Influence of PAN/PANI polymer on low-temperature rate performance of LiFePO4

被引：0

作者：

Ruoxuan Liu

Hongyuan Guo

Haoyan Gu

Weida Li

Jingrui Cao

Xin Ren

Quanjun Fu

Guangchuan Liang

机构：

[1] Hebei University of Technology,Institute of Power Source and Ecomaterials Science

[2] Tianjin EV Energies Co.,Key Laboratory of Special Functional Materials for Ecological Environment and Information (Hebei University of Technology)

[3] LTD,Key Laboratory for New Type of Functional Materials in Hebei Province

[4] Sichuan Development Lomon Co.,undefined

[5] LTD,undefined

[6] Ministry of Education,undefined

[7] Hebei University of Technology,undefined

来源：

Ionics | 2023年 / 29卷

关键词：

LiFePO; Wet-coating; PAN/PANI; Low-temperature rate performance;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

In order to improve the charge transfer rate and Li+ diffusion coefficient of LiFePO4 (LFP), the material was surface treated with polyacrylonitrile/polyaniline (PAN/PANI). PAN/PANI polymers were synthesized by a self-assembly process, and LFP@PAN/PANI were prepared by a wet-coating process. LFP@PAN/PANI exhibits superior electrochemical performance compared to bare LFP, with a discharge capacity of 3088.97 mAh at low temperature and high rate condition (−20 °C, 26650-type cylindrical battery, 5 C rate), and a relatively high low-temperature discharge plateau (2.68 V). Electrochemical impedance spectroscopy (EIS) proves that the Li+ diffusion coefficient of LFP@PAN/PANI is an order of magnitude higher than that of bare LFP. The above performance is improved because the polar cyano group of the polymer can interact with the electrolyte and Li+, and the polyaniline makes the polymer have high conductivity. Therefore, the composite of the two polymers endows LFP with excellent Li+ activity and high conductivity.

引用

页码：2175 / 2189

页数：14