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Ultrathin lithium foil and preparation method thereof

A technology of ultra-thin lithium and foil materials, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve the problem that lithium metal is easy to stick, it is difficult to produce 20 micron thick rolled lithium foil, sticky rolls, etc. question

Pending Publication Date: 2020-09-29
CHINA ENERGY LITHIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The tensile strength limit of metal lithium is 11.8kg / mm 2 , in the production of ultra-thin lithium foil, there is a broken belt; metal lithium is easy to stick, has strong self-welding, and is easy to stick to the roll
Uniform, defect-free rolls of lithium foil 20 microns thick are difficult to produce with current technology

Method used

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  • Ultrathin lithium foil and preparation method thereof
  • Ultrathin lithium foil and preparation method thereof
  • Ultrathin lithium foil and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Use a metal lithium strip with a lithium content of 99.95% and a thickness of 160 microns, auxiliary unwinding and winding devices, roll thinning with organosilicide-coated rolls, the first rolling, and control the rolling compression ratio to 2, Obtaining a lithium strip with a thickness of 80 microns; through the second rolling, controlling the rolling compression ratio to be 2, and preparing a metal lithium strip with a thickness of 40 microns; after the third rolling, controlling the rolling compression ratio is 2, the thickness is 20 microns ultra-thin lithium foil, and the thickness tolerance is ±1 micron. The prepared 20 micron thick lithium foil product and the rolled 20 micron thick lithium foil product such as figure 2 , 3 shown.

Embodiment 2

[0040] The metal lithium strip with a lithium content of 99.93% and a thickness of 130 microns is adopted, with auxiliary unwinding and winding devices, thinning through polyethylene-coated rolls, rolling for the first time, and controlling the rolling compression ratio to be 2 to obtain Thickness is the lithium strip material of 65 microns; Through rolling for the second time, the control rolling compression ratio is 2, and the preparation obtains the metal lithium strip material that thickness is 32 microns; Pass through the 3rd rolling again, the control rolling compression ratio is 2. Obtain an ultra-thin lithium foil with a thickness of 16 microns and a thickness tolerance of ±1 micron. The prepared 16 micron thick lithium foil product and the rolled 16 micron thick lithium foil product such as Figure 4 , 5 shown.

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Abstract

The invention provides an ultrathin lithium foil product and a preparation method thereof. The ultrathin lithium foil is a continuous and self-supporting strip-shaped foil with the lithium content of99.90%-99.99%. The thickness of the ultrathin lithium foil is 10-20 [mu] m, and the width of the ultrathin lithium foil is 10-500 mm. The surface of the ultrathin lithium foil is bright in color and is silvery white; the surface of the lithium foil is smooth, and holes and damage which can be visually observed do not exist; and the lithium foil has neat edges and no defects.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to an ultra-thin lithium foil material that can be used for a secondary battery and a preparation method thereof. Background technique [0002] Lithium batteries are widely used in aerospace, computers, mobile communication equipment, robots and electric vehicles due to their advantages of high energy density, long cycle life and wide temperature range. With the development of society and the advancement of science and technology, the energy density requirements of lithium batteries are getting higher and higher, but the current lithium-ion batteries with graphite as the negative electrode are difficult to meet the expectations of the society, so it is necessary to develop new positive and negative batteries with higher specific capacity. pole material. For anode materials, lithium metal has a high specific capacity (3860mAh / g, 10 times that of graphite anode) and the lowest...

Claims

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Application Information

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IPC IPC(8): H01M4/46H01M10/0525B21B1/40B21B27/02
CPCH01M4/463H01M10/0525B21B1/40B21B27/021Y02E60/10
Inventor 郇庆娜王亚龙齐大志陈强牟瀚波
Owner CHINA ENERGY LITHIUM
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