Water-based conductive paste for coating surface of modified lithium battery current collector and preparation method and application of water-based conductive paste

A technology of conductive paste and surface coating, applied to battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve the problem of poor adhesion between electrode material and current collector, no prevention of thermal runaway, limited contact area, etc. problem, achieve the effect of reducing the proportion of binder, improving the consistency of dynamic internal resistance, and increasing the cruising range

Active Publication Date: 2017-11-17
佛山市大为科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the defects that the current lithium battery has no preventive effect on thermal runaway, poor safety, limited contact area between the rigid metal current collector and the active material particle

Method used

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  • Water-based conductive paste for coating surface of modified lithium battery current collector and preparation method and application of water-based conductive paste
  • Water-based conductive paste for coating surface of modified lithium battery current collector and preparation method and application of water-based conductive paste
  • Water-based conductive paste for coating surface of modified lithium battery current collector and preparation method and application of water-based conductive paste

Examples

Experimental program
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Embodiment 1

[0032] A water-based conductive paste for coating the surface of a modified lithium battery current collector, comprising the following components in weight percent: graphene: 0.1%, dispersant: 0.5%, cellulose CMC: 4%, wetting agent: 1 %, thermoplastic acrylic resin: 2%, physical microsphere foaming agent with a particle size of 0.1 μm: 10%, deionized water: the balance.

[0033] Blending process:

[0034] 1) Disperse the cellulose CMC in deionized water under stirring, and disperse at high speed for 60 minutes. After the cellulose is completely dissolved, add the dispersant and stir evenly;

[0035] 2) Add graphene and disperse at high speed for 0.5h until the surface of the conductive material is completely wetted;

[0036] 3) Under the condition that the cooling temperature is 12°C, wet nano-grinding is carried out, the grinding speed is 2600rpm / min, and the grinding time is 0.5h;

[0037] 4) Wetting agent, binder and physical microsphere foaming agent are added in sequen...

Embodiment 2

[0042] A water-based conductive paste for coating the surface of a modified lithium battery current collector, including the following components in weight percentage: SP-Li: 7.5%, dispersant: 1.5%, cellulose HEC: 0.5%, wetting agent: 0.3%, polyurethane: 9%, physical microsphere foaming agent with a particle size of 1.0 μm: 5%, deionized water: the balance.

[0043] Blending process:

[0044] 1) Disperse cellulose HEC in deionized water under stirring, disperse at high speed for 25 minutes, add dispersant and stir evenly after the cellulose is completely dissolved;

[0045] 2) Add SP-Li and disperse at high speed for 1 hour until the surface of the conductive material is completely wetted;

[0046] 3) Under the condition that the cooling temperature is 8°C, carry out wet nano-grinding, the grinding speed is 2000rpm / min, and the grinding time is 1h;

[0047] 4) Wetting agent, binder and physical microsphere foaming agent were added in sequence, and the homogenization treatmen...

Embodiment 3

[0052] A modified lithium battery current collector surface coating water-based conductive paste, including the following components by weight percentage:

[0053] Conductive carbon black: 15%, dispersant: 10%, cellulose HPMC: 1.5%, wetting agent: 0.6%, epoxy resin: 12%, particle size is 3.0μm physical microsphere foaming agent: 2%, go Ionized water: balance.

[0054] Blending process:

[0055] 1) Disperse cellulose HPMC into deionized water under stirring, disperse at high speed for 40 minutes, add dispersant and stir evenly after the cellulose is completely dissolved;

[0056] 2) Add conductive carbon black and disperse at high speed for 2 hours until the surface of the conductive material is completely wetted;

[0057] 3) Under the condition that the cooling temperature is 5°C, wet nano-grinding is carried out, the grinding speed is 1200rpm / min, and the grinding time is 3h;

[0058] 4) Wetting agent, binder and physical microsphere foaming agent were added in sequence, and...

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Abstract

The invention discloses water-based conductive paste for coating a surface of a modified lithium battery current collector. The water-based conductive paste comprises the following constituents based on percent by weight: 0.1-20% of conductive material, 0.5-15% of dispersing agent, 0.2-4% of cellulose, 0.1-1% of wetting agent, 2-20% of binding agent and 0.5-10% of physical microsphere foaming agent with the balance being deionized water. The invention also discloses a preparation method and application method of the water-based conductive paste. By the water-based conductive paste, thermal runaway can be effectively prevented, the battery safety is improved, the adhesion between a positive electrode material and an aluminum foil and the adhesive between a negative electrode material and a copper foil are improved, the duty ratio of the binding agent of a positive electrode or a negative electrode is reduced, so that the energy density of a battery is improved, the duration is improved, meanwhile, the internal resistance of the battery is substantially reduced, the dynamic internal resistance consistency of the battery is improved, the lifetime of a battery pack is prolonged, the conductivity between the positive electrode material and the aluminum foil and the conductivity between the negative electrode material and the copper foil are improved, and the rapid charge-discharge capability is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a modified lithium battery current collector surface coating water-based conductive paste and a preparation method thereof, and a method for preparing a modified lithium battery current collector using the water-based conductive paste. Background technique [0002] Due to the advantages of large capacity, long life, no environmental pollution, and safe use, lithium secondary batteries have been widely used in portable electrical appliances such as mobile phones and notebook computers. With the development of technology, lithium-ion batteries also have very good application prospects in the fields of electric vehicles and energy storage in the future. At the same time, people have put forward higher requirements for the cruising range, charge and discharge speed, cycle life, and safety performance of lithium batteries. Among them, the state of the lithium battery po...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/62H01M10/0525H01M10/42
CPCH01M4/62H01M4/624H01M4/667H01M10/0525H01M10/4235Y02E60/10
Inventor 周侨发
Owner 佛山市大为科技有限公司
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