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Preparation method of polymer-added composite cathode and application of composite cathode in solid-state battery

A composite cathode, solid-state battery technology, used in secondary batteries, solid electrolytes, non-aqueous electrolyte batteries, etc., can solve problems such as battery safety hazards, achieve inhibition of crystal formation, wide liquid range, and large polarity controllability Effect

Active Publication Date: 2018-06-29
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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  • Preparation method of polymer-added composite cathode and application of composite cathode in solid-state battery
  • Preparation method of polymer-added composite cathode and application of composite cathode in solid-state battery
  • Preparation method of polymer-added composite cathode and application of composite cathode in solid-state battery

Examples

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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 cathode and application of the composite cathode in a solid-state battery. The composite cathode is characterized by comprising a composite cathode pole piece and a solid-state electrolyte material, wherein the composite cathode pole piece is prepared from a cathode active material, an additive, a conductive agent and a binder; the solid-state electrolyte material is prepared from a high-molecular polymer with a long chain segment, lithium salt conducting a coordination reaction with the high-molecular polymer, and a fast ion conductor. The invention also discloses a preparation method of the polymer-added composite cathode applied to a solid-state lithium battery. The preparation method is characterized by comprising the following steps: preparing a cathode pole piece, preparing a solid-state electrolyte membrane. The preparation method disclosed by the invention has the following advantages: the arrangement regularity of polyoxyethylene molecular chains is damaged by the effect among the molecular chains of several polymers, the glass-transition temperature is lowered, the crystal formation is inhibited, and the ionic conductance is enhanced.

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 Applications(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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