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Composite binder for lithium ion battery, positive electrode slurry for lithium ion battery, and lithium ion battery

A lithium-ion battery and positive electrode slurry technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of general compatibility between the electrode sheet and the electrolyte, affecting the cycle performance of lithium-ion batteries, etc., and improve the cycle rate Good performance, good consistency, and the effect of improving compatibility

Active Publication Date: 2018-12-18
LUOYANG LIRONG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The slurry prepared by this method is applied to the lithium-ion battery, and the compatibility between the pole piece and the electrolyte is general, which affects the cycle performance of the lithium-ion battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The composite binder for lithium ion batteries of the present embodiment is made up of the following components in parts by weight: 96 parts of binder polyvinylidene fluoride (PVDF), 2 parts of ethylene carbonate (EC), carboxymethyl cellulose Sodium (CMC) 2 parts.

[0035] The lithium ion battery positive electrode slurry of the present embodiment is composed of the following components in parts by weight: 920 parts of positive electrode active material lithium iron phosphate, 15 parts of conductive agent graphene, 15 parts of mesoporous carbon, and composite bonding agent for lithium ion battery 100 parts of solvent, 1202 parts of solvent N-methylpyrrolidone; the composite binder for lithium ion battery is made up of the following components in parts by weight: 96 parts of binder polyvinylidene fluoride (PVDF), ethylene carbonate (EC) 2 parts, 2 parts of sodium carboxymethylcellulose (CMC).

[0036] The preparation method of the lithium ion battery positive electrode ...

Embodiment 2

[0043] The composite binder for lithium ion batteries of the present embodiment is made up of the following components in parts by weight: 94 parts of binder polyvinylidene fluoride (PVDF), 1 part of ethylene carbonate (EC), carboxymethyl cellulose Sodium (CMC) 1 part.

[0044] The lithium ion battery positive electrode slurry of the present embodiment is composed of the following components in parts by weight: 900 parts of positive electrode active material lithium iron phosphate, 10 parts of conductive agent graphene, 10 parts of mesoporous carbon, and composite bonding agent for lithium ion battery 96 parts of solvent, 1501 parts of solvent N-methylpyrrolidone; the composite binder for lithium ion battery is made up of the following components in parts by weight: 94 parts of binder polyvinylidene fluoride (PVDF), ethylene carbonate (EC) 1 part, 1 part of sodium carboxymethylcellulose (CMC).

[0045] The preparation method of the lithium ion battery positive electrode slurr...

Embodiment 3

[0052] The composite binder for lithium ion batteries of the present embodiment is made up of the following components in parts by weight: 98 parts of binder polyvinylidene fluoride (PVDF), 3 parts of ethylene carbonate (EC), carboxymethyl cellulose Sodium (CMC) 3 parts.

[0053] The lithium ion battery positive electrode slurry of the present embodiment is composed of the following components in parts by weight: 940 parts of positive electrode active material lithium iron phosphate, 20 parts of conductive agent graphene, 20 parts of mesoporous carbon, and composite bonding agent for lithium ion battery 104 parts of solvent, 1003 parts of solvent N-methylpyrrolidone; the composite binder for lithium ion battery is made up of the following components in parts by weight: 98 parts of binder polyvinylidene fluoride (PVDF), ethylene carbonate (EC) 3 parts, 3 parts of sodium carboxymethylcellulose (CMC).

[0054] The preparation method of the lithium ion battery positive electrode ...

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PUM

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Abstract

The invention relates to a composite binder for a lithium ion battery, a positive pole slurry of the lithium ion battery and the lithium ion battery and belongs to the technical field of lithium ion batteries. The composite binder for the lithium ion battery is prepared from, by weight, 94-98 parts of adhesive and 1-3 parts of ethylene carbonate. The composite binder for the lithium ion battery contains the adhesive, is also added with the ethylene carbonate and is adopted to prepare a pole piece, the compatibility of the binder and electrolyte in the pole piece can be improved, change of an electrode material layer on the pole piece can be avoided in the charge and discharge process of the lithium ion battery, the stability of the electrode material layer is improved, and further the cycle performance of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to a composite binder for a lithium ion battery, a positive electrode slurry of the lithium ion battery and a lithium ion battery, and belongs to the technical field of lithium ion batteries. Background technique [0002] The electrochemical performance of lithium-ion batteries is greatly affected by the preparation process of the battery. The production process of lithium-ion batteries includes multiple steps such as slurry mixing, coating, rolling, slicing, lamination, and liquid injection. The slurry mixing process is the preparation process. In the first step of the lithium-ion battery, the quality of the slurry has a decisive effect on the subsequent coating process and the pass rate of the product. Slurry mixing refers to the process of dispersing electrode materials into a solvent to obtain a uniform and stable slurry. The feeding sequence and stirring parameters during slurry mixing have an important impact on the performa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/139H01M10/0525
CPCH01M4/139H01M4/62H01M4/621H01M4/625H01M10/0525Y02E60/10
Inventor 李志王燕
Owner LUOYANG LIRONG NEW ENERGY TECH
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