期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 29, 页码 24508-24515出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b06286
关键词
lithium-ion batteries; nickel-rich cathodes; multishell precursors; cation diffusion; electrochemical properties
资金
- NSF of Shandong Province [ZR2017BEM010, ZR2016JL015]
- NSFC [51672109]
The rational design of concentration-gradient (CG) structure is demonstrated as an available approach to improve the electrochemical performances of high-energy nickel-rich cathodes for lithium-ion batteries (LIBs). However, the complicated preparing processes, especially the CG-precursors, generally result in the lessthan-ideal repeatability and consistency that is regarded as an extreme challenge for the widespread commercialization. Thus, the innovative strategy with facile steps and the feasibility of large-scale preparation for commercialized applications should be urgently developed. Herein, through the temperature-tunable cation diffusion, the feasibility of controllable preparation of nickel-rich CG-LiNi0.7Co0.15Mn0.15O2 (NCM) from multishell precursors is first demonstrated. As expected, the Li/CGNCM half cells show much enhanced cycle-life, rate property, and safety because of the mitigated side-reactions and fast Li+ kinetics. Besides, the Li4Ti5O12/CG-NCM full cells also exhibit long-term lifespan, 95% capacity retention even after 2000 cycles, and high-rate behaviors. Importantly, by contrast with the conventional techniques that prepare CG cathodes from CG precursors, the proposed new synthesis strategy from multishell precursors is suitable for large-scale preparation. Overall, this multishell precursor-facilitated synthesis probably promotes the practical applications of CG cathodes for state-of-the-art LIBs and also can be easily expanded to controllably preparing spinel- and olive-type CG cathodes.
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