Fabrication of fire‐response functional separators with microcapsule fire extinguishing agent for lithium‐ion battery safety
Ping Lou,
Weixin Zhang,
Qigao Han,
Shun Tang,
Jie Tian,
Yan Li,
Hao Wu,
Yunhui Zhong,
Yuan‐Cheng Cao,
Shijie Cheng
Affiliations
Ping Lou
State Grid Huzhou Electric Power Supply Company Huzhou 313000 PR China
Weixin Zhang
State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China
Qigao Han
State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China
Shun Tang
State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China
Jie Tian
Shenzhen Power Supply Co. Ltd. Shenzhen 518001 China
Yan Li
Shenzhen Power Supply Co. Ltd. Shenzhen 518001 China
Hao Wu
Zhejiang Landun Electronic New Material Technology Co. Ltd. Hangzhou 311418 China
Yunhui Zhong
Zhejiang Landun Electronic New Material Technology Co. Ltd. Hangzhou 311418 China
Yuan‐Cheng Cao
State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China
Shijie Cheng
State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China
Abstract Fire safety issues hinder the large‐scale application of lithium‐ion batteries (LiBs). Here, a new type of fire‐response separators is prepared by loading the microcapsule fire extinguishing agent on the surface of the separator. The shell of the microcapsule will break automatically at a certain temperature and release the fire extinguishing agent when thermal runaway of LiBs occurs, which can quickly absorb heat through endothermic reaction and ensure LiBs will not burn or explode. The porosity of fire‐response separator is 53.6%, the electrolyte uptake is 132% and the ionic conductivity is 1.00 mS cm‐1. The initial specific capacity is 2643 mAh g‐1 at 4°C and the capacity retention rate is 93% after 200 cycles for NCM523 battery based fire‐response separator. The temperature of LiBs based on the fire‐response separator can automatically drop to room temperature in 20 seconds, which ensures the safety of other adjacent LiBs. This work proposes a new active protection concept to solve the safety problem of LiBs.
