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Novel composite positive electrode, preparation method and use thereof and solid lithium battery

A composite cathode and solid electrolyte technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems that restrict the large-scale application of polymer electrolytes, low room temperature ionic conductivity, etc., and achieve great practical significance in production and wide production. Application, effect of reducing impedance

Inactive Publication Date: 2018-12-07
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, polymer electrolytes have good elasticity, easy film formation, good mechanical processing performance, and are easy to be industrialized. However, their low room temperature ionic conductivity has always restricted the large-scale application of polymer electrolytes.

Method used

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  • Novel composite positive electrode, preparation method and use thereof and solid lithium battery
  • Novel composite positive electrode, preparation method and use thereof and solid lithium battery

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preparation example Construction

[0072] Also, see figure 1 As shown, the present invention also provides a method for preparing a novel composite positive electrode, which is used to prepare the above-mentioned novel composite positive electrode provided by the present invention, and can be used to specifically prepare a solid-state lithium battery. The method specifically includes the following steps:

[0073] The first step: preparing a composite solid electrolyte solution;

[0074] The second step: compound and mix the composite solid electrolyte solution, positive electrode active material, conductive agent and dispersant according to the preset ratio, and stir evenly, and apply it on the positive electrode current collector, and then dry it to prepare a composite positive electrode;

[0075] In the second step, the positive electrode current collector may be aluminum foil.

[0076] In the present invention, in the second step, the conductive agent comprises at least one of carbon black, krypton cyanoge...

specific Embodiment 1

[0098] In specific example 1, the present invention prepares the composite positive electrode based on novel composite solid state electrolyte, comprises the following steps:

[0099] The first step: first, get 5g of polymer PEO (400,000 molecular weight), and dissolve 5g of lithium salt LiTFSI in 90g of solvent tetrahydrofuran to prepare a polymer solid electrolyte solution. The weight percentage: polymer PEO is 5% , lithium salt LiTFSI is 5%; then, take 10g of tetraethyl orthosilicate and dissolve in 80g of formic acid, and mix 10g of ionic liquid, the ionic solution is specifically: 1-methyl-1-propylpyrrolidine bis (Trifluoromethanesulfonyl) imide salt is formulated into the first mixed solution consisting of ionic liquid, tetraethyl orthosilicate and formic acid, wherein the weight percentage is: tetraethyl orthosilicate is 10%, 1 -Methyl-1-propylpyrrolidine bis(trifluoromethanesulfonyl)imide salt is 10%, formic acid is 80%; then, the polymer solid electrolyte solution and...

specific Embodiment 2

[0106] In specific embodiment 2, the present invention prepares the composite positive electrode based on novel composite solid state electrolyte, comprises the following steps:

[0107] The first step, at first, get the polymer PEO (400,000 molecular weight) of 5g, the lithium salt LiTFSI of 5g are dissolved in the solvent tetrahydrofuran of 90g, be mixed with the polymer solid electrolyte solution, wherein weight percentage is: Polymer PEO is 5%, lithium salt LiTFSI is 5%; then, take 10g tetraethyl orthosilicate and dissolve in 80g formic acid, and mix 10g ionic liquid 1-methyl-1-propylpyrrolidine bis(trifluoromethanesulfonyl) Imine salt, formulated as a mixed solution consisting of ionic liquid, tetraethyl orthosilicate and formic acid, wherein the percentage by weight is: tetraethyl orthosilicate is 10%, ionic liquid 1-methyl-1-propane Pyrrolidine bis(trifluoromethanesulfonyl)imide salt is 10%; Finally, according to the required composite solid electrolyte formula, the pol...

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Abstract

The invention discloses a preparation method of a novel composite positive electrode. The preparation method comprises: 1, preparing a composite solid electrolyte solution, 2, mixing the composite solid electrolyte solution, a positive electrode active material, a conductive agent and a dispersing agent according to a preset ratio, carrying out uniform stirring, coating a positive electrode current collector with the mixture and carrying out drying to obtain a composite positive electrode, and 3, coating the composite positive electrode with the composite solid electrolyte solution obtained bythe step 1 and carrying out drying to obtain a composite positive electrode with the solid electrolyte. The invention also discloses the novel composite positive electrode and a solid lithium batteryusing the same. The preparation method keeps the soft contact between the solid electrolyte and the electrode active material and soft contact between the solid electrolyte and the battery electrodeand reduces the interface impedance between the solid electrolyte and the electrode active material and between the solid electrolyte and the battery electrode.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a solid-state lithium battery of a novel composite positive electrode, a preparation method and application thereof. Background technique [0002] At present, lithium-ion batteries have the advantages of high specific energy, many cycle times, and long storage time. They are not only widely used in portable electronic devices such as mobile phones, digital cameras, and laptop computers, but also widely used in electric vehicles and electric bicycles. And large and medium-sized electric equipment such as electric tools, therefore, in view of the continuous expansion of the application of lithium-ion batteries, the market demand for the energy density of lithium-ion batteries is constantly increasing, and at the same time, the safety performance requirements for lithium-ion batteries are getting higher and higher . [0003] At present, the inherent intrinsic safety properties of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/04H01M10/0565H01M10/0525
CPCH01M4/0404H01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/362H01M4/505H01M4/525H01M4/5825H01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 孟繁慧郑涛马洪运王欣全周江伍绍中
Owner TIANJIN LISHEN BATTERY
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