High Oxidation Potential ≈6.0 V of Concentrated Electrolyte toward High‐Performance Dual‐Ion Battery. Issue 25 (12th May 2021)

• Record Type: Journal Article
• Authors: Tong, Xiaoyu; Ou, Xuewu; Wu, Nanzhong; Wang, Haiyan; Li, Jin; Tang, Yongbing
• Is Part Of: Advanced energy materials. Volume 11:Issue 25(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-05-12
• Subjects: cycling durability -- dual‐ion batteries -- high oxidation potential -- reversible FSI− insertion -- suppressed gas formation; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.202100151
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Dual‐ion batteries (DIBs) show the advantages of high working voltage, cost‐effectiveness, and environmental friendliness, but conventional electrolytes commonly cannot satisfy simultaneously the requirements of wide voltage range and high‐concentration, leading to poor cycling durability and limited energy density. In this work, an electrolyte system with 4.0 m lithium bis(fluorosulfonyl)imide (LiFSI) dissolved in tetramethylene sulfone, which shows merits of i) high oxidation potential ≈6.0 V to enable the insertion/deinsertion of FSI − reversibly at the graphite cathode, ii) dramatically suppressed gas formation under high working voltage, and iii) significantly elevated full‐cell DIB energy density, is developed. The DIB constructed with such an electrolyte is able to exhibit 113.3 mAh g −1 capacity and ≈4.6 V medium discharge voltage at 200 mA g −1, along with 94.7% capacity retention after 1000 cycles. Moreover, this DIB delivers an energy density of ≈180 Wh kg −1 (including electrolyte which contributes to the capacity and electrode materials), one of the best performances amongst the related work on DIBs. Abstract : The developed 4.0 m LiFSI/tetramethylene sulfone high‐concentration and high‐voltage electrolyte, significantly suppresses gas formation, enhances anion intercalation performance of FSI − at the graphite cathode, and enables reversible plating/stripping of Li + . As a result, the dual‐ion battery based on this electrolyte system is able to exhibit much improved capacity and energy density.