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 condi-tions,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 conforma-tion and thermal pathways fabricated through ice-template strat-egy 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 real-ize 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.

Cong Guo;Lu He;Yihang Yao;Weizhi Lin;Yongzheng Zhang;Qin Zhang;Kai Wu;Qiang Fu

College of Polymer Science and Engineering,State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,People's Republic of China;Department of Polymer Science and Engineering,School of Chemical Engineering,Nanjing University of Science and Technology,Nanjing 210094,People's Republic of China

纳微快报（英文）

[1]Cong Guo;Lu He;Yihang Yao;Weizhi Lin;Yongzheng Zhang;Qin Zhang;Kai Wu;Qiang Fu-.Bifunctional Liquid Metals Allow Electrical Insulating Phase Change Materials to Dual-Mode Thermal Manage the Li-Ion Batteries)[J].纳微快报（英文）,2022(12):224-238

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