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Preparation method of lithium-ion battery positive pole piece or negative pole piece

A technology for lithium-ion batteries and positive pole pieces, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of adverse effects on the electrochemical performance of pole pieces, affecting active materials, etc., and achieve the reduction of short circuit phenomenon and flexibility Enhance and reduce the effect of glitches

Active Publication Date: 2016-03-16
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most polymers are insulators, and direct coating on the pole piece will affect the active material, especially the transport of electrons between the surface materials, thus adversely affecting the electrochemical performance of the pole piece.

Method used

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  • Preparation method of lithium-ion battery positive pole piece or negative pole piece
  • Preparation method of lithium-ion battery positive pole piece or negative pole piece
  • Preparation method of lithium-ion battery positive pole piece or negative pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Positive electrode - lithium iron phosphate, negative electrode - artificial graphite, laminated polymer battery.

[0029] The preparation method of the lithium ion battery positive electrode sheet or the negative electrode sheet in the present embodiment is as follows:

[0030] In step (1), lithium iron phosphate is mixed with Super-P and PVDF in a certain proportion, and lithium iron phosphate positive electrode slurry is obtained after stirring, and artificial graphite and conductive agents Super-P and KS-6, CMC and SBR (D Styrene rubber) is mixed in a certain proportion, and artificial graphite negative electrode slurry is obtained after stirring;

[0031] In step (2), use a coating machine to uniformly coat the lithium iron phosphate positive electrode slurry and artificial graphite negative electrode slurry obtained in step (1) on the surface of aluminum foil and copper foil respectively, and dry them through the drying equipment of the coating machine After that...

Embodiment 2

[0036] Positive electrode - lithium nickel manganese cobalt ternary material, negative electrode - lithium titanate material, wound cylindrical battery.

[0037] The preparation method of the lithium ion battery positive pole piece or negative pole piece in the embodiment of the present invention is as follows:

[0038] In step (1), the lithium nickel manganese cobalt ternary material is mixed with Super-P and PVDF in a certain proportion, and the positive electrode slurry of the ternary material is obtained after stirring, and lithium titanate is mixed with Super-P, KS-6, PVDF Mix according to a certain ratio, and obtain lithium titanate negative electrode slurry after stirring;

[0039] In step (2), use a coating machine to uniformly coat the ternary material positive electrode slurry and lithium titanate negative electrode slurry obtained in step (1) on the surfaces of aluminum foil and copper foil respectively, and dry them through the drying equipment of the coating machi...

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Abstract

The invention discloses a preparation method of a lithium-ion battery positive pole piece or negative pole piece. The preparation method comprises the following steps of (1) mixing an active material of a lithium-ion battery with a conductive agent and a binder, and stirring to obtain a slurry; (2) coating the slurry obtained in the step (1) uniformly on the surface of a foil material, and drying to obtain a primary pole piece; (3) soaking the primary pole piece obtained in the step (2) in a conductive adhesive solution inside an impregnating tank for t1, wherein the preparation method of the conductive adhesive solution comprises the following steps of mixing a PTFE emulsion with water according to a certain proportion to prepare an adhesive solution intermediate, adding a certain amount of conductive carbon black into the adhesive solution intermediate, uniformly dispersing the conductive carbon black into the adhesive solution intermediate to prepare the conductive adhesive solution; and (4) drying the primary pole piece which is impregnated in the step (3) through a drying oven so as to obtain a lithium-ion pole piece. The preparation method disclosed by the invention can improve the energy density, the rate performance and the cycle life of the lithium-ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for preparing a positive pole piece or a negative pole piece of a lithium ion battery. Background technique [0002] Lithium-ion battery cells are mainly composed of positive electrodes, negative electrodes, diaphragms, and electrolytes. The positive electrode usually consists of an active material (such as lithium cobaltate, lithium manganate, lithium iron phosphate, etc.) and a conductive agent (such as acetylene black, conductive graphite, furnace black, etc.) and a binder (such as polyvinylidene fluoride, carboxymethyl fiber Sodium sodium and styrene-butadiene rubber) are mixed evenly, stirred into a paste slurry, evenly coated on both sides of the aluminum foil, dried under nitrogen flow to remove the organic dispersant, and then pressed into shape with a roller press, and then according to the design requirements Cut to the required size pole piece. Common li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M10/0525H01M10/0587
CPCH01M4/139H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 詹世英张正魏银仓
Owner YINLONG ENERGY CO LTD
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