Effect of micro carbon nanotubes coating on electrochemical properties of LiNi0.8Co0.1Mn0.1O2 cathode material

ZHANG Shu-xian; DENG Ling-feng; LIAN Xiao-hui; TAN Jie-hui; LI Jin-lei

doi:10.11868/j.issn.1001-4381.2019.000893

Cailiao gongcheng (May 2020)

Effect of micro carbon nanotubes coating on electrochemical properties of LiNi0.8Co0.1Mn0.1O2 cathode material

ZHANG Shu-xian,
DENG Ling-feng,
LIAN Xiao-hui,
TAN Jie-hui,
LI Jin-lei

Affiliations

ZHANG Shu-xian: School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;
DENG Ling-feng: School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;
LIAN Xiao-hui: School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;
TAN Jie-hui: School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;
LI Jin-lei: School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;

DOI: https://doi.org/10.11868/j.issn.1001-4381.2019.000893
Journal volume & issue: Vol. 48, no. 5
pp. 68 – 74

Abstract

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High nickel ternary cathode material LiNi0.8Co0.1Mn0.1O2 was prepared by high temperature sintering method, and the carbon nanotubes were treated in mixed acid. The single wall carbon nanotubes were obtained by centrifuging. Then dispersant (DMF)and LiNi0.8Co0.1Mn0.1O2 were mixed, and different amounts of carbon nanotubes were coated on the surface of LiNi0.8Co0.1Mn0.1O2by ultrasonic dispersion and spray drying method uniformly. CNTs/LiNi0.8Co0.1Mn0.1O2 composites were characterized and tested by SEM, XRD and electrochemical test system. The results show that the composite with 0.5%(mass fraction) carbon nanotubes has the best morphology and the best electrochemical performance. The first discharge specific capacities at different rates such as 0.1 C and 5 C are 215.587 mAh·g-1and 175.78 mAh·g-1, respectively. When charged at 0.1 C and discharged at a large rate of 5 C, the CNTs/LiNi0.8Co0.1Mn0.1O2 composites can still maintain the first discharge capacity of 81.54%, which is 10.48% higher than that of LiNi0.8Co0.1Mn0.1O2 which is not coated with carbon nanotubes. After 100 cycles at 1 C, the capacity retention rate is 93.02%, which is 15.42% higher than that of LiNi0.8Co0.1Mn0.1O2 which is not coated with carbon nanotubes.

Published in Cailiao gongcheng

ISSN: 1001-4381 (Print)
Publisher: Journal of Materials Engineering
Country of publisher: China
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: http://jme.biam.ac.cn/CN/1001-4381/home.shtml

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