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

被引：293
|
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
收藏
页码：5208 / 5211
页数：4
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