Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 13, Pages 12594-12604Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b04050
Keywords
Ni-rich cathode; surfactant inductive agent; uniform surface coating; conductive polymer; excellent cyclability
Funding
- Basic Research Project of the Science and Technology Innovation Commission of Shenzhen [JCYJ20170412153139454]
- Guangdong Innovative and Entrepreneurial Research Team Program [2016ZT06G587]
- National Natural Science Foundation of China [21875097, 21671096]
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The Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode has attracted great interest owing to its low cost, high capacity, and energy density. Nevertheless, rapid capacity fading is a critical problem because of direct contact of NCM811 with electrolytes and hence restrains its wide applications. To prevent the direct contact, the surface inert layer coating becomes a feasible strategy to tackle this problem. However, to achieve a homogeneous surface coating is very challenging. Considering the bonding effect between NCM811, polyvinylpyrrolidone 20 BM 0 (PVP), and polyaniline (PANI), in this work, we use PVP as an inductive agent to controllably coat a uniform conductive PANI layer on NCM811 (NCM811@PANI-PVP). The coated PANT layer not only serves as a rapid channel for electron conduction, but also prohibits direct contact of the electrode with the electrolyte to effectively hinder side reaction. NCM811@PANI-PVP thus exhibits excellent cyclability (88.7% after 100 cycles at 200 mA g(-1)) and great rate performance (152 mA h g(-1) at 1000 mA In situ X-ray diffraction and in situ Raman are performed to investigate the charge-discharge mechanism and the cyclability of NCM811@PANI-PVP upon electrochemical reaction. This surfactant-modulated surface uniform coating strategy offers a new modification approach to stabilize Ni-rich cathode materials for lithium-ion batteries.
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