Chemomechanically Stable Small Single‐crystal Mo‐doped LiNi0.6Co0.2Mn0.2O2 Cathodes for Practical 4.5 V‐class Pouch‐type Li‐ion Batteries

High voltage can cost‐effectively boost energy density of Ni‐rich cathodes based Li‐ion batteries (LIBs), but compromises their mechanical, electrochemical and thermal‐driven stability. Herein, a collaborative strategy (i.e., small single‐crystal design and hetero‐atom doping) is devised to construc...

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Bibliographic Details
Published inAngewandte Chemie International Edition Vol. 62; no. 11
Main Authors Liang, Longwei, Li, Xiaoying, Su, Maoshui, Wang, Lixian, Sun, Jinfeng, Liu, Yang, Hou, Linrui, Yuan, Changzhou
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 06.03.2023
EditionInternational ed. in English
Subjects
Batteries
Cathodes
Chemomechanically Reliablity
Crystals
Doping
Electrochemistry
High voltage
High voltages
High-Voltage Operation
Li-Ion Batteries
Lithium-ion batteries
Mo-Doped LiNi0.6Co0.2Mn0.2O2
Side reactions
Small Single Crystals
Stability
Temperature tolerance
Thermal stress
Voltage
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Summary:High voltage can cost‐effectively boost energy density of Ni‐rich cathodes based Li‐ion batteries (LIBs), but compromises their mechanical, electrochemical and thermal‐driven stability. Herein, a collaborative strategy (i.e., small single‐crystal design and hetero‐atom doping) is devised to construct a chemomechanically reliable small single‐crystal Mo‐doped LiNi0.6Co0.2Mn0.2O2 (SS‐MN6) operating stably under high voltage (≥4.5 V vs. Li/Li+). The substantially reduced particle size combined with Mo6+ doping absorbs accumulated localized stress to eradicate cracks formation, subdues the surface side reactions and lattice oxygen missing meanwhile, and improves thermal tolerance at highly delithiated state. Consequently, the SS‐MN6 based pouch cells are endowed with striking deep cycling stability and wide‐temperature‐tolerance capability. The contribution here provides a promising way to construct advanced cathodes with superb chemomechanical stability for next‐generation LIBs. Small single‐crystal Mo‐doped LiNi0.6Co0.2Mn0.2O2 with high chemomechanical reliability is constructed, and exhibits high‐rate capacities, long‐duration life, and low thermal activity under highly delithiated states for wide‐temperature‐tolerance Li‐ion batteries as competitive cathodes.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202216155