Composite negative electrode material for lithium batteries and preparation method thereof

A negative electrode material, lithium battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of unsatisfactory high-current discharge performance, poor high-rate charge-discharge performance, specific capacity decay, etc., to achieve cycle performance and improve Conductivity, volume reduction effect

Active Publication Date: 2018-10-19
黑龙江海达新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, lithium titanate is mostly used as the negative electrode material of lithium batteries in the market, but the intrinsic conductivity of lithium carbonate is low, only 10 -9 S / cm, belonging to an insulator, has poor conductivity, resulting in poor performance during high-rate charge and discharge and rapid specific capacity decay, and unsatisfactory high-current discharge performance

Method used

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  • Composite negative electrode material for lithium batteries and preparation method thereof
  • Composite negative electrode material for lithium batteries and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Manganese carbonate, lithium titanate, and cobalt oxide are mixed uniformly according to the molar ratio of elements Mn:Li:Co=1.6:0.621:0.2, put into a stirring ball mill for mechanical activation, and pass through a 300-mesh sieve after drying;

[0019] 2) In terms of parts by mass, 20 parts of nano-silicon, 80 parts of amorphous carbon, and 200 parts of N-methylpyrrolidone were dispersed by ultrasonic wave for 20 minutes and stirred evenly, and the product sieved in step 1) was mixed with the nano-silicon solution Evenly, place it in a roller furnace for calcination under the protection of nitrogen for 4 hours, the calcination temperature is 600°C, and cool down naturally;

[0020] 3) Put the naturally cooled powder into a ball mill for ball milling. After the ball milling is completed, place it in a roller furnace again, and calcinate for 2 hours under the protection of nitrogen at a calcining temperature of 1000°C. Cool naturally, demagnetize and sieve to obtain t...

Embodiment 2

[0023] 1) Manganese carbonate, lithium titanate, and cobalt oxide are mixed uniformly according to the molar ratio of elements Mn:Li:Co=1.6:0.621:0.2, put into a stirring ball mill for mechanical activation, and pass through a 300-mesh sieve after drying;

[0024] 2) In terms of parts by mass, 30 parts of nano-silicon, 90 parts of amorphous carbon, and 210 parts of N-methylpyrrolidone were dispersed by ultrasonic wave for 20 minutes and stirred evenly, and the product sieved in step 1) was mixed with the nano-silicon solution Evenly, place it in a roller furnace for calcination under the protection of nitrogen for 5 hours, the calcination temperature is 650°C, and cool down naturally;

[0025] 3) The naturally cooled powder was put into a ball mill for ball milling. After the ball milling was completed, it was placed in a roller furnace again, and calcined for 3 hours under the protection of nitrogen. The calcining temperature was 1250° C., cooled naturally, and the negative el...

Embodiment 3

[0028] 1) Manganese carbonate, lithium titanate, and cobalt oxide are mixed uniformly according to the molar ratio of elements Mn:Li:Co=1.6:0.621:0.2, put into a stirring ball mill for mechanical activation, and pass through a 300-mesh sieve after drying;

[0029] 2) In terms of parts by mass, 40 parts of nano-silicon, 100 parts of amorphous carbon, and 220 parts of N-methylpyrrolidone were dispersed by ultrasonic wave for 20 minutes and stirred evenly, and the product sieved in step 1) was mixed with the nano-silicon solution Evenly, place it in a roller furnace for calcination for 6 hours under the protection of nitrogen, and the calcination temperature is 700 ° C, and the temperature is naturally lowered;

[0030] 3) Put the naturally cooled powder into a ball mill for ball milling. After the ball milling is completed, place it in a roller furnace again and calcinate for 4 hours under the protection of nitrogen. The calcining temperature is 1300°C. Cool naturally, demagnetiz...

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Abstract

The invention discloses a composite negative electrode material for lithium batteries. The composite negative electrode material is prepared from composite microspheres with internal void structures,wherein the composite microspheres are prepared from lithium titanate and nano-silicon; the particle size of the nano-silicon is 40 to 60nm. The invention further discloses a preparation method of thecomposite negative electrode material for te lithium batteries. By adopting the composite negative electrode material, the conductivity is enhanced effectively. The composite negative electrode material is especially suitable for large household appliances with higher utilization rate.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a composite negative electrode material for lithium batteries and a preparation method thereof. Background technique [0002] Lithium battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. In 1912, the lithium metal battery was first proposed and studied by Gilbert N. Lewis. In the 1970s, M.S.Whittingham proposed and began to study lithium-ion batteries. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. Therefore, lithium batteries have not been used for a long time. With the development of science and technology, lithium batteries have become the mainstream now. [0003] At present, lithium titanate is mostly used as the negative electrode material of lithium batteries in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525
CPCH01M4/364H01M4/485H01M4/505H01M4/525Y02E60/10
Inventor 丘焕山
Owner 黑龙江海达新材料科技有限公司
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