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A kind of electrode, preparation method and lithium ion battery

An electrode and conductive carbon technology, applied in the fields of electrodes, lithium ion batteries, and preparation, can solve the problems of decreased electrode performance, increased ionic and electronic barriers, and damage to battery cycle performance.

Active Publication Date: 2021-09-14
SHANGHAI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are a series of problems in the preparation of thick electrodes. The increase of electrode thickness will make the transmission path of lithium ions and electrons longer, which will increase the hindrance of ions and electrons during the transmission process. When using traditional coating When the electrode is prepared by the method, the performance of the electrode with a thickness of 100 μm has been significantly reduced and serious pulverization has occurred
[0003] The traditional preparation method of lithium-ion battery electrodes is to use slurry preparation and metal foil surface coating. When the solvent volatilizes inside the electrode, a large number of cavities and loose structures are generated. Therefore, when the thickness is greater than 100 μm, problems such as electrode cracking and powdering are easy to occur. It has great damage to the cycle performance of the battery, so it is impossible to prepare a battery with high energy density by this method

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  • A kind of electrode, preparation method and lithium ion battery
  • A kind of electrode, preparation method and lithium ion battery
  • A kind of electrode, preparation method and lithium ion battery

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preparation example Construction

[0037] The second aspect of the present invention provides a method for preparing an electrode, which is prepared by cold sintering, comprising: providing an aqueous solution of a binder, dispersing an active material, a solid electrolyte, and conductive carbon in the aqueous solution, and pouring the mixture into The mold is sintered at a temperature of ≤200°C.

[0038] The electrode preparation method provided by the second aspect of the present invention includes one or more of the following technical features:

[0039] A1) Under the pressure of 400-800MPa,

[0040] A2) Heating at 4-6°C / min,

[0041] A3) Sintering at 150-200°C,

[0042] A4) keep warm for 20-60 minutes,

[0043] A5) cooling.

[0044]The electrode preparation method provided by the second aspect of the present invention may further include the step of spraying the obtained electrode sheet with gold for 2-8 minutes and then drying at 60-80° C. to completely remove moisture. The purpose of this step is to ...

Embodiment 1

[0067] Weigh 18g of deionized water and 2g of polyethylene oxide (PEO) to prepare a 10% polyethylene oxide aqueous solution. Weigh 2g of the above solution into a mortar, add 3.2g lithium cobalt oxide (LCO), 0.4g lithium lanthanum zirconium gallium oxide (LLZGO) powder, 0.2g superconducting carbon black (ECP600JD) and 0.5g deionized water, stir Mix for 20min. Take 0.3 g of the mixed slurry and put it into a mold, pressurize at 570 mPa and raise the temperature to 180 °C at a rate of 5 °C / min and keep it for 30 min, then cool naturally to obtain an electrode sheet with a thickness of about 400 μm. Polish the surface of the electrode sheet until it is smooth, spray gold for 5 minutes and dry it in a vacuum oven at 60°C for 24 hours, then put it in an argon glove box and dry it at 80°C for 2 hours.

Embodiment 2

[0069] Weigh 9 g of deionized water and 1 g of polyethylene oxide (PEO) to prepare a 10% polyethylene oxide aqueous solution. Weigh 1g of the above solution into a mortar, add 1.6g lithium cobalt oxide (LCO), 0.2g lithium lanthanum zirconium gallium oxide (LLZGO) powder, 0.1g superconducting carbon black (ECP600JD) and 0.3g deionized water, stir Mix for 10 min. Take 0.5 g of the mixed slurry and put it into a mold, pressurize at 570 mPa and raise the temperature to 200 °C at a rate of 6 °C / min and keep it for 30 min, then cool naturally to obtain an electrode sheet with a thickness of about 600 μm. Polish the surface of the electrode sheet until it is smooth, spray gold for 5 minutes and dry it in a vacuum oven at 60°C for 24 hours, then put it in an argon glove box and dry it at 80°C for 2 hours.

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Abstract

The invention relates to the technical field of batteries, in particular to an electrode, a preparation method and a lithium ion battery. The electrode includes active material, solid electrolyte, conductive carbon and binder, and the mass ratio of the active material, solid electrolyte, conductive carbon and binder is 5-8:1-3:0.5-1.5:0.2-1.5 , the thickness of the electrode is 300-1500 μm, the electrode is prepared by cold sintering method, and the sintering temperature is ≤200°C. The invention adopts the cold sintering method to prepare the electrode, the electrode is sintered into a dense whole, has a very high tap density and loading capacity, is conducive to the transmission of lithium ions, and does not use large pollution and high price in the whole process. Organic solvents use water as a solvent and sinter at a low temperature below 200°C, which has the advantages of environmental protection, energy saving, and economy.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an electrode, a preparation method and a lithium ion battery. Background technique [0002] With the rapid development of electric vehicles and various electronic products, people are increasingly dissatisfied with a series of shortcomings such as poor safety, low energy density, high price, and large pollution in the preparation process of traditional lithium-ion battery systems. Increasing the electrode thickness and active material loading is one of the effective ways to increase the energy density. Increasing the electrode thickness can effectively increase the proportion of active material to the total mass of the battery, and can greatly reduce the cost of battery preparation. However, there are a series of problems in the preparation of thick electrodes. The increase of electrode thickness will make the transmission path of lithium ions and electrons longer, which will i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/62H01M10/0525H01M10/058
CPCH01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/622H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 刘巍吴昕晟
Owner SHANGHAI TECH UNIV