A solid-state battery capable of operating at room temperature and its preparation method

A solid-state battery, solid-state electrolyte membrane technology, applied in the manufacture of electrolyte batteries, lithium batteries, secondary batteries, etc., can solve the problem that the actual capacity of solid-state batteries is difficult to fully exert, the electrode/electrolyte interface compatibility is poor, and the interface impedance affects ions. Transmission and other issues, to achieve the effect of being suitable for large-scale production, not harsh preparation conditions, and reducing thermal management costs

Active Publication Date: 2021-07-16
宁德国泰华荣新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there is basically no side reaction of solid electrolyte decomposition at the interface between the solid electrolyte and the electrode material, the solid properties make the electrode / electrolyte interface compatibility poor, and the high interface impedance seriously affects the ion transmission, which ultimately leads to the difficulty in the actual capacity of the solid-state battery. fully play
[0004] In order to solve the high interface impedance of solid-state batteries, in the prior art, solid-state batteries usually operate at high temperatures (generally 60°C), that is, charge and discharge at high temperatures, which makes the thermal management cost of solid-state batteries high

Method used

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  • A solid-state battery capable of operating at room temperature and its preparation method
  • A solid-state battery capable of operating at room temperature and its preparation method
  • A solid-state battery capable of operating at room temperature and its preparation method

Examples

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Embodiment 1

[0032] Embodiment 1, a preparation method of a solid-state battery capable of operating at room temperature:

[0033] In a dry room (humidity <5%), weigh lithium difluorophosphate and dissolve it in DMSO, the concentration of lithium difluorophosphate is 0.06M, add water remover hexamethyldisilazane 50ppm, stir to form a homogeneous solution, Soak the metal lithium sheet in it at room temperature for 5 minutes, take it out with tweezers, stick off the floating liquid on the surface of the lithium sheet on a dust-free paper, and obtain sample A.

[0034] Take the positive electrode sheet coated with a solid electrolyte membrane, wherein the mass of the solid electrolyte membrane is 0.02g, and after baking in a vacuum oven at 30°C for 20min, the solid electrolyte membrane is in a softened state, and 0.002g of liquid state Propylene carbonate was added dropwise on the solid electrolyte membrane of the positive electrode sheet to obtain sample B.

[0035] Assemble a button-type a...

Embodiment 2

[0037] Embodiment 2, a preparation method of a solid-state battery capable of operating at room temperature:

[0038] Other conditions are identical with embodiment 1, and difference is that soaking time improves to 10min.

[0039] Use Xinwei test equipment to conduct charge and discharge tests on solid-state batteries at room temperature. The test results are shown in Table 1-1.

Embodiment 3

[0040] Embodiment 3, a preparation method of a solid-state battery capable of operating at room temperature:

[0041] Other conditions are identical with embodiment 1, and difference is that soaking time improves to 30min.

[0042] Use Xinwei test equipment to conduct charge and discharge tests on solid-state batteries at room temperature. The test results are shown in Table 1-1.

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Abstract

The invention relates to a solid-state battery capable of operating at room temperature and a preparation method thereof. The solid-state battery includes a positive electrode, a negative electrode, and a solid electrolyte film. The negative electrode includes metal lithium and an interface protection film formed on the surface of the metal lithium. The interface protection film processes the metal through a treatment solution. Lithium is formed, the treatment liquid includes a solute and a solvent, the solute is one or more combinations of lithium difluorophosphate, lithium hexafluorophosphate, lithium difluorobis(oxalato)phosphate, and lithium tetrafluorooxalate phosphate, and the solvent is dimethyl sulfoxide One or more of dimethylformamide; solid-state batteries also include liquid substances dripped on the solid electrolyte membrane, and the liquid substances are one or more of propylene carbonate, r-butyrolactone, and ethylene carbonate. Various combinations. The solid-state battery of the present invention can operate at room temperature, thereby reducing thermal management costs and improving the safety of the solid-state battery; the positive and negative electrodes have good compatibility with the solid-state electrolyte membrane, low interface impedance, and high lithium ion migration rate.

Description

technical field [0001] The invention belongs to the field of new energy, and in particular relates to a solid-state battery capable of operating at room temperature and a preparation method thereof. Background technique [0002] At present, commercial lithium-ion batteries generally use organic liquid electrolytes and gel electrolytes, which inevitably introduce volatile, flammable, and explosive organic liquids into the battery system, which brings serious safety hazards to the battery system. Therefore, replacing the electrolyte with a solid electrolyte and developing an all-solid-state lithium-ion battery is the only way to fundamentally solve the safety problem. The structure of the all-solid-state battery includes a positive electrode, a solid-state electrolyte, and a negative electrode. The solid-state electrolyte acts as a separator to hinder electron transmission while conducting lithium ions, which greatly simplifies the battery construction process. [0003] In ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/052H01M10/0525H01M10/058H01M10/0565
CPCH01M10/052H01M10/0525H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 尤春琴甘朝伦王峰徐凯辰钱雨涛赵世勇
Owner 宁德国泰华荣新材料有限公司
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