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Gel composite positive pole plate, preparation method thereof and method for preparing all-solid-state lithium battery

A technology of composite positive electrode and positive electrode sheet, which is applied in the direction of lithium battery, electrode manufacturing, battery electrode, etc., can solve the problems of positive electrode sheet and solid electrolyte interface impedance, etc., achieve high active material content, improve interface impedance, and excellent performance.

Active Publication Date: 2018-01-16
QINGTAO KUNSHAN ENERGY DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to provide a gel composite positive electrode sheet to solve the interface impedance problem between the positive electrode sheet and the solid electrolyte in the solid-state battery

Method used

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  • Gel composite positive pole plate, preparation method thereof and method for preparing all-solid-state lithium battery
  • Gel composite positive pole plate, preparation method thereof and method for preparing all-solid-state lithium battery
  • Gel composite positive pole plate, preparation method thereof and method for preparing all-solid-state lithium battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Prepare the gel electrolyte: obtain 1.5% polymer monomer by mass percentage; 0.1% initiator; 2.5% cross-linking agent; and the balance of electrolyte stock solution. In this embodiment, the polymer monomer is methyl methacrylate, the initiator is azobisisobutyronitrile; the crosslinking agent is polyethylene glycol acrylate, and the electrolyte stock solution is lithium The carbonate organic matter solution of the salt, specifically lithium hexafluorophosphate solution, has a concentration of 0.8 mol / L. Add the methyl methacrylate, azobisisobutyronitrile and polyethylene glycol acrylate into the lithium hexafluorophosphate, mix and dissolve thoroughly to obtain a gel electrolyte.

[0056] Step S1) prepare slurry:

[0057] The raw materials of the slurry are obtained by mass percentage: 4% of the binder, 4% of the conductive agent and the remaining active material of the positive electrode. The binder is polyvinylidene fluoride, the conductive agent is carbon nanotube,...

Embodiment 2

[0067] Prepare the gel electrolyte: obtain 2.5% polymer monomer by mass percentage; 0.1% initiator; 5% cross-linking agent; and the balance of electrolyte stock solution. In this embodiment, the polymer monomer is butyl acrylate, the initiator is azobisisobutyronitrile; the crosslinking agent is polyethylene glycol acrylate, and the electrolyte stock solution is lithium salt The organic carbonate solution, specifically lithium perchlorate solution, has a concentration of 0.8 mol / L. Add the butyl acrylate, azobisisobutyronitrile and polyethylene glycol acrylate into the lithium perchlorate, mix and dissolve thoroughly to obtain a gel electrolyte.

[0068] Step S1) prepare slurry:

[0069] The raw materials of the slurry are obtained by mass percentage: 8% of binder, 4% of conductive agent and the remaining positive electrode active material. The binder is polyvinylidene fluoride, the conductive agent is conductive carbon black, and the positive electrode active material is li...

Embodiment 3

[0079] Prepare the gel electrolyte: obtain 4% of the polymer monomer by mass percentage; 0.2% of the initiator; 5% of the cross-linking agent; and the balance of the electrolyte stock solution. In this embodiment, the polymer monomer is triethylene glycol diacrylate, the initiator is azobisisobutyronitrile; the polyethylene glycol methyl acrylate; the electrolyte stock solution is lithium salt Carbonate organic matter solution, specifically lithium perchlorate solution, its concentration is 1.0mol / L. Add the triethylene glycol diacrylate, azobisisobutyronitrile and polyethylene glycol methyl acrylate into the lithium perchlorate, mix and dissolve to obtain a gel electrolyte.

[0080] Step S1) prepare slurry:

[0081] The raw materials of the slurry are obtained by mass percentage: 8% of binder, 8% of conductive agent and the remaining positive electrode active material. The binder is polyvinylidene fluoride, the conductive agent is conductive carbon black, and the positive e...

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Abstract

The invention discloses a gel composite positive pole plate. The gel composite positive pole plate is characterized by comprising a positive active substance, a conductive agent, a gel electrolyte, abinding agent and a current collector, wherein the binding agent, the conductive agent, the gel electrolyte and the positive active substance form a layered structure on a surface of the current collector, and the conductive agent and the gel electrolyte are uniformly dispersed in the positive active substrate and are associated via the binding agent. The invention also discloses a method for preparing the gel composite positive pole plate and a method for preparing an all-solid-state lithium battery.

Description

technical field [0001] The invention relates to the field of lithium batteries and the like, in particular to a gel composite positive electrode sheet, a preparation method thereof, and a method for preparing an all-solid lithium battery. Background technique [0002] Lithium-ion batteries have been widely used in the fields of transportation and energy storage, and people are eager to develop lithium-ion secondary batteries with high energy density. For the further achievement of the goal of higher energy density, lithium metal batteries with metal lithium as the negative electrode have become an inevitable choice. This is because the capacity of lithium metal is 3860mAh / g, which is about 10 times that of graphite. Since it is a lithium source, the selection of positive electrode materials is wide; but due to the "lithium dendrite" phenomenon in liquid batteries, it does not Lithium batteries are widely used. In addition, a series of lithium battery explosion news exposed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/139H01M4/04H01M10/052
CPCY02E60/10
Inventor 冯玉川李峥何泓材何朝凌张博杨帆南策文
Owner QINGTAO KUNSHAN ENERGY DEV CO LTD
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