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An all-solid-state electrolyte, preparation method thereof, and lithium ion battery

An electrolyte, all-solid-state technology, applied in the field of lithium-ion batteries, can solve the problems of reduced charge-discharge capacity and poor cycle performance of all-solid-state batteries, improve interface compatibility and interface stability, excellent adhesion, reduce Effect of risk of short circuit

Active Publication Date: 2022-03-22
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These factors will lead to a decrease in the charge-discharge capacity and cycle performance of all-solid-state batteries.

Method used

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  • An all-solid-state electrolyte, preparation method thereof, and lithium ion battery
  • An all-solid-state electrolyte, preparation method thereof, and lithium ion battery
  • An all-solid-state electrolyte, preparation method thereof, and lithium ion battery

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preparation example Construction

[0071] The present invention also provides a method for preparing any of the above-mentioned all-solid electrolytes, comprising the following steps:

[0072] 1) compressing and drying the first slurry containing the inorganic electrolyte, polymer, and lithium salt to obtain a composite electrolyte functional layer;

[0073] 2) soaking the composite electrolyte functional layer in a surface modifier solution to obtain an intermediate functional layer;

[0074] 3) The first functional layer is provided on the lower surface of the intermediate functional layer, and the second functional layer is provided on the upper surface of the intermediate functional layer.

[0075] In step 1), the first slurry for obtaining the composite electrolyte functional layer is firstly prepared.

[0076] Specifically, the polymer and the lithium salt can be added into the solvent and stirred evenly to obtain an intermediate slurry, and then the inorganic electrolyte can be added to the intermediate...

Embodiment 1

[0105] The all-solid electrolyte of this example was prepared according to the following method:

[0106] 1. PEO, lithium perchlorate (LiClO 4 ) and BMI-TFSI ionic liquid are dissolved in ACN according to the mass ratio of 8:6:1, and stirred evenly at 20°C for 3 hours to form a solution with a solid content of 3%; then add 95% mass based composite electrolyte functional layer to the above solution Proportion of Li 6.6 La 3 Zr 1.6 Ta 0.4 o 12 Inorganic electrolyte powder, stirred evenly, pressed to make the thickness 180 μm, vacuum dried at 100°C for 12 hours, to obtain a composite electrolyte functional layer;

[0107] Soak the above-mentioned composite electrolyte functional layer in methanol dopamine solution for 1 h, and then use a vacuum oven to dry in O 2 Dry at 60°C for 10 hours under the same conditions to obtain the intermediate functional layer;

[0108] 2. PEO, LiClO 4 Dissolve in ACN at a mass ratio of 8:3, stir for 12 hours to form a uniform second slurry, ...

Embodiment 2

[0113] The all-solid electrolyte of this example is prepared according to the following method:

[0114] 1. Combine PVDF-HFP, lithium perchlorate (LiClO 4 ) and BMI-TFSI ionic liquid were dissolved in DMF according to the mass ratio of 6.5:2:1, and stirred evenly at 50°C for 6h; then, Li 6.4 La 3 Zr1.4 Nb 0.6 o 12 Inorganic electrolyte powder, stirred evenly, pressed to make the thickness 80 μm, vacuum dried at 80°C for 12 hours, to obtain a composite electrolyte functional layer;

[0115] Soak the above-mentioned composite electrolyte functional layer in methanol dopamine solution for 1 h, and then use a vacuum oven to dry in O 2 Dry at 80°C for 10 hours under the same conditions to obtain the intermediate functional layer;

[0116] 2. Combine PVDF-HFP, LiFSI, Li 6.4 La 3 Zr 1.4 Nb 0.6 o 12 Dissolve in DMF at a mass ratio of 3:1:0.5, stir for 10 hours until a uniform second slurry is formed, and scrape coat the second slurry on one side of the middle functional laye...

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Abstract

The invention provides an all-solid electrolyte, a preparation method thereof, and a lithium-ion battery. The all-solid electrolyte includes: a first functional layer, an intermediate functional layer, and a second functional layer. The first functional layer is arranged on the lower surface of the intermediate functional layer. The second functional layer is arranged on the upper surface of the intermediate functional layer; wherein, the intermediate functional layer includes a composite electrolyte layer and a modified layer filled inside the composite electrolyte layer and covers the entire upper and lower surfaces of the composite electrolyte layer. The composite electrolyte layer includes an inorganic electrolyte, a polymer substance, lithium salt; the first functional layer and the second functional layer include polymer and lithium salt. The all-solid electrolyte not only has good interfacial stability and interfacial compatibility, but also has high mechanical strength, can well cope with volume strain, reduces the risk of short circuit in battery preparation, and enhances the ability of the electrolyte to suppress lithium dendrites, so it can Effectively improve the cycle performance and charge and discharge capacity of lithium-ion batteries.

Description

technical field [0001] The invention relates to an electrolyte, in particular to an all-solid electrolyte, a preparation method thereof and a lithium ion battery, belonging to the technical field of lithium ion batteries. Background technique [0002] In order to obtain lithium-ion batteries with high safety and high energy density, all-solid-state batteries have entered the public's field of vision. The all-solid-state battery is to replace the electrolyte in the traditional lithium-ion battery with a solid electrolyte, and change the transmission of lithium ions from liquid to solid, thus avoiding potential safety hazards. Moreover, the use of solid electrolyte can reduce the risk of short circuit caused by lithium dendrites, making it possible to use metallic lithium as the anode material of lithium-ion batteries, thereby greatly improving the energy density of lithium-ion batteries. [0003] Solid electrolytes are mainly divided into inorganic solid electrolytes and pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/056H01M10/0525H01M2300/0065Y02E60/10
Inventor 张赵帅赵伟李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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