A non-topotactic redox reaction enabled K2V3O8 as a high voltage cathode material for potassium-ion batteries. Issue 99 (28th November 2019)

• Record Type: Journal Article
• Authors: Yang, Yusi; Liu, Zhifeng; Deng, Leqing; Tan, Lulu; Niu, Xiaogang; Sanad, Mustafa M. S.; Zeng, Liang; Zhu, Zhiping; Zhu, Yujie
• Is Part Of: Chemical communications. Volume 55:Issue 99(2019)
• Page Start: 14988
• Page End: 14991
• Publication Date: 2019-11-28
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1039/c9cc07996c
• Languages: English
• ISSNs: 1359-7345

Abstract

Abstract : K2 V3 O8 undergoes a non-topotactic but reversible phase transition between monoclinic KV3 O8 and tetragonal K2 V3 O8 during the electrochemical depotassiation–potassiation process. Abstract : When tested as the cathode material for potassium-ion batteries, K2 V3 O8 delivers a highly reversible capacity of over 100 mA h g −1 in the voltage range of 1.5–4.5 V with 73% capacity retained after 50 cycles. Charge–discharge is achieved by a nontopotactic process between K2 V3 O8 and KV3 O8 (Δ V ∼ −23.4%), causing the slow capacity decay.