High‐performanceLiFePO4cathode material was prepared by multiple intensification process with acid‐washed iron red as raw material

Abstract

LiFePO4 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 (LiFePO4/C) overcoated with soluble starch to improve the initial carbon layer. A variety of test methods are used to analyze the LiFePO4/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 LiFePO4 cathode is studied.