Application of integrated structure in solid-state lithium ion battery

A lithium-ion battery and solid-state electrolyte technology, which is applied in the manufacture of secondary batteries, non-aqueous electrolyte batteries, and electrolyte batteries, can solve the problems of poor interface performance and low conductivity of all-solid-state lithium-ion batteries, and achieve industrial applications. The preparation process is simple and the effect of good charge and discharge performance

Inactive Publication Date: 2019-04-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problems of poor interface performance and low conductivity of existing

Method used

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  • Application of integrated structure in solid-state lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Take 2g of lithium iron phosphate electrode material, 0.25g of acetylene black, 0.25g of polyvinylidene fluoride in 12ml of N-methylpyrrolidone 300r / min ball mill for 24h, mix evenly and coat on aluminum foil. Vacuum-dried at 80°C for 12 hours to obtain a positive electrode sheet.

[0028] (2) Take 2g of polyacrylonitrile powder, 0.05g of lithium perchlorate, and 0.1g of aluminum oxide particles and add them to 20ml of dimethylformamide and stir for 20 hours to obtain a uniform mixed solution, and then pour it into a polytetrafluoroethylene mold , vacuum drying at 25 °C for 12 h to obtain a composite solid electrolyte.

[0029] (3) Put the composite solid electrolyte on the positive electrode sheet, and heat press at 30° C. for 6 hours with a hot press to obtain an integrated positive electrode solid electrolyte structure.

[0030] (4) Assemble the all-solid-state lithium-ion battery in the following form: positive electrode case-spring leaf-stainless steel gasket-...

Embodiment 2

[0033] (1) Take 1g of lithium cobalt oxide electrode material, 0.9g of carbon nanotubes, 0.6g of polyvinylidene fluoride in 10ml of N-methylpyrrolidone 300r / min ball mill for 24h, mix them evenly and coat them on aluminum foil. Vacuum-dried at 80°C for 12 hours to obtain a positive electrode sheet.

[0034] (2) Take 2g of polyacrylonitrile powder, 0.06g of lithium perchlorate, and 0.8g of aluminum oxide particles and add them to 20ml of dimethylformamide and stir for 20 hours to obtain a uniform mixed solution, and then pour it into a polytetrafluoroethylene mold , vacuum drying at 40 °C for 42 h to obtain a composite solid electrolyte.

[0035] (3) Put the composite solid electrolyte on top of the positive electrode sheet, and press it with a hot press at 90°C for 15 hours to obtain an integrated structure of the positive electrode solid electrolyte

[0036] (4) Assemble the all-solid-state lithium-ion battery in the following form: positive electrode case-spring leaf-stainl...

Embodiment 3

[0039] (1) Take 1.5g of nickel-cobalt lithium manganate electrode material, 0.7g of graphene, 0.3g of polyvinylidene fluoride in 10ml of N-methylpyrrolidone 300r / min ball mill for 24h, mix evenly and coat on aluminum foil. Vacuum-dried at 80°C for 12 hours to obtain a positive electrode sheet.

[0040] (2) Take 2g of polyacrylonitrile powder, 0.1g of lithium perchlorate, and 0.4g of aluminum oxide particles and add them to 20ml of dimethylformamide and stir for 20 hours to obtain a uniform mixed solution, and then pour it into a polytetrafluoroethylene mold , vacuum drying at 40 °C for 42 h to obtain a composite solid electrolyte.

[0041] (3) Put the composite solid electrolyte on top of the positive electrode sheet, and use a hot press at 90°C for 24 hours to obtain an integrated positive electrode solid electrolyte structure

[0042] (4) Assemble the all-solid-state lithium-ion battery in the following form: positive electrode case-spring leaf-stainless steel gasket-positi...

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Abstract

The invention discloses an application of an integrated structure in a solid-state lithium ion battery, and belongs to the technical field of solid-state lithium ion batteries. The preparation methodcomprises the following steps: (1) uniformly coating an aluminum foil with a positive active material, a conductive agent, a binder and a solvent in a ball milling and mixing manner to obtain a positive plate; (2) uniformly stirring and mixing a polymer, inorganic particles, lithium salt and a solvent, and obtaining a composite solid electrolyte through a solution casting method; (3) putting the composite solid electrolyte obtained in the step (2) on the positive plate obtained in the step (1), and carrying out hot pressing by using a hot press to obtain a positive solid electrolyte integratedstructure; and (4) assembling the negative electrode into the all-solid-state lithium ion battery by using a metal lithium sheet. The all-solid-state lithium ion battery prepared by the method disclosed by the invention is small in interface impedance and excellent in cycle performance.

Description

technical field [0001] The invention relates to the technical field of solid-state lithium-ion batteries, in particular to the application of an integrated structure in solid-state lithium-ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in various portable electronic products, electric energy storage equipment and other fields since the commercialization of lithium-ion batteries in 1990 due to their advantages such as high energy density, high output power, and long cycle life. However, traditional lithium-ion batteries mostly use leaky, volatile, and explosive organic electrolytes, which greatly reduces the safety performance of lithium-ion batteries. All-solid-state lithium-ion batteries can fundamentally solve battery safety problems because they do not contain liquid organic solvents. [0003] Inorganic solid electrolytes have high ionic conductivity, but have very poor contact with the positive and negative interfaces. Polymer ...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 王海辉韩庆月王素清陈国平胡欣超
Owner SOUTH CHINA UNIV OF TECH
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