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High‐performance LiFePO 4 cathode material was prepared by multiple intensification process with acid‐washed iron red as raw material
Author(s) -
Wang Qing,
Wang Yafeng,
Luo Shaohua,
Li Pengwei,
Yan Shengxue,
Zhang Yahui,
Liu Xin,
Mu Wenning,
Teng Fei,
Wang Yingling,
Lei Xuefei
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6963
Subject(s) - lithium iron phosphate , cathode , coating , carbon fibers , starch , materials science , electrochemistry , chemical engineering , lithium (medication) , conductivity , particle size , chemistry , composite material , electrode , composite number , organic chemistry , engineering , medicine , endocrinology
Summary LiFePO 4 carbon coating technology has been widely used in the lithium ion industries. However, there are still many challenges such as low ionic conductivity. This paper compares the residual carbon rate and electrical conductivity of sucrose, glucose, and soluble starch, and proposes a secondary carbon coating technology. The carbon‐coated lithium iron phosphate cathode material (LiFePO 4 /C) overcoated with soluble starch to improve the initial carbon layer. A variety of test methods are used to analyze the LiFePO 4 /C cathode. The results show that under the soluble starch coating of 20 wt%, particle size and morphology do not change significantly, surface graphitization degree and electrical conductivity increase, and thus electrochemical performance is improved. At the charge and discharge rate of 0.1 C, the specific discharge capacity of the first cycle is 27.7% higher than that of the initial sample, and the cycle stability is also significantly improved. The mechanism of soluble starch coating carbon layer on LiFePO 4 cathode is studied.