Boosting High-Voltage and Ultralong-Cycling Performance of Single-Crystal LiNi0.5Co0.2Mn0.3O2 Cathode Materials via Three-in-One Modification

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外文摘要：LiNi0.5Co0.2Mn0.3O2 is extensively researched as one of the most widely used commercially materials for Li-ion batteries at present.However,the poor high-voltage performance(≥4.3 V)with low reversible capacity limits its replacement for LiCoO2 in high-end digital field.Herein,three-in-one modification,Na-doping and Al2O3@Li3BO3 dual-coating simultaneously,is explored for single-crystalline LiNi0.5Co0.2Mn0.3O2(N-NCM@AB),which exhibits excellent high-voltage performance.N-NCM@AB displays a discharge-specific capacity of 201.8 mAh g-1 at 0.2 C with a high upper voltage of 4.6 V and maintains 158.9 mAh g-1 discharge capacity at 1 C over 200 cycles with the corresponding capacity retention of 87.8％.Remarkably,the N-NCM@AB llgraphite pouch-type full cell retains 81.2％of its initial capacity with high working voltage of 4.4 V over 1600 cycles.More importantly,the fundamental understandings of three-in-one modification on surface morphology,crystal structure,and phase transformation of N-NCM@AB are clearly revealed.The Na+doped into the Li-O slab can enhance the bond energy,stabilize the crystal structure,and facilitate Li+transport.Additionally,the interior surface layer of Li+-ions conductor Li3BO3 relieves the charge transfer resistance with surface coating,whereas the outer surface Al2O3 coating layer is beneficial for reducing the active materials loss and alleviating the electrode/electrolyte parasite reaction.This three-in-one strategy provides a reference for the further research on the performance attenuation mechanism of NCM,paving a new avenue to boost the high-voltage performance of NCM cathode in Li-ion batteries.

外文关键词：

Al2O3/Li3BO3 dual-coatingLi-ion batteriesNa dopingsingle-crystal cathodethree-in-one modification

作者：

Bao Zhang、Jixue Shen、Qi Wang、Changqing Hu、Bi Luo、Yun Liu、Zhiming Xiao、Xing Ou

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作者单位：

Engineering Research Center of the Ministry of Education for Advanced Battery Materials,School of Metallurgy and Environment,Central South University,Changsha 410083,China

Zhejiang Power New Energy Co.Ltd.,Zhuji 311899,China

Beijing Key Laboratory of Environmental Science and Engineering,School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Hunan ProvinceGraduate Innovation Project of Central South University

项目编号：

520701945190234751908555518228122020JJ57412020zzts093

出版年：

2023

DOI：

10.1002/eem2.12270

能源与环境材料(英文)

CSCD

ISSN：

年,卷(期)：2023.6(1)

参考文献量63