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Positive pole piece and solid-state battery comprising same

A positive pole piece and solid-state electrolyte technology, applied in the field of solid-state batteries, can solve problems such as high interface impedance, poor contact tightness, and small contact area, and achieve excellent cycle performance, improve interface impedance, and good interface contact performance.

Pending Publication Date: 2021-12-31
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then, the traditional way of contacting the positive and negative electrodes with the liquid electrolyte is liquid / solid contact, and the interfacial wetting performance is good. In contrast, the contact between the solid electrolyte and the positive and negative electrodes is in the form of a solid-solid interface, and the contact area is small. The tightness of contact with the pole piece is poor, the interface impedance is high, and the transmission of lithium ions between the interfaces is hindered

Method used

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  • Positive pole piece and solid-state battery comprising same
  • Positive pole piece and solid-state battery comprising same
  • Positive pole piece and solid-state battery comprising same

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preparation example Construction

[0072] The present invention does not limit the preparation method of the positive pole piece. In the first optional embodiment, the positive pole piece of the present invention can be prepared by the following method:

[0073]The positive electrode slurry is obtained by mixing the positive electrode active material, polymer monomer, conductive agent, lithium salt, initiator and solvent to initiate polymerization; the positive electrode slurry is coated on one or two functional surfaces of the positive electrode current collector, and after After drying treatment, the positive electrode sheet is prepared.

[0074] In the second optional embodiment, the positive electrode sheet of the present invention can be prepared by the following method:

[0075] Mixing polymer monomers and initiators and initiating a polymerization reaction to prepare a polymer; mixing the prepared polymer, positive electrode active material, conductive agent, lithium salt and a second solvent to obtain a...

Embodiment 1

[0088] The preparation method of the solid-state battery of this embodiment includes the following steps:

[0089] 1) Preparation of positive electrode sheet

[0090] The preparation method of positive pole piece comprises the following steps:

[0091] S1: Add the raw materials for the first monomer preparation into dimethyl sulfoxide to fully react to obtain the first monomer, then add the first monomer and the second monomer to the polymerization solvent and mix them uniformly, then add the initiator and mix them to initiate Polymerization reaction to obtain polymer.

[0092] S2: Mix and disperse the positive electrode active material, polymer, lithium salt, auxiliary agent, conductive agent, binder, etc. in the solvent to obtain the positive electrode slurry; apply the positive electrode slurry on the two functional surfaces of the aluminum foil, and bake at 100°C After drying for 24 hours, rolling and cutting, the positive electrode sheet was obtained.

[0093] 2) Prepa...

Embodiment 2

[0104] The preparation method of the solid-state battery of this embodiment includes the following steps:

[0105] 1) Preparation of positive electrode sheet

[0106] The preparation method of positive pole piece comprises the following steps:

[0107] Mix and disperse the positive electrode active material, polymer monomer, initiator, lithium salt, auxiliary agent, conductive agent, and binder in the solvent to obtain the positive electrode slurry; apply the positive electrode slurry on the two functional surfaces of the aluminum foil, 55 After polymerization for 3 hours at °C, the positive electrode slurry was dried at 100 °C for 24 hours to obtain a positive electrode sheet.

[0108] 2) Preparation of negative electrode sheet

[0109] The 50 micron copper-based composite lithium provided by Tianjin Zhongneng Lithium Industry Co., Ltd. is used as the negative electrode, in which the thickness of the copper foil is 10 microns, and the lithium layer is 20 microns;

[0110] ...

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Abstract

The invention provides a positive pole piece and a solid-state battery comprising the same. The positive pole piece comprises a solid electrolyte, the solid electrolyte comprises a polymer, the polymer comprises a structural unit from an olefin compound containing a substituted or unsubstituted ureido group, and the olefin compound further comprises at least one cyclic group. According to the positive pole piece disclosed by the invention, the composition of the polymer in the positive pole piece is limited, so that the interface impedance between the positive pole piece and the solid electrolyte can be effectively improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a positive pole piece and a solid-state battery including the positive pole piece. Background technique [0002] Compared with traditional liquid lithium-ion batteries, the most prominent advantage of solid-state batteries is their safety. Solid-state batteries have the characteristics of non-flammability, high temperature resistance, corrosion resistance, and non-volatility, which can prevent electrolyte leakage in traditional lithium-ion batteries. Short circuit and other phenomena greatly improve the safety performance of the battery. Then, the traditional way of contacting the positive and negative electrodes with the liquid electrolyte is liquid / solid contact, and the interfacial wetting performance is good. In contrast, the contact between the solid electrolyte and the positive and negative electrodes is in the form of a solid-solid interface, and the contact area is smal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0565H01M10/0525H01M2300/0082H01M2004/028Y02E60/10
Inventor 李素丽夏定国唐伟超赵伟李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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