Positive electrode of all-solid-state lithium battery and manufacturing method thereof, and all-solid-state lithium battery

A production method and all-solid-state technology, applied in electrode manufacturing, battery electrodes, lithium batteries, etc., can solve the problems of small contact area and large internal resistance, improve contact area, reduce battery internal resistance, and increase energy density and rate performance effect

Active Publication Date: 2014-08-06
TONGDING INTERCONNECTION INFORMATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the contact between the positive electrode active material and the electrolyte is still in a point-to-point manner between particles, the contact area is small, and the internal resistance is large.

Method used

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  • Positive electrode of all-solid-state lithium battery and manufacturing method thereof, and all-solid-state lithium battery
  • Positive electrode of all-solid-state lithium battery and manufacturing method thereof, and all-solid-state lithium battery
  • Positive electrode of all-solid-state lithium battery and manufacturing method thereof, and all-solid-state lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Choose lithium cobalt oxide: 70Li 2 S.30P 2 S 5 Glass-ceramic (glass-ceramic) electrolyte: Vapor-grown carbon fiber is mixed according to the mass ratio of 70:25:5 and mixed evenly in a planetary ball mill under the protection of argon, and then pressed into a thickness of about 150 μm under a hot press After completion, place the thin slice in a quartz seal tube with sulfur (S) element at the bottom and vacuum seal it, then keep the seal tube at 400°C~450°C for 6 hours (h), and then slowly cool it down. Then, the active pole piece filled with S simple substance was adhered to the aluminum current collector coated with PVDF conductive glue on the surface, and cold pressed and dried to obtain the positive pole piece.

[0044] Add the pressed glass-ceramic electrolyte sheet with a thickness of 100μm to the side of the positive electrode sheet close to the active electrode, and go through 360MPa hot pressing or cold pressing to make the two tightly connected together, an...

Embodiment 2

[0046] Choose lithium cobalt oxide: 70Li 2 S.30P 2 S 5 Glass-ceramic electrolyte: Vapor-grown carbon fiber is mixed according to the mass ratio of 70:25:5 and mixed evenly in a planetary ball mill under the protection of argon, and then pressed into a thin sheet with a thickness of about 150 μm under a hot press. Place this flake on the bottom with GeS 2 Put the simple substance in a sealed quartz tube and vacuum seal it, then keep the sealed tube at 600~650°C for 6h, and then cool it down slowly. This is then populated with GeS 2 The simple active pole piece is adhered to the aluminum current collector coated with PVDF conductive glue on the surface, and cold-pressed and dried to obtain the positive pole piece.

[0047] Add the pressed glass-ceramic electrolyte sheet with a thickness of 100μm to the side of the positive electrode sheet close to the active electrode, and go through 360MPa hot pressing or cold pressing to make the two tightly connected together, and then pr...

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Abstract

The invention provides a manufacturing method for a positive electrode of an all-solid-state lithium battery. The manufacturing method comprises the following steps: step 1, providing a mixed pressed active pole piece, putting the active pole piece and sulfide in a vacuum sealed tube, carrying out heat treatment at a temperature of 200 to 1000 DGE C for 1 to 20 h and then carrying out slow cooling to room temperature so as to obtain a sublimated positive plate; and step 2, placing the positive plate on a current collector coated by a conducting adhesive and carrying out cold pressing and drying so as to prepare the positive electrode. The invention further relates to the positive electrode prepared by using the method. The all-solid-state lithium ion battery prepared by using the method provided by the invention has the following advantages compared with traditional all-solid-state lithium batteries: since gaps among solid-solid particles of the battery are filled with amorphous sulfide exerting connection and bridging effects, contact areas of the solid-solid particles of the battery are substantially improved, lithium ion transport paths are increased, and thus, conductivity is improved, internal resistance of the battery is reduced, and energy density and rate capability of the battery are enhanced.

Description

technical field [0001] The invention relates to a lithium battery, in particular to a positive electrode of an all-solid lithium battery and a manufacturing method thereof. Background technique [0002] With the recent popularization of portable electronic devices such as smartphones, personal computers, and video cameras, the development and research of secondary lithium batteries that serve as power sources for these devices has attracted increasing attention. In addition, due to the requirements of energy conservation and environmental protection, the development of low-pollution and pollution-free electric vehicles and hybrid vehicles has been included in the national strategic plan, and the secondary lithium battery, one of the core components of electric vehicles and hybrid vehicles, has been developed top priority. However, the current commercially available secondary lithium batteries use organic solvents as organic electrolytes, which are toxic, flammable, and have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/139H01M4/13H01M4/62
CPCY02E60/122H01M4/0471H01M4/13H01M4/139H01M4/624H01M10/052Y02E60/10
Inventor 刘振国
Owner TONGDING INTERCONNECTION INFORMATION CO LTD
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