DOI: 10.1016/j.scib.2020.11.017
论文题名: Unlocking solid-state conversion batteries reinforced by hierarchical microsphere stacked polymer electrolyte
作者: Hu J. ; Chen K. ; Yao Z. ; Li C.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2021
卷: 66, 期: 7 起始页码: 694
结束页码: 707
语种: 英语
中文关键词: All-solid-state batteries
; C-N filler reinforcement
; Conversion fluoride cathode
; Li dendrite suppression
; Polymer electrolyte
英文关键词: Anodes
; Cathodes
; Filled polymers
; Fillers
; Fluorine compounds
; Iron compounds
; Lithium batteries
; Lithium sulfur batteries
; Metals
; Microspheres
; Polyelectrolytes
; Polyethylene oxides
; Reinforcement
; Solid-State Batteries
; Textures
; Anode-polymer interfaces
; Cathode-polymer interface
; Electrolyte interfaces
; Hierarchical microspheres
; Polyethylene oxide (PEO)
; Solid state conversion
; Threedimensional (3-d)
; Two Dimensional (2 D)
; Solid electrolytes
英文摘要: Pursuing all-solid-state lithium metal batteries with dual upgrading of safety and energy density is of great significance. However, searching compatible solid electrolyte and reversible conversion cathode is still a big challenge. The phase transformation at cathode and Li deformation at anode would usually deactivate the electrode–electrolyte interfaces. Herein, we propose an all-solid-state Li-FeF3 conversion battery reinforced by hierarchical microsphere stacked polymer electrolyte for the first time. This g-C3N4 stuffed polyethylene oxide (PEO)-based electrolyte is lightweight due to the absence of metal element doping, and it enables the spatial confinement and dissolution suppression of conversion products at soft cathode-polymer interface, as well as Li dendrite inhibition at filler-reinforced anode-polymer interface. Two-dimensional (2D)-nanosheet-built porous g-C3N4 as three-dimensional (3D) textured filler can strongly cross-link with PEO matrix and LiTFSI (TFSI: bistrifluoromethanesulfonimide) anion, leading to a more conductive and salt-dissociated interface and therefore improved conductivity (2.5 × 10–4 S/cm at 60 °C) and Li+ transference number (0.69). The compact stacking of highly regular robust microspheres in polymer electrolyte enables a successful stabilization and smoothening of Li metal with ultra-long plating/striping cycling for at least 10,000 h. The corresponding Li/LiFePO4 solid cells can endure an extremely high rate of 12 C. All-solid-state Li/FeF3 cells show highly stabilized capacity as high as 300 mAh/g even after 200 cycles and of ~200 mAh/g at extremely high rate of 5 C, as well as ultra-long cycling for at least 1200 cycles at 1 C. High pseudocapacitance contribution (>55%) and diffusion coefficient (as high as 10–12 cm2/s) are responsible for this high-rate fluoride conversion. This result provides a promising solution to conversion-type Li metal batteries of high energy and safety beyond Li-S batteries, which are difficult to realize true “all-solid-state” due to the indispensable step of polysulfide solid–liquid conversion. © 2020 Science China Press Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170268
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 201899, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
Recommended Citation:
Hu J.,Chen K.,Yao Z.,et al. Unlocking solid-state conversion batteries reinforced by hierarchical microsphere stacked polymer electrolyte[J]. Science Bulletin,2021-01-01,66(7)