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Method for improving storage stability of solid electrolyte material, material and application

A solid electrolyte and storage stability technology, applied in the field of materials, can solve the problems of affecting battery performance, increasing the moisture content of solid electrolyte, and the specific surface area is easy to attach moisture, etc., to achieve the effect of extending the shelf life, low cost of use, and improving storage stability

Pending Publication Date: 2022-04-29
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the solid electrolyte contains hydrophilic groups, it is easy to absorb water, and because the solid electrolyte powder has a small particle size, its specific surface area is large and easy to attach water. In addition, the pore structure of the solid electrolyte powder will also absorb water, making the solid electrolyte Moisture content increases during storage
[0005] Lithium-ion batteries are a relatively complex chemical system. The reaction process and results of these chemical systems are closely related to moisture. Moisture is brought into the battery through the state electrolyte, which will affect the internal resistance and cycle life of the battery. Thus affecting the performance of lithium-ion batteries, it is necessary to find a reliable method to control the solid-state electrolyte to absorb moisture in the storage environment, so as to avoid absorbing moisture during storage and affecting the performance of the battery

Method used

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  • Method for improving storage stability of solid electrolyte material, material and application
  • Method for improving storage stability of solid electrolyte material, material and application
  • Method for improving storage stability of solid electrolyte material, material and application

Examples

Experimental program
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Effect test

Embodiment 1

[0043] This example provides a method for preparing a solid electrolyte material coated with a polymer layer on the surface, and the specific steps are:

[0044] Weigh the NASICON solid electrolyte material Li with a particle size of 2 μm at a mass ratio of 1:0.06 1.2 Al 0.2 Ti 1.8 (PO 4 ) 3 and polyvinylidene fluoride, added to a stirrer and thoroughly mixed for 1 hour, and mixed evenly to obtain a raw material complex.

[0045]The raw material complex was placed in a box furnace, heated to 200°C at a rate of 2°C / min, kept for 5 hours, and then naturally lowered to room temperature to obtain a solid electrolyte material coated with a polymer layer on the surface.

[0046] figure 2 The SEM of the solid electrolyte material coated with a polymer layer was prepared for this example. It can be seen that the surface of the solid electrolyte material has a lamellar structure, which is the polymer layer coated on the surface of the solid electrolyte material.

[0047] Water c...

Embodiment 2

[0054] This embodiment provides a method for preparing a solid electrolyte material coated with a polymer layer on the surface, and the specific steps are:

[0055] Weigh the garnet-type solid electrolyte material Li with a particle size of 5 μm at a mass ratio of 1:0.1 7 Ca 3 Ta 2 o 12 and polyvinylidene fluoride, added to a ball mill and mixed thoroughly for 1 hour, and mixed evenly to obtain a raw material complex.

[0056] The raw material complex was placed in a tube furnace, and the temperature was raised to 230°C at a rate of 2°C / min, kept for 4 hours, and then naturally lowered to room temperature to obtain a solid electrolyte material coated with a polymer layer on the surface.

[0057] image 3 It is the volume particle size distribution curve of the solid electrolyte material in this example before and after coating the polymer. It can be seen from the figure that the average particle diameter D50 of the solid electrolyte after the polymer coating is 6 μm, and t...

Embodiment 3

[0065] This embodiment provides a method for preparing a solid electrolyte material coated with a polymer layer on the surface, and the specific steps are:

[0066] Weigh the NASICON type solid electrolyte material Li with a particle size of 2 μm at a mass ratio of 1:0.05 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 and polytetrafluoroethylene, added into a ball mill and mixed thoroughly for 1 hour, and mixed evenly to obtain a raw material complex.

[0067] The raw material complexes were placed in a tube furnace, and the temperature was raised to 280°C at a rate of 2°C / min, kept for 2 hours, and then naturally lowered to room temperature to obtain a solid electrolyte material coated with a polymer layer on the surface.

[0068] Figure 4 The XRD patterns of the solid electrolyte material used in this example before and after polymer coating, from the comparison of the characteristic peaks in the figure, it can be seen that the polymer coating will not affect the structure of the origina...

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Abstract

The invention discloses a method for improving the storage stability of a solid electrolyte material, the material and application. The method comprises the following steps: preparing a polymer layer on the surface of the solid electrolyte material; and the material for forming the polymer layer comprises polyvinylidene fluoride and / or polytetrafluoroethylene. According to the method for improving the storage stability of the solid electrolyte material, the surface of the solid electrolyte material is coated with a layer of hydrophobic polymer to isolate the solid electrolyte material from moisture in the environment, so that the whole solid electrolyte material reaches a state capable of keeping low moisture for a long time, and the storage and use cost of the solid electrolyte material is lower; and the shelf life of the solid electrolyte material is prolonged.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a method, material and application for improving the storage stability of solid electrolyte materials. Background technique [0002] Lithium-ion battery is a secondary battery that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. [0003] At present, the rapid development of new energy vehicles, large-scale energy storage power stations and micro devices has put forward higher requirements for the energy density, power density, working environment and safety of secondary batteries. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0562H01M10/0525
CPCH01M10/058H01M10/0562H01M10/0525H01M2300/0094Y02P70/50
Inventor 石永明史晶罗飞陶翔
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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