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Flexible lithium battery piece of composite solid electrolyte and preparation method of flexible lithium battery piece

A solid-state electrolyte and lithium battery technology, applied in electrode manufacturing, secondary batteries, battery electrodes, etc., can solve problems such as polluting the environment, complicated processes, and use

Inactive Publication Date: 2021-07-06
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the existing coating molding process of lithium battery polymer solid electrolyte membrane, there are processing defects such as complex process, using more solvents, polluting the environment, etc., the present invention proposes a flexible lithium battery sheet with composite solid electrolyte, which uses The characteristics of thermoplastic processing, designed to extrude the polymer electrolyte thermoplastically into a sheet; assist a small amount of polymer to process the positive electrode active material into a sheet, thereby forming a laminated composite sheet; further laminating aluminum foil on the positive electrode, The electrolyte layer is laminated with a lithium sheet as the negative electrode to obtain a lithium battery sheet, which greatly simplifies the current complex process of preparing the positive and negative electrode sheets by coating the lithium battery electrode sheets separately; in particular, the invention discloses a specific preparation method

Method used

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  • Flexible lithium battery piece of composite solid electrolyte and preparation method of flexible lithium battery piece
  • Flexible lithium battery piece of composite solid electrolyte and preparation method of flexible lithium battery piece
  • Flexible lithium battery piece of composite solid electrolyte and preparation method of flexible lithium battery piece

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Experimental program
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Effect test

Embodiment 1

[0044] (1) In parts by weight, add 76 parts by weight of 622-type nickel-cobalt lithium manganate ternary active material, 13 parts by weight of polyvinylidene fluoride, 2.6 parts by weight of acetylene black and 2.2 parts by weight of dimethyl sulfoxide into a high-speed mixer , dispersed evenly to obtain material A;

[0045] (2) In parts by weight, 100 parts by weight of polyethylene carbonate, 17 parts by weight of polyethylene oxide, and 70 parts by weight of lithium bistrifluoromethanesulfonimide were added to the high mixer, and dispersed evenly to obtain material B;

[0046] (3) In parts by weight, mix 5 parts by weight of polyethylene glycol-polyglyceryl methacrylate block copolymer gel and 1.6 parts by weight of lithium bistrifluoromethanesulfonimide, and disperse evenly to obtain C material;

[0047] (4) Add material A obtained in step (1) and material B obtained in step (2) respectively into the material A extruder and material B extruder of the double-layer co-ext...

Embodiment 2

[0049] (1) In parts by weight, add 78 parts by weight of 622-type nickel-cobalt lithium manganate ternary active material, 15 parts by weight of polyvinylidene fluoride, 2.5 parts by weight of acetylene black, and 2.2 parts by weight of dimethyl sulfoxide into the high-speed mixer In the middle, the dispersion is uniform, and the material A is obtained;

[0050] (2) In parts by weight, add 100 parts by weight of polypropylene carbonate, 15 parts by weight of polyethylene oxide, and 60 parts by weight of lithium bistrifluoromethanesulfonimide into a high-mixer, disperse evenly, and obtain material B;

[0051] (3) In parts by weight, mix 3 parts by weight of polyethylene glycol-polyglyceryl methacrylate block copolymer gel and 1.0 parts by weight of lithium bistrifluoromethanesulfonimide, and disperse evenly to obtain C material;

[0052] (4) Add material A obtained in step (1) and material B obtained in step (2) respectively into the material A extruder and material B extruder...

Embodiment 3

[0054] (1) In parts by weight, add 80 parts by weight of 622-type nickel-cobalt lithium manganate ternary active material, 15 parts by weight of polyvinylidene fluoride, 3.0 parts by weight of acetylene black, and 2.0 parts by weight of dimethyl sulfoxide into the high-speed mixer In the middle, the dispersion is uniform, and the material A is obtained;

[0055] (2) In parts by weight, 100 parts by weight of polyvinyl carbonate, 15 parts by weight of polyethylene oxide, and 60 parts by weight of lithium bistrifluoromethanesulfonimide were added to the high mixer, and dispersed evenly to obtain material B;

[0056] (3) In parts by weight, mix 5 parts by weight of polyethylene glycol-polyglyceryl methacrylate block copolymer gel and 2.0 parts by weight of lithium bistrifluoromethanesulfonimide, and disperse evenly to obtain C material;

[0057] (4) Add material A obtained in step (1) and material B obtained in step (2) respectively into the material A extruder and material B ex...

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Abstract

The invention relates to the field of solid electrolyte of a lithium battery, and discloses a flexible lithium battery piece of a composite solid electrolyte and a preparation method of the flexible lithium battery piece. The method comprises the following steps: (1) preparing a high-nickel ternary active material, polyvinylidene fluoride, a conductive agent and a plasticizer into a material A; (2) preparing a material B from polycarbonate electrolyte, polyoxyethylene and lithium salt; (3) preparing a material C from the polyethylene glycol-polyglycerol methacrylate segmented copolymer gel and a lithium salt; and (4) melting, extruding and compounding the material A and the material B into an AB sheet by using a double-layer co-extrusion extruder, thermally laminating the layer A with an aluminum foil roll surface, coating the material C on the material B layer, laminating a lithium sheet, rolling, continuously drawing, cooling and cutting to obtain the flexible lithium battery sheet of the composite solid electrolyte. The method provided by the invention is clean in environment, simple in process and easy for large-scale production, improves good interface compatibility of the electrode material and the solid electrolyte, effectively reduces solid / solid contact impedance, and has an excellent application prospect.

Description

technical field [0001] The invention relates to the field of lithium battery solid electrolytes, and discloses a flexible lithium battery sheet of a composite solid electrolyte and a preparation method thereof. Background technique [0002] In recent years, the rapid development of the field of new energy power generation has put forward new requirements for the matching energy storage system. In the replacement of energy storage batteries, lithium-ion batteries have become a key research field due to their various advantages, and have been practically applied in a large number of energy storage projects and achieved certain results. With the development of high technology, lithium-ion batteries have been widely used in electric vehicles, smart phones, energy storage and many other fields due to their advantages such as high working voltage, high energy density, no memory effect, long cycle life and no pollution. [0003] A lithium battery is mainly composed of a positive e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0585H01M4/1391H01M4/04H01M4/131H01M10/0525H01M10/0565
CPCH01M4/0411H01M4/131H01M4/1391H01M10/0525H01M10/0565H01M10/0585H01M2004/028Y02E60/10Y02P70/50
Inventor 曾军堂陈庆司文彬李钧
Owner CHENDU NEW KELI CHEM SCI CO LTD
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