A low-cost silicon-graphite anode made from recycled graphite of spent lithium-ion batteries
A low-cost silicon-graphite anode made from recycled graphite of spent lithium-ion batteries
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DOI：
10.1016/j.jelechem.2021.115073
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发表时间：
2021-02-25
影响因子：
4.5
通讯作者：
Hu, Guorong
中科院分区：
文献类型：
--
作者：
Ruan, Dingshan;Wu, Lin;Hu, Guorong
从废旧锂离子电池中回收石墨对于保护环境和经济增长具有重要意义。硅-石墨复合材料已被广泛研究，有望在商业锂离子电池中替代石墨，但仍难以降低硅的体积膨胀。在本文中，我们发现废石墨是低成本生产高性能硅石墨复合材料的理想选择，因为处理后的废石墨（T-SGT）呈现出多孔结构，可以与硅良好结合并有效缓解体积膨胀。碳包硅处理的废石墨(T-SGT/Si@C)负极在300次循环后表现出良好的循环性能(容量保持率为92.47%)和良好的倍率性能(电流密度为500 mA g(-1)时为434.1 mAh g(-1)),远优于碳包硅商业石墨(CGT/Si@C)。
Recycling graphite from spent lithium-ion batteries has substantial significance in protection of environment as well as in growth of economic. Silicon-graphite composite materials have been extensively studied and expected to replace graphite in commercial lithium-ion batteries, but it is still difficult to reduce the volume expansion of silicon. In this paper, we find that spent graphite is an ideal choice for low cost production of high-performance silicon-graphite composite, because the treated spent graphite (T-SGT) presents a porous structure which can be well combined with silicon and effectively relieve the volume expansion. The carbon coated silicon-treated spent graphite (T-SGT/Si@C) anode exhibits good cycling performance (92.47% capacity retention) over 300 cycles and good rate property (434.1 mAh g(-1) at a current density of 500 mA g(-1)), much better than carbon coated silicon-commercial graphite (CGT/Si@C).