New Insights for the Abuse Tolerance Behavior of LiMn2O4 under High Cut-Off Potential Conditions

被引:18
作者
Zhang, Feilong [1 ]
Geng, Tongtong [1 ]
Peng, Fengfeng [1 ]
Zhao, Dongni [1 ,2 ]
Zhang, Ningshuang [1 ,2 ]
Zhang, Haiming [2 ]
Li, Shiyou [1 ,2 ]
机构
[1] Lanzhou Univ Technol, Coll Petrochem Technol, Lanzhou 730050, Gansu, Peoples R China
[2] Qinghai Green Grass New Energy Technol Co Ltd, Qinghai Res Ctr Low Temp Lithium Ion Battery Tech, Xining 810000, Qinghai, Peoples R China
关键词
capacity fade mechanism; cut-off potential; diffusion coefficient; impedance analysis; LiMn2O4; LITHIUM-ION BATTERIES; TRANSITION-METAL DISSOLUTION; HIGH-POWER DENSITY; ELECTROCHEMICAL PERFORMANCE; MANGANESE-DIOXIDE; CAPACITY; CATHODE; ELECTROLYTE; VOLTAGE; INTERFACE;
D O I
10.1002/celc.201801448
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The further development of lithium-ion batteries is often desired to obtain higher capacities by charging to higher potentials. However, such a high potential (>4.3 V) will inevitably result in capacity loss of the LiMn2O4 cathode material over numerous cycles. In this work, degradation mechanisms of LiMn2O4 electrode cycled at different charge cut-off potentials (4.4, 4.5, 4.6, 4.7, and 4.8 V vs. Li/Li+, respectively) have been investigated. It is found that the capacity degraded seriously after aging cycles at the cut-off potentials (<4.6 V), especially at 4.4 V. Remarkably, a thicker cathode-electrolyte interface (CEI) film on the cathode surface can be observed when the potential reached 4.7 and 4.8 V. Thus, two degradation mechanisms are proposed, which are also verified by the calculation of the diffusion coefficient of Li+ ions (D-Li(+)). This work demonstrates the relationship between the capacity fade and cut-off potentials and provides a useful guidance for other cathode materials with high-voltage operation.
引用
收藏
页码:731 / 740
页数:10
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