Citation: LI Zhao, WANG Zhong, LI Qiang, BAN Li-Qing, ZHUANG Wei-Dong, LU Shi-Gang. A Strategy for Carbon Nanotubes Modified Lithium-Manganese-Rich Cathode Material[J]. Chinese Journal of Inorganic Chemistry, ;2019, 35(9): 1561-1569. doi: 10.11862/CJIC.2019.192 shu

A Strategy for Carbon Nanotubes Modified Lithium-Manganese-Rich Cathode Material

LI Zhao ^1,2 ,
WANG Zhong ^1,2,, ,
LI Qiang ^1,2 ,
BAN Li-Qing ^1,2 ,
ZHUANG Wei-Dong ^1,2 ,
LU Shi-Gang ^1,2

1.
General Research Institute for Nonferrous Metals, Beijing 100088, China
2.
China Automotive Battery Research Institute Co., Ltd., Beijing 100088, China

Corresponding author: WANG Zhong, wzwz99@126.com
Received Date: 14 May 2019
Revised Date: 11 June 2019

Figures(6)

Li_1.184[Ni_0.15Mn_0.516Co_0.15]O₂-modified carbon nanotubes network composite (CNT@LMR) cathode materials were synthesized by a novel strategy that adopted these technologies of compressed air crush, high pressure micro-fluidization dispersion and spray dehydration. The microstructures and morphologies were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffractometer (XRD) and Raman spectroscopy, which indicated that CNTs conductive network were uniformly distributed on the surface of lithium-manganese-rich (LMR) and existed between primary particles from LMR inside. The novel network structure built on Li-rich cathode material not only took advantage of CNTs as conductive additives, but also combined the characteristic of CNTs network acts as a surface modification layer. The electrochemical tests demonstrated that CNTs modified LMR electrode had higher rate capability and cycle stability. For example, CNT@LMR had discharge specific capacity of 141.4 mAh·g^-1 at 5C-rate, compared to the capacity of pristine LMR (76.6 mAh·g^-1) and composite LMR electrode with CNT conductive additives (110.7 mAh·g^-1). After 100 cycle tests at 1C-rate, the capacity retention of CNTs modified LMR was 87.2% compared to pristine LMR of 77.8%. According to electrochemical impedance spectroscopy (EIS) with different cycle tests, CNTs network structure on the surface of LMR improved electrode/electrolyte interface reaction, restrained solid electrolyte interphase (SEI) film growth and polarization of LMR electrode, and CNTs conductive network inside LMR reduced resistance and accelerated charge transfer process for primary particle.
- lithium-ion battery,
- lithium-manganese-rich material,
- carbon nanotubes,
- composite cathode,
- conductive network
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