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Vol. 13 (2021)

A Bifunctional-Modulated Conformal Li/Mn-Rich Layered Cathode for Fast-Charging, High Volumetric Density and Durable Li-Ion Full Cells

https://doi.org/10.1007/s40820-021-00643-1
Zedong Zhao
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Collaborative Innovation Center of Polymers and Polymer Composites, Fudan University, 2005 Songhu Road, Shanghai 200438, People’s Republic of China
Minqiang Sun
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Collaborative Innovation Center of Polymers and Polymer Composites, Fudan University, 2005 Songhu Road, Shanghai 200438, People’s Republic of China
Tianqi Wu
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Collaborative Innovation Center of Polymers and Polymer Composites, Fudan University, 2005 Songhu Road, Shanghai 200438, People’s Republic of China
Jiajia Zhang
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Collaborative Innovation Center of Polymers and Polymer Composites, Fudan University, 2005 Songhu Road, Shanghai 200438, People’s Republic of China
Peng Wang
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Collaborative Innovation Center of Polymers and Polymer Composites, Fudan University, 2005 Songhu Road, Shanghai 200438, People’s Republic of China
Long Zhang
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Collaborative Innovation Center of Polymers and Polymer Composites, Fudan University, 2005 Songhu Road, Shanghai 200438, People’s Republic of China
Chongyang Yang
National Engineering Research Center for Supercapacitor for Vehicles, Shanghai Aowei Technology Development Co., Ltd, Shanghai 201203, People’s Republic of China
Chengxin Peng
School of Materials Science & Engineering, University of Shanghai for Science and Technology, Shanghai 200093, People’s Republic of China
Hongbin Lu
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Collaborative Innovation Center of Polymers and Polymer Composites, Fudan University, 2005 Songhu Road, Shanghai 200438, People’s Republic of China

Corresponding Author: Hongbin Lu

hongbinlu@fudan.edu.cn

Nano-Micro Letters, Vol. 13 (2021), Article Number: 118

Abstract

Lithium- and manganese-rich (LMR) layered cathode materials hold the great promise in designing the next-generation high energy density lithium ion batteries. However, due to the severe surface phase transformation and structure collapse, stabilizing LMR to suppress capacity fade has been a critical challenge. Here, a bifunctional strategy that integrates the advantages of surface modification and structural design is proposed to address the above issues. A model compound Li1.2Mn0.54Ni0.13Co0.13O2 (MNC) with semi-hollow microsphere structure is synthesized, of which the surface is modified by surface-treated layer and graphene/carbon nanotube dual layers. The unique structure design enabled high tap density (2.1 g cm−3) and bidirectional ion diffusion pathways. The dual surface coatings covalent bonded with MNC via C-O-M linkage greatly improves charge transfer efficiency and mitigates electrode degradation. Owing to the synergistic effect, the obtained MNC cathode is highly conformal with durable structure integrity, exhibiting high volumetric energy density (2234 Wh L−1) and predominant capacitive behavior. The assembled full cell, with nanographite as the anode, reveals an energy density of 526.5 Wh kg−1, good rate performance (70.3% retention at 20 C) and long cycle life (1000 cycles). The strategy presented in this work may shed light on designing other high-performance energy devices.


Highlights:


1 A lithium- and manganese-rich (LMR) layered cathode with semi-hollow microsphere structure is synthesized, of which the unique structure design enabled high tap density (2.1 g cm−3) and bidirectional ion diffusion pathways
2 The surface coatings covalent bonded with LMR via C-O-M linkage greatly improves charge transfer efficiency and mitigates surface degradation
3 The LMR is highly conformal with durable structure integrity, exhibiting high volumetric energy density (2234 Wh L−1) and long cycling life (1000 cycles)

Keywords

Lithium- and manganese-rich layered cathode Semi-hollow microspheres Volumetric energy density Conformal structure Full cell
Zhao, Zedong, Minqiang Sun, Tianqi Wu, Jiajia Zhang, Peng Wang, Long Zhang, Chongyang Yang, Chengxin Peng, and Hongbin Lu. 2021. “A Bifunctional-Modulated Conformal Li/Mn-Rich Layered Cathode for Fast-Charging, High Volumetric Density and Durable Li-Ion Full Cells”. Nano-Micro Letters 13 (May):118. https://doi.org/10.1007/s40820-021-00643-1.
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