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A kind of negative electrode sheet and preparation method thereof

A technology of negative pole piece and negative pole, which is applied in the field of negative pole piece and its preparation, can solve the problems of fast decay of cycle life and poor compatibility, and achieve the effects of improving ion conductivity, controllable thickness, and reducing side reactions

Active Publication Date: 2021-12-10
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of coating layer has poor compatibility with solid electrolytes, and while improving battery safety performance, the cycle life of the material decays rapidly

Method used

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  • A kind of negative electrode sheet and preparation method thereof
  • A kind of negative electrode sheet and preparation method thereof

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Comparison scheme
Effect test

preparation example Construction

[0039] The invention provides a preparation method of a negative pole piece, comprising the following steps:

[0040] S1. In parts by weight, mix 87-97 parts of negative electrode active materials and 1-10 parts of solid electrolyte, and perform mechanical ball milling. The mechanical ball milling is carried out under vacuum conditions. After the mechanical ball milling, add in a solvent and stir, and then perform ultrasonic treatment in sequence , Filtration, washing and drying operations to obtain the negative electrode composite material, where the solvent can be selected from acetone, acetonitrile, dimethylformamide, tetrahydrofuran, toluene, and the final material needs to be fully dispersed and mixed uniformly;

[0041] Dissolve the prepared negative electrode composite material, 0.1-5 parts of conductive agent, 0-4 parts of thickener and 1-4 parts of binder in 90-130 parts of organic dispersant to obtain slurry, and coat the slurry On the current collector, the coating ...

Embodiment 1

[0054] A method for preparing a negative pole piece, comprising the following steps:

[0055] S1. Mix 90g of negative electrode active material and 4.5g of solid electrolyte and then carry out mechanical ball milling. The mechanical ball milling is carried out under vacuum conditions. After mechanical ball milling, add 270g of solvent acetonitrile to stir, and then perform ultrasonic treatment, filtration, washing and drying operations in sequence to obtain negative electrode composite materials. ;

[0056] Disperse the prepared negative electrode composite material, 3g conductive agent, and 2g binder in 101.5g organic dispersant, and coat the slurry on the current collector with a coating amount of 15mg / cm 2 , drying under vacuum conditions, the drying temperature is 100°C, and the drying time is 5h to form the negative electrode substrate, and place the negative electrode substrate on the sample stage in the vacuum chamber;

[0057] S2. Make lithium phosphate as a target fo...

Embodiment 2

[0061] A method for preparing a negative pole piece, comprising the following steps:

[0062] S1. Mix 87g of negative electrode active material and 1g of solid electrolyte, and perform mechanical ball milling. The mechanical ball milling is carried out under vacuum conditions. After mechanical ball milling, add 174g of solvent (acetone) to stir, and then perform ultrasonic treatment, filtration, washing and drying operations in sequence to obtain negative electrode composite Material;

[0063] Dissolve the prepared negative electrode composite material, 1 g of conductive agent and 1 g of binder in 90 g of organic dispersant to obtain a slurry, and coat the slurry on the current collector with a coating amount of 5 mg / cm 2 , drying under vacuum conditions, the drying temperature is 80°C, and the drying time is 10h to form the negative electrode substrate, and place the negative electrode substrate on the sample stage in the vacuum chamber;

[0064] S2. Make lithium phosphate a...

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Abstract

The invention discloses a negative electrode sheet and a preparation method thereof, comprising a current collector, a negative electrode composite material layer arranged on the current collector, and a coating layer deposited on the negative electrode composite material layer by a pulse laser method. The negative electrode composite material layer consists of A solid electrolyte and a negative electrode active material are prepared; the negative electrode active material is a carbon negative electrode material, and the material of the coating layer is selected from lithium phosphate, lithium silicate or lithium vanadate; the preparation method includes the following steps: S1, combining the negative electrode active material and the solid state The electrolyte is mixed into a negative electrode composite material, and after mechanical ball milling, a conductive agent, a binder and an organic dispersion solvent are added to prepare a slurry, which is coated on a current collector and dried to form a negative electrode substrate; S2. Lithium phosphate or Lithium silicate is made into a target, and lithium phosphate or lithium silicate is deposited on the negative electrode substrate. After the deposition is completed, it is cooled to obtain a coating layer with a thickness of 1-100nm, and the negative electrode material is obtained. The invention has the advantages of long cycle life and improved safety performance of the battery.

Description

technical field [0001] The invention relates to the technical field of battery materials, more specifically, it relates to a negative electrode sheet and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been rapidly and widely used in portable electronic devices, power batteries and energy storage systems due to their high operating voltage, no memory effect, and high energy density. At present, the anode materials used in the lithium-ion battery market are mainly carbon anode materials, because they have excellent characteristics such as stable structure, low and stable lithium intercalation potential, and high theoretical capacity. Volume expansion will occur, resulting in the destruction of the layered structure, causing the battery cycle performance to decay too quickly. Moreover, when the battery is charged and discharged at a high rate or at low temperature, lithium ions will gradually accumulate on the surface of the negative elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/58H01M4/62H01M10/0525H01M10/0562H01M10/42
CPCH01M4/366H01M4/364H01M4/5825H01M4/485H01M4/628H01M10/0525H01M10/0562H01M10/4235H01M2004/027Y02E60/10
Inventor 许晓雄张永龙魏引利陈董亮吴云峰丁超徐礼虎
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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