In-situ composite solid electrolyte, application thereof, all-solid-state battery and preparation method thereof

A solid-state electrolyte and all-solid-state battery technology, which is applied in the field of lithium-ion batteries, can solve the problems of unfavorable process amplification and preparation, and poor ion transmission channels.

Active Publication Date: 2018-09-18
BEIJING WELION NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, since the solid electrolyte does not have the wetting effect of the liquid, the solid particles in the positive electrode layer, the electrolyte layer and the negative electrode layer of the solid battery are in point contact, and the gaps between the particles can easily cause the ion transmission channel in the battery system to be blocked.
Secondly, ...

Method used

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Examples

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Effect test

preparation example Construction

[0034] The present invention also provides a method for preparing the above-mentioned all-solid-state battery, comprising: S1) mixing lithium salts, additives and initiators to obtain a mixed solution; the additives are small molecular monomers containing unsaturated bonds; S2) mixing The mixed solution is in-situ polymerized and bonded in the positive electrode layer, the solid electrolyte layer and the negative electrode layer and between the layers to obtain an all-solid battery; the solid electrolyte layer includes an inorganic solid electrolyte and a binder.

[0035] The present invention has no special limitation on the sources of all raw materials, which can be commercially available.

[0036] Mix the lithium salt, the additive and the initiator, preferably first mix the lithium salt and the additive, and then add the initiator to obtain a mixed solution; the mixing is preferably carried out under the protection of an inert gas; the inert gas is a technology in the art ...

Embodiment 1

[0042] Under an argon protective atmosphere, add 5% lithium hexafluorophosphate to vinyl sulfite, stir evenly, then add 0.5% azobisisobutyronitrile into the solution, and mix evenly to obtain a mixed solution.

[0043] The mixed solution is added to lithium cobaltate as positive pole, lithium metal as negative pole, containing Li 7 La 3 Zr 2 o 12 and polyvinylidene fluoride (mass ratio is 7 / 3) as the all-solid-state battery of the electrolyte layer, wherein the solid-state electrolyte layer accounts for 50% of the total mass of the all-solid-state battery; 10%, and then the all-solid-state battery was left at 40° C. for 4 hours to obtain an all-solid-state battery in which vinyl vinyl sulfite was polymerized and cured in situ.

[0044] The performance of the all-solid-state battery obtained by in-situ polymerization and curing of vinyl vinyl sulfite obtained in Example 1 was tested, and the results obtained are shown in Table 1.

[0045] Table 1 Test results of internal re...

Embodiment 2

[0048] Under an argon protective atmosphere, add 10% by mass fraction of lithium bistrifluoromethanesulfonimide to ethylene carbonate, stir evenly, then add 3% by mass fraction of benzoyl peroxide to the solution, mix Evenly, a mixture is obtained.

[0049] The mixed solution is added to the ternary nickel-cobalt-manganese as the positive electrode, graphite as the negative electrode, containing Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 and polyethylene oxide (mass ratio 9 / 1) as the all-solid-state battery of the electrolyte layer, wherein the solid-state electrolyte layer accounts for 20% of the total mass of the all-solid-state battery; after adding the mixed solution, the mixed solution accounts for 3% of the total battery weight, and then The all-solid-state battery was left standing at 60° C. for 5 hours to obtain an all-solid-state battery in which vinylene trithiocarbonate was polymerized and solidified in situ.

[0050] The performance of the all-solid-state battery obtained...

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PUM

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Abstract

The invention provides a preparation method for an all-solid-state battery. The method comprises the steps of S1, mixing lithium salt, additive and initiator to obtain mixed solution, wherein the additive is micromolecule monomer comprising unsaturated bond; and S2, carrying out in-situ polymerization and adhesion by the solution in a cathode layer, a solid electrolyte layer and an anode layer andamong the layers, thereby obtaining composite solid electrolyte, wherein a solid electrolyte layer comprises inorganic solid electrolyte and adhesive. Compared with the prior art, the method has theadvantages that through utilization of flowability of the micromolecule monomer additive comprising the unsaturated bond, solid particles are wetted sufficiently, ion transport channels are constructed through in-situ polymerization and solidification, electrode layers are adhered once, and a battery is moulded; the compatibility of the solid-solid interface in the all-solid-state battery can be effectively improved; and the preparation method is simple and fast, is compatible with the existing battery technology and is beneficial for large-scale preparation.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an in-situ composite solid electrolyte and its application, an all-solid battery and a preparation method thereof. Background technique [0002] In recent years, the rapidly developing electric vehicle and energy storage industries have put forward higher requirements on the energy density, cost, cycle and safety of secondary batteries represented by lithium-ion batteries. Traditional liquid electrolytes have safety problems such as leakage, fire, and explosion, which seriously hinder the further development of lithium-ion batteries. The all-solid-state lithium battery, which replaces the organic liquid electrolyte with a solid electrolyte, is expected to fundamentally solve the safety problem of the battery, and at the same time improve the energy density of the battery, so it has become a research hotspot. [0003] In recent years, the research on sol...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 李久铭黄杰俞会根李泓
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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