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Compound membrane for lithium battery, preparation method and application thereof

A technology of composite diaphragm and lithium battery, which is applied in the direction of lithium battery, nanotechnology for materials and surface science, secondary battery, etc., can solve the problems of fragility, SEI rupture, low conductivity, etc., to inhibit growth and reduce Chemical reactions, effects of high energy density

Active Publication Date: 2019-03-01
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic ceramic solid electrolyte has the advantages of wide electrochemical window, non-volatile and non-flammable, which can effectively prevent the side reaction between metal lithium and electrolyte, but it is fragile and not practical; polymer electrolyte has certain flexibility, but Low conductivity, large internal resistance, especially poor performance at room temperature; film-forming additives can form SEI on the surface of metal lithium negative electrodes, but additives are consumable materials. As the additives are exhausted, the uneven deposition of metal lithium will still lead to The SEI ruptures and the dendrites continue to grow

Method used

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  • Compound membrane for lithium battery, preparation method and application thereof
  • Compound membrane for lithium battery, preparation method and application thereof
  • Compound membrane for lithium battery, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-10

[0063] 1. Preparation of Vulcanized Polyacrylonitrile Ion-Conductive Particle Coating

[0064] (a) uniformly mix sulfur element (S) with polyacrylonitrile (PAN) particles purchased from aldrich company, and react in an argon tube furnace at 300° C. to obtain sulfurized polyacrylonitrile ion-conducting particles; wherein, The weight-average molecular weight of polyacrylonitrile particles is 12,000g / mol, the average particle diameter is 10nm, and the mass ratio of sulfur element and polyacrylonitrile is respectively 1:2, 1:1, 2:1, 3:1 and 4: 1.

[0065] (b) After uniformly mixing the vulcanized polyacrylonitrile ion-conducting particles and polyvinylidene fluoride, add N-methyl-2-pyrrolidone (NMP) solvent to prepare a slurry; wherein, by weight of the slurry, the The amount of sulfurized polyacrylonitrile ion-conducting particles is 30%, the amount of polyvinylidene fluoride is 10%, and the amount of N-methyl-2-pyrrolidone is 60%.

[0066] (c) Squeegee-coat the slurry obtained...

Embodiment 11-50

[0092] 1. Preparation of Composite Separator

[0093] Composite membranes were prepared using the methods described in Examples 1-10. Table 2 shows the types of polymer substrate films, and Table 3 shows the types of the positive-side inorganic ceramic particle coating and / or polymer modification layer.

[0094] Table 2 Polymer substrate membrane materials

[0095]

[0096]

[0097] Table 3 Inorganic Ceramic Particle Coating and / or Polymer Modification Layer Particles on the Positive Electrode Side

[0098]

[0099] Table 4 has listed polymer substrate film type, thickness in the composite diaphragm of embodiment 11-50, the raw material ratio before the sintering of negative electrode side vulcanization polyacrylonitrile ion-conductive particle coating, particle size, coating thickness, positive electrode side Inorganic ceramic particle coating or polymer modification layer type, coating thickness, and total porosity of the final composite separator.

[0100] The c...

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Abstract

The invention discloses a compound membrane for a lithium battery, a preparation method and an application thereof. The compound membrane comprises a polymer matrix membrane, a polyacrylonitrile sulfide ionic conductive particle coating located on one side of the polymer matrix membrane and an inorganic ceramic particle coating and / or polymer modifying layer arranged on the other side of the polymer matrix membrane. The compound membrane can be singly used as a lithium battery membrane matched with a conventional electrolyte and also can be used together with a functional electrolyte; the compound membrane can form a solid electrolyte in the manner of formation and can form a quasi-solid or all-solid metal lithium battery; the compound membrane is capable of effectively restraining the growth of lithium dendrites, restraining the puncturing of lithium dendrites to membrane, stopping the lithium dendrites to reach positive pole side, reducing further chemical reaction between metal lithium and electrolyte, effectively protecting a metallic lithium electrode and promoting thermal stability, mechanical stability and safety; the compound membrane is suitable for high-energy density lithium ion batteries, metal lithium batteries and compound metal lithium batteries.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry and new energy materials, and in particular relates to a composite separator for lithium batteries, a preparation method and application thereof. Background technique [0002] In recent years, the rapidly developing electric vehicle and energy storage industries have put forward higher requirements on the energy density, cost, cycle and safety of lithium-ion batteries. Metal lithium-based batteries are considered to be the next-generation high-energy-density lithium battery system. Using metal lithium as the negative electrode can increase the energy density of the battery to 300wh / kg, which can effectively alleviate the mileage anxiety of electric vehicles. [0003] The core problems of metallic lithium as the negative electrode lie in the ultra-high chemical reactivity, uneven lithium deposition, and large volume expansion of metallic lithium. The high chemical reactivity leads to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/052B82Y30/00
CPCB82Y30/00H01M10/052H01M10/0525H01M50/403H01M50/411H01M50/431H01M50/449Y02E60/10
Inventor 彭佳悦李泓陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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