Water-based conducting sizing agent for coating on surface of current collector of high-safety lithium battery and preparation method application thereof

A conductive paste, surface coating technology, applied in battery electrodes, electrode carriers/current collectors, conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problem of poor adhesion between electrode material and current collector, thermal runaway There are no problems such as prevention and limited contact area, which can increase the cruising range, improve the consistency of dynamic internal resistance, and reduce the internal resistance of the battery.

Active Publication Date: 2017-10-13
佛山市大为科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 particles, large interface resistance, poor adhesion between the pole piece material and the current collector, etc., Provide a high-safety lithium battery current collector surface coating water-based conductive paste and its preparation method and application

Method used

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  • Water-based conducting sizing agent for coating on surface of current collector of high-safety lithium battery and preparation method application thereof
  • Water-based conducting sizing agent for coating on surface of current collector of high-safety lithium battery and preparation method application thereof
  • Water-based conducting sizing agent for coating on surface of current collector of high-safety lithium battery and preparation method application thereof

Examples

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Embodiment 1

[0032] A high-safety lithium battery current collector surface coating water-based conductive paste, including the following components by weight percentage: graphene: conductive carbon black: 10%, dispersant: 2%, cellulose CMC: 2%, moistening Wet agent: 0.5%, thermoplastic acrylic resin: 20%, polyolefin microsphere emulsion: 10%, deionized water: the balance.

[0033] The preparation process of polyolefin microsphere emulsion is: using supercritical ethane / carbon dioxide pulverization process, dissolving ethylene-propylene block copolymer and ethylene-methacrylic acid copolymer in ethane / carbon dioxide mixed critical In the liquid, the mass ratio of ethane to carbon dioxide is 1:1.5, the spray velocity of the control solution is 380m / s, and the expansion time is 10 -8 s, to obtain polyolefin microsphere aggregates with a particle size of 3 μm; mix the above polyolefin microsphere aggregates with high molecular weight acrylic acid additives, and perform surface modification in...

Embodiment 2

[0043] A high-safety lithium battery current collector surface coating water-based conductive paste, including the following components in weight percentage: SP-Li: 5%, dispersant: 4%, cellulose HEC: 1%, wetting agent: 1%, styrene-acrylic emulsion: 15%, polyolefin microsphere emulsion: 5%, deionized water: the balance.

[0044] Preparation process of polyolefin microsphere emulsion:

[0045] Using supercritical ethane / carbon dioxide crushing process, the ethylene-propylene block copolymer and ethylene-methacrylic acid copolymer are dissolved in the ethane / carbon dioxide mixed critical liquid according to the mass ratio of 2:1, the mass ratio of ethane to carbon dioxide The ratio is 1:1.5, the spray velocity of the control solution is 420m / s, and the expansion time is 10 -8 s, to obtain polyolefin microsphere aggregates with a particle size of 2 μm; mix the above polyolefin microsphere aggregates with high molecular weight acrylic acid additives, and perform surface modificati...

Embodiment 3

[0055] A high-safety lithium battery current collector surface coating water-based conductive paste, including the following components in weight percentage: graphene: 0.5%, dispersant: 10%, cellulose HPMC: 0.2%, wetting agent: 0.1 %, binder epoxy resin: 2%, polyolefin microsphere emulsion: 0.5%, deionized water: the balance.

[0056] Preparation process of polyolefin microsphere emulsion: using supercritical ethane / carbon dioxide pulverization process, dissolving ethylene-propylene block copolymer and ethylene-methacrylic acid copolymer in ethane / carbon dioxide mixed critical liquid according to the mass ratio of 2:1 , the mass ratio of ethane to carbon dioxide is 1:1.5, the spray velocity of the control solution is 480m / s, and the expansion time is 10 -9 s, Polyolefin microsphere aggregates with a particle size of 1 μm were prepared. Mix the above-mentioned polyolefin microsphere aggregates with high-molecular-weight acrylic acid additives evenly, and perform surface modifi...

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Abstract

The invention discloses a water-based conducting sizing agent for coating on the surface of the current collector of a high-safety lithium battery. The water-based conducing sizing agent is prepared from the following components in percentages by weight: 0.5% to 15% of a conducting material, 0.5% to 10% of a dispersing agent, 0.2% to 2% of cellulose, 0.1% to 1% of a wetting agent, 2% to 20% of an adhesive, 0.5% to 10% of a polyolefin microballoon emulsion and the balance of deionized water. The invention also discloses a preparation method of the water-based conducting sizing agent and a method for using the water-based conducting sizing agent on the current collector of the high-safety lithium battery. According to the water-based conducting sizing agent disclosed by the invention, thermal runaway can be effectively prevented, so that the safety of the battery is improved; the adhesive force between a positive material and an aluminum foil and the adhesive force between a negative material and a copper foil are improved, and the proportion of the positive adhesive or the negative adhesive is reduced, so that the energy density of the battery is improved, and the endurance mileage is increased; simultaneously, the internal resistance of the battery is greatly reduced, dynamic internal resistance consistency of the battery is improved, and the service life of the battery pack is prolonged; the electrical conductivity of the positive material and the aluminum foil and the electrical conductivity of the negative material and the copper foil are strengthened, and the charging capacity and discharging capacity are quickly improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-safety lithium battery current collector surface coating water-based conductive paste and its preparation method and application. 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 pole pieces determines more than 80% of the performance of the battery. [0003] In the conventional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/62H01B1/24H01M10/42
CPCH01B1/24H01M4/625H01M4/667H01M4/668H01M10/4235Y02E60/10
Inventor 周侨发
Owner 佛山市大为科技有限公司
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