Composite solid electrolyte and lithium ion battery comprising same

A solid electrolyte, lithium ion battery technology, applied in the field of lithium ion batteries

Pending Publication Date: 2021-08-20
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems existing in the existing solid electrolyte, the object of the present invention is to provide a composite solid electrolyte capable of improving grain boundary resistance, stability in air and electrode interface performance

Method used

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  • Composite solid electrolyte and lithium ion battery comprising same
  • Composite solid electrolyte and lithium ion battery comprising same
  • Composite solid electrolyte and lithium ion battery comprising same

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preparation example Construction

[0045]

[0046] As mentioned above, the present invention provides a composite solid-state electrolyte, and here also provides a preparation method of the above-mentioned composite solid-state electrolyte. The preparation method includes the following steps:

[0047] The oxide solid electrolyte, sintering aid, halide and solvent are mixed and sintered to prepare the composite solid electrolyte.

[0048] According to an embodiment of the present invention, the solvent is selected from at least one of deionized water, methanol, ethanol, tetrahydrofuran, dimethyl sulfoxide, acetone, and acetic acid.

[0049] According to an embodiment of the present invention, the halide is defined as above.

[0050] According to the embodiment of the present invention, the definition of the sintering aid is as described above.

[0051] According to an embodiment of the present invention, the oxide solid state electrolyte is a pure phase without the presence of impurity phases.

[0052] Accor...

Embodiment approach

[0055] According to an embodiment of the present invention, the method specifically includes the following steps:

[0056] Mixing oxide solid electrolyte powder, sintering aid, halide and solvent, cold pressing into a sheet, and then sintering to prepare the composite solid electrolyte;

[0057] Alternatively, the oxide solid electrolyte powder and the sintering aid are cold-pressed into sheets, infiltrated into a precursor solution formed by a halide and a solvent, and then sintered to prepare the composite solid electrolyte;

[0058] Alternatively, the oxide solid electrolyte powder is cold-pressed into sheets, soaked in a precursor solution formed by a sintering aid, a halide and a solvent, and then sintered to prepare the composite solid electrolyte.

[0059] Wherein, the pressure of the cold pressing into a sheet is 1-20 MPa.

[0060] Wherein, the mass fraction of the halide in the precursor solution is 1-30 wt%, and the mass fraction of the sintering aid in the precurso...

Embodiment 1

[0088] (1) Preparation of composite solid electrolyte

[0089] For oxide solid electrolyte powder Li 6.6 La 3 Zr 1.6 Ta 0.4 O 12 Drying; dissolving ammonium fluoride in deionized water at a ratio of 16 wt%, and fully stirring at a speed of 200 rpm for 8h to a homogeneous solution;

[0090] Will Li 6.6 La 3 Zr 1.6 Ta 0.4 O 12 The powder, lithium phosphate and ammonium fluoride aqueous solution were thoroughly mixed uniformly in a mass ratio of 87:1:12, then put into a powder tableting die, and pressed under an axial pressure of 8 MPa to form an electrolyte tablet with a thickness of about 200 μm, which was taken out. The electrolyte sheet was allowed to stand for 30 minutes, sintered at 850° C. for 3 hours and then cooled to obtain a composite solid electrolyte, wherein the composite solid electrolyte included oxide solid electrolyte, lithium phosphate and lithium fluoride, and the oxide solid electrolyte accounted for the 96.7 wt % of the total mass of the composite ...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a composite solid electrolyte and a lithium ion battery comprising the same. According to the composite solid electrolyte, impurities on the surface of the oxide solid electrolyte can be eliminated, the oxide solid electrolyte is converted into lithium halide in situ, continuous reaction between the oxide solid electrolyte and water and carbon dioxide in air can be blocked through formation of the lithium halide, and the oxide solid electrolyte is not corroded; the stability of the oxide solid electrolyte in the air is improved; meanwhile, the introduced sintering aid can be filled in gaps among crystal grains of the oxide solid electrolyte, so that the density of the oxide solid electrolyte is improved, the grain boundary resistance of the oxide solid electrolyte is reduced, and the performance of the composite solid electrolyte is further improved.

Description

technical field [0001] The present invention relates to the technical field of lithium ion batteries, in particular to a composite solid electrolyte with high ionic conductivity and a lithium ion battery including the composite solid electrolyte. Background technique [0002] In recent years, among various commercial rechargeable and dischargeable chemical energy storage devices, lithium-ion batteries have the characteristics of high energy density and long service life, and have been widely used in mobile phones, notebook computers, electric vehicles and other fields. At present, most of the electrolytes used in lithium-ion batteries are liquid organic electrolytes, but the characteristics of liquid organic electrolytes are volatile, flammable, and explosive, which seriously affects the safety of lithium-ion batteries during use. [0003] The solid electrolyte has high mechanical strength, excellent density and certain ability to resist the growth of lithium dendrites, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0562H01M10/0525H01M2300/0071Y02E60/10
Inventor 张赵帅赵伟李素丽唐伟超董德锐高云智
Owner ZHUHAI COSMX BATTERY CO LTD
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