Bifunctional Liquid Metals Allow Electrical Insulating Phase Change Materials to Dual-Mode Thermal Manage the Li-Ion Batteries  

作　　者：Cong Guo Lu He Yihang Yao Weizhi Lin Yongzheng Zhang Qin Zhang Kai Wu Qiang Fu 

机构地区：[1]College of Polymer Science and Engineering,State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,People’s Republic of China [2]Department of Polymer Science and Engineering,School of Chemical Engineering,Nanjing University of Science and Technology,Nanjing 210094,People’s Republic of China

出　　处：《Nano-Micro Letters》2022年第12期224-238,共15页纳微快报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(No.52103091);the Natural Science Foundation of Jiangsu Province(No.BK20200501);the State Key Laboratory of Polymer Materials Engineering(No.sklpme2022-3-15).

摘　　要：Phase change materials(PCMs)are expected to achieve dual-mode thermal management for heating and cooling Li-ion batteries(LIBs)according to real-time thermal conditions,guaranteeing the reliable operation of LIBs in both cold and hot environments.Herein,we report a liquid metal(LM)modified polyethylene glycol/LM/boron nitride PCM,capable of dual-mode thermal managing the LIBs through photothermal effect and passive thermal conduction.Its geometrical conformation and thermal pathways fabricated through ice-template strategy are conformable to the LIB’s structure and heat-conduction characteristic.Typically,soft and deformable LMs are modified on the boron nitride surface,serving as thermal bridges to reduce the contact thermal resistance among adjacent fillers to realize high thermal conductivity of 8.8 and 7.6 W m^(−1) K^(−1) in the vertical and in-plane directions,respectively.In addition,LM with excellent photothermal performance provides the PCM with efficient battery heating capability if employing a controllable lighting system.As a proof-of-concept,this PCM is manifested to heat battery to an appropriate temperature range in a cold environment and lower the working temperature of the LIBs by more than 10℃ at high charging/discharging rate,opening opportunities for LIBs with durable working performance and evitable risk of thermal runaway.

关 键 词：Phase change materials Liquid metal Thermal conductivity Photothermal conversion Battery thermal management 

分 类 号：TM912[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]