Issue

Vol. 13 (2021)

Boosting the Electrochemical Performance of Li- and Mn-Rich Cathodes by a Three-in-One Strategy

https://doi.org/10.1007/s40820-021-00725-0
Wei He
State Key Lab of Physical Chemistry of Solid Surface, Collaborative Innovation Center of Chemistry for Energy Materials, College of Materials and Pen‑Tung Sah Institute of Micro‑Nano Science and Technology, Xiamen University, Xiamen 361005, People’s Republic of China
Fangjun Ye
State Key Lab of Physical Chemistry of Solid Surface, Collaborative Innovation Center of Chemistry for Energy Materials, College of Materials and Pen‑Tung Sah Institute of Micro‑Nano Science and Technology, Xiamen University, Xiamen 361005, People’s Republic of China
Jie Lin
State Key Lab of Physical Chemistry of Solid Surface, Collaborative Innovation Center of Chemistry for Energy Materials, College of Materials and Pen‑Tung Sah Institute of Micro‑Nano Science and Technology, Xiamen University, Xiamen 361005, People’s Republic of China
Qian Wang
State Key Lab of Physical Chemistry of Solid Surface, Collaborative Innovation Center of Chemistry for Energy Materials, College of Materials and Pen‑Tung Sah Institute of Micro‑Nano Science and Technology, Xiamen University, Xiamen 361005, People’s Republic of China
Qingshui Xie
State Key Lab of Physical Chemistry of Solid Surface, Collaborative Innovation Center of Chemistry for Energy Materials, College of Materials and Pen‑Tung Sah Institute of Micro‑Nano Science and Technology, Xiamen University, Xiamen 361005, People’s Republic of China
Fei Pei
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People’s Republic of China
Chenying Zhang
State Key Lab of Physical Chemistry of Solid Surface, Collaborative Innovation Center of Chemistry for Energy Materials, College of Materials and Pen‑Tung Sah Institute of Micro‑Nano Science and Technology, Xiamen University, Xiamen 361005, People’s Republic of China
Pengfei Liu
Zhengzhou Key Laboratory of Big Data Analysis and Application, Henan Academy of Big Data, Zhengzhou University, Zhengzhou 450002, People’s Republic of China
Xiuwan Li
Fujian Provincial Key Laboratory of Light Propagation and Transformation, College of Information Science and Engineering, Huaqiao University, Xiamen 361021, People’s Republic of China
Laisen Wang
State Key Lab of Physical Chemistry of Solid Surface, Collaborative Innovation Center of Chemistry for Energy Materials, College of Materials and Pen‑Tung Sah Institute of Micro‑Nano Science and Technology, Xiamen University, Xiamen 361005, People’s Republic of China
Baihua Qu
State Key Lab of Physical Chemistry of Solid Surface, Collaborative Innovation Center of Chemistry for Energy Materials, College of Materials and Pen‑Tung Sah Institute of Micro‑Nano Science and Technology, Xiamen University, Xiamen 361005, People’s Republic of China
Dong‑Liang Peng
State Key Lab of Physical Chemistry of Solid Surface, Collaborative Innovation Center of Chemistry for Energy Materials, College of Materials and Pen‑Tung Sah Institute of Micro‑Nano Science and Technology, Xiamen University, Xiamen 361005, People’s Republic of China

Corresponding Author: Baihua Qu

bhqu@xmu.edu.cn

Nano-Micro Letters, Vol. 13 (2021), Article Number: 205

Abstract

There are plenty of issues need to be solved before the practical application of Li- and Mn-rich cathodes, including the detrimental voltage decay and mediocre rate capability, etc. Element doping can effectively solve the above problems, but cause the loss of capacity. The introduction of appropriate defects can compensate the capacity loss; however, it will lead to structural mismatch and stress accumulation. Herein, a three-in-one method that combines cation–polyanion co-doping, defect construction, and stress engineering is proposed. The co-doped Na+/SO42− can stabilize the layer framework and enhance the capacity and voltage stability. The induced defects would activate more reaction sites and promote the electrochemical performance. Meanwhile, the unique alternately distributed defect bands and crystal bands structure can alleviate the stress accumulation caused by changes of cell parameters upon cycling. Consequently, the modified sample retains a capacity of 273 mAh g−1 with a high-capacity retention of 94.1% after 100 cycles at 0.2 C, and 152 mAh g−1 after 1000 cycles at 2 C, the corresponding voltage attenuation is less than 0.907 mV per cycle.


Highlights:


1 A novel three-in-one method is put forward to prepare Li- and Mn-rich cathode.
2 The stress evolution of layered materials during cycling is characterized.
3 The capacity and voltage stability are enhanced greatly.

Keywords

Li- and Mn-rich cathodes Cation–polyanion co-doping Defect and stress engineering Good structure stability Electrochemical performance
He, Wei, Fangjun Ye, Jie Lin, Qian Wang, Qingshui Xie, Fei Pei, Chenying Zhang, Pengfei Liu, Xiuwan Li, Laisen Wang, Baihua Qu, and Dong‑Liang Peng. 2021. “Boosting the Electrochemical Performance of Li- and Mn-Rich Cathodes by a Three-in-One Strategy”. Nano-Micro Letters 13 (October):205. https://doi.org/10.1007/s40820-021-00725-0.
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