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Preparation method and application of all-solid-state electrolyte

An electrolyte and all-solid-state technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve problems affecting the battery interface structure and low chemical stability, and achieve stable interface characteristics and good cycle stability.

Pending Publication Date: 2022-05-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Claims
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Problems solved by technology

However, the low chemical stability of such groups affects the battery interface structure

Method used

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  • Preparation method and application of all-solid-state electrolyte
  • Preparation method and application of all-solid-state electrolyte
  • Preparation method and application of all-solid-state electrolyte

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Embodiment 1

[0029] Preparation of NCS (nitrogen-doped conjugated framework material): It was prepared by one-step polymerization in the reaction system of Thiotriazinone and Piperazine. First, cyanuric chloride (73.8.mg, 0.4mmol, CAS : 108-77-0) was dissolved in 10 mL of THF (tetrahydrofuran), cooled to 0 °C, then piperazine (51.7 mg, 0.6 mmol, CAS No.: 110-85-0) was added, and the polymerization was carried out in an ice bath for 4 hours , the white precipitate NCS was collected and washed with THF (CAS No: 109-99-9) by repeated Soxhlet extraction. The NCS yield was 82%.

[0030] Then NCS (253 mg) was mixed with 0.15M lithium bistrifluoromethanesulfonimide (LiTFSI, CAS number: 90076-65-6) to obtain a mixture NCS-LiTFSI, and dried in a vacuum oven at 60°C for 12 hours, then in N 2 It was calcined for 3 h under the atmosphere, and then pressed into tablets. The yield of NCS-LiTFSI was 95%.

[0031] First, the chemical structure of NCS was obtained using FTIR spectroscopy and 13 C soli...

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Abstract

The invention discloses a preparation method and application of an all-solid-state electrolyte, and the preparation method comprises the following steps: mixing a nitrogen-doped conjugated framework material with lithium bis (trifluoromethanesulfonyl) imide, then carrying out vacuum drying, calcining in an inert gas atmosphere, and tabletting to obtain the all-solid-state electrolyte, the concentration of the lithium bis (trifluoromethanesulfonyl) imide is 0.1 to 0.5 M; the mass ratio of the NCS to the organic solution is (5-9): 1. The material is used as a solid-state battery and has high Li < + > transfer number and room-temperature ionic conductivity and stable interface characteristics, and an assembled Li / LiFePO4 battery also shows good cycle stability.

Description

technical field [0001] The invention belongs to the technical field, and in particular relates to a preparation method and application of an all-solid electrolyte. Background technique [0002] Compared with organic electrolyte lithium-ion batteries, solid-state lithium batteries have higher specific energy and safety, and are considered to be the key technology for next-generation energy storage devices. High specific energy solid-state batteries need to use electrolytes that are stable to metal lithium anodes, and there are strict restrictions on the thickness and quality of this layer. Although linear polymer electrolytes represented by PEO have good ductility and low density, Li + The transport is mainly carried out through the chain conduction mechanism, and the ionic conductivity is very low when the segment crystallizes; the sulfide solid electrolyte has high ionic conductivity and good mechanical ductility, but its air stability and electrochemical stability are poo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0565H01M10/058H01M10/0525Y02P70/50Y02E60/10
Inventor 李忠涛程章祯林艳孔德斌张兴豪吴明铂智林杰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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