticles for high-performance lithium-ion battery anodes
Silicon has emerged as a potential candidate for next-generation lithium-ion battery (LIB) anodes owing to its exceptionally high theoretical capacity (3580 mAh g−1) and environmental abundance. However, the practical application of Si anodes is severely hindered by low electrical conductivity and a substantial volume expansion rate of over 300 % during the lithiation–delithiation process, leading to rapid capacity degradation. To address these challenges, a double-layer coating strategy was developed and successfully applied to simultaneously enhance the electrical conductivity and mechanical integrity of Si nanoparticles (Si). The double coating layer was designed with an inside conductive pathway and outside robust coverage, which was achieved by encapsulating silicon with a conductive amorphous carbon layer on the silicon surface and coating it with a TiO2 layer (Si@C@TiO₂). These features improved the interfacial and structural stability of the electrodes during repeated cycling. Compared with its respective uncoated and single-coated analogous anodes, the Si, carbon-coated Si (Si@C), and TiO2-coated Si (Si@TiO2) anodes, the Si@C@TiO₂ anode demonstrates exceptional cycling stability and power capability. We believe that this study offers a breakthrough in the design of high-performance Si-based anodes for LIBs.
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来源期刊
CiteScore
9.10
自引率
0.00%
发文量
18
审稿时长
64 days
期刊最新文献
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