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Lithium-ion battery bare cell and preparation method of lithium-ion battery containing the bare cell

A technology of lithium-ion batteries and bare cells, applied in the field of lithium-ion batteries, can solve the problems of poor structural consistency, uncontrollability, poor cycle performance of cells, etc., and achieve excellent cycle performance

Active Publication Date: 2017-03-29
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned methods of improving the first-time efficiency of the battery through lithium-rich means, and then increasing the battery capacity, in the battery preparation process, after the liquid injection, with the infiltration of the electrolyte, ion channels and electrons are formed between the lithium-rich material and the lithium-rich electrode. When channeling, a solid electrolyte film (SEI film) will be spontaneously formed on the surface of the lithium-rich material particles. The film formation process of the SEI film is an uncontrollable process, and the formed SEI film has poor composition and structure consistency. Poor cycle performance

Method used

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  • Lithium-ion battery bare cell and preparation method of lithium-ion battery containing the bare cell

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1, different from Comparative Example 2, this embodiment comprises the following steps:

[0032] Composite isolation membrane preparation: choose the metal lithium strip as the lithium-rich material, punch it, the shape of the hole is circular, the hole diameter is 0.4cm, and the hole spacing is 1cm, and then rolling, so that the burrs on the metal lithium strip are smaller than 5um; after that, it is compounded with a separator with a thickness of 12um, and the composite surface pressure is 1MPa, and finally a composite separator is obtained.

[0033] Preparation of battery cells to be formed: choose silicon-carbon composites as the anode active material, stir evenly with conductive agent, adhesive and deionized water to obtain a slurry, and then coat it on the copper current collector, cold press, slitting, welding, After sticking the glue, dry it for use; choose lithium cobaltate as the cathode active material, stir it with conductive agent, adhesive and n...

Embodiment 2

[0037] Embodiment 2, different from Embodiment 1, this embodiment includes the following steps:

[0038] Composite isolation membrane preparation: choose the metal lithium strip as the lithium-rich material, punch it, the shape of the hole is circular, the hole diameter is 4cm, the hole spacing is 4cm, and then rolling, so that the burr on the metal lithium strip is less than 20um ; After that, it is compounded with a separator with a thickness of 50um, and the composite surface pressure is 10MPa, and finally a composite separator is obtained.

[0039] Preparation of batteries to be formed: same as in Example 1.

[0040] SEI film formation: chemically form the above-mentioned fully wetted cells at 90°C, apply a pressure of 0.5MPa, charge a current of 5C, and charge a SOC of 60%, so that an SEI film is formed on the surface of the anode.

[0041] Lithium intercalation: Apply a surface pressure of 5 MPa to the above-mentioned cells forming the SEI film, and then place them in a...

Embodiment 3

[0043] Embodiment 3, different from Embodiment 1, this embodiment includes the following steps:

[0044] Composite isolation membrane preparation: select the metal lithium strip as the lithium-rich material, punch it, the shape of the hole is circular, the hole diameter is 2cm, the hole spacing is 2cm, and then rolling, so that the burr on the metal lithium strip is less than 10um ; After that, it is compounded with a separator with a thickness of 20um, and the composite surface pressure is 3MPa, and finally a composite separator is obtained.

[0045] Preparation of batteries to be formed: same as in Example 1.

[0046] SEI film formation: chemically form the above-mentioned fully wetted cells at 85°C, apply a pressure of 0.1MPa, charge a current of 1C, and charge a SOC of 50%, so that an SEI film is formed on the surface of the anode.

[0047] Lithium intercalation: Apply a surface pressure of 2MPa to the above-mentioned cells forming the SEI film, and then place them in an ...

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Abstract

The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a bare cell of a lithium-ion battery: comprising a cathode sheet, a separator and an anode sheet, and the separator is interposed between the cathode sheet and the anode sheet; it is characterized in that the The separator is a composite separator whose surface is compounded with a porous structure layer composed of lithium-rich material, and the porous structure layer of lithium-rich material is located between the separator and the cathode. The lithium-ion battery prepared by using the bare cell of the present invention can effectively slow down / inhibit the lithium in the lithium-rich material layer from being embedded in the cathode active material particles during the infiltration process of the electrolyte, thereby destroying the structure of the cathode active material particles and reducing the / Eliminate the formation of SEI film with poor consistency in the internal structure and performance of the anode; finally obtain a lithium-rich lithium-ion battery with better capacity and cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery bare cell and a preparation method of a lithium-ion battery containing the bare cell. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high voltage, low self-discharge and light weight, so they are widely used in various portable mobile electronic devices such as notebook computers, digital cameras, mobile phones, and MP3 players. With the miniaturization and multi-function development of portable mobile electronic devices, people have higher and higher requirements on the energy density of lithium-ion secondary batteries. Since the lithium-ion battery needs to form a solid electrolyte (SEI) film during the formation process, it consumes the Li provided by the cathode. + , which brings the capacity loss of the battery and affects the improvement of energy density. For the graphite sys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M2/16H01M10/058H01M50/446H01M50/449H01M50/491
CPCH01M10/0525H01M10/058H01M2220/30H01M50/409Y02E60/10Y02P70/50
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH