Park, Kang-Joon Lim, Byung-Beom Choi, Moon-Ho Jung, Hun-Gi Sun, Yang-Kook Haro, Marta Vicente, Nuria Bisquert, Juan Garcia-Belmonte, Germa 2024-01-20T05:34:38Z 2024-01-20T05:34:38Z 2021-09-05 2015-11 2050-7488 https://pubs.kist.re.kr/handle/201004/124816 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. English ROYAL SOC CHEMISTRY CATHODE MATERIAL ELECTROCHEMICAL PROPERTIES HIGH-ENERGY PERFORMANCE KINETICS SURFACE A high-capacity Li[Ni0.8Co0.06Mn0.14]O-2 positive electrode with a dual concentration gradient for next-generation lithium-ion batteries Article 10.1039/c5ta05657h 1 JOURNAL OF MATERIALS CHEMISTRY A, v.3, no.44, pp.22183 - 22190 JOURNAL OF MATERIALS CHEMISTRY A 3 44 22183 22190 scie scopus 000364080400029 2-s2.0-84946550135 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article CATHODE MATERIAL ELECTROCHEMICAL PROPERTIES HIGH-ENERGY PERFORMANCE KINETICS SURFACE