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A kind of preparation method and product of organic-inorganic composite separator for lithium ion battery

A lithium-ion battery and inorganic composite technology, applied in the direction of secondary batteries, battery components, circuits, etc., can solve the problems of unfavorable high-performance separators, etc., to improve ion conductivity, elongation at break and tensile strength, The effect of high thermal stability and strong applicability

Active Publication Date: 2021-02-09
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this scheme, although Li 0.33 La 0.557 TiO 3 The addition of nanowires improves the ionic conductivity of the separator, but the DMF solvent is not conducive to obtaining a high-performance separator with uniform performance during the volatilization process.
In addition, Solarajan et al. (Sci.Rep., 7(2017) 45390) also proposed a PVdF-HFP / ZrO 2 The preparation method of diaphragm, in this scheme by adding ZrO 2 Particles can improve the mechanical strength of the separator, increase thermal stability and ionic conductivity, and promote cycle stability, but the electrochemical stability window is still about 3.4V, which needs to be further improved

Method used

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  • A kind of preparation method and product of organic-inorganic composite separator for lithium ion battery
  • A kind of preparation method and product of organic-inorganic composite separator for lithium ion battery
  • A kind of preparation method and product of organic-inorganic composite separator for lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0047] The organic-inorganic composite diaphragm in this embodiment includes silver nanowires, SiO 2 and polymers. The SiO 2 Wrapped on the surface of silver nanowires; the surface is wrapped with SiO 2 The silver nanowires and polymer are dispersed in a solvent, and processed by electrospinning to finally form the required three-dimensional spatial structure fiber membrane. Wherein, the surface wrapping SiO 2 The silver nanowires are added in a proportion of 1wt% of the polymer.

[0048] The process operation steps of this embodiment are as follows:

[0049] (1) preparing silver nanowires;

[0050] (2) Preparation of surface coated SiO by sol-gel method 2 The silver nanowire; comprises the following steps:

[0051] (2-1) uniformly disperse the silver nanowire obtained in step (1) in the mixed solution of deionized water, ammonia water and ethanol, obtain A dispersion liquid; Wherein, every gram of silver nanowire corresponds to 1000mL ethanol; The molar concentrations...

Embodiment 2

[0058] The organic-inorganic composite diaphragm in this embodiment includes silver nanowires, SiO 2 and polymers. The SiO 2 Wrapped on the surface of silver nanowires; the surface is wrapped with SiO 2 The silver nanowires and polymer are dispersed in a solvent, and processed by electrospinning to finally form the required three-dimensional spatial structure fiber membrane. Wherein, the surface wrapping SiO 2 The silver nanowires are added in a proportion of 3wt% of the polymer.

[0059] The process operation steps of this embodiment are as follows:

[0060] (1) preparing silver nanowires;

[0061] (2) Preparation of surface coated SiO by sol-gel method 2 The silver nanowire; comprises the following steps:

[0062] (2-1) uniformly disperse the silver nanowire obtained in step (1) in the mixed solution of deionized water, ammonia water and ethanol, obtain A dispersion liquid; Wherein, every gram of silver nanowire corresponds to 1000mL ethanol; The molar concentrations...

Embodiment 3

[0069] The organic-inorganic composite diaphragm in this embodiment includes silver nanowires, SiO 2 and polymers. The SiO 2 Wrapped on the surface of silver nanowires; the surface is wrapped with SiO 2 The silver nanowires and polymer are dispersed in a solvent, and processed by electrospinning to finally form the required three-dimensional spatial structure fiber membrane. Wherein, the surface wrapping SiO 2 The silver nanowires are added in a ratio of 5wt% of the polymer.

[0070] The process operation steps of this embodiment are as follows:

[0071] (1) preparing silver nanowires;

[0072] (2) Preparation of surface coated SiO by sol-gel method 2 The silver nanowire; comprises the following steps:

[0073] (2-1) uniformly disperse the silver nanowire obtained in step (1) in the mixed solution of deionized water, ammonia water and ethanol, obtain A dispersion liquid; Wherein, every gram of silver nanowire corresponds to 50mL ethanol; The molar concentrations of 100...

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Abstract

The invention belongs to the related field of lithium-ion battery materials, and discloses a method for preparing an organic-inorganic composite diaphragm for lithium-ion batteries, comprising: preparing silver nanowires; sol-gel method wrapping the surface of silver nanowires with inorganic insulating materials ; Disperse the obtained silver nanowires and polymers whose surface is uniformly wrapped with inorganic insulating materials in a solvent to form a spinning solution; use an electrospinning process to prepare an organic-inorganic composite diaphragm. The invention also discloses corresponding products. Through the present invention, the obtained lithium-ion battery separator has high thermal stability, good mechanical properties, good fiber continuity, small fiber membrane pore size, high liquid absorption rate and porosity, and the assembled battery has a wide electrochemical stability window , high ionic conductivity, good cycle performance and excellent rate capability. The process method is simple to operate and easy to control, and is conducive to improving the market application prospect of lithium-ion batteries.

Description

technical field [0001] The invention belongs to the related field of lithium-ion battery materials, and more specifically relates to a preparation method of an organic-inorganic composite separator for lithium-ion batteries and a product thereof. Background technique [0002] In 1991, Sony Corporation of Japan introduced LiCoO 2 It is the first time to realize the commercialization of secondary rechargeable and dischargeable lithium-ion batteries as the positive electrode material and graphite as the negative electrode material. The charging and discharging function of lithium-ion batteries mainly depends on the transmission of lithium ions between the positive and negative electrodes, which can effectively avoid the dendrite problem caused by the lithium deposition and oxidation process, and exhibit excellent cycle characteristics. Lithium-ion battery is mainly composed of five parts: positive electrode, negative electrode, electrolyte, diaphragm and battery case. At pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/44H01M50/446H01M10/0525D01F1/10D04H1/4382D04H1/728H01M50/489H01M50/491H01M50/494H01M50/497
CPCH01M10/0525D04H1/4382D04H1/728D01F1/10H01M50/446H01M50/403Y02E60/10
Inventor 薛志刚甘辉辉左偲张永于丽平周兴平解孝林
Owner HUAZHONG UNIV OF SCI & TECH