锂(药物)
锂离子电池
电化学
法拉第效率
离子
电解质
电池(电)
复合数
作者
Jiangmin Jiang,Ping Nie,Bing Ding,Wenxin Wu,Zhi Chang,Yuting Wu,Hui Dou,Xiaogang Zhang
标识
DOI:10.1021/acsami.6b10038
摘要
Interface design between current collector and electroactive materials plays a key role in the electrochemical process for lithium-ion batteries. Here, a thin graphene film has been successfully synthesized on the surface of Cu current collector by a large-scale low-pressure chemical vapor deposition (LPCVD) process. The modified Cu foil was used as a current collector to support spinel Li4Ti5O12 anode directly. Electrochemical test results demonstrated that graphene coating Cu foil could effectively improve overall Li storage performance of Li4Ti5O12 anode. Especially under high current rate (e.g., 10 C), the Li4Ti5O12 electrode using modified current collector maintained a favorable capacity, which is 32% higher than that electrode using bare current collector. In addition, cycling performance has been improved using the new type current collector. The enhanced performance can be attributed to the reduced internal resistance and improved charge transfer kinetics of graphene film by increasing electron c...
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