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 

机构地区：[1]School of Materials Science and Engineering,Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials,South China University of Technology,Guangzhou 510640,Guangdong,China [2]Analytical and Testing Center,South China University of Technology,Guangzhou 510640,Guangdong,China

出　　处：《Journal of Energy Chemistry》2023年第8期433-444,I0011,共13页能源化学（英文版）

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)。

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 density.Unfortunately,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 anodes.This remains a long-term open question and has been the most serious drawback toward application of metal oxide anodes.Here we clarify the origins of voltage hysteresis in the typical SnO2anode and propose a universal strategy to minimize it.With 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 cycles.The 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 cells.This effective strategy to minimize voltage hysteresis has also been demonstrated in Fe2O3,Co3O4-basded conversion-type anodes.This work provides important guidance to advance the high-capacity metal oxide anodes from laboratory to industrialization.

关 键 词：Conversion reaction Voltage hysteresis Energy efficiency PHOSPHATING 

分 类 号：TM912[电气工程—电力电子与电力传动] TB332[一般工业技术—材料科学与工程]