Reversible structural changes and high-rate capability of Li $_{3}$ PO $_{4}$ -modified Li $_{2}$ RuO $_{3}$ for lithium-rich layered rocksalt oxide cathodes

Taminato, So*; Hirayama, Masaaki*; Suzuki, Kota*; Kim, K.-S.*; Tamura, Kazuhisa ; Kanno, Ryoji*

Lithium-rich layered rocksalt oxides are promising cathode materials for lithium-ion batteries. We investigate the effects of surface modification by amorphous Li $_{3}$ PO $_{4}$ on the structures and electrochemical reactions in the surface region of an epitaxial Li $_{2}$ RuO $_{3}$ (010) film electrode. Structural characterization using SXRD, HAXPES, and NR shows that surface modification by Li $_{3}$ PO $_{4}$ resulted in the partial substitution of P for Li in the surface region of Li $_{2}$ RuO $_{3}$ . The modified (010) surface exhibits better rate capability at 20 C compared to the unmodified surface. surface XRD confirmed that highly reversible structural changes occurred at the modified surface during lithium (de)intercalation. These results demonstrate that this surface modification stabilizes the crystal structure in the surface region, and it can improve the rate capability of lithium-rich layered rocksalt oxide cathodes.

Language	:	English
Journal	:	Journal of Physical Chemistry C
Volume	:	122
Number	:	29
Pages	:	p.16607 - 16612
Publication Year/Month	:	2018/07
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Paper URL	:	https://doi.org/10.1021/acs.jpcc.8b04723
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Keywords	:	no keyword
Research Facility	:	SPring-8(大型放射光施設)
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Registration No. : AA20180420
JAEA Abstracts No. : 47000204
Paper Submission No. : 20881

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Reversible structural changes and high-rate capability of LiPO-modified LiRuO for lithium-rich layered rocksalt oxide cathodes

Reversible structural changes and high-rate capability of Li $_{3}$ PO $_{4}$ -modified Li $_{2}$ RuO $_{3}$ for lithium-rich layered rocksalt oxide cathodes