Negative Enthalpy Doping Stabilizes P2‐Type Oxides Cathode for High‐Performance Sodium‐Ion Batteries
Abstract
Abstract P2‐type Na 0.67 Ni 0.33 Mn 0.67 O 2 (NNMO) as cathode material for sodium‐ion batteries (SIBs) largely suffers from continuous accumulation of local stress caused by destructive structural evolution and irreversible oxygen loss upon cycling, leading to rapid capacity degradation. Herein, a strategy of negative enthalpy doping (NED), wherein transition metal (TM) sites are substituted with 0.01 mol each Sn, Sb, Cu, Ti, Mg, and Zn to increase the stability of the TM layers, is proposed. The robust structure of NED‐NNMO significantly suppresses the P2 to O2 phase transition and improves the Na + kinetics upon long‐term cycling. Consequently, the NED‐NNMO exhibits much smoothened voltage platforms and improved oxygen redox reversibility, thus considerably extended lifetime as compared with the pristine NNMO sample. The NED‐NNMO delivers a high capacity of 138.9 mAh g −1 with an operation voltage of 3.51 V under 0.1 C and prominent capacity retention of 94.6% after 100 cycles under 1 C, and 90.0% over 3000 cycles under ultra‐high rate of 30 C, which is among the best over previous reports. Moreover, an ampere‐hour scale pouch cell based on the NED‐NNMO demonstrates an energy density of 139 Wh kg −1 . This work sheds light on a route of negative enthalpy doping to design high‐performance sodium‐ion batteries.
Article Details
Authors (25)
Yongcong Huang
Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen 518055 China
Shuai Gu
College of Chemistry and Chemical Engineering, Hunan Key Laboratory of Micro & Nano Materials Interface Science
Xin Xu
Zibing An
Xiaodong Han
Yulin Cao
Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen 518055 China
Dongsheng He
Fangchang Zhang
Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen 518055 China
Hao Guo
Yan Liu
Xingqun Liao
Shenzhen Highpower Technology Co., Ltd. Shenzhen Guangdong 518111 P. R. China
Guiyu Liu
Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen Guangdong 518055 P. R. China
Peiwen Liu
Shanghai Key Laboratory of Chemical Biology, School of Pharmacy
Feng Wu
Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering
Yingzhi Li
Zhenyu Wang
Institute of Environmental Processes and Pollution Control, School of Environment and Ecology
Zhiqiang Wang
Chao Ding
Yanfang Wang
State Key Laboratory of Advanced Drug Delivery and Release Systems, College of Pharmaceutical Sciences
Jingjing Chen
School of Pharmaceutical Science and Technology, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences
Mingyang Yang
Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi’an Jiaotong University
Feng Jiang
State Key Laboratory of Integrated Optoelectronics, JLU Region, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China
Yonghong Deng
Zhenghe Xu
Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen China
Zhouguang Lu
Guangdong Provincial Key Laboratory of Energy Materials for Electric Power, Department of Materials Science and Engineering