Cylindrical lithium slurry battery and preparation method thereof

A slurry battery and cylindrical technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery pack components, etc., can solve the problems of low production efficiency, tension curvature change, dislocation deformation, complex process, etc., and achieve long-life applications , the effect of preventing uneven thickness distribution

Active Publication Date: 2020-06-09
南京竞予能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current lithium slurry battery is mainly a laminated structure, which has the problems of complex process and low production efficiency. However, the cylindrical lithium slurry battery using the winding method can greatly simplify the processing technology of the electrode sheet, and has obvious manufacturing costs. However, due to the thick electrode sheets of lithium slurry batteries, it is necessary to solve the problems of dislocation and deformation caused by tension and curvature changes during the winding process. In addition, how to realize online rehydration and liquid replacement of cylindrical lithium slurry batteries also requires maintenance. Special structural design in the battery

Method used

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  • Cylindrical lithium slurry battery and preparation method thereof
  • Cylindrical lithium slurry battery and preparation method thereof
  • Cylindrical lithium slurry battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] Step (a): Preparation of Electrode Slurry

[0106]Lithium cobaltate, carbon black and polyvinylidene fluoride (PVDF) were added to N-methyl-2-pyrrolidone (NMP) at a mass ratio of 85:13:2 and stirred evenly to obtain a positive electrode with a solid content of 50%. slurry;

[0107] Add lithium titanate, carbon black and polyvinylidene fluoride (PVDF) into N-methyl-2-pyrrolidone (NMP) at a mass ratio of 87:10:3 and stir well to obtain a negative electrode slurry with a solid content of 55%. material.

[0108] Step (b): Preparation of Porous Electrode Sheet

[0109] Coating the positive electrode slurry prepared in step (a) on one side of the first aluminum mesh to form the first positive electrode slurry layer, coating the positive electrode slurry obtained in step (a) on one side of the second aluminum mesh side to form the second positive electrode slurry layer, and a layer of PET non-woven fabric is attached to the side of the first aluminum mesh and the second alu...

Embodiment 2

[0117] Step (a): Preparation of Electrode Slurry

[0118] Add lithium iron phosphate, Ketjen black and styrene-butadiene latex into deionized water according to the mass ratio of 86:10:4 and stir well to obtain a positive electrode slurry with a solid content of 60%;

[0119] Graphite, carbon nanotubes, sodium carboxymethyl cellulose and styrene-butadiene latex are added into deionized water according to the mass ratio of 82:16:1.5:0.5 and fully stirred evenly to obtain a negative electrode slurry with a solid content of 65%.

[0120] Step (b): Preparation of Porous Electrode Sheet

[0121] On both sides of the first stainless steel net whose surface is cleaned by concentrated sulfuric acid and hydrogen peroxide, apply the positive electrode slurry prepared in step (a) respectively to form the first positive electrode slurry layer and the second positive electrode slurry layer, and then heat Dry for 10 minutes to obtain a porous positive electrode sheet. Wherein the thicknes...

Embodiment 3

[0129] Step (a): Preparation of Electrode Slurry

[0130] The aqueous binder (LA132) of lithium iron manganate, carbon fiber and acrylonitrile multi-polymer copolymer was added into deionized water at a mass ratio of 80:15:5 and stirred evenly to obtain a positive electrode slurry with a solid content of 40%.

[0131] The water-based binder (LA132) of soft carbon, carbon fiber and acrylonitrile multi-polymer copolymer was added into the deionized water according to the mass ratio of 82:17:1 and fully stirred evenly to obtain a negative electrode slurry with a solid content of 70%.

[0132] The water-based binder (LA132) of carbon black, carbon fiber and acrylonitrile multi-polymer copolymer is added into deionized water according to the mass ratio of 55:15:30 and fully stirred evenly to obtain a positive electrode conductive paste with a solid content of 10%;

[0133] Step (b): Preparation of Porous Electrode Sheet

[0134] Apply the positive electrode conductive paste prepar...

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Abstract

The invention provides a cylindrical lithium slurry battery. The battery comprises a shell and a battery cell accommodated in the shell, wherein the battery cell comprises a roll core and a porous winding part wound on the roll core; the roll core is arranged at the axis of the battery cell, and the thickness compensation part is arranged on the roll core, so that the winding part can be tightly wound around the roll core without loosening, the structural stability of the battery is improved, the cycle life of the battery is prolonged, and the problems of dislocation deformation, uneven thickness distribution of an electrode plate and the like in the winding process of the battery cell are solved; besides, a liquid changing part and a cavity for accommodating the electrolyte are arranged in the battery, so that online maintenance operations such as liquid injection, liquid supplementation or liquid changing can be quickly carried out on the battery, the service performance of the battery is improved, and the service life of the battery is prolonged. The invention further provides a preparation method of the cylindrical lithium slurry battery. The method is simple and efficient to operate, low in processing and manufacturing cost and high in process reliability.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a cylindrical lithium slurry battery and a preparation method thereof. Background technique [0002] Lithium slurry battery is a new type of lithium-ion battery with low cost, long life, high safety and easy recycling. Since lithium slurry itself has a dynamic contact conductive network, the electrode thickness can reach 10-50 times that of traditional lithium-ion batteries. Therefore, problems such as battery capacity drop and cycle life attenuation caused by shedding or loosening of traditional lithium-ion battery electrode materials can be avoided. The current lithium slurry battery is mainly a laminated structure, which has the problems of complex process and low production efficiency. However, the cylindrical lithium slurry battery using the winding method can greatly simplify the processing technology of the electrode sheet, and has obvious manufacturing costs. However, due to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0587H01M2/36H01M4/64
CPCH01M4/64H01M10/058H01M10/0587H01M50/60Y02E60/10Y02P70/50
Inventor 孙晨宇陈永翀王玉伟何颖源刘梦王馨张彬
Owner 南京竞予能源有限公司
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