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Preparation method of composite electrolyte layer and solid state battery

A technology of composite electrolyte and solid electrolyte, which is applied in the field of preparation of composite electrolyte layer, can solve the problems of non-recyclable, low utilization rate, and stripes on pole pieces, etc., and achieve the effect of improving utilization rate and high production efficiency

Active Publication Date: 2019-06-07
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since solvents need to be added to dissolve the solid electrolyte during the preparation of electrolyte slurry, most of them will use highly toxic oily solvents, which will not only pollute the environment, but also cause great harm to human health.
Moreover, during the coating process, the solvent contained in the electrolyte slurry is easy to volatilize, causing the viscosity of the slurry to change, thereby affecting the consistency of the pole piece; part of the slurry is easy to deposit at the corners of the coating head, resulting in extreme Stripes and other appearance defects occur when the sheet is coated; the slurry leaked from the side seam of the trough of the coating head cannot be recycled, resulting in waste of slurry and low utilization rate

Method used

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  • Preparation method of composite electrolyte layer and solid state battery
  • Preparation method of composite electrolyte layer and solid state battery
  • Preparation method of composite electrolyte layer and solid state battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1. Powder mixing

[0027] According to the mass ratio of inorganic solid electrolyte powder: organic polymer powder = 20:1, add it to the VC high-efficiency mixer and mix evenly.

[0028] Step 2. Spraying

[0029] Put the uniformly mixed composite electrolyte powder in step 1 into the electrostatic powder spraying equipment, and spray it on the negative electrode sheet. Spraying process parameters: electrostatic spraying voltage 70KV, distance between spray gun mouth and pole piece 150mm, spraying angle 90°.

[0030] Step three, heat treatment

[0031] The negative electrode sheet in step 2 was subjected to hot isostatic pressing, the temperature of the hot isostatic pressing was 100°C, the hot pressing pressure was 0.3 MPa, and the hot pressing time was 15 minutes, and it was naturally cooled to obtain the following figure 1 structure shown.

[0032] Step 4. Battery Assembly

[0033] The negative electrode sheet with the composite electrolyte layer in step 3 ...

Embodiment 2

[0042] The difference between this embodiment and Embodiment 1 is that the inorganic solid electrolyte powder is LiTi 2 (PO 4 ) 3 , The organic polymer powder is polyvinylidene fluoride-hexafluoropropylene copolymer.

Embodiment 3

[0044] Step 1. Powder mixing

[0045] According to the mass ratio of inorganic solid electrolyte powder: organic polymer powder = 15:1, it is added into a VC high-efficiency mixer and mixed evenly to obtain a composite mixture. The inorganic electrolyte powder uses NASICON type Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 , The organic polymer powder is made of polyethylene oxide.

[0046] Step 2. Spraying

[0047] Put the uniformly mixed composite electrolyte powder in step 1 into the electrostatic powder spraying equipment, and spray it on the positive electrode sheet. Spraying process parameters: electrostatic spraying voltage 60KV, distance between spray gun mouth and pole piece 150mm, spraying angle 90°.

[0048] Step three, heat treatment

[0049] Put the positive electrode sheet in step 2 into an oven and keep it warm at 70°C for 20 minutes to melt the composite electrolyte powder, take it out, and put it in a nitrogen environment to cool naturally.

[0050] Step 4. Battery ...

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Abstract

The present invention discloses a preparation method of a composite electrolyte layer, and relates to the field of solid state batteries. The method comprises the following steps of: S1, uniformly mixing an inorganic solid electrolyte powder body and an organic polymer powder body according to a mass ratio to obtain a composite electrolyte powder body; S2, uniformly spraying the composite electrolyte powder body obtained in the S1 through an electrostatic powder spraying device to a positive plate and / or a negative plate; and S3: performing heat treatment of the positive plate and / or the negative plate after spraying, taking out the positive plate and / or the negative plate for natural cooling. According to the technical scheme, the use of an organic solvent is omitted to improve the effecton environmental protection, and the produced composite electrolyte powder is high in binding with an electrode plate, high in capacities of resistance to chemical attack and resistance to high temperature, and is suitable for large-scale production. Besides, the produced solid state battery is small in internal resistance.

Description

technical field [0001] The invention relates to the field of solid-state batteries, in particular to a preparation method of a composite electrolyte layer and a solid-state battery. Background technique [0002] At present, the common electrolyte materials in lithium-ion batteries are flammable liquid electrolytes such as esters and ethers. There is a risk of environmental pollution caused by liquid leakage, and there is also a potential safety hazard of combustion or even explosion. Solid-state batteries solve the safety problem of lithium-ion batteries to a certain extent by using solid-state electrolytes instead of organic electrolytes. However, in the current production process of solid-state batteries, the solid-state electrolyte layer is mainly mixed by a wet-mixing process, and then prepared by coating or sintering, that is, the slurry in which the solid-state electrolyte and binder and other components are dissolved in a solvent is coated on the pole piece or Sinter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0562H01M10/0565H01M10/0525
CPCY02P70/50
Inventor 林久杨杰华聪聪许晓雄
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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