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Method for protecting metal negative electrode by double-layered membrane

A metal anode, double-layer film technology, applied in battery electrodes, electrode carriers/current collectors, electrical components, etc., can solve the problems of inability to fundamentally eliminate dendrite growth, complicated and difficult technology, and large interface resistance. The effect of improving stability, low cost and simple preparation process

Active Publication Date: 2018-07-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problems of poor safety, high interface resistance, inability to fundamentally eliminate dendrite growth and cumbersome technical difficulties in the existing method for inhibiting lithium dendrite growth, thereby providing a double-layer film to protect the metal negative electrode The method, that is, the nano-powder layer can effectively eliminate dendrites, and the composite film layer can prevent dendrites from piercing and improve the safety and stability of the battery

Method used

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  • Method for protecting metal negative electrode by double-layered membrane
  • Method for protecting metal negative electrode by double-layered membrane
  • Method for protecting metal negative electrode by double-layered membrane

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specific Embodiment approach 1

[0021] Specific embodiment one: In this embodiment, a method for protecting a metal negative electrode with a double-layer film is carried out according to the following steps:

[0022] 1. Preparation of composite film: Add nano-powder material into the mixed solution, ultrasonically disperse for 0.5-2 hours, and then magnetically stir for 12-24 hours to obtain a suspension; use a homogenizer to spin-coat the suspension on a metal sheet and place it on the The film is dried and peeled off at a temperature of 50-80°C to obtain a composite film; the mixed solution is a mixed solution of an organic polymer and DMF, and the mass ratio of the organic polymer to DMF is 1:10 , wherein the organic polymer is PVDF-co-HFP, EO, PEO, PVDF, PAN or PMMA; the mass ratio of the nanopowder material to the organic polymer in the mixed solution is (0.01~1):1; the The speed of the homogenizer is 1000-2000 rpm; the thickness of the composite film is 0.5-30 μm;

[0023] 2. Preparation of a double-...

specific Embodiment approach 2

[0024] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the nano-powder material described in step 1 is ZnO nano-powder, TiO 2 Nano powder, NiO nano powder, Ni 2 o 3 Nano powder, Al 2 o 3 Nano powder, Bi 2 o 3 Nano powder, ZnFe 2 o 4 Nano powder or CuBi 2 o 4 Nano-powder; the shape of the nano-powder material is spherical, plate-like, rod-like, angular or sponge-like. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0025] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the nano powder material described in step two is ZnO nano powder, TiO 2 Nano powder, NiO nano powder, Ni 2 o 3 Nano powder, Al 2 o 3 Nano powder, Bi 2 o 3 Nano powder, ZnFe 2 o 4 Nano powder or CuBi 2 o 4 Nano-powder; the shape of the nano-powder material is spherical, plate-like, rod-like, angular or sponge-like. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a method for protecting metal negative electrode by double-layered membrane, relates to the field of lithium metal electrode protection materials and in particular relates to the method for protecting metal negative electrode by double-layered membrane, aiming at solving the problems that an existing lithium dendritic crystal growth inhibition method is lack of safety, the interface resistance is great, the growth of lithium dendritic crystals cannot be eliminated radically and the technical tedious difficulty is relatively great and the like. The method comprises the following steps: 1, preparing an outer-layer protection composite thin membrane; 2, preparing a double-layered protected metal electrode. According to the method provided by the invention, the dendriticcrystals can be effectively eliminated by a nano powder layer and a composite thin membrane layer can be used for preventing the dendritic crystals from piercing, so that the safety and stability ofa battery are improved; the whole body resistance value of an obtained ZnO / (PVDF-HFP)-ZnO double-layered protected lithium metal symmetrical battery is reduced by 80 percent to 97 percent when being compared with that of an unprotected lithium metal symmetrical battery. The lithium metal electrode modified by a double-layered protection material has the advantages that the stability is remarkablyimproved and the lithium dendritic crystals are effectively inhibited. The method for protecting metal negative electrode by double-layered membrane is applied to the fields of preparation and modification of the lithium metal electrodes.

Description

technical field [0001] The invention relates to the field of lithium metal electrode protection materials, in particular to a method for protecting a metal negative electrode with a double-layer film. Background technique [0002] The development of energy storage materials is the internal driving force of modern scientific and technological progress. Energy storage technology plays a pivotal role in electric vehicles, energy storage and, now, robotics. The energy density, volume and shape of the battery directly determine the application range of the power system. For example, lithium-ion batteries with high energy density have made ultra-thin cell phones and notebooks a reality. However, the theoretical capacity of graphite anode used in traditional lithium-ion batteries is small, only 372mAh / g, which limits the further improvement of battery capacity. In recent years, lithium metal anodes have been widely praised by researchers, and are honored as the "holy grail" of e...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/36H01M4/38H01M4/60H01M10/0525
CPCH01M4/362H01M4/38H01M4/60H01M4/667H01M10/0525Y02E60/10
Inventor 张耀辉何一涛张亚鑫吕喆黄喜强
Owner HARBIN INST OF TECH
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