All-climate aqueous Na-ion batteries using "water-in-salt" electrolyte

• 作者: Yu Zhang Jie Xu Zhi Li Yanrong Wang Sijia Wang Xiaoli Dong Yonggang Wang
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2022,（2）
• 所属期刊栏目: ARTICLES
• 页码范围: 161-170
• 页数: 10页
• 语种: 英文

摘要

Aqueous Na-ion batteries have been extensively studied for large-scale energy storage systems.However,their wide application is still limited by their inferior cycle stability (＜3000 cycles) and poor temperature tolerance.Furthermore,many of the reported high rate behaviors are achieved at a low mass loading (＜3 mg cm-2) of the electrodes.Herein,we propose an aqueous Na-ion battery which includes a Ni-based Prussian blue (NiHCF) cathode,a carbonyl-based organic compound,5,7,12,14-pentacenetetrone (PT)anode and a "water-in-salt" electrolyte (17 mol kg-1 NaClO4 in water).Its operation involves the rever-sible coordination reaction of the PT anode and the extraction/insertion of Na+ in the NiHCF cathode.It is demonstrated that the wide internal spaces of the PT anode and NiHCF cathode can not only buffer the volumetric change induced by Na+ storage,but also enable fast kinetics.The full cell exhibits a supercapacitor-like rate performance of 50 A g-1 (corresponding to a discharge or charge within 6.3 s)and a super-long lifespan of 15,000 cycles.Moreover,the excellent rate performance can still be pre-served even with a high mass loading of the electrodes (15 mgNiHCF cm-2 and 8 mgPT cm-2).Especially,the cell can work well in a wide temperature range,from-40 to 100 ℃,showing a typical all-climate operation.