Negative electrode of secondary battery and preparation method thereof, and secondary battery

A secondary battery and negative electrode technology, applied in the direction of electrode manufacturing, battery electrodes, electrode carriers/collectors, etc., can solve problems such as complex process routes, achieve simple process routes, facilitate large-scale production and application, and realize light and thin effect

Pending Publication Date: 2019-02-26
CHINA ENERGY LITHIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In secondary batteries with lithium as the negative electrode, the current process used to prepare the negative electrode of the battery is to first prepare the ultra-thin lithium strip, and then combine the ultra-thin lithium strip and the current collector through a special process. The process route is complicated; the ultra-thin lithium The thinnest commercially available tape is 50 microns. For secondary batteries with lithium as the negative electrode, the thickness of 50 microns is still slightly thicker.

Method used

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  • Negative electrode of secondary battery and preparation method thereof, and secondary battery
  • Negative electrode of secondary battery and preparation method thereof, and secondary battery
  • Negative electrode of secondary battery and preparation method thereof, and secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The current collector copper foil (Lingbao Huaxin Copper Foil Co., Ltd., thickness 10 microns, the same below) is coated with 30 microns thick lithium on both sides as the negative electrode; the positive electrode active material uses elemental sublimed sulfur (Nanjing reagent) and graphene ( Chinese Academy of Sciences Chengdu Organic Chemistry Co., Ltd., a mixture of purity greater than 97wt%, diameter less than 6um (graphene doping is 5%), conductive agent activated carbon (Shenzhen Kejing Zhida Technology Co., Ltd., the same below), bonding PVDF (polyvinylidene fluoride, Zhejiang Funuolin New Chemical Material Co., Ltd., the same below), positive electrode active material: activated carbon: binder in a mass ratio of 8:1:1, add solvent NMP (Shanghai Aladdin Biochemical Technology Co., Ltd., the same below), mixed into a slurry, coated on a current collector aluminum foil (Gongyi Tianlong Aluminum Co., Ltd., thickness 10 microns, the same below) to prepare a positive e...

Embodiment 2

[0045] Take 20 micron lithium plated on both sides of the current collector copper foil as the negative electrode; weigh 20 mg of activated carbon and 15 mg of PTFE in an agate mortar, then add 1.5 ml of N-methylpyrrolidone as a solvent, and grind for 30 minutes . The uniformly mixed sample was scraped on a glass plate by scraping, with a scraper thickness of 200 microns, and dried in natural air for 5 hours, and then dried in a vacuum drying oven at 80°C for 12 hours to prepare a positive electrode active material film, and then use 20MPa The positive electrode active material film is compounded on the current collector foam nickel (thickness: 0.25mm, Jiangsu Geye New Material Technology Co., Ltd.) to obtain the lithium oxygen battery positive electrode. Electrolyte uses 1M LiPF 6 EC / DMC / EMC (vol 1 / 1 / 1, EC: ethylene carbonate, DMC: dimethyl carbonate, EMC: ethyl methyl carbonate, Dongguan Shanshan Battery Material Co., Ltd., the same below), the separator is glass fiber Membr...

Embodiment 3

[0047] Solid electrolyte preparation: press 75Li 2 S (Bai Lingwei Technology): 25P 2 S 5 (Nanjing Reagent) The stoichiometric ratio is placed in a ball milling tank and mixed uniformly, and high-energy ball milling is performed at 500 rpm for 15 hours to obtain the LPOS amorphous precursor. Then the precursor is placed in a muffle furnace at 250 ℃ for heat treatment for 6 hours to obtain Li 3 PS 4 Glass ceramic electrolyte.

[0048] According to the positive electrode active material NCA (Nickel Cobalt Aluminum Ternary Material, Shenzhen Beiterui New Energy Material Co., Ltd.): activated carbon: PVDF = 8:1:1 ratio (mass ratio), solvent NMP, stir evenly, and paste The material is coated on a 10-micron aluminum foil and dried in a vacuum drying oven at 60°C for 24 hours for use; the negative electrode is a product with 35 micron thick lithium plated on both sides of the current collector; the positive electrode, solid electrolyte, and negative electrode are assembled into a battery f...

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Abstract

The invention provides a negative electrode of a secondary battery and a preparation method thereof, and the secondary battery. The negative electrode of the secondary battery is composed of a currentcollector and a lithium film and/or a lithium composite film located on one or both sides of the current collector, wherein the thickness of the lithium film or the lithium composite film is no lessthan 1 [mu]m and less than 40 [mu]m. The preparation method for the negative electrode of the secondary battery comprises a step of forming the lithium film and/or lithium composite film on one side or both sides of a current collector by vacuum plating. Films with different thicknesses can be plated directed at different battery systems so as to give full play to the capacity of metallic lithiumor a lithium composite material.

Description

Technical field [0001] The invention relates to the field of secondary batteries, in particular to a new type of secondary battery negative electrode with a simple preparation process and a secondary battery using the negative electrode. Background technique [0002] In recent years, with the demand for high-energy chemical power supplies from electrical products such as smart phones, tablet computers, and electric vehicles, [0003] Demand, as well as the non-renewable petroleum and coal resources and the environmental pollution of burning fossil resources, secondary batteries with high energy density have become a research focus. At present, secondary batteries that use graphite as the negative electrode and lithium iron phosphate, lithium cobalt oxide, and ternary materials as the positive electrode have limited space for specific energy development and almost reach the limit. Among the lithium secondary batteries, metallic lithium has the most negative electrode potential (-3....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/38H01M4/58H01M4/66
CPCH01M4/0423H01M4/366H01M4/382H01M4/58H01M4/661H01M4/667Y02E60/10
Inventor 郇庆娜陈强牟瀚波贾振勇
Owner CHINA ENERGY LITHIUM
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