Preparation method of negative electrode lithium-supplementing high-nickel lithium ion power cell

A technology of high-nickel lithium and power electricity, which is applied in the manufacture of electrolyte batteries, circuits, electrical components, etc., can solve the problems of cell safety and poor lithium supplementation effect, and achieve the effect of solving poor lithium supplementation effect and improving Coulombic efficiency

Inactive Publication Date: 2019-05-10
龙能科技(宁夏)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most important lithium supplementation method is to add lithium powder in the negative electrode pulping process. Although this method can i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The positive electrode is made of high-nickel ternary LiNi 0.8 co 0.1 mn 0.1 o 2 The material is 97% by mass; the conductive agent is selected from carbon nanotubes, and the mass ratio is 0.8%; the binder is selected from polyvinylidene fluoride, and the mass ratio is 2.2%. After the above-mentioned materials are made into slurry according to a certain production process; coated on the current collector; and die-cut into a positive electrode sheet of a certain size after rolling.

[0022] The negative electrode is silicon-carbon negative electrode containing 6% silicon dioxide by mass ratio, and the mass ratio is 95%; the conductive agent is a mixture of carbon nanotubes and conductive carbon black, and the mass ratio is 0.5% of carbon nanotubes and 1.0% of conductive carbon black; The agents are: styrene-butadiene rubber and sodium carboxymethyl cellulose, the mass ratios are 2% and 1.5% respectively. After the above-mentioned materials are made into slurry accordi...

Embodiment 2

[0025] The positive electrode sheet is consistent with the positive electrode sheet in Example 1.

[0026] The negative electrode is made of silicon carbon negative electrode containing 10% silicon dioxide by mass ratio, with a mass ratio of 95.4%; the conductive agent is selected from carbon nanotubes, with a mass ratio of 0.8%; 2.0% and 1.8%. After the above-mentioned materials are made into slurry according to a certain production process, they are coated on the current collector; in the rolling stage, the 4 μm lithium sheet and the negative electrode sheet are rolled together so that both sides of the negative electrode sheet are evenly bonded. A layer of lithium sheet is attached; after rolling, it is die-cut into a negative electrode sheet of a certain size.

[0027] The energy density of the lithium-ion battery made of the above-mentioned positive and negative electrode sheets reaches 300Wh / Kg, which is 20% higher than that of the lithium-ion battery without lithium su...

Embodiment 3

[0029] The positive electrode is made of high-nickel ternary LiNi 0.8 co 0.1 Al 0.1 o 2 The material is 97.2% by mass; the conductive agent is a mixture of carbon nanotubes and carbon fibers, and the mass ratio is 0.5% of carbon nanotubes and 0.3% of carbon fibers; the binder is polyvinylidene fluoride, and the mass ratio is 2%. After the above-mentioned materials are made into slurry according to a certain production process; coated on the current collector; and die-cut into a positive electrode sheet of a certain size after rolling.

[0030] The negative electrode sheet is consistent with the negative electrode sheet in Example 2.

[0031] The energy density of the lithium-ion battery made of the above-mentioned positive and negative electrode sheets reaches 300Wh / Kg, which is 20% higher than that of the lithium-ion battery without lithium supplementation.

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Abstract

The invention discloses a preparation method of a negative electrode lithium-supplementing high-nickel lithium ion power cell; according to the method disclosed by the invention, a positive electrodehigh-nickel material can be made to play the optimal performance by adjusting the proportion; the preparation method of the negative electrode lithium-supplementing lithium ion power cell comprises the following steps of coating a negative electrode slurry on a negative electrode current collector to obtain a negative plate, and then, carrying out rolling on the negative plate, wherein during rolling, two metal lithium sheets are placed on the two sides of the negative plate for rolling respectively. According to the preparation method, when the coated negative plate is rolled, and the metal lithium sheets are pressed on the two surfaces of the negative plate, so that the initial coulombic efficiency of the single lithium ion cell and the specific energy density of the cell are improved. The specific energy of the single lithium ion power battery is 300 Wh/kg or above.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to the technical field of lithium-ion batteries, and in particular to a preparation method of a negative-electrode lithium-supplementing high-nickel lithium-ion power cell. Background technique [0002] With the development of electric vehicle technology, lithium-ion battery cells are required to have the characteristics of high initial efficiency and high energy density. By 2020, the specific energy of a new type of lithium-ion power battery will exceed 300Wh / kg. Although the performance of the existing negative electrode materials has been continuously improved, it is difficult to meet the first Coulombic efficiency of the existing negative electrode materials if the specific energy of a single power battery exceeds 300Wh / kg. Therefore, it is necessary to supplement lithium at the negative electrode to improve the specific energy of lithium-ion power battery cells. At present,...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/058
CPCY02E60/10Y02P70/50
Inventor 张琦胡琪卉文亚洲
Owner 龙能科技(宁夏)有限责任公司
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