Issue 44, 2015
From the journal:

Journal of Materials Chemistry A

A high-capacity Li[Ni0.8Co0.06Mn0.14]O2 positive electrode with a dual concentration gradient for next-generation lithium-ion batteries†

Kang-Joon Park,a   Byung-Beom Lim,a   Moon-Ho Choi,a   Hun-Gi Jung,b   Yang-Kook Sun,*a   Marta Haro,c   Nuria Vicente,c   Juan Bisquertcd  and  Germà Garcia-Belmonte*c  

* Corresponding authors

a Department of Energy Engineering, Hanyang University, Seoul 133-791, South Korea
E-mail: yksun@hanyang.ac.kr

b Center for Energy Convergence, Korea Institute of Science and Technology, Seoul 136-791, South Korea

c Institute of Advanced Materials (INAM), Universitat Jaume I, ES-12071 Castelló, Spain
E-mail: garciag@uji.es

d Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia

Abstract

To increase the reversible capacity of layered lithium nickel-cobalt-manganese oxide, a Li[Ni0.8Co0.06Mn0.14]O2 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]O2 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]O2 without a concentration gradient. Electrochemical impedance spectroscopy showed that the high stability of the outer surface composition of Li[Ni0.64Co0.06Mn0.30]O2 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.

Graphical abstract: A high-capacity Li[Ni0.8Co0.06Mn0.14]O2 positive electrode with a dual concentration gradient for next-generation lithium-ion batteries

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Article information

DOI
https://doi.org/10.1039/C5TA05657H
Article type
Paper
Submitted
23 Jul 2015
Accepted
21 Sep 2015
First published
21 Sep 2015

J. Mater. Chem. A, 2015,3, 22183-22190

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A high-capacity Li[Ni0.8Co0.06Mn0.14]O2 positive electrode with a dual concentration gradient for next-generation lithium-ion batteries

K. Park, B. Lim, M. Choi, H. Jung, Y. Sun, M. Haro, N. Vicente, J. Bisquert and G. Garcia-Belmonte, J. Mater. Chem. A, 2015, 3, 22183 DOI: 10.1039/C5TA05657H

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