Charge compensation and capacity fading in LiCoO<sub>2</sub> at high voltage investigated by soft x-ray absorption spectroscopy

Charge compensation and capacity fading in LiCoO₂ at high voltage investigated by soft x-ray absorption spectroscopy

Long Xing-Hui^{1, 2, 3}, Wu Yan-Ru^{1, 2, 3}, Zhang Nian^{1, 2}, Yu Peng-Fei^{1, 2, †}, Feng Xue-Fei⁴, Zheng Shun^{1, 2, 3}, Fu Jia-Min^{1, 2, 5}, Liu Xiao-Song^{1, 2, 5}, Liu Na⁶, Wang Meng⁶, Xu Lei-Min⁶, Chen Jin-Ming⁷, Lee Jenn-Min⁷

(color online) (a) TFY and (b) TEY spectra of O K-edge of LiCoO₂ cathodes in the 1st cycle, (c) TFY and (d) TEY spectra of O K-edge of LiCoO₂ cathodes at fully charged state or fully discharged state with various capacity retention ratios.