A high-capacity Li[Ni0.8Co0.06Mn0.14]O-2 positive electrode with a dual concentration gradient for next-generation lithium-ion batteriesopen access
- Authors
- Park, Kang-Joon; Lim, Byung-Beom; Choi, Moon-Ho; Jung, Hun-Gi; Sun, Yang Kook; Haro, Marta; Vicente, Nuria; Bisquert, Juan; Garcia-Belmonte, Germa
- Issue Date
- Sep-2015
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, v.3, no.44, pp.22183 - 22190
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- Volume
- 3
- Number
- 44
- Start Page
- 22183
- End Page
- 22190
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/24866
- DOI
- 10.1039/c5ta05657h
- ISSN
- 2050-7488
- 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.
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