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Solid-state electrolyte, preparation method thereof, and solid-state battery containing the solid-state electrolyte

A technology of solid electrolyte and electrolyte powder, which is applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, solid electrolyte, etc. It can solve problems such as high addition of nano-inorganic powder, poor mechanical properties of solid electrolyte, and difficult breakthrough in room temperature conductivity. Achieve the effects of reducing the risk of fire and explosion, good room temperature ionic conductivity, and improving safety

Active Publication Date: 2018-12-11
中国电子新能源(武汉)研究院有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with single solid electrolyte, the performance of composite solid electrolyte has been greatly improved, but the room temperature conductivity is still difficult to break through 10 -4 S / cm
As far as the current conductivity is relatively high (2~4×10 -4 S / cm) The solid electrolyte composed of PEO or PPC and nano-LLZO inorganic powder has the following problems: (1) strict environment is required during the preparation process, including drying of raw materials and solvents, water control during processing and storage, etc. , otherwise gel phenomenon will easily occur, and the environmental stability is poor; (2) PEO or PPC softens significantly when the temperature is higher than 60 ° C, and the mechanical properties of solid electrolytes are poor at high temperatures; (3) The amount of nano-inorganic powder added is relatively high , increasing electrolyte cost

Method used

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  • Solid-state electrolyte, preparation method thereof, and solid-state battery containing the solid-state electrolyte
  • Solid-state electrolyte, preparation method thereof, and solid-state battery containing the solid-state electrolyte
  • Solid-state electrolyte, preparation method thereof, and solid-state battery containing the solid-state electrolyte

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preparation example Construction

[0038] Another object of the present invention, such as figure 1 Shown, the preparation method of solid-state electrolyte, this method is based on above-mentioned any one described solid-state electrolyte, comprises the following steps:

[0039] S1, material preparation: prepare the required materials according to the following mass ratio: the mass ratio of polymer matrix, lithium salt and inorganic ceramic electrolyte powder x:(100-x-y):y (wherein x≥60, y≥5);

[0040] S2. Drying of raw materials: vacuum-dry the polymer matrix, lithium salt, and inorganic ceramic electrolyte powder at high temperature. The drying time and temperature are not particularly limited, and those skilled in the art can choose according to actual needs; The material matrix, lithium salt, and inorganic ceramic electrolyte powder are vacuum-dried at 100°C to 200°C for 4h to 12h;

[0041] S3. Dispersion of inorganic ceramic electrolyte powder: uniformly disperse the inorganic ceramic electrolyte powder in...

Embodiment 1

[0048] Embodiment 1, making solid electrolyte

[0049] The inorganic ceramic electrolyte was dispersed in NMP (N-methylpyrrolidone). Subsequently, PVDF (polyvinylidene fluoride), PVDF-HFP (poly(vinylidene fluoride-co-hexafluoropropylene)) and LiTFSI (lithium bistrifluoromethanesulfonimide) were added to the mixture to form a uniform slurry. The solids content of the slurry was 15%. Based on the weight of the solid electrolyte, the polymer matrix accounted for 65%, of which the weight ratio of PVDF to PVDF-HFP was 5:5, LiTFSI accounted for 25%, and the inorganic ceramic electrolyte accounted for 10wt%. The prepared slurry is coated on the foil by a coating machine, and the solid electrolyte is obtained by vacuum drying after the solvent is completely evaporated.

[0050] The physical figure of the solid electrolyte prepared in embodiment 1 is as follows figure 2 As shown, the solid electrolyte has good mechanical properties and can be wound.

Embodiment 2

[0051] Embodiment 2, making solid electrolyte

[0052] Disperse the inorganic ceramic electrolyte in NMP. Subsequently, PVDF, PVDF-HFP and LiTFSI were added into the mixture and stirred evenly to form a uniform slurry. The solids content of the slurry was 12%. Based on the weight of the solid electrolyte, the polymer matrix accounts for 85%, of which the weight ratio of PVDF to PVDF-HFP is 5:5, LiTFSI accounts for 10wt%, and the inorganic ceramic electrolyte accounts for 5%. The prepared slurry is coated on the foil by a coating machine, and after the solvent is completely volatilized, it is vacuum-dried to obtain a solid electrolyte, such as image 3 Shown is the AC impedance spectrum of the solid electrolyte.

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Abstract

The invention relates to a solid-state electrolyte, a preparation method thereof and a solid-state battery containing the solid-state electrolyte, wherein the solid-state electrolyte is composed of apolymer matrix, a lithium salt and an inorganic ceramic electrolyte powder; The preparation method of the solid electrolyte comprises the following steps: S1, preparing materials; 2, drying raw materials; S3, dispersion of inorganic ceramic electrolyte powder; 4, that polymer matrix is dissolve; S5, lithium salt dissolution; 6, prepare a solid electrolyte; A solid-state battery having a positive electrode, a negative electrode, and a solid-state electrolyte according to any one of the above disposed between the positive electrode and the negative electrode; The solid electrolyte provided by the present invention, The lithium ion battery has good room temperature ionic conductivity, mechanical performance and processing performance, can greatly improve the safety of the lithium ion battery,simplify the production process and reduce the production cost. At the same time, the solid-state battery manufactured by the solid-state electrolyte has good electric performance and safety performance, and the risk of fire and explosion of the battery is reduced effectively.

Description

technical field [0001] The invention relates to the technical field of solid-state batteries, in particular to a solid-state electrolyte, a preparation method thereof and a solid-state battery containing the solid-state electrolyte. Background technique [0002] At present, lithium-ion batteries have a huge impact on people's daily life and the national economy. Its applications include commercial electronic products, such as mobile phones, computers, digital cameras, etc., automotive power devices, and energy storage for renewable energy power stations. The improvement and perfection of lithium-ion battery technology has further expanded its application fields, and at the same time put forward more stringent requirements for its performance. [0003] At present, commercial lithium-ion batteries on the market widely use organic liquid electrolytes. Organic liquid electrolytes are easy to corrode the positive and negative electrodes, which will cause irreversible loss of batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0562H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/0565H01M10/058H01M2300/0071H01M2300/0082Y02E60/10Y02P70/50
Inventor 宋半夏徐谦孔维和任少华余佳川
Owner 中国电子新能源(武汉)研究院有限责任公司
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