Si@Cu composite anode material prepared by magnetron sputtering for high-capacity lithium-ion batteries
Si@Cu composite anode material prepared by magnetron sputtering for high-capacity lithium-ion batteries
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DOI：
10.1016/j.ijhydene.2021.11.080
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发表时间：
2021-11
影响因子：
7.2
通讯作者：
Junying Zhang;Zhiguo Hou;Xiaoming Zhang;Chuanbo Li
中科院分区：
文献类型：
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作者：
Junying Zhang;Zhiguo Hou;Xiaoming Zhang;Chuanbo Li
本研究采用磁控溅射法制备了Si@Cu复合负极材料，并将其应用于锂离子电池。具有较高本征电导率的铜组分有助于有效地提高硅颗粒的电导率。与纳米颗粒相比，形状不规则的微米硅颗粒的团聚效应有所减弱。为了进一步缓解硅颗粒在充放电过程中的体积效应，进一步引入碳层，进一步提高了材料的导电性和循环性能。Si@Cu@C复合电极在100次循环后的可逆容量为1130mAhg−1，库仑效率为99.3%。Si@Cu和Si@Cu@C复合材料的制备方法都是批量生产的，这有利于它们的实际应用。此外，磁控溅射法制备复合粉末在制备微米级复合材料方面具有广阔的应用前景。
In this study, Si@Cu composite anode material is prepared by magnetron sputtering method and applied for lithium-ion batteries. The Cu component with higher intrinsic conductivity can help to improve the conductivity of the Si particles effectively. The irregularly shaped micro-sized Si particles have reduced agglomeration effect compared with nano-sized particles. In order to further relieve the volume effect of the Si particles during charging and discharging processes, carbon layer is further introduced, which will further boost the conductivity and the cyclic performance. The Si@Cu@C composite electrode exhibits a remarkably improved electrochemical performance with reversible capacity of 1130 mAhg−1after 100 cycles with coulombic efficiency of 99.3%. The methods used for the preparation of the Si@Cu and Si@Cu@C composite materials are both mass-productive, which is benefit for their practical applications. Moreover, magnetron sputtering method used for composite power preparation has broad application prospects in micro-sized composite material preparation.