气候变化领域集成服务门户(CCPortal): Unlocking solid-state conversion batteries reinforced by hierarchical microsphere stacked polymer electrolyte

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DOI	10.1016/j.scib.2020.11.017
	Unlocking solid-state conversion batteries reinforced by hierarchical microsphere stacked polymer electrolyte
	Hu J.; Chen K.; Yao Z.; Li C.
发表日期	2021
ISSN	20959273
起始页码	694
结束页码	707
卷号	66 期号:7
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
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
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207424
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
推荐引用方式 GB/T 7714	Hu J.,Chen K.,Yao Z.,et al. Unlocking solid-state conversion batteries reinforced by hierarchical microsphere stacked polymer electrolyte[J],2021,66(7).
APA	Hu J.,Chen K.,Yao Z.,&Li C..(2021).Unlocking solid-state conversion batteries reinforced by hierarchical microsphere stacked polymer electrolyte.Science Bulletin,66(7).
MLA	Hu J.,et al."Unlocking solid-state conversion batteries reinforced by hierarchical microsphere stacked polymer electrolyte".Science Bulletin 66.7(2021).