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Sulfide solid electrolyte layer, preparation method thereof and lithium ion battery

A solid electrolyte, sulfide technology, applied in the direction of electrolyte, electrolyte immobilization/gelation, secondary battery, etc., can solve the problems to be improved, limited solvent range, difficult to recycle, etc.

Pending Publication Date: 2022-04-26
XIAMEN HAICHEN NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the instability of the sulfide solid electrolyte itself, and the limited range of solvents that can be selected, and most of them are difficult to recycle and have high toxicity, it is still not the best solution.
[0005] In summary, the existing methods for preparing sulfide solid electrolyte layers still need to be improved.

Method used

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  • Sulfide solid electrolyte layer, preparation method thereof and lithium ion battery
  • Sulfide solid electrolyte layer, preparation method thereof and lithium ion battery
  • Sulfide solid electrolyte layer, preparation method thereof and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0046] refer to figure 1 and 2 , the refined sulfide solid electrolyte Li with an average particle size of 1 μm 6 P.S. 5 Cl, lithium salt LiTFSI, and thermoplastic polymer powder polyvinylidene fluoride-hexafluoropropylene were mixed for 60 minutes according to the mass ratio of 10:1:1.1, dispersed to a suspended state by high-pressure argon, and sprayed onto the positive electrode sheet by electrostatic spray gun. Form the solid electrolyte primary coating, then set the roll temperature to 200°C, the rolling speed to 50cm / min, and roll the solid electrolyte primary coating under the condition of 0 rolling pressure to complete the preparation of the solid electrolyte layer. A composite pole piece formed with a sulfide solid electrolyte layer is obtained.

Embodiment 2

[0048] The refined sulfide solid electrolyte Li with an average particle size of 1 μm 6 P.S. 5 Cl, lithium salt LiTFSI, and thermoplastic polymer powder polyvinylidene fluoride-hexafluoropropylene were mixed for 60 minutes according to the mass ratio of 10:1:1.1, dispersed to a suspended state by high-pressure argon, and sprayed onto the positive electrode sheet by electrostatic spray gun. Form the solid electrolyte primary coating, then set the roll temperature to 200°C, the rolling speed to 50cm / min, and roll the solid electrolyte primary coating under the condition of a rolling pressure of 30MPa to complete the preparation of the solid electrolyte layer. A composite pole piece formed with a sulfide solid electrolyte layer is obtained.

Embodiment 3

[0050] The refined sulfide solid electrolyte Li with an average particle size of 1 μm 6 P.S. 5 Cl, lithium salt LiTFSI, and thermoplastic polymer powder polyvinylidene fluoride-hexafluoropropylene were mixed for 60 minutes according to the mass ratio of 10:1:1.1, dispersed to a suspended state by high-pressure argon, and sprayed onto the positive electrode sheet by electrostatic spray gun. Form the solid electrolyte primary coating, then set the roll temperature to 200°C, the rolling speed to 50cm / min, and roll the solid electrolyte primary coating under the condition of a rolling pressure of 60MPa to complete the preparation of the solid electrolyte layer. A composite pole piece formed with a sulfide solid electrolyte layer is obtained.

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Abstract

The invention discloses a sulfide solid electrolyte layer, a preparation method thereof and a lithium ion battery. The method for preparing the sulfide solid electrolyte layer comprises the following steps: (1) providing a pole piece; (2) forming a sulfide solid electrolyte primary coating on at least part of the surface of the pole piece based on the mixed powder; the mixed powder comprises sulfide solid electrolyte powder, lithium salt powder and thermosensitive polymer powder; and (3) carrying out hot rolling on the sulfide solid electrolyte primary coating to obtain the sulfide solid electrolyte layer. According to the method, no solvent is used in the whole process, and the problem that the ionic conductivity is reduced due to the reaction of the solvent and the sulfide solid electrolyte can be avoided, so that the cycle performance of the battery can be improved, and large-scale production is easy to realize.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage equipment, in particular, the invention relates to a method for preparing a sulfide solid electrolyte layer, a sulfide solid electrolyte layer and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in many fields such as consumer electronics, power vehicles, and large-scale energy storage. However, due to the easy leakage and flammability of the electrolyte, the existing lithium-ion battery positive and negative electrodes and liquid electrolyte systems have reached the bottleneck of energy density. Power batteries are facing two major problems: poor safety and low energy density. The use of non-combustible solid electrolytes instead of commercial electrolytes can fundamentally ensure the safety of lithium-ion batteries; dendrites), which can greatly increase the energy density of the battery. Among the three systems (polymers, oxides, and sul...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/056H01M10/0525H01M2300/0085H01M2300/0091Y02E60/10
Inventor 黄汉川
Owner XIAMEN HAICHEN NEW ENERGY TECH CO LTD
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