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Composite isolating membrane of lithium ion battery and preparation method and application of composite isolating membrane

A technology for lithium-ion batteries and separators, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as inability to ensure the tight fit of composite separator layers, loss of battery capacity, and poor stability of the separator, and achieve Sufficient storage and infiltration, improved cycle life, and low cost

Active Publication Date: 2019-11-05
湖北锂诺新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium dendrites cause loss of battery capacity even if they don't cause safety concerns
There have been reports in the literature on a composite separator with a sandwich structure. The intermediate layer is coated with silicon dioxide and polyvinylidene fluoride, which can react with the generated lithium dendrites and improve battery safety. However, the problem with this method is that it cannot guarantee The tight fit between the composite diaphragm layers, the stability of the diaphragm is not good

Method used

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  • Composite isolating membrane of lithium ion battery and preparation method and application of composite isolating membrane
  • Composite isolating membrane of lithium ion battery and preparation method and application of composite isolating membrane
  • Composite isolating membrane of lithium ion battery and preparation method and application of composite isolating membrane

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preparation example Construction

[0050]The invention discloses a preparation method of a lithium-ion battery composite separator, which comprises the following steps:

[0051] 1) Preparation of silicon dioxide modified with double bonds on the surface: take silicon dioxide particles with a particle size of 20-500 nm and a silane coupling agent containing double bonds and place them in ethanol, propanol, propylene glycol, deionized water or toluene, Under the action of a catalyst, reflux at 120°C, and undergo hydrolysis and condensation reactions to prepare silica with double bond modification on the surface;

[0052] 2) Preparation of organic / inorganic hybrid polymer: take the silicon dioxide with double bond modification on the surface prepared in step 1) and put it in a reaction vessel, add solvent cyclohexanone, toluene or N,N-dimethylformaldehyde in sequence Amides, organic functional monomers, and initiators are stirred by magnetic force and reacted in a silicone oil bath at 90°C for 12 to 48 hours. Afte...

Embodiment 1

[0056] This embodiment discloses a kind of preparation method of lithium-ion battery composite separator, and it comprises the steps:

[0057] 1) Preparation of silica with double bond modification on the surface: take silica particles with a particle size of 200nm and silane coupling agent vinyltrimethoxysilane in toluene, under the catalysis of dilute hydrochloric acid, control the reaction temperature at 120°C Reflux for 12 hours, and undergo a hydrolysis and condensation reaction to obtain silicon dioxide modified with double bonds on the surface;

[0058] 2) Preparation of organic / inorganic hybrid polymer: take the silicon dioxide with double bond modification on the surface prepared in step 1) and put it in a reaction vessel, add solvent cyclohexanone, methyl methacrylate, butyl methacrylate in sequence Esters, using azobisisobutyronitrile as an initiator, reacted in a silicone oil bath at a controlled reaction temperature of 120°C for 12 hours, and then underwent precip...

Embodiment 2

[0062] This embodiment discloses a kind of preparation method of lithium-ion battery composite separator, and it comprises the steps:

[0063] 1) Preparation of silica with double bond modification on the surface: take silica particles with a particle size of 150nm and silane coupling agent vinyltrimethoxysilane in toluene, under the catalysis of dilute hydrochloric acid, control the reaction temperature at 120°C Reflux for 12 hours, and undergo a hydrolysis and condensation reaction to obtain silicon dioxide modified with double bonds on the surface;

[0064] 2) Preparation of organic / inorganic hybrid polymer: take the silicon dioxide with double bond modification on the surface prepared in step 1) and place it in a reaction vessel, and add solvent cyclohexanone, methyl methacrylate, and methacrylate in sequence , using azobisisobutyronitrile as an initiator, reacting in a silicone oil bath at a controlled reaction temperature of 120°C for 24 hours, and then undergoing precip...

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Abstract

The invention discloses a composite isolating membrane of a lithium ion battery and a preparation method and application of the composite isolating membrane, and belongs to the technical field of lithium ion batteries. The composite isolating membrane comprises an organic / inorganic hybrid polymer bonding layer and porous base membranes positioned at the upper end and the lower end of the organic / inorganic hybrid polymer bonding layer, wherein the organic / inorganic hybrid polymer bonding layer is a copolymer of modified silicon dioxide and an organic functional monomer, the modified silicon dioxide is silicon dioxide of which the surface is modified by double bonds, and the structural formula of the organic functional monomer comprises at least one of unsaturated double bonds or triple bonds. The composite isolating membrane designed by the invention is good in thermal stability and excellent in air permeability, and the lithium ion battery prepared from the composite isolating membraneis relatively good in cycling stability.

Description

technical field [0001] The invention relates to a separator located between positive and negative electrodes in a lithium-ion battery, and belongs to the technical field of lithium-ion batteries, in particular to a lithium-ion battery composite separator and its preparation method and application. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products such as mobile phones and notebook computers, which have caused a lot of research and development. Compared with nickel-cadmium and nickel-metal hydride batteries, it has the advantages of high energy density, long life and high voltage. In the actual application process, consumers are more concerned about energy density and safety, which requires lithium-ion batteries to have high safety and reliability under relatively harsh conditions (such as impact, nail penetration, and hot box). Lithium-ion batteries consist of positive and negative electrodes, a separator, and an electrolyte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525H01M50/446H01M50/403H01M50/449Y02E60/10
Inventor 杨梢马卫张天赐陆玉明陈中华陈刚华诚江长清孙伟兵
Owner 湖北锂诺新能源科技有限公司
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