Citation: Na LIU. Mechanism of the effect of carbon coating on high temperature cycle performance of LiFePO₄[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(12): 2287-2294. doi: 10.11862/CJIC.2023.210 shu

Mechanism of the effect of carbon coating on high temperature cycle performance of LiFePO₄

Na LIU

Contemporary Amperex Technology Co., Ltd., Ningde, Fujian 352100, China

Received Date: 31 July 2023
Revised Date: 15 November 2023

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To investigate mechanism of carbon coating on the high-temperature cycle performance of widely used LiFePO₄/graphite batteries, two types of LiFePO₄ cathode material with different carbon coating degrees were prepared. According to characterization results from X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), powder resistance, and coin cell, two types of LiFePO₄ were almost identical with respect to the crystal structure, particle size, and specific capacity. Then LiFePO₄/graphite pouch cells were prepared and cycled at 1C under 60 ℃. It turns out that carbon coating can improve capacity retention from 80.4% to 84.9% after 1 251 cycles. The capacity improvement for polarization capacity and thermodynamic capacity account for 76% and 24%, respectively. This demonstrates that the mechanism of carbon coating is to reduce the polarization capacity loss by forming integrated conducting networks. In contrast, carbon coating can not inhibit Fe dissolution directly. Instead, it may be an indirect interaction through the reduction of moisture.
- LiFePO₄,
- graphite anode,
- lithium-ion battery,
- carbon coating,
- cycle performance,
- mechanism analysis
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沈阳化工大学材料科学与工程学院沈阳 110142

Mechanism of the effect of carbon coating on high temperature cycle performance of LiFePO4

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通讯作者: 陈斌, bchen63@163.com

Mechanism of the effect of carbon coating on high temperature cycle performance of LiFePO₄