Li[Li1/5Ni1/5Mn3/5]O2の結晶性と電気化学特性の関係
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概要
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The lithium rich layered Li[Li1/5Ni1/5Mn3/5]O2 materials were prepared by mixing the Ni-Mn carbonate precursor with LiOH and followed by calcining at 800–1000°C. It was found that the charge/discharge curves of samples calcined at 800, 900°C tend to transform to spinel-like one, while the sample calcined at 1000°C maintains its original shape even after 30 cycles at 50°C. Rate of structure change depends on the crystallinity of samples and it would relate to the amount of oxygen release from the particle surface during the initial charge. Such oxygen release reaction predominantly proceeds beyond the initial charge capacity of 250 mAh g−1. Layered crystal structure finally changes to poorly crystalized rock-salt structure.