Reducing voltage hysteresis of metal oxide anodes to achieve high energy efficiency for Li-ion batteries

作     者：Xuexia Lan Xingyu Xiong Jie Cui Renzong Hu Xuexia Lan;Xingyu Xiong;Jie Cui;Renzong Hu

作者机构：School of Materials Science and EngineeringGuangdong Provincial Key Laboratory of Advanced Energy Storage MaterialsSouth China University of TechnologyGuangzhou 510640GuangdongChina Analytical and Testing CenterSouth China University of TechnologyGuangzhou 510640GuangdongChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2023年第83卷第8期

页      面：433-444,I0011页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 52071144, 52231009,51831009, 51901043) the Guangdong Basic and Applied Basic Research Foundation (No. 2023B1515040011) the Guangzhou Key Research and Development Program (No. 202103040001) the TCL Science and Technology Innovation Fund (No.20222055) 

主　　题：Conversion reaction Voltage hysteresis Energy efficiency Phosphating 

摘      要：In the past two decades,a lot of high-capacity conversion-type metal oxides have been intensively studied as alternative anode materials for Li-ion batteries with higher energy ***,their large voltage hysteresis(0.8-1.2 V) within reversed conversion reactions results in huge round-trip inefficiencies and thus lower energy efficiency(50%-75%) in full cells than those with graphite *** remains a long-term open question and has been the most serious drawback toward application of metal oxide *** we clarify the origins of voltage hysteresis in the typical SnO2anode and propose a universal strategy to minimize *** the established in situ phosphating to generate metal phosphates during reversed conversion reactions in synergy with boosted reaction kinetics by the added P and Mo,the huge voltage hysteresis of 0.9 V in SnO_(2),SnO_(2)-Mo,and 0.6 V in SnO2-P anodes is minimized to 0.3 V in a ternary SnO_(2)-Mo-P(SOMP) composite,along with stable high capacity of 936 mA h g^(-1)after 800 *** small voltage hysteresis can remain stable even the SOMP anode operated at high current rate of10 A g^(-1)and wide-range temperatures from 60 to 30℃,resulting in a high energy efficiency of88.5% in full *** effective strategy to minimize voltage hysteresis has also been demonstrated in Fe2O3,Co3O4-basded conversion-type *** work provides important guidance to advance the high-capacity metal oxide anodes from laboratory to industrialization.