期刊
INORGANIC CHEMISTRY
卷 57, 期 6, 页码 3223-3231出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.7b03257
关键词
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资金
- Recruitment Program of Global Youth Experts
- National Natural Science Foundation of China [51304248, 11504162]
- Program for New Century Excellent Talents in University [NCET-11-0525]
- Doctoral Fund of Ministry of Education of China [20130162110002]
- Program for Shenghua Overseas Talents from Central South University
- State Key Laboratory of Powder Metallurgy at Central South University, Changsha, China
Limited practical capacity and poor cyclability caused by sluggish kinetics and structural instability are essential aspects that constrain the potential application of Li2MnSiO4 cathode materials. Herein, Li2Mn1-xCaxSiO4/C nanoplates are synthesized using a diethylene-glycol-assisted solvothermal method, targeting to circumvent its drawbacks. Compared with the pristine material, the Ca-substituted material exhibits enhanced electrochemical kinetics and improved cycle life performance. In combination with experimental studies and first-principles calculations, we reveal that Ca incorporation enhances electronic conductivity and the Li-ion diffusion coefficient of the Ca-substituted material, and it improves the structural stability by reducing the lattice distortion. It also shrinks the crystal size and alleviates structure collapse to enhance cycling performance. It is demonstrated that Ca can alleviate the two detrimental factors and shed lights on the further searching for suitable dopants.
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