钠离子电池用O3型层状NaCrO_(2)正极材料在高温下的优异倍率性能和结构演变  

Superior rate performance and structural evolution of O3-type layered NaCrO_(2) for sodium ion batteries at high temperatures

作　　者：孟祥聪 梁锦记 梁敏 李文雅 林琛翰 柯曦 施志聪 刘丽英 Xiangcong Meng;Jinji Liang;Min Liang;Wenya Li;Chenhan Lin;Xi Ke;Zhicong Shi;Liying Liu(School of Materials and Energy,Guangzhou Key Laboratory of Low-dimensional Materials and Energy Storage Devices,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]School of Materials and Energy,Guangzhou Key Laboratory of Low-dimensional Materials and Energy Storage Devices,Guangdong University of Technology,Guangzhou 510006,China

出　　处：《Science China Materials》2023年第9期3445-3452,共8页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China (21673051);the Natural Science Foundation of Guangdong Province of China (2021A1515010388)。

摘　　要：为满足钠离子电池的实际应用,本文采用一种低能耗方法合成了层状NaCrO_(2)正极材料.合成的O3型NaCrO_(2)正极材料即使在高温下也表现出优异的倍率性能.在60℃,100 C倍率下测试时比容量高达47.4 mA h g^(-1),这是由于适当的高温促进了Na^(+)的扩散.然而,与室温下良好的循环性能相比,高温循环过程中NaCrO_(2)发生了复杂的不可逆结构演变,这导致NaCrO_(2)高温循环性能下降.这项工作将推动具有优异倍率性能、尤其是优异高温倍率性能的钠离子电池层状氧化物正极材料的产业化发展,同时加深对层状氧化物正极材料高温容量衰减机制的理解.In order to meet the practical application of sodium ion batteries(SIBs),a low energy consumption method is recommended to synthesize the layered NaCrO_(2) cathode materials.Enabled by the larger Na+diffusion coefficients promoted by a proper high temperature,the as-synthesized O3-type NaCrO_(2) material shows superior rate performance even at elevated temperatures,exhibiting 47.4 mA h g^(−1) at 100 C and 60℃.Opposite to the good cyclic capability at room temperature,however,the high-temperature cyclability of NaCrO_(2) deteriorates due to the complex irreversible structural evolution in NaCrO_(2) during cycling at elevated temperatures.This work boosts the industrial development of layered oxide cathode materials for SIBs with outstanding high-rate performance especially at high temperatures,and in the meantime deepens the understanding of the high-temperature capacity decay mechanism for layered oxide cathode materials.

关 键 词：钠离子电池 正极材料 倍率性能 层状氧化物 高温循环性能 容量衰减 结构演变 低能耗 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ131.12[化学工程—无机化工]