Accordion‐Like Fluorinated Graphite Nanosheets with High Power and Energy Densities for Wide‐Temperature, Long Shelf‐Life Sodium/Potassium Primary Batteries. Issue 20 (10th April 2021)

• Record Type: Journal Article
• Authors: Luo, Zhenya; Chen, Duanwei; Wang, Xiao; Huang, Jianyu; Pan, Yong; Lei, Weixin; Pan, Junan
• Is Part Of: Small. Volume 17:Issue 20(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-04-10
• Subjects: fluorinated graphite nanosheets -- high energy density -- long shelf‐life batteries -- sodium/potassium primary batteries -- wide‐temperature batteries; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202008163
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Sodium and potassium are considered to be the most promising anode candidates due to their easy availability, low‐cost and similar chemical properties to lithium. Here, novel 3D accordion‐like fluorinated graphite nanosheets (FGNSs) are reported as cathodes for sodium primary batteries (SPBs) and potassium primary batteries (PPBs). The FGNSs‐x cathode exhibits unprecedented power and energy density due to the impressive 3D structure, high F/C ratio (1.0), and more surface CC bonds (7.14%). The FGNSs‐1.0 exhibits very high specific capacities of 831.3 and 834.1 mAh g −1 for SPBs and PPBs, respectively, close to the theoretical capacity. Besides, the maximum energy density of FGNSs‐1.0 in SPBs and PPBs are 1960.5 and 2144.6 Wh kg −1, respectively. The maximum power density for Na/CFx and K/CFx batteries could reach up to 7076.8 and 6227.4 W kg −1, respectively. The electrochemical performance of FGNSs‐1.0 at extreme temperatures (−30 to 100 °C), long storage time (60 days), high mass loading (3.6 mg cm −2 ), and pouch‐type cell is also evaluated for the first time. Surprisingly, FGNSs‐1.0 has outstanding performance in these projects. Therefore, the new‐type Na/CF x and K/CF x primary battery systems developed here have broad application prospects in high‐energy applications that require high‐power, low‐cost, and normal use under extreme conditions. Abstract : The record‐high power and energy densities are obtained by using 3D accordion‐like fluorinated graphite nanosheets as the cathode. Combined with the advantages of low‐cost, wide operating temperature range, long shelf‐life, and excellent performance in high mass loading and pouch‐type cell, the new‐type Na/CF x and K/CF x battery systems developed here are promising substitutes for the commercial primary battery.