Intrinsic mechanism of Co/Mn elemental manipulation in enhancing the cycling stability of single-crystal ultrahigh-nickel layered cathodes

被引:1
|
作者
Han, Duzhao [1 ]
Chen, Jinniu [1 ]
Li, Weipeng [1 ]
Xie, Liang [1 ]
Yan, Zheng [2 ]
Tang, Zexun [3 ]
Wu, Hao [4 ]
Peng, Jiali [5 ]
Dolotko, Oleksandr [5 ]
Zhao, Yuxin [6 ]
Hua, Weibo [1 ]
Wu, Yuping [7 ]
Tang, Wei [1 ]
机构
[1] Xi An Jiao Tong Univ, Sch Chem Engn & Technol, Xian 710049, Peoples R China
[2] Shanghai Inst Space Power, State Key Lab Space Power Sources Technol, 2965 Dongchuan Rd, Shanghai 200245, Peoples R China
[3] Hunan Inst Engn, Coll Mat & Chem Engn, Xiangtan 411104, Peoples R China
[4] Guangdong Jiana Energy Technol Co Ltd, Guangzhou 511449, Guangdong, Peoples R China
[5] Inst Appl Mat IAM, Karlsruhe Inst Technol KIT, D-76344 Eggenstein Leopoldshafen, Germany
[6] CNPC Tubular Goods Res Inst TGRI, Xian 710077, Peoples R China
[7] Southeast Univ, Sch Energy & Environm, Nanjing 210096, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
LITHIUM-ION BATTERIES; NI-RICH; PERFORMANCE;
D O I
10.1039/d4ta01437e
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Ultrahigh-nickel layers suffer from poor cycling stability. Ultrahigh-nickel single-crystal cathodes with Co/Mn elements doped in the transition metal layer are considered promising to overcome this challenge via effectively mitigating the microcrack issue. However, the intrinsic mechanism by which Co/Mn elements enhance the cycling stability of single-crystal ultrahigh-nickel cathodes, as well as the dominant role of structural evolution and surface side reactions in the cycling fading of single-crystal cathodes, remains unclear. Herein, the single-crystal LiNiO2 (SC-N) with manipulated Co/Mn doping as LiNi0.9Co0.1O2 (SC-NC) and LiNi0.9Mn0.1O2 (SC-NM) oxides are synthesized to reveal the correlation between crystal structural evolution and electrochemical performance. The alleviated intensity and delayed onset potential of H2/H3 phase transition in the SC-NM cathode effectively mitigate the abrupt anisotropic lattice collapse, thereby enhancing the morphology integrity of the particles. Despite a higher cation mixing degree, the excellent structural stability derived from the reversible H2/H3 phase transition also provides favorable kinetics for repeated lithiation/delithiation. As a result, the Co-free SC-NM cathode can exhibit unconventional cycling stability with a capacity retention of 93.8% after 100 cycles at 0.5C between 2.7 and 4.3 V compared to the SC-N and SC-NC cathodes with capacity retention values of 71.7% and 81.1%, respectively under the same condition. This study emphasizes the importance of regulating the crystal structure evolution via Co/Mn manipulation in constructing high-performance single-crystal ultrahigh-nickel layered cathodes. We synthesized single-crystal ultrahigh-nickel layered cathodes with manipulated Co/Mn doping to reveal the correlation between crystal structural evolution and performance. Our study emphasizes the importance of regulating the crystal structure evolution constructing high-performance cathodes.
引用
收藏
页码:13724 / 13732
页数:9
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