聚吡咯涂层改性的高温自阻断锂离子电池及其性能

doi:10.11896/cldb.19120189

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Abstract Due to many advantages of lithium-ion batteries, in recent years, they have been extensively applied in many fields, especially in digital electronics and electric vehicles. However, the further development of lithium-ion batteries was dragged down by the safety of lithium-ion batteries. To solve the problem, a new temperature-sensitive electrode based on polypyrrole(PPy) material with self-blocking function was explored for lithium ion batteries. A composite electrode of PPy-LiNi_0.6Co_0.2Mn_0.2O₂ (PPy-622) with the sandwich structure was prepared and tes-ted for electrochemical behavior. First of all, PPy coating of 5 μm thickness with positive temperature coefficient (PTC) characteristics was prepared on the aluminum foil. After drying, the 622 active material was coated on PPy coating and form a sandwich structure of PPy-622 electrode. At room temperature, the electrochemical behavior of the PPy-622 electrode was similar to that of the 622 electrode without the PTC coa-ting. However, PPy-622 electrode had a clear PTC behavior at about 140 ℃ to show the battery capacity dropped significantly, which can protect the thermal runaway of lithium-ion batteries. Due to the low cost of PPy and the simple preparation process of PPy-622 electrodes, this new PTC electrode offers great possibilities for building a safer lithium-ion battery.

Key words： lithium-ion battery temperature-sensitive electrode positive temperature coefficient material polypyrrole dedoping

Published: 23 February 2021

CLC number:

TQ311

Corresponding Authors: wangjingping@sust.edu.cn; 80737185@qq.com

About author:: Haixia An received her B.E. degree in polymer mate-rials and engineering from Shaanxi University of Science & Technology in 2017. She is currently pursuing her master's degree at the college of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology under the supervision of Associate Professor Jingping Wang. The main research directions during her master's degree are preparation and performance of PPy-based lithium ion battery positive temperature coefficient electrode.
Jingping Wang received his B.E. degree in polymer materials from Dalian Polytechnic University in 1997, received his Ph.D. degree in electronic science and technology from the School of Electronics and Information, Xi'an Jiaotong University in 2011. After two-year postdoctoral research at Hong Kong Polytechnic University(China), he is currently an associate professor in Shaanxi University of Science & Technology. His research interests are molding of polymer materials and energy storage polymer material and electrochemical wastewater treatment.
Xifei Li, professor and Ph.D. supervisor, was selected as the Clarivate Global Highly Cited Scientist in 2018,2019. He is the executive dean of the Institute of Advanced Electrochemical Energy of Xi'an University of Technology, deputy director of Modern Analysis and Testing Center, director of Shaanxi International Joint Research Center for Surface Technology of Energy Storage Materials, vice chairman of International Academy of Electrochemical Energy Science (IAOEES), and In-ternational executive editor of the journal Electrochemical Energy Reviews (immediate impact factor has exceeded 18), head of Shaanxi Provincial High-performance New Energy Power Battery Innovation Team, and executive director of Xi'an Nanotechnology Society. His research has focused on the design, optimization and application of micro/nano functional material interfaces.

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Cite this article:

AN Haixia,WANG Jingping,YANG Li, et al. High-temperature Self-blocking Lithium Ion Battery Modified by Polypyrrole Coating and Its Performance[J]. Materials Reports, 2021, 35(4): 4007-4011.

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http://www.mater-rep.com/EN/10.11896/cldb.19120189 OR http://www.mater-rep.com/EN/Y2021/V35/I4/4007

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