Lithium ion secondary battery composite electrolyte film, and making method and application thereof

A composite electrolyte and secondary battery technology, which is applied in the field of lithium-ion secondary battery composite electrolyte thin film and its preparation, can solve the problems that the processing performance has not been improved, weakened, and the conductivity of the electrolyte is not ideal, so as to achieve easy processing and good flexibility , The effect of high ionic conductivity

Active Publication Date: 2015-02-25
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the patent application CN103515649.A, which was applied for and published in China, a preparation method of an organic/inorganic composite electrolyte is introduced. Lithium salt and modified lithium metaaluminate are dispersed in a polymer that also has oxyethylene repeating units to obtain Organic/inorganic composite electrolyte materials have been developed, but the conductivity of the obtained electrolyte is still not ideal, and the processing performance has not been improved.
In the patent application CN101045762.A, which was applied for and published in China, an organic-inorganic composite polymer el

Method used

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Example Embodiment

[0020] Example 1

[0021] A preparation method of a lithium ion secondary battery composite electrolyte film provided in this embodiment includes:

[0022] 1) According to the target product Li 9.9 Ge 0.9 Ce 0.2 P 2 S 12 The measurement ratio of Li is weighed 2 S, GeS 2 , P 2 S 5 and CeO 2 , placed in a vacuum quartz tube furnace, the material was sintered at 500 °C for 24 h, and the sintered material was processed by ball milling at 350 rpm for 8 h to obtain Li 2 S-GeS 2 -P 2 S 5 -CeO 2 Inorganic electrolyte powder;

[0023] 2) According to the ratio of γ-aminopropyltriethoxysilane: inorganic electrolyte powder: anhydrous ethanol: 5mg: 1g: 10g, place the inorganic electrolyte powder material in the dissolved γ-aminopropyltriethoxysilane. In anhydrous ethanol solvent, stirring at 40 °C for 20 h, after high-speed centrifugation at 6000 rpm for 5 min, and vacuum drying at 70 °C for 12 h, the surface-modified inorganic electrolyte powder material was obtained;

[...

Example Embodiment

[0027] Embodiment 2

[0028] The present embodiment provides a method for preparing a composite electrolyte film for a lithium ion secondary battery, comprising:

[0029] 1) According to the target product Li 9.9 Ge 0.9 Ce 0.2 P 2 S 12 The measurement ratio of Li is weighed 2 S, GeS 2 , P 2 S 5 and CeO 2 , placed in a evacuated quartz tube furnace, the material was sintered at 500 °C for 12 h, and then processed by ball milling (270 rpm, 3 h) to obtain Li 2 S-GeS 2 -P 2 S 5 -CeO 2 Inorganic electrolyte powder;

[0030] 2) According to the ratio of γ-aminopropyltriethoxysilane:inorganic electrolyte powder:absolute ethanol to 1 mg:1g:90g, the above inorganic electrolyte powder was placed in a non-organic solution containing γ-aminopropyltriethoxysilane dissolved therein. In a water ethanol solvent, stirring at 50°C for 15h, centrifugal separation at 7000rpm, and vacuum drying at 70°C for 18h to obtain a surface-modified inorganic electrolyte powder material;

[0...

Example Embodiment

[0034] Embodiment 3

[0035] The present embodiment provides a method for preparing a composite electrolyte film for a lithium ion secondary battery, comprising:

[0036] 1) According to the target product Li 9.7 Ge 0.9 Ce 0.4 P 2 S 12 Materials Weigh Li 2 S, GeS 2 , P 2 S 5 and CeO 2 Raw material, sintered at 400℃ for 12h under vacuum condition, and then processed by ball milling (200rpm, 15h) to obtain Li 2 S-GeS 2 -P 2 S 5 -CeO 2 Inorganic electrolyte powder;

[0037] 2) According to the ratio of γ-aminopropyltriethoxysilane: inorganic electrolyte powder: absolute ethanol, 2 mg: 0.5 g: 8 g, the above-mentioned inorganic electrolyte powder was placed in the dissolved γ-aminopropyl triethoxysilane. In anhydrous ethanol solvent, stirring at 40°C for 45h, centrifuging at 8000rpm, and vacuum drying at 80°C for 24h to obtain surface-modified inorganic electrolyte powder materials;

[0038] 3) Dissolve 0.3g PVDF-HFP purchased from Sinopharm Group in 100g dimethylfo...

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Abstract

The invention concretely relates to a lithium ion secondary battery composite electrolyte film, and a making method and an application thereof. The making method of the lithium ion secondary battery composite electrolyte film comprises the following steps: 1) preparing inorganic electrolyte powder with the diameter of 10-100nm; 2) preparing a surface modified inorganic electrolyte powder material; and 3) making the composite electrolyte film. The lithium ion secondary battery composite electrolyte film with the advantages of high ion conductivity, good flexibility and easy processing can be made by adopting a conductive polymer containing a small amount of a lithium salt as a flexible conductive skeleton and adopting the high conductivity characteristic of the surface silanized inorganic electrode material through a slurry coating technology.

Description

【Technical field】 [0001] The invention relates to the technical field of electrolyte film preparation and application, in particular to a lithium-ion secondary battery composite electrolyte film and its preparation method and application. 【Background technique】 [0002] Lithium-ion batteries have become the main power source in the electronic product market since their appearance in the early 1990s, and they have increasingly occupied a larger market share in electric vehicle power supplies and energy storage systems. In recent years, with the upgrading of electronic products and the rapid development of new energy vehicles, lithium-ion batteries with high safety, deformability and high safety have become an important development direction of lithium-ion batteries in the future. [0003] The liquid electrolyte solution system is an important part of conventional lithium-ion batteries due to its high lithium ion conductivity. The main obstacle to the expansion of application...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/0525H01M10/056Y02E60/10
Inventor 左朋建高云智徐延铭李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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