Preparation of conductive fire retardant and its application in Li-ion battery

doi:10.12028/j.issn.2095-4239.2019.0009

Abstract

Abstract: Short circuit in lithium ion battery is the main cause of thermal runaway, the proper safety additives can prevent the thermal runaway. A positive temperature coeffcient material (PANI-PEW) was prepared by polymering amount of PANI particles on the surface of PEW. The morphology and conductivity of PANI-PEW, the electrochemical performance of LiFePO₄ batteries with PANI-PEW were tested at room temperature and 120℃. The results showed as follow:the conductivity of PANIPEW was 1.08×10^-3 S/m at room temperature and its resistant increased rapidly during 90~120℃. It had little effect on the impedance and cycling performance when PANI-PEW introduced into LiFePO₄ battery at 0.5 C and 1 C. But the impedance of LiFePO₄ battery with 15% PANI-PEW increased rapidly and the frst specifc capacity only was 35.3mA·h/g after the LiFePO₄ electrode with 15% PANI-PEW was treated at 120℃ for 1 min, even after the 12th cycle, the specifc capacity closed to 0. This study indicate that the PANI-PEW is an excellent PTC composite and improved the safety performance of LiFePO₄ battery at 120℃.

Key words: safety, polyaniline, polyethylene wax, thermal runaway, interfacial polymerization

CLC Number:

TQ037.1

HE Hao, PAN Junan, LEI Weixin, PAN Yong, HU Jiaqing, LIAO Ang. Preparation of conductive fire retardant and its application in Li-ion battery[J]. Energy Storage Science and Technology, 2019, 8(4): 718-724.

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