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Metal lithium composite structure lithium ion battery negative electrode

A lithium-ion battery, composite structure technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problem of high cost, achieve the effect of low cost, reduced production cost, and thin thickness

Inactive Publication Date: 2017-01-11
WUHAN HONGYANG TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to propose a lithium-ion battery negative electrode with a metal-lithium composite structure, which can prevent the separator of the lithium-ion battery from being pierced by lithium dendrites, and overcome the disadvantages of high product cost in the prior art

Method used

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Embodiment Construction

[0025] to combine figure 1 , figure 2 As shown, the metal lithium fiber film composite structure lithium-ion battery negative electrode uses flake metal lithium 1 as the core material of the lithium-ion battery negative electrode. A barrier layer 2 is provided outside the lithium metal, and the barrier layer 2 of fiber film material covers the lithium metal 1 to prevent lithium dendrites from growing in a direction perpendicular to the barrier layer. The barrier layer 2 of the fibrous film material adopts cellulose paper with a thickness of 10-100 microns, and the preferred thickness of the cellulose paper is 30-50 microns. The porosity of the cellulose paper is 10%-80%, preferably 40-60%, and the pore diameter is 0.01-100 microns, preferably 0.01-20 microns. The cellulose paper shall be fully inspected under an optical microscope, or detected by other means, such as photoelectric signals, and shall not have vertical through holes.

[0026] The above cellulose paper is coa...

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Abstract

The invention discloses a metal lithium composite structure lithium ion battery negative electrode. Metal lithium is used as the core material of the lithium ion battery negative electrode, and the outer surface of the metal lithium opposite to the lithium ion battery diaphragm is covered with barrier lithium dendrites that grow in the direction of the barrier layer. A barrier layer of fibrous film material that is large and prevents the role of piercing the lithium-ion battery separator. The micropores in the barrier layer allow the electrolyte to pass through. The invention is used in conjunction with the positive electrode material of the lithium ion battery, which can effectively prevent the separator from being pierced by lithium dendrites, and more fully exert the electrochemical advantages of metal lithium. While increasing the entire battery capacity, the high current performance of the battery is also improved. The barrier layer of the fiber film material used is light in weight, thin in thickness and low in cost, which can greatly reduce the mass of the negative electrode, reduce the volume and reduce the cost. It is worth promoting the application.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion battery negative electrode. Background technique [0002] The currently widely used negative electrode material for lithium-ion batteries is generally graphite balls. Although many non-graphite negative electrode materials have been researched and developed, the working principle is the same, that is, lithium insertion / delithiation, and the representative materials are tin-based, silicon-based, aluminum-lithium alloys and other materials. Among these anode materials, graphite has relatively high lithium ion transport efficiency but low capacity; other materials have high capacity but low lithium ion transport efficiency. However, even graphite spheres still have obstacles to lithium ion transport due to their lithium intercalation / delithiation working method, that is, the high current performance is still limited. Lithium metal has the advantages of extremely high capacity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M2/16H01M50/44H01M50/449
CPCH01M4/134H01M10/0525H01M50/44H01M50/463Y02E60/10
Inventor 贾志杰
Owner WUHAN HONGYANG TECH DEV