Ex-situ activation of Li-excess layered cathode materials for high-capacity lithium ion batteries

Document Type

Conference Proceeding

Publication Date

1-1-2014

Abstract

Ex-situ activation of Li-excess layered cathode materials has been carried out via two-step ion-exchanges and a post-annealing process, resulting in a complete phase conversion from a Li-excess layered Li[Li0.2Mn0.54Ni0.13Co0.13]O2 to a Li4Mn5O12-type spinel product. The newly-formed spinel material delivers an initial discharge capacity of 313.6 mAh/g at 0.1C (1C = 250 mA/g), much higher than 211.3 mAh/g from pristine Li-excess layered cathode. It can also retain a specific capacity of 197.5 mAh/g at 1C after 100 electrochemical cycles. The ion-exchange promoted phase transition contributes to remarkably improved rate capability and cycling stability of Li-excess layered cathode materials. This work sheds light on fundamental understanding of phase transitions within Li-excess layered oxides and provides a novel route for tailoring electrochemical performance of Li-excess layered cathode materials for high-capacity lithium ion batteries.

Publication Source (Journal or Book title)

ECS Transactions

First Page

77

Last Page

86

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