Hwang Jongha, Jung Mincheol, Park Jin-Ju, Kim Eun-Kyung, Lee Gunoh, Lee Kyung Jin, Choi Jae-Hak, Song Woo-Jin
Department of Polymer Science and Engineering, Chungnam National University, Daejeon 34134, Korea.
Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Korea.
Nanomaterials (Basel). 2022 May 12;12(10):1649. doi: 10.3390/nano12101649.
Silicon-based electrodes are widely recognized as promising anodes for high-energy-density lithium-ion batteries (LIBs). Silicon is a representative anode material for next-generation LIBs due to its advantages of being an abundant resource and having a high theoretical capacity and a low electrochemical reduction potential. However, its huge volume change during the charge-discharge process and low electrical conductivity can be critical problems in its utilization as a practical anode material. In this study, we solved the problem of the large volume expansion of silicon anodes by using the carbon coating method with a low-cost phenolic resin that can be used to obtain high-performance LIBs. The surrounding carbon layers on the silicon surface were well made from a phenolic resin via a solvent-assisted wet coating process followed by carbonization. Consequently, the electrochemical performance of the carbon-coated silicon anode achieved a high specific capacity (3092 mA h g) and excellent capacity retention (~100% capacity retention after 50 cycles and even 64% capacity retention after 100 cycles at 0.05 C). This work provides a simple but effective strategy for the improvement of silicon-based anodes for high-performance LIBs.
硅基电极被广泛认为是用于高能量密度锂离子电池（LIBs）的有前景的阳极材料。硅是下一代LIBs的代表性阳极材料，因为它具有资源丰富、理论容量高和电化学还原电位低等优点。然而，其在充放电过程中的巨大体积变化和低电导率可能是其作为实际阳极材料应用中的关键问题。在本研究中，我们通过使用低成本酚醛树脂的碳涂层方法解决了硅阳极的大体积膨胀问题，该方法可用于获得高性能的LIBs。硅表面的周围碳层通过溶剂辅助湿涂层工艺，随后碳化，由酚醛树脂良好制成。因此，碳涂覆硅阳极的电化学性能实现了高比容量（3092 mA h g）和优异的容量保持率（在0.05 C下50次循环后容量保持率约为100%，甚至在100次循环后容量保持率为64%）。这项工作为改进用于高性能LIBs的硅基阳极提供了一种简单但有效的策略。
