期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 44, 页码 22183-22190出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta05657h
关键词
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资金
- Center for Hybrid Interface Materials (HIM) - Ministry of Science, ICT & Future Planning of Korea [2013M3A6B1078875]
- National Research Foundation of Korea (NRF) - Korea government (MEST) [2014R1A2A1A13050479]
- Generalitat Valenciana [ISIC/2012/008]
To increase the reversible capacity of layered lithium nickel-cobalt-manganese oxide, a Li [Ni0.8Co0.06Mn0.14]O-2 positive electrode with a two-sloped full concentration gradient (TSFCG) was successfully synthesized via co-precipitation. The TSFCG maximizes the Ni concentration in the particle core and the Mn concentration on the particle surface. The TSFCG Li[Ni0.8Co0.06Mn0.14]O-2 positive electrode showed improved overall electrochemical properties (i.e., reversible capacity, cycle life, and rate capability) and thermal stability compared to a conventional positive electrode (CC) Li [Ni0.8Co0.06Mn0.14]O-2 without a concentration gradient. Electrochemical impedance spectroscopy showed that the high stability of the outer surface composition of Li[Ni0.64Co0.06Mn0.30]O-2 is responsible for reduction in surface resistance and charge transfer resistance by decreasing the parasitic reaction with the electrolyte. These reduced resistances explain the superior rate capability of TSFCG positive electrodes.
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