Ester-based anti-freezing electrolyte achieving ultra-low temperature cycling for sodium-ion batteries  

作　　者：Yi-Tong Liu Hao-Jie Liang Miao Du Jia-Lin Yang Zhen-Yi Gu Xiao-Tong Wang Yuan-Zheng Tang Jin-Zhi Guo Xing-Long Wu 

机构地区：[1]Faculty of Chemistry,Northeast Normal University,Changchun,Jilin 130024,China [2]MOE Key Laboratory for UV Light-Emitting Materials and Technology,Northeast Normal University,Changchun,Jilin 130024,China [3]College of Electromechanical Engineering,Qingdao University of Science and Technology,Qingdao 260061,China

出　　处：《Journal of Materials Science & Technology》2024年第15期111-118,共8页材料科学技术（英文版）

基　　金：support from the Na-tional Key R&D Program of China(Grant No.2023YFE0202000);National Natural Science Foundation of China(No.52102213);Science Technology Program of Jilin Province(No.20230101128JC).

摘　　要：With the continuous advancement of industrialization,sodium-ion batteries(SIBs)need to operate in various challenging circumstances,particularly in extremely cold conditions.However,at ultra-low tem-peratures,the reduced ionic conductivity and sluggish Na+migration of commonly carbonate-based elec-trolytes will inevitably lead to a sharp decrease in the capacity of SIBs.Herein,we design a carboxylate ester-based electrolyte with excellent ultra-low temperature performance by straightforward cosolvent strategy.Due to the low viscosity,melting point,and sufficient ionic conductivity of the designed elec-trolyte,the resulting Na||Na_(3)V_(2)(PO_(4))_(2)O_(2)F can achieve the capacity retention of 96%(100 cycles at 0.1 C)at-40℃ and can also operate stably even at-50℃.Besides,galvanostatic intermittent titration tech-nique(GITT),ex-situ X-ray photoelectron spectroscopy(XPS),and high-resolution transmission electron microscopy(TEM)tests are employed to analyze and confirm that the carboxylate ester-based electrolyte promotes robust and uniform cathode/electrolyte interface layer formation and accelerates ion diffusion kinetics,which collectively facilitates the better low-temperature performance.In addition,the assembled hard carbon||NVPOF full cells further prove the practicability of the carboxylate ester-based electrolyte at low-temperature,which delivers high discharge capacity of 108.4 and 73.0 mAh g^(-1) at-25 and-40℃.This work affords a new avenue for designing advanced low-temperature electrolytes for SIBs.

关 键 词：Sodium-ion batteries Ester-based electrolyte Ultra-low temperature Cathode electrolyte interface Ionic conductivity 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]