Preparation and electrochemical performance of a type 622 ternary cathode materials

doi:10.12028/j.issn.2095-4239.2018.0112

Abstract

Abstract: A 622-type ternary cathode materials (LNCM) was prepared by using molten salt made from a lithium salt based type-622 precursor, 0.24 Li₂CO₃-0.76 LiOH and potassium chloride in an air atmosphere. The effects of the ratio of lithium and potash, reaction time and reaction temperature on the crystal structure of the LNCM were investigated by XRD and SEM. The optimum preparation conditions were found to be from a lithium source to potassium salt ration of 1:5, a precursor to lithium source ratio of 1:1.1, a reaction temperature of 750℃, and a calcination time of 15 hours. LNCM as a cathode material was assembled into a button battery, and a number of electrochemical performance indexes were obtained, e.g. over the 2.7-4.3 V voltage range at 0.1 C rate, the specific capacity of the first discharge cycle was 182.5 mA·h/g, the Coulomb efficiency was 89.1%; over the 2.7-4.5 V voltage range at 0.1 C rate, the discharge specific capacity was 183.2 mA·h/g after 100 cycles, the capacity retention rate was found to be 91.5%.

Key words: 622 type precursor, LNCM, molten salt method, crystal structure, electrochemical performance

CLC Number:

TM911

XIA Zhimei, CHEN Hao, XIAO Li, LIU Pengcheng. Preparation and electrochemical performance of a type 622 ternary cathode materials[J]. Energy Storage Science and Technology, 2018, 7(5): 921-925.

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