Abstract
LiNi0.8CO0.15Al0.05O2, being one of the promising cathode materials for lithium‐ion batteries, shows a distinct capacity fading after charge/discharge cycling and/or storage at high temperatures. The origin of these deteriorations has been explored by investigating the electronic and structural changes of the cathode material using X‐ray absorption spectroscopy. Ni K‐edge XAFS measurements were performed in two different modes: surface‐sensitive conversion electron yield (CEY) mode and bulk‐sensitive transmission mode. The Ni K‐edge XANES showed that, after the cycle and aging tests, the Ni valences at the near‐surface of the cathode particles became much lower than those in bulk. Whereas, the EXAFS showed that the bulk and surface‐averaged Ni–O bond distances remained unchanged after the tests. These electronic and structural changes which occur prominently at near‐surface are probably the main cause of the battery deterioration phenomenon.
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