High-security lithium ion batteries and preparation method thereof

A lithium-ion battery and negative electrode technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, secondary battery components, etc., can solve the problems that the safety performance of batteries cannot meet the needs, etc.

Inactive Publication Date: 2017-06-13
SPRINGPOWER TECHNOLOGY (SHENZHEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the safety performance of the battery still cannot meet the demand, so there is an urgent need for a lithium-ion battery with high safety performance

Method used

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  • High-security lithium ion batteries and preparation method thereof
  • High-security lithium ion batteries and preparation method thereof
  • High-security lithium ion batteries and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First, the negative electrode sheet is prepared according to the conventional lithium-ion battery negative electrode sheet preparation process. The negative electrode sheet includes a current collector and a carbon layer coated on the current collector. The carbon layer is graphite layer, hard carbon material layer or soft carbon material layer. Any one, including taking nanoparticles and dispersing them in the binder solution to configure a latex solution, the melting point of the nanoparticles is 90-110°C, the nanoparticles can be hyperbranched polymers or dendritic polymers, Preferably, the nanoparticles are polyethylene, polypropylene, low-density polyethylene, ethylene-octene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, chlorinated polyethylene, polyvinyl chloride, thermoplastic polyurethane Any one of elastomers, in this embodiment, the nanoparticles are polyethylene nanoparticles, and the binder is any one of styrene-butadiene rubb...

Embodiment 2

[0036] First, the negative electrode sheet is prepared according to the conventional lithium-ion battery negative electrode sheet preparation process. The negative electrode sheet includes a current collector and a carbon layer coated on the current collector. The carbon layer is graphite layer, hard carbon material layer or soft carbon material layer. Either, comprising then getting the nanoparticles of ethylene-vinyl acetate copolymer dispersed in the binder solution, configured into a latex solution, the binder described in this embodiment is sodium carboxymethyl cellulose, and then using Any coating process such as extrusion coating, transfer coating, spray coating, etc. coats the latex solution on the surface of the carbon layer of the negative electrode sheet, and dries to obtain an ethylene-vinyl acetate copolymer coating. The ethylene-vinyl acetate The thickness of the ester copolymer coating is 5-10 μm. The lithium-ion battery cells prepared in Example 2 and Comparati...

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Abstract

The invention discloses high-security lithium ion batteries and a preparation method thereof. A prepared negative pole piece is coated with a chemically inert organic polymer coating, the organic polymer coating is insoluble in water, and the melting point of the organic polymer coating is 90-110 DEG C. when the lithium ion batteries have thermal runaway of battery internal short circuit caused by destructive crash such as overcharge, heavy stuff impact, thermal shock, short circuit, needling, and extrusion, a polyethylene nanoparticle coating is melted and forms a coating of the surface of the negative pole piece, a protective film is formed in the surface of the negative pore piece, the contact short circuit of a positive pore piece and the negative pore piece can be effectively isolated, the inlay and precipitation of lithium metal ions can be effectively prevented, and therefore the further rise of the temperature due to active substance dissolution and the thermal runaway is restrained, and the overall security property of a cell can be improved obviously.

Description

technical field [0001] The technical field of the lithium ion battery of the present invention particularly relates to a high safety lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in all walks of life. With the promotion of application fields and higher requirements for user experience, end customers have higher and higher requirements for the safety performance of lithium batteries. At present, the industry is not mature enough to completely improve Lithium-ion battery safety performance and other products. Although the specific cause of the mobile phone explosion has not been investigated clearly, industry analysis is likely to be due to the safety factor of the high-energy-density lithium battery used in it not meeting the requirements of relevant international certification. [0003] As the energy density of lithium battery products is getting higher and higher, the materials used are getti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058H01M10/02
CPCH01M10/02H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 卢国杰黄波易欣
Owner SPRINGPOWER TECHNOLOGY (SHENZHEN) CO LTD
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