Electrochemical reaction mechanisms under various charge-discharge operating conditions for Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ in a lithium-ion battery

Konishi, Hiroaki*; Hirano, Tatsumi*; Takamatsu, Daiko*; Gunji, Akira*; Feng, X.*; Furutsuki, Sho*; Okumura, Takafumi*; Terada, Shohei*; Tamura, Kazuhisa

The potential in each state of charge (SOC) during charging of Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ is higher than that during discharging. To clarify the effect of chargedischarge operating conditions on the electrochemical reaction, Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ was charged and discharged under various charge-discharge operating ranges, and OCP, crystal structure, and oxidation states of the ransition metals were evaluated by electrochemical measurement, XRD, and XAFS. These results indicate that OCP, lattice parameters, and oxidation states of the transition metals of Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ in each SOC are not constant. The XRD results indicate that two phases, namely, LiNi $_{0.33}$ Mn $_{0.33}$ Co $_{0.33}$ O $_{2}$ -like and Li $_{2}$ MnO $_{3}$ -like, exist in Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ .

Language	:	English
Journal	:	Journal of Solid State Chemistry
Volume	:	262
Number	:
Pages	:	p.294 - 300
Publication Year/Month	:	2018/06
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Paper URL	:	https://doi.org/10.1016/j.jssc.2018.03.028
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Keywords	:	no keyword
Research Facility	:	SPring-8(大型放射光施設)
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Registration No. : AA20180421
JAEA Abstracts No. : 47000212
Paper Submission No. : 20889

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Electrochemical reaction mechanisms under various charge-discharge operating conditions for LiNiMnCoO in a lithium-ion battery

Electrochemical reaction mechanisms under various charge-discharge operating conditions for Li $_{1.2}$ Ni $_{0.13}$ Mn $_{0.54}$ Co $_{0.13}$ O $_{2}$ in a lithium-ion battery