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Preparation of $$gamma$$-LiV$$_{2}$$O$$_{5}$$ from polyoxovanadate cluster Li$$_{7}$$[V$$_{15}$$O$$_{36}$$(CO$$_{3}$$)] as a high-performance cathode material and its reaction mechanism revealed by ${{it operando}}$ XAFS

バナジウム酸化物クラスターからの高性能正極電極作製および電極反応機構のオペランドXAFSによる解明

Wang, H.*; 磯部 仁*; 清水 剛志*; 松村 大樹  ; 伊奈 稔哲*; 吉川 浩史*

Wang, H.*; Idobe, Jin*; Shimizu, Takeshi*; Matsumura, Daiju; Ina, Toshiaki*; Yoshikawa, Hirofumi*

$$gamma$$-phase LiV$$_{2}$$O$$_{5}$$, which shows superior electrochemical performance as cathode material in Li-ion batteries, was prepared by annealing the polyoxovanadate cluster Li$$_{7}$$[V$$_{15}$$O$$_{36}$$(CO$$_{3}$$)]. The reaction mechanism was studied using ${{it operando}}$ X-ray absorption fine structure (XAFS), powder X-ray diffraction (PXRD), and X-ray photoelectron spectroscopy (XPS) analyses. The X-ray absorption near edge structure (XANES) and XPS results reveal that $$gamma$$-LiV$$_{2}$$O$$_{5}$$ undergoes two-electron redox reaction per V$$_{2}$$O$$_{5}$$ pyramid unit, resulting in a large reversible capacity of 260 Ah/kg. The extended X-ray absorption fine structure (EXAFS) and PXRD analyses also suggest that the V-V distance slightly increases, due to the reduction of V$$^{5+}$$ to V$$^{4+}$$ during Li ion intercalation as the material structure is maintained. As a result, $$gamma$$-Li$$_{x}$$V$$_{2}$$O$$_{5}$$ shows highly reversible electrochemical reaction with x = 0.1-1.9.

使用言語

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English

掲載資料名

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Journal of Power Sources

巻

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360

号

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ページ数

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p.150 - 156

発行年月

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2017/08

発表会議名

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開催年月

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開催都市

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開催国

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キーワード

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バナジウムクラスター; オペランドXAFS; 正極電極材料

特許データ

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PDF

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論文URL

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https://doi.org/10.1016/j.jpowsour.2017.06.011

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使用施設

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SPring-8(大型放射光施設)

広報プレスリリース

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論文解説記事
(成果普及情報誌)

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受委託・共同研究相手機関

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Access

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- Accesses

InCites™

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パーセンタイル：44.85

分野：Chemistry, Physical

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