Lin Yangfan, Lin Hanqing, Jiang Jingwei, Yang Deren, Du Ning, He Xueqin, Ren Jianguo, He Peng, Pang Chunlei, Xiao Chengmao
State Key Lab of Silicon Materials, School of Materials Science and Engineering, Zhejiang University Hangzhou 310027 People's Republic of China
BTR New Energy Materials Inc Shenzhen 518106 P. R. China.
RSC Adv. 2019 Nov 1;9(61):35392-35400. doi: 10.1039/c9ra06576h. eCollection 2019 Oct 31.
Silicon is regarded as the next generation anode material for lithium-ion batteries because of its high specific capacity, low intercalation potential and abundant reserves. However, huge volume changes during the lithiation and delithiation processes and low electrical conductivity obstruct the practical applications of silicon anodes. In this study, a treble-shelled porous silicon (TS-P-Si) structure was synthesized a three-step approach. The TS-P-Si anode delivered a capacity of 858.94 mA h g and a capacity retention of 87.8% (753.99 mA h g) after being subjected to 400 cycles at a current density of 400 mA g. The good cycling performance was due to the unique structure of the inner silicon oxide layer, middle silver nano-particle layer and outer carbon layer, leading to a good conductivity and a decreased volume change of this silicon-based anode.
由于硅具有高比容量、低嵌入电位和丰富储量，它被视为下一代锂离子电池负极材料。然而，在锂化和脱锂过程中巨大的体积变化以及低电导率阻碍了硅负极的实际应用。在本研究中，采用三步法合成了一种三壳层多孔硅（TS-P-Si）结构。TS-P-Si负极在400 mA g的电流密度下进行400次循环后，容量为858.94 mA h g，容量保持率为87.8%（753.99 mA h g）。良好的循环性能归因于内部氧化硅层、中间银纳米颗粒层和外部碳层的独特结构，这使得这种硅基负极具有良好的导电性并减少了体积变化。
