Persistent State‐of‐Charge Heterogeneity in Relaxed, Partially Charged Li1−xNi1/3Co1/3Mn1/3O2 Secondary Particles
Advanced Materials2016Vol. 28(31), pp. 6631–6638
Citations Over TimeTop 10% of 2016 papers
William E. Gent, Yiyang Li, Sung-Jin Ahn, Jongwoo Lim, Yijin Liu, Anna M. Wise, Chirranjeevi Balaji Gopal, David N. Mueller, Ryan C. Davis, Johanna Nelson Weker, J. Park, Seok‐Kwang Doo, William C. Chueh
Abstract
Ex situ transmission X-ray microscopy reveals micrometer-scale state-of-charge heterogeneity in solid-solution Li1- x Ni1/3 Co1/3 Mn1/3 O2 secondary particles even after extensive relaxation. The heterogeneity generates overcharged domains at the cutoff voltage, which may accelerate capacity fading and increase impedance with extended cycling. It is proposed that optimized secondary structures can minimize the state-of-charge heterogeneity by mitigating the buildup of nonuniform internal stresses associated with volume changes during charge.
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