Silicon-carbon composite negative pole material, preparation method thereof and lithium ion battery using foamed metal as negative pole current collector

A technology for lithium ion batteries and negative electrode materials, applied in the field of lithium ion batteries, can solve the problems of low capacity of composite materials, and achieve the effects of high specific surface area, simple operation, and improved adhesion strength

Inactive Publication Date: 2012-09-26
DONGGUAN MCNAIR NEW POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material has an initial reversible capacity of 612mAh / g, and the retention rate after 40 cycles is 74.5%, while the capacity retention rate of the sample without adding copper is only 14.1% after 25 cycles; the addition of copper not only improves the cycle stability , and significantly improved the high-current charge-discharge performance of the material, because the presence of copper improved the dispersion and electronic conductivity of silicon, but Cu 5 Si inert phase leads to lower capacity of the whole composite (Nuli Y, Wang B, Yang J, Yuan X, Ma Z.J. Power Sources, 2006, 153 (2): 371-374)

Method used

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  • Silicon-carbon composite negative pole material, preparation method thereof and lithium ion battery using foamed metal as negative pole current collector
  • Silicon-carbon composite negative pole material, preparation method thereof and lithium ion battery using foamed metal as negative pole current collector
  • Silicon-carbon composite negative pole material, preparation method thereof and lithium ion battery using foamed metal as negative pole current collector

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Experimental program
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Embodiment 1

[0034] The SiMg / C composite anode material was prepared by using nickel foam as the anode current collector. Dissolve sucrose in ethyl acetate and mix slowly; then slowly add silicon powder with a particle size of about 200nm and ethylmagnesium bromide according to the metering ratio, shake gently and heat properly; place the agglomerated mixture in Remove the organic solvent in an oven at a temperature of 80°C; the dried mixture is transferred into a 2 Heating in a tubular electric furnace, slowly raising the temperature to about 1000°C, the heating rate is 15°C / min, and the reaction time is 2h; then the reacted mixture is ground in a mortar; the prepared silicon-carbon composite negative electrode material, conductive carbon Black and binder PVDF are mixed according to the mass ratio of 85:10:5. At the same time, an appropriate amount of N-methylpyrrolidone (NMP) is added and stirred evenly. Bake under vacuum for 12h. After taking out the negative pole piece, assemble it w...

Embodiment 2

[0036] The Si / C composite anode material was prepared by using nickel foam as the anode current collector. Dissolve sucrose in ethyl acetate, mix slowly and evenly; then slowly add silicon powder with a particle size of about 200nm, shake gently and heat properly; place the mixture in an oven to remove the organic solvent at 80°C; dry After the mixture was moved into a bubble with Ar or N 2 Heating in a tubular electric furnace, slowly raising the temperature to about 1000°C, the heating rate is 15°C / min, and the reaction time is 2h; then the reacted mixture is ground in a mortar; the prepared silicon-carbon composite negative electrode material, conductive carbon Black and binder PVDF are mixed according to the mass ratio of 85:10:5. At the same time, an appropriate amount of N-methylpyrrolidone is added and stirred evenly, and then made into a sheet, which is pressed with foamed nickel to form a negative electrode sheet, and then baked under vacuum Dry for 12 hours. The te...

Embodiment 3

[0038] The SiMg / C composite anode material was prepared by using copper foil as the anode current collector. Dissolve sucrose in ethyl acetate and mix slowly; then slowly add silicon powder with a particle size of about 200nm and ethylmagnesium bromide according to the metering ratio, shake gently and heat properly; place the agglomerated mixture in Remove the organic solvent in an oven at a temperature of 80°C; the dried mixture is transferred into a 2 Heating in a tubular electric furnace, slowly raising the temperature to about 1000°C, the heating rate is 15°C / min, and the reaction time is 2h; then the reacted mixture is ground in a mortar; the prepared silicon-carbon composite negative electrode material, conductive carbon Black and binder PVDF are mixed according to the mass ratio of 85:10:5, and an appropriate amount of N-methylpyrrolidone is added at the same time, after stirring evenly, it is coated on the copper foil of the negative electrode current collector, and th...

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Abstract

The invention discloses a silicon-carbon composite negative pole material, a preparation method thereof and a lithium ion battery using foamed metal as a negative pole current collector, belonging to the field of the lithium ion battery. The lithium ion battery using foamed metal as a negative pole current collector comprises foamed metal used as the negative pole current collector and the silicon-carbon composite negative pole material; the three-dimensional pore conduction network structure and the high porosity of the foamed metal are beneficial to the contact between silicon active substances and the current collector, and the foamed metal has high adhesion strength, so that the great volume effect of the silicon active substances can be well relieved, and the silicon active substances are not prone to fall in the charging/discharging process, thereby effectively promoting the cycling stability of the silicon-carbon composite negative pole material; the silicon-carbon composite negative pole material of which the general formula is Si-C-X has a disperse carrier and a high-capacity lithium-storing material containing the silicon active substances; and the disperse carrier is a carbon material having stable lithium-storing capacity and reversible lithium intercalation/deintercalation performance, thereby obviously improving the capacity and the rate discharging performance of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a silicon-carbon composite negative electrode material, a preparation method thereof, and a lithium ion battery using foamed metal as a negative electrode current collector. Background technique [0002] With the rapid development of various portable electronic devices and electric vehicles, the demand and performance requirements for chemical power sources have increased sharply. The power battery technology represented by lithium-ion batteries has attracted the attention of researchers from governments, enterprises, universities and other institutions. [0003] At present, many people try to improve battery performance by improving the active materials of battery electrode materials. A large number of studies have shown that it is difficult to achieve breakthroughs purely by improving electrode materials. If it can cooperate with the improvement of the electrode current col...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/66
CPCY02E60/12Y02E60/10
Inventor 李新喜张国庆张新河熊中琼阳楚雄李中延
Owner DONGGUAN MCNAIR NEW POWER
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