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A preparation method of composite positive electrode with polymer added and its application in solid-state batteries

A composite positive electrode and solid-state battery technology, which is applied in the manufacture of secondary batteries, solid electrolytes, and electrolyte batteries, etc., can solve problems such as battery safety hazards, and achieve the advantages of inhibiting the formation of crystallization, wide liquid range, and large polarity controllability Effect

Active Publication Date: 2020-10-09
QINGTAO KUNSHAN ENERGY DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The battery of this system has certain potential safety hazards

Method used

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  • A preparation method of composite positive electrode with polymer added and its application in solid-state batteries
  • A preparation method of composite positive electrode with polymer added and its application in solid-state batteries
  • A preparation method of composite positive electrode with polymer added and its application in solid-state batteries

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Effect test

Embodiment 1

[0028] A method for preparing a composite positive electrode with polymer added and its application in solid-state batteries, the composite positive electrode includes a composite positive electrode sheet and a solid electrolyte material, the composite positive electrode sheet includes a positive electrode active material, an additive, a conductive agent and an adhesive The solid electrolyte material is composed of a high molecular polymer containing long chain segments, a lithium salt that reacts with the high molecular polymer, and a lithium ion conductor.

[0029] The additive is prepared by mixing thermoplastic polyurethane and polyethylene oxide in the N-methylpyrrolidone solution at a ratio of 20%-50%.

[0030] The lithium ion conductor is 200-300 nanometer Li 7 La 3 m 2 o 12 , M is one or more of Zr and Ta.

[0031] A method for preparing a composite positive electrode with polymer addition and its application in solid-state batteries, including the steps of prepari...

Embodiment 2

[0041] A method for preparing a composite positive electrode with polymer added and its application in solid-state batteries, the composite positive electrode includes a composite positive electrode sheet and a solid electrolyte material, the composite positive electrode sheet includes a positive electrode active material, an additive, a conductive agent and an adhesive The solid electrolyte material is composed of a high molecular polymer containing long chain segments, a lithium salt that reacts with the high molecular polymer, and a lithium ion conductor.

[0042] The additive is prepared by mixing polymethyl methacrylate and polyethylene oxide at a ratio of 20%-50% in N-methylpyrrolidone solution.

[0043] The lithium ion conductor is 200-300 nanometer Li 7 La 3 m 2 o 12 , M is one or more of Zr and Ta.

[0044] A method for preparing a composite positive electrode with polymer addition and its application in solid-state batteries, including the steps of preparing the ...

Embodiment 3

[0054] A method for preparing a composite positive electrode with polymer added and its application in solid-state batteries, the composite positive electrode includes a composite positive electrode sheet and a solid electrolyte material, the composite positive electrode sheet includes a positive electrode active material, an additive, a conductive agent and an adhesive The solid electrolyte material is composed of a high molecular polymer containing a long chain segment, a lithium salt that reacts with the high molecular polymer, and a fast ion conductor.

[0055] The additive is prepared by mixing polyethylene oxide and polyvinylpyridine at a ratio of 20%-50% in N-methylpyrrolidone solution.

[0056] The lithium ion conductor is 200-300 nanometer Li 7 La 3 m 2 o 12 , M is one or more of Zr and Ta.

[0057] A method for preparing a composite positive electrode with polymer addition and its application in solid-state batteries, including the steps of preparing the positive...

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Abstract

The invention discloses a preparation method of a polymer-added composite positive electrode of the present invention and its application in a solid-state battery, wherein the composite positive electrode comprises a composite positive electrode pole piece and a solid electrolyte material, and the composite positive electrode pole piece includes It is composed of positive electrode active material, additive, conductive agent and binder, and the solid electrolyte material is composed of high molecular polymer containing long chain segment, lithium salt that reacts with the high molecular polymer, and fast ion conductor. Also disclosed is a preparation method of a composite positive electrode applied to a solid-state lithium battery with polymer added, which is characterized in that it includes a preparation step of a positive electrode piece and a preparation step of a solid electrolyte membrane. The advantages of the invention are that the regularity of the molecular chain arrangement of polyethylene oxide is destroyed by the interaction between several polymer molecular chains, the glass transition temperature of the polyethylene oxide is lowered, the formation of crystals is suppressed, and the ionic conductivity is improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries and their manufacture, in particular to a composite positive electrode applied to solid-state lithium batteries with added polymers, and also to a method for preparing composite positive electrodes based on all-solid polymer electrolytes. Background technique [0002] With the rapid development of the times, from industrialization to the information Internet of Things era, traditional mineral resources cannot meet the energy needs of the new era. As an excellent energy storage device, the battery has achieved very rapid development since Sony's first commercial lithium-ion battery came out in 1992, and it is recognized as the best energy storage device in the world at this stage. At present, most of the commonly used batteries on the market are positive electrodes of transition metal oxides or phosphates, negative electrodes of graphite or silicon carbon, and a system of diaphragm plus liquid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/0565H01M10/058
CPCH01M10/0525H01M10/0565H01M10/058H01M2300/0082Y02E60/10Y02P70/50
Inventor 冯玉川李峥何泓材熊伟强张磊李艳红李洋彭祖铃杨帆南策文
Owner QINGTAO KUNSHAN ENERGY DEV CO LTD
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