KVPO4F and KVOPO4 toward 4 volt-class potassium-ion batteries

被引：308

作者：

Chihara, Kuniko ^{[1
]}

Katogi, Akihiro ^{[1
]}

Kubota, Kei ^{[1
,2
]}

Komaba, Shinichi ^{[1
,2
]}

机构：

[1] Tokyo Univ Sci, Dept Appl Chem, Shinjuku Ku, Tokyo 1628601, Japan

[2] Kyoto Univ, Elements Strategy Initiat Catalysts & Batteries, Nishikyo Ku, 1-30 Goryo Ohara, Kyoto 6158245, Japan

来源：

CHEMICAL COMMUNICATIONS | 2017年 / 53卷 / 37期

关键词：

RECHARGEABLE BATTERIES; CATHODE MATERIALS; V CATHODE; LI; INSERTION; FLUOROPHOSPHATE; SUBSTITUTION; ELECTRODES; FRAMEWORK; PHOSPHATE;

D O I：

10.1039/c6cc10280h

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Structurally identical KVPO4F and KVOPO4 are evaluated as positive electrode materials for non-aqueous potassium-ion batteries. KVPO4F and KVOPO4 show highly reversible potassium extraction/ insertion with discharge capacities of ca. 92mA h g(-1) and ca. 84 mA h g(-1), respectively, and their average discharge voltage reaches above 4.0 V with 1 M KPF6 EC/PC electrolyte at 2.0-5.0 V. Despite the extraction of large potassium-ions, their lattice volume shrinkages after charging to 5.0 V are 5.8% for KVPO4F and 3.3% for KVOPO4, leading to stable cycle performance. This is the first report to confirm the charge/discharge behaviours of vanadium phosphate electrodes in 4 V-class K cells.

引用

页码：5208 / 5211

页数：4

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