Silicon-containing negative electrode of lithium ion battery and preparation method of silicon-containing negative electrode

A technology for lithium-ion batteries and silicon negative electrodes, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of low initial charge and discharge efficiency, and achieve the effects of low cost, simple preparation method, and high yield

Active Publication Date: 2014-05-07
安普瑞斯(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the physical and chemical characteristics of the silicon material itself, there are also some problems when it is used as the anode material of lithium-ion batteries: first, the first charge and discharge efficiency of silicon is low, usually 60-70%; Intercalation and extraction of more lithium ions is accompanied by greater volume expansion and contraction (up to 300%), and the constant volume change has a certain impact on the stability of the battery's cycle performance
The above problems have always limited the use of pure silicon materials in lithium-ion battery anode materials

Method used

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  • Silicon-containing negative electrode of lithium ion battery and preparation method of silicon-containing negative electrode
  • Silicon-containing negative electrode of lithium ion battery and preparation method of silicon-containing negative electrode
  • Silicon-containing negative electrode of lithium ion battery and preparation method of silicon-containing negative electrode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weigh 38.2g of natural graphite (average particle size D50=25.2μm) and 1.0g polycrystalline silicon nanoparticles (average particle size D50=0.26μm) into a certain amount of beaker, and slowly mechanically stir for 10 minutes to mix the two powders evenly; Add 40g of carboxymethyl cellulose aqueous dispersion with a concentration of 1.0%, completely wet the surface of the powder particles with a glass rod, and then turn on high-speed mechanical stirring (>1000 rpm); add 0.8g of 50% carboxymethyl cellulose after 30 minutes For the aqueous dispersion of styrene-butadiene rubber, continue high-speed mechanical stirring (>1000 rpm), stop after 10 minutes, and obtain gray-black viscous slurry. After coating the gray-black viscous slurry, dry it at 80°C, and roll it with a double-roller machine to make the compacted density of the overall pole piece reach 1.60-1.75g / cm 3 , that is, the final usable pole piece is obtained.

[0041] Scanning electron microscope test: After vac...

Embodiment 2

[0047] Weigh 37.2g of artificial graphite (average particle size D50=22.6μm) and 2.0g polycrystalline silicon nanoparticles (average particle size D50=0.26μm) into a certain amount of beaker, and slowly mechanically stir for 10 minutes to mix the two powders evenly; Add 40g of carboxymethyl cellulose aqueous dispersion with a concentration of 1.0%, completely wet the surface of the powder particles with a glass rod, and then turn on high-speed mechanical stirring (>1000 rpm); add 0.8g of 50% carboxymethyl cellulose after 30 minutes For the aqueous dispersion of styrene-butadiene rubber, continue high-speed mechanical stirring (>1000 rpm), stop after 10 minutes, and obtain gray-black viscous slurry. After coating the gray-black viscous slurry, dry it at 80°C, and roll it with a double-roller machine to make the compacted density of the overall pole piece reach 1.60-1.75g / cm 3 , that is, the final usable pole piece is obtained.

[0048] Electrical performance test results: the ...

Embodiment 3

[0051] Weigh 39.2g surface-modified natural graphite (average particle diameter D50=24.4μm) and 0.2g polysilicon nano-particles (average particle diameter D50=0.26μm) into a certain amount of beaker, and slowly mechanically stir for 10 minutes to make the two Mix the powder evenly; add 40g of carboxymethyl cellulose aqueous dispersion with a concentration of 1.0%, completely wet the surface of the powder particles with a glass rod, and then turn on high-speed mechanical stirring (>1000 rpm); add 0.8g concentration after 30 minutes For 50% styrene-butadiene rubber aqueous dispersion, continue high-speed mechanical stirring (>1000 rpm), stop after 10 minutes, and obtain gray-black viscous slurry. After coating the gray-black viscous slurry, dry it at 80°C, and roll it with a double-roller machine to make the compacted density of the overall pole piece reach 1.60-1.75g / cm 3 , that is, the final usable pole piece is obtained.

[0052] Electrical performance test results: such as ...

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Abstract

The invention discloses a silicon-containing negative electrode of a lithium ion battery. The negative electrode contains an active material, a thickening agent and a binder, wherein the active material is a mixture formed by carbon-based powder and silicon-containing powder, the carbon-based powder accounts for 93wt%-98wt% of the total weight of the silicon-containing negative electrode, the silicon-containing powder accounts for 0wt%-5wt% (except 0%) of the total weight of the silicon-containing negative electrode; the ratio of the average particle size D50 of the carbon-containing powder to the average particle size D50 of the silicon-containing powder is within 3.0-96.9. Meanwhile, the invention discloses a preparation method of the silicon-containing negative electrode, the negative electrode has the characteristics of high volume, high efficiency, small expansion rate and good cycle performance, low material cost, simple steps and good repeatability, and scale production of the silicon-containing negative electrode in the lithium ion battery field is realized.

Description

technical field [0001] The invention relates to a battery negative electrode and a preparation method thereof, in particular to a silicon-containing negative electrode of a lithium ion battery, a preparation method thereof and a lithium ion secondary battery using the silicon negative electrode. Background technique [0002] Since Sony invented the lithium-ion battery-based mobile phone in 1991, lithium-ion batteries have played a very important role in the development of the entire human society. Today, new electronic products such as smartphones, tablets, Bluetooth headsets, and smart watches based on lithium-ion batteries continue to affect people's daily lives. Lithium-ion batteries are composed of positive electrode materials, negative electrode materials, separators, electrolytes, current collectors, tabs, and casings. The part that mainly affects the battery capacity and energy is the positive and negative electrode materials of the battery. With the continuous upgr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/36H01M4/62
CPCH01M4/133H01M4/134H01M4/1393H01M4/1395Y02E60/10
Inventor 王岑徐子福韩松潘丽群汪芳刘祖琴周萨赵阳雨
Owner 安普瑞斯(无锡)有限公司
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