Ultrathin salt-free polymer-in-ceramic electrolyte for solid-state sodium batteries  

作　　者：Bin Tang Yibo Zhao Zhiyi Wang Shiwei Chen Yifan Wu Yuming Tseng Lujiang Li Yunlong Guo Zhen Zhou Shou-Hang Bo 

机构地区：[1]Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education,School of Chemical Engineering,Zhengzhou University,Zhengzhou,450001,PR China [2]University of Michigan-Shanghai Jiao Tong University Joint Institute,Shanghai Jiao Tong University,800 Dong Chuan Rd.,Minhang District,Shanghai,200240,PR China [3]Department of Chemistry,City University of Hong Kong,Tat Chee Avenue,Kowloon,Hong Kong SAR,999077,PR China [4]School of Materials Science and Engineering,Institute of New Energy Material Chemistry,Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Renewable Energy Conversion and Storage Center(ReCast),Nankai University,Tianjin,300350,PR China [5]School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University,800 Dong Chuan Rd.,Minhang District,Shanghai,200240,PR China

出　　处：《eScience》2021年第2期194-202,共9页电化学与能源科学（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.51902201,51527801).The authors would also like to thank Dr.Chunjie Cao from Carl Zeiss(Shanghai)Co.,Ltd.for the XRM figure processing,and Ms.Yirong Gao for constructive suggestions and comments regarding the manuscript.

摘　　要：The practical energy density of solid-state batteries remains limited,partly because of the lack of a general method to fabricate thin membranes for solid-state electrolytes with high ionic conductivity and low area-specific resistance(ASR).Herein,we use an ultrahigh concentration of a ceramic ion conductor(Na_(3)SbS_(4))to build an ionconduction“highway”,and a polymer(polyethylene oxide,2 wt%)as a flexible host to prepare a polymer-inceramic ion-conducting membrane of approximately 40μm.Without the use of any salt(e.g.,NaPF_(6)),the resulting membrane exhibits a threefold increase in electronic ASR and a twofold decrease in ionic ASR compared with a pure ceramic counterpart.The activation energy for sodium-ion transport is only 190 meV in the membrane,similar to that in pure ceramic,suggesting ion transport predominantly occurs through a percolated network of ion-conducting ceramic particles.The salt-free design also provides an opportunity to suppress dendritic metal electrodeposits,according to a recently refined chemomechanical model of metal deposition.Our work suggests that salt is not always necessary in composite solid-state electrolytes,which broadens the choice of polymers to allow the optimization of other desired attributes,such as mechanical strength,chemical/electrochemical stability,and cost.

关 键 词：Composite solid-state electrolytes Hydrostatic hot-pressing Salt-free Polymer-in-ceramic 

分 类 号：TM9[电气工程—电力电子与电力传动]