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图4 循环过程中Li1.2Ni0.15Co0.1Mn0.55O2氧化还原电对的变化[15]：(a) 在不同循环周期时，镍、钴、锰和氧元素对放电比容量的贡献；(b) 电子结构变化对费米能级的影响；(c) 每个元素的能级与氧化还原电对的关系图

Fig. 4 Redox couple evolution of Li1.2Ni0.15Co0.1Mn0.55O2 during cycling[15]. (a) the contribution towards the discharge capacity from Ni, Co, Mn and O redox at various cycles; (b) effects of electronic structure changeon the Fermi level; (c) diagram of the correlation between redox couple and energy level of each element