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Lithium-ion battery preparation method and battery prepared

A lithium-ion battery and battery technology, which is applied in the direction of battery electrodes, electrolyte storage battery manufacturing, secondary batteries, etc., can solve the problems of low initial charge and discharge efficiency and low initial discharge capacity, so as to improve the initial charge and discharge efficiency and improve the first discharge Capacity, the effect of increasing energy density

Inactive Publication Date: 2011-08-10
SHENZHEN BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this process, due to the reduction of reversible Li+, the initial discharge capacity is extremely low, resulting in extremely low initial charge and discharge efficiency.

Method used

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  • Lithium-ion battery preparation method and battery prepared
  • Lithium-ion battery preparation method and battery prepared
  • Lithium-ion battery preparation method and battery prepared

Examples

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preparation example Construction

[0028] In the preparation method of the present invention, a layer of SEI film is first formed on the negative electrode sheet, and then assembled with the positive electrode sheet to form a battery. The specific steps are:

[0029] ①Firstly, according to the conventional ratio and process, carry out the negative electrode ingredients, coating and other processes to prepare the negative electrode sheet required by a certain type of ordinary lithium-ion battery, and take a certain size of the separator used by the conventional battery to wrap the negative electrode sheet (in case the lithium ion is not passed through. The diaphragm is directly embedded in the negative electrode sheet), and the negative electrode sheet A required for the experiment is obtained;

[0030] ② Prepare lithium salt, organic solvent and appropriate amount of additives according to the conventional ratio to obtain electrolyte B;

[0031] ③Put pole piece A into solution B, and take a certain amount of m...

Embodiment 1

[0037] 1. Weigh 100g of graphite, 2.5g of conductive agent, 1.5g of dispersant and 4g of thickener and dissolve them in a certain amount of water, and then apply them according to the process requirements of 423048AHJ. After baking, the negative electrode sheet required for the experiment is obtained A;

[0038] 2. Weigh 1mol of LiPF6 and dissolve it in the EC solution to obtain 1mol / L LiPF6 electrolyte solution B, and add one or more of film-forming additives such as VC and PS to make the SEI film formed by the pole piece more uniform and dense;

[0039] 3. Weigh a certain amount of metal lithium sheet according to the capacity ratio, so that the capacity of the lithium sheet should be 1.05-1.1 times that of graphite; remove the oxide layer on the surface as the counter electrode C, and its size is the same as or slightly larger than that of the graphite electrode sheet ;

[0040] 4. Wrap the pole piece A with a separator, and put it into the electrolyte solution containing...

Embodiment 2

[0044] 1. Weigh 100g of graphite, 2.5g of conductive agent, 1.5g of dispersant and 4g of thickener and dissolve them in a certain amount of water, and then apply them according to the process requirements of 423048AHJ. After baking, the negative electrode sheet required for the experiment is obtained A;

[0045] 2. Weigh 1mol of LiPF6 and dissolve it in the solution of EC:DMC=3:7 to obtain 1mol / L LiPF6 electrolyte solution B;

[0046] 3. Weigh a certain amount of metal lithium sheet according to the capacity ratio, so that the capacity of the lithium sheet should be 1.05-1.1 times that of graphite; remove the oxide layer on the surface as the counter electrode C, and its size is the same as or slightly larger than that of the graphite electrode sheet ;

[0047]4. Wrap the pole piece A with a separator, put it together with the counter electrode C into the electrolyte solution containing LiPF6, let it stand for more than 10 hours, charge and discharge the simulated half-cell t...

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Abstract

The invention discloses a lithium-ion battery preparation method. The lithium-ion battery preparation method comprises the steps which are as follows: an anode piece, a cathode piece, and a membrane are assembled together into a battery; before, the anode piece, the cathode piece, and the membrane are together assembled into the battery, an SEI film is formed on the cathode piece. The invention also discloses a lithium-ion battery obtained through the lithium-ion battery preparation method. The lithium-ion battery preparation method reduces the irreversible losses of Li+ during the first charging-discharging process of the lithium-ion battery, improves the first discharging capacity and the first charging-discharging efficiency, and improves the energy density of the lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a manufacturing technology of a high-energy lithium ion battery that can be discharged for a long time and the manufactured lithium ion battery. Background technique [0002] In traditional lithium-ion batteries, after the positive and negative electrodes and the separator are wrapped, the electrolyte is injected. During the pre-charging process, the electrolyte reacts with Li+ to form an insoluble substance that precipitates on the surface of the negative electrode to form a dense SEI film. However, in this process, due to the reduction of reversible Li+, the initial discharge capacity is extremely low, resulting in extremely low initial charge and discharge efficiency. Contents of the invention [0003] The object of the present invention is to address the deficiencies of the prior art and provide a preparation method for a lithium ion battery that can reduce th...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/056H01M4/139
CPCY02E60/12Y02E60/122Y02E60/10Y02P70/50
Inventor 安伟峰
Owner SHENZHEN BAK BATTERY CO LTD
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