Journal
APPLIED SURFACE SCIENCE
Volume 593, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2022.153410
Keywords
Spinel; Li-gradient; Cycle performance; Lithium-ion batteries
Categories
Funding
- National Natural Science Foundation of China [52071255]
- Key Scientific and Technological Innovation Team of Shaanxi province [2020TD-001]
- Fundamental Research Funds for the Central Universities (China)
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Li-Mn-O spinels with a Li-gradient achieved by surface treatment exhibit good cycle stability and relatively high capacity.
Owing to the rapid Li ion extraction/insertion kinetics, Li-Mn-O spinels are promising candidates for high-power lithium-ion batteries that is required in electric vehicles. However, the Li-Mn-O spinel cathodes always suffer from poor cycling stability in practical due to the dissolution of Mn and Jahn-Teller distortion. Herein, we report on a new design of constructing a Li-gradient in Li-Mn-O spinel, which is achieved by surface treatment with lithium naphthalenide solution. The as-obtained Li1+xMn2-xO4 spinels exhibit a Li-gradient with decreasing Li concentration from surface to interior. Importantly, the highly doped surface ensures good cycle stability while the lightly doped bulk maintains a relatively high capacity. This work provides a new design for Li-Mn-O spinels to mitigate their stability problem.
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