Inorganic Chemicals Industry ›› 2024, Vol. 56 ›› Issue (9): 44-53.doi: 10.19964/j.issn.1006-4990.2023-0575

• Research & Development • Previous Articles     Next Articles

Study on aluminum sol modified anode and cathode materials for lithium ion batteries

TIAN Peng1(), ZHANG Haoran1, XU Jingang1, MOU Chenxi1, XU Qianjin2, NING Guiling1   

  1. 1.School of Chemical Engineering,Dalian University of Technology,Dalian 116023,China
    2.Jiangxi Baohong Nano Technology Co.,Ltd.,Yichun 331208,China
  • Received:2023-11-30 Online:2024-09-10 Published:2024-02-18
  • Contact: TIAN Peng E-mail:tianpeng@dlut.edu.cn

Abstract:

With the development of electric vehicles and clean energy,higher requirements are put forward for the energy storage capacity and cycle life of lithium-ion batteries.In this paper,the positive electrode material of NCM811 and the negative electrode material of G/SiO were modified by alumina sol impregnation-coating method.Compared with the aluminum nitrate impregnation method,the amount of nitrogen oxides produced by thermal decomposition was reduced by more than 99%.Compared with the precipitation method,there were no by-products,the cost was lower than the organoaluminum salt method,and the uniformity was higher than the dry method,and it was easy to achieve scale.It was found that the addition of alumina sol did not affect the structure and charge and discharge mechanism of anode and cathode materials.The electrochemical performance test shows that the anode material NCM811 and cathode material G/SiO could obtain the best rate performance and cycle stability when the amount of alumina was 0.3% and 0.7%,respectively.Under 1C charge and discharge,the NCM811 and 0.3% alumina modified NCM811 were assembled into lithium-ion batteries with lithium sheets,and the cycles were 100 times,and the capacities were 123.55 mA·h/g and 151.02 mA·h/g,respectively.At 0.1C charge and discharge,the G/SiO cathode and 0.7% alumina modified cathode were assembled with lithium sheets to form a lithium-ion battery and then cycled for 45 times,with a capacity of 360.57 mA·h/g and 385.06 mA·h/g,respectively.

Key words: alumina sol, lithium-ion batteries, anode material, cathode material, surface modification

CLC Number: