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A high-capacity Li[Ni0.8Co0.06Mn0.14]O-2 positive electrode with a dual concentration gradient for next-generation lithium-ion batteries

Title
A high-capacity Li[Ni0.8Co0.06Mn0.14]O-2 positive electrode with a dual concentration gradient for next-generation lithium-ion batteries
Author
선양국
Keywords
CATHODE MATERIALS; ELECTROCHEMICAL PROPERTIES; HIGH-ENERGY; PERFORMANCE; KINETICS; SURFACE; ANODES
Issue Date
2015-11
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v. 3, NO 44, Page. 22183-22190
Abstract
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.
URI
http://pubs.rsc.org/en/Content/ArticleLanding/2015/TA/C5TA05657H#!divAbstracthttp://hdl.handle.net/20.500.11754/28658
ISSN
2050-7488; 2050-7496
DOI
10.1039/c5ta05657h
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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