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Solid-state battery capable of operating at room temperature and preparation method thereof

A technology of solid-state batteries and solid-state electrolyte membranes, which is applied in the manufacture of electrolyte batteries, lithium batteries, secondary batteries, etc., and can solve the problems of difficulty in fully utilizing the actual capacity of solid-state batteries, poor electrode/electrolyte interface compatibility, and thermal management of solid-state batteries. Problems such as high cost, to achieve the effect of suitable for large-scale production, not harsh preparation conditions, and inhibited growth

Active Publication Date: 2019-11-08
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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  • Solid-state battery capable of operating at room temperature and preparation method thereof
  • Solid-state battery capable of operating at room temperature and preparation method thereof
  • Solid-state battery capable of operating at room temperature and preparation method thereof

Examples

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Effect test

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 comprises a positive electrode, a negative electrode and a solid electrolyte membrane. The negative electrode comprises lithium metal and an interface protection film formed on the surface of the lithium metal. The interface protection film is formed bytreating the lithium metal through a treatment solution, wherein the treatment solution comprises solute and solvent, the solute being one or more of lithium difluorophosphate, lithium hexafluorophosphate, lithium difluorobis(oxalato)phosphate and tetrafluoroethylene oxalic acid phosphate lithium, and the solvent is one or more of dimethyl sulfoxide and dimethyl formamide. The solid-state batteryalso comprises a liquid substance dropped onto the solid electrolyte membrane. The liquid substance is one or more of propylene carbonate, r-butyrolactone and ethylene carbonate. The solid-state battery can operate at the room temperature, can reduce heat management cost and improves safety of the solid-state battery; the positive and negative electrode pieces have good compatibility with the solid electrolyte membrane; interface impedance is low; and migration rate of lithium ions is high.

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 Applications(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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