A stable lithium-rich surface structure for lithium-rich layered cathode materials

Sangryun Kim, Woosuk Cho, Xiaobin Zhang, Yoshifumi Oshima () and Jang Wook Choi ()
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Sangryun Kim: Graduate School of Energy, Environment, Water, and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST)
Woosuk Cho: Advanced Batteries Research Center, Korea Electronics Technology Institute (KETI)
Xiaobin Zhang: School of Materials Science I, Japan Advanced Institute of Science and Technology (JAIST)
Yoshifumi Oshima: School of Materials Science I, Japan Advanced Institute of Science and Technology (JAIST)
Jang Wook Choi: Graduate School of Energy, Environment, Water, and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST)

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract Lithium ion batteries are encountering ever-growing demand for further increases in energy density. Li-rich layered oxides are considered a feasible solution to meet this demand because their specific capacities often surpass 200 mAh g−1 due to the additional lithium occupation in the transition metal layers. However, this lithium arrangement, in turn, triggers cation mixing with the transition metals, causing phase transitions during cycling and loss of reversible capacity. Here we report a Li-rich layered surface bearing a consistent framework with the host, in which nickel is regularly arranged between the transition metal layers. This surface structure mitigates unwanted phase transitions, improving the cycling stability. This surface modification enables a reversible capacity of 218.3 mAh g−1 at 1C (250 mA g−1) with improved cycle retention (94.1% after 100 cycles). The present surface design can be applied to various battery electrodes that suffer from structural degradations propagating from the surface.

Date: 2016
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DOI: 10.1038/ncomms13598

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