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Gradient cathode piece and lithium ion battery preparation method with same

A negative electrode pole piece and gradient technology, which is applied in the field of gradient negative pole piece and the preparation of lithium ion batteries, can solve the problems of volume expansion of alloy negative pole piece, deterioration of battery performance, etc.

Active Publication Date: 2013-07-17
韩志娟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a gradient negative pole piece, aiming at alleviating the problems of volume expansion and battery performance degradation of the alloy negative pole piece in the lithium-ion battery during charging and discharging.

Method used

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  • Gradient cathode piece and lithium ion battery preparation method with same
  • Gradient cathode piece and lithium ion battery preparation method with same
  • Gradient cathode piece and lithium ion battery preparation method with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The first step gradient slurry layer slurry preparation

[0042] 1) After mixing 45 grams of carbon-silicon alloy, 50 grams of mesophase carbon microspheres, 5 grams of super-P, 3 grams of methyl cellulose (CMC), and 2 grams of styrene-butadiene rubber (SBR), add 1000 grams of water and stir well , adjust the viscosity to 400-600Pa·s, pass through a 200-mesh sieve, and make slurry I.

[0043] 2) Mix 65 grams of carbon-silicon alloy, 25 grams of mesophase carbon microspheres, 4 grams of super-P, 3 grams of methyl cellulose (CMC), 3 grams of styrene-butadiene rubber (SBR), and add 1000 grams of water. Viscosity 400~1000Pa·s, pass through 200 mesh sieve, make slurry II.

[0044] 3) Mix 90 grams of carbon-silicon alloy, 3 grams of super-P, 3 grams of methyl cellulose (CMC), 4 grams of styrene-butadiene rubber (SBR), add 1000 grams of water, mix and stir, adjust the viscosity to 800-1500Pa·s, pass 200 mesh sieve to make slurry III.

[0045] The second step of gradient neg...

Embodiment 2

[0056] The first step gradient slurry layer slurry preparation:

[0057] 1) Mix 40 grams of silicon alloy, 40 grams of artificial graphite, 10 grams of super-P, 2 grams of methyl cellulose (CMC), 3 grams of styrene-butadiene rubber (SBR), and add 1000 grams of water to adjust the viscosity to 400-600Pa ·s, pass through a 200-mesh sieve to make slurry I.

[0058] 2) Mix 65 grams of silicon alloy, 20 grams of artificial graphite, 10 grams of super-P, 3 grams of methyl cellulose (CMC), 2 grams of styrene-butadiene rubber (SBR), and add 1000 grams of water to adjust the viscosity to 400-1000Pa s, pass through a 200-mesh sieve to make slurry II.

[0059] 3) Mix 80 grams of silicon alloy, 10 grams of artificial graphite, 5 grams of super-P, 3 grams of methyl cellulose (CMC), 2 grams of styrene-butadiene rubber (SBR), and add 1000 grams of water to adjust the viscosity to 800-1500Pa ·s, pass through a 200-mesh sieve to make slurry III.

[0060] The second step of gradient negative...

Embodiment 3

[0069] The first step gradient slurry layer slurry preparation:

[0070] 1) Mix 42 grams of tin alloy, 45 grams of natural graphite, 7 grams of super-P, 2 grams of methyl cellulose (CMC), 3 grams of styrene-butadiene rubber (SBR), and add 1000 grams of water to adjust the viscosity to 400-600Pa ·s, pass through a 200-mesh sieve to make slurry I.

[0071] 2) Mix 63 grams of tin alloy, 27 grams of natural graphite, 5 grams of super-P, 3 grams of methyl cellulose (CMC), 2 grams of styrene-butadiene rubber (SBR), and add 1000 grams of water to adjust the viscosity to 400-1000Pa s, pass through a 200-mesh sieve to make slurry II.

[0072] 3) Mix 92 grams of tin alloy, 3 grams of super-P, 3 grams of methyl cellulose (CMC), 2 grams of styrene-butadiene rubber (SBR), add 1000 grams of water, mix and stir, adjust the viscosity to 800-1500Pa·s, and pass 200 Mesh sieve to make slurry III.

[0073] The second step of gradient negative electrode sheet preparation

[0074] 1) Coat the s...

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Abstract

The invention provides a gradient cathode piece and a lithium ion battery preparation method with the same. The gradient cathode piece is prepared by sequentially coating a first size layer, a second size layer and a third size layer on a copper foil, wherein active components in the first size layer, the second size layer and the third size layer increase gradually. A lithium ion battery is prepared with the gradient cathode piece. The gradient cathode piece is easy to industrialize. Inner stress, generated during lithium insertion and lithium removing, of alloy materials of the gradient cathode piece in the lithium ion battery can be controlled effectively, damage, caused by expansion stress, of the gradient cathode piece is lowered greatly, and accordingly wrinkle and breakage of the gradient cathode piece are avoided, and performances such as multiplying power and capacity retention ratio of the lithium ion battery are increased effectively.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a gradient negative electrode sheet and a preparation method for a lithium ion battery thereof. Background technique [0002] In the field of lithium-ion battery anode material preparation, alloy materials have become the development direction of a new generation of high-capacity batteries because of their high capacity, high discharge platform and excellent safety performance. However, the volume expansion of alloy materials generally exists in the actual application process. Due to the large internal stress released by the alloy materials during charging and discharging, it is easy to make the negative electrode sheet of the battery peel off from the battery, resulting in a significant increase in the internal resistance of the battery; at the same time, A new SEI film (solid electrolyte interface film) is continuously formed on the surface of the exposed alloy material, whic...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M10/0525
CPCY02E60/10
Inventor 王涛
Owner 韩志娟
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