X-ray absorption near-edge structure study on positive electrodes of degraded lithium-ion battery

Shikano M; Kobayashi H; Koike S; Sakaebe H; Saito Y; Hori H; Kageyama H; Tatsumi K

Journal of Power Sources, Vol.196, No.16, 6881-6883, 2011

DOI10.1016/j.jpowsour.2011.01.042 Export Citation

X-ray absorption near-edge structure study on positive electrodes of degraded lithium-ion battery

Shikano M, Kobayashi H, Koike S, Sakaebe H, Saito Y, Hori H, Kageyama H, Tatsumi K

18650-type cylindrical cells using LiNi(1/3)Mn(1/3)Co(1/3)O(2) (NMC) and hard carbon as positive and negative electrode material, respectively, were fabricated and degraded by cycle tests. The capacity of the cells remained more than 95% and 85% after cycle tests at 25 and 50 degrees C, respectively. After the cycle tests. Li-deficient cubic phase was observed on the surface of NMC. This phenomenon should be related to the degradation mechanism of this type of cell. (C) 2011 Elsevier B.V. All rights reserved.

Keywords:Lithium-ion battery;XANES;Degradation;Positive electrode