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Updated: Jun 4, 2025
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Published on: January 19, 2018
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Generality Rules and Synergistic Effect of Mitigating the Jahn-Teller Effect by Multisites Compositionally Complex
Shuyu Zhou1,2, Junhong Liao1, Chenglong Yu1
1Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.
ACS Nano
|December 17, 2024
Summary
Multicomponent doping in lithium manganese oxide cathodes suppresses Jahn-Teller distortion, enhancing battery performance. Increasing dopant species reduces structural instability and capacity fading in alkali-ion batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Jahn-Teller (JT) deformation causes structural distortion and capacity fading in alkali-ion battery cathode materials.
- Conventional doping strategies have limitations in fully understanding and regulating short-range and cooperative JT effects.
Purpose of the Study:
- To investigate the impact of multicomponent doping on suppressing Jahn-Teller distortion in spinel LiMn2O4 (LMO) cathodes.
- To elucidate the relationship between the number of dopant species and the regulation of short-range and cooperative JT effects.
Main Methods:
- Comparative study of LMO cathodes with varying numbers of dopant species (one, three, five) at tridoping sites.
- Analysis of MnO6 octahedral distortion, capacity retention, and structural stability.
Main Results:
- Increasing dopant species systematically decreased MnO6 octahedral distortion and improved capacity retention and structural stability.
- Mn-site doping disrupted short-range JT distortion, while 16c-site doping mitigated cooperative JT effects by disturbing d-orbital ordering.
- Complex doping strategy buffered JT strain, leading to isotropic volume distortion and significant suppression of both short-range and cooperative JT effects.
Conclusions:
- Multicomponent doping offers a synergistic approach to effectively suppress Jahn-Teller distortion in LMO cathodes.
- The findings provide generality rules for designing high-performance alkali-ion battery cathodes by controlling JT effects through doping strategies.
Keywords:
Jahn−Teller effectcompositionally complex dopinggenerality rulesspinel cathodesynergistic effectMore Related Videos
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