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Method for pre-lithiating electrode material of lithium ion battery

A lithium-ion battery and electrode material technology, which is applied in the field of improving the first-week Coulombic efficiency of negative electrode materials, can solve problems such as poor practicability, difficult precise proportioning, and deformation of pole pieces, so as to reduce battery weight, reduce research and development costs, and improve The effect of production efficiency

Inactive Publication Date: 2014-12-10
赵前永
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pre-lithiation of negative electrode materials is currently realized by short-circuiting the negative electrode material and metal lithium. It can only be tested on a small scale in an organic electrolyte under an inert protective atmosphere, and it is difficult to apply it in large-scale production.
The method of preparing three electrodes can also be pre-lithiated, but it will cause deformation of the pole piece, and it is also difficult to accurately match the ratio, and the practicability is not strong

Method used

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  • Method for pre-lithiating electrode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take the natural graphite negative electrode material to make a pole piece and place it in the cathode cavity, and place it in a 6 In the EC / DMC electrolyte, lithium chloride aqueous solution is injected into the anode cavity. Charge and discharge equipment through an external circuit to control the charge and discharge potential and time.

[0017] 1. Stand still for 0.5h;

[0018] 2. Electrolyze with a current density of 100mA / g, and the voltage display is 3.1V;

[0019] 3. Power on for 20 minutes, then power off;

[0020] 4. Let stand for 10 minutes.

[0021] After the charge and discharge control is over, take out the pole piece and mix it with 2.0g LiCO 2 Assemble into a solid battery, let it stand for 1 hour, and test.

Embodiment 2

[0025] The carbon-coated graphite is used to make the negative electrode sheet, wherein the carbon is amorphous carbon from pitch cracking. Since amorphous carbon will irreversibly consume lithium ions in the first week, the graphite material has excellent cycle performance and capacity under normal conditions, with a capacity close to 372mAh / g, but the coulombic efficiency is low in the first week. The material is made into a pole piece and placed in the cathode chamber, which contains 1mol / L LiPF 6 In the EC / DMC electrolyte, the anode is injected with lithium carbonate aqueous solution, and the pole piece is connected to the positive and negative electrodes respectively through the external circuit charge and discharge equipment to control the charge and discharge.

[0026] 1. Stand still for 0.5h;

[0027] 2. Electrolyze with a current density of 100mA / g, and the voltage display is 3.05V;

[0028] 3. Power on for 40 minutes, then power off;

[0029] 4. Let stand for 10 m...

Embodiment 3

[0034] The silicon / carbon anode material produced by Betray Company was used to make pole pieces, the silicon content was 6wt.%, and the remaining components were amorphous carbon and graphite. After 50 cycles, the capacity was 480mAh / g. In the product description of this product, the first week Coulombic efficiency of this material is below 85%. The material is made into a pole piece and placed in the cathode cavity, which contains 1mol / L LiPF 6In the EC / DMC electrolyte, the anode is injected with lithium chloride aqueous solution, and the pole piece is connected to the positive and negative electrodes respectively through the external circuit charge and discharge equipment to control the charge and discharge.

[0035] 1. Stand still for 0.5h;

[0036] 2. Electrolyze with a current density of 150mA / g, and the voltage display is 3.15V;

[0037] 3. Power on for 20 minutes, then power off;

[0038] 4. Let stand for 10 minutes.

[0039] After the charge and discharge control ...

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Abstract

The invention relates to an electrode material of a lithium ion battery, in particular to a method for pre-lithiating a cathode material. The method comprises the steps that an electrolytic cell cathode cavity is made of the electrode material such as a lithium ion cathode material and arranged in a lithium ion conductive organic electrolyte; an anode cavity is an aqueous solution containing lithium salt or an organic solution; the anode cavity is separated from the cathode cavity by a lithium ion conductor ceramic membrane or a composite membrane of lithium ion conductor ceramic and a high molecular material; an electric potential and current density are controlled by external circuit charge and discharge equipment to allow lithium ions to migrate to a cathode from an anode through the membrane; and an SEI (Solid Electrolyte Interphase) membrane is formed on the surface of the material; or the electrode material is pre-lithiated. According to the method, a cheap and safe lithium ion saline solution serves as a source of the lithium ion; the SEI membrane is generated for the cathode of the lithium ion battery in advance; or lithium is supplemented to the electrode material; the coulombic efficiency and cycling stability of the cathode material can be improved; a formation process in production of the lithium ion battery in the prior art is simplified; the electrode material and cost are saved; and the method is safe and efficient and has a large-scale application prospect.

Description

technical field [0001] The invention relates to pre-lithiation of electrode materials for lithium ion batteries, in particular to a method for improving the first-week coulombic efficiency of negative electrode materials that can be used in the production of lithium ion secondary batteries. Background technique [0002] At present, lithium-ion batteries play an increasingly important role in real life and become an indispensable part of electronic products. With the improvement of people's living requirements, higher and higher requirements are put forward for the capacity of lithium-ion batteries. As an important part of lithium-ion batteries, lithium-ion battery anode materials have a significant impact on the performance of lithium-ion batteries. At present, commercial lithium-ion battery anode materials are mainly carbon materials, lithium titanate materials, silicon-carbon materials, etc., and there are still a large number of lithium-ion battery anode materials under ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/058H01M50/403H01M50/489
CPCH01M10/0525H01M10/058H01M50/403H01M50/431H01M50/446H01M50/46Y02E60/10Y02P70/50
Inventor 赵前永
Owner 赵前永
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