4 years ago

A Simple Pre-lithiation Strategy to Build High-Rate and Long-life Lithium-ion Battery with Improved Low-temperature Performance

Yongyao Xia, Xiaoli Dong, Bingchang Yang, Yonggang Wang, Yao Liu
Lithium-ion batteries (LIBs) are being used to power the commercial electric vehicles (EVs). However, the charge/discharge rate and life of current LIBs still cannot satisfy the further development of EVs. Furthermore, the poor low temperature performance of LIBs limits their application in cold climates and high altitude areas. Herein, a simple pre-lithiation method is developed to fabricate a new LIB. In this strategy, a Li3V2(PO4)3 cathode and a pristine hard carbon anode are used to form a primary cell, and the initial Li+ extraction from Li3V2(PO4)3 is used to pre-lithiate the hard carbon. Then, the self-formed Li2V2(PO4)3 cathode and pre-lithiated hard carbon anode are used to form a 4 V LIB. It is demonstrated that the LIB exhibits a maximum energy density of 208.3 Wh kg-1, a maximum power density of 8291 W kg-1 and a long-life of 2000 cycles. When operated at -40 oC, the LIB can keep 67 % capacity of room temperature, which is much better than conventional LIBs.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201710555

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