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Graphite composite negative electrode material for lithium ion battery, preparation method of material, and lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficulty in controlling the uniformity and thickness of the coating layer, affecting the electrical conductivity of raw materials, and reducing the wettability of electrolytes. Improve liquid retention performance, increase specific surface area, and improve the effect of electrical conductivity

Active Publication Date: 2013-08-14
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the uniformity and thickness of the cladding layer are difficult to control; the existence of the cladding layer will affect the electrical conductivity of the raw material; the cladding layer has strong hardness and poor elasticity, and it is easy to charge and discharge when the core orientation is consistent. The rupture of the shell leads to the proliferation of the SEI film and the increase of the impedance; the coating layer also reduces the wettability of the electrolyte

Method used

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  • Graphite composite negative electrode material for lithium ion battery, preparation method of material, and lithium ion battery
  • Graphite composite negative electrode material for lithium ion battery, preparation method of material, and lithium ion battery
  • Graphite composite negative electrode material for lithium ion battery, preparation method of material, and lithium ion battery

Examples

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Effect test

Embodiment 1

[0050] Fully dissolve ferric nitrate in water to prepare a solution with iron ion concentration of 0.001mol / L, then add 99.90% pure flake graphite and stir well, soak for 24h, filter out the solution, and then dry at 99℃ to obtain graphite Composite material precursor: Put the above graphite composite material precursor into a rotary kiln, in a helium atmosphere with a flow rate of 0.1L / min and at 400°C, acetylene is introduced at a flow rate of 10L / min for chemical vapor deposition, and the reaction lasts for 0.1 h, to generate carbon nanotubes and / or carbon nanofibers; calcining the product obtained by the above chemical vapor deposition in a vacuum and 2000 ℃ for 10h; placing the product obtained by the above calcination in a box-type resistance furnace, in an oxygen atmosphere and 300 It was calcined at a constant temperature for 5 hours at ℃ and then naturally cooled to room temperature to obtain a graphite composite anode material.

Embodiment 2

[0052] Fully dissolve nickel chloride in water to make a solution with a nickel ion concentration of 0.01 mol / L, then add microcrystalline graphite with a purity of 95.00% and stir well, soak for 15 hours, filter out the solution, and then dry at 90°C. The graphite composite material precursor is obtained; the above graphite composite material precursor is put into a tube furnace, and methane is fed into the tube furnace at a flow rate of 0.5L / min in a neon atmosphere and at a flow rate of 5L / min for chemical vapor deposition. The reaction lasts for 1 hour to generate carbon nanotubes and / or carbon nanofibers; the product obtained by chemical vapor deposition is immersed in a strong mixed acid of nitric acid, hydrochloric acid and sulfuric acid for 0.5 hours, then washed with water, dehydrated, and dried; The purified product is placed in a tubular sintering furnace, calcined at a constant temperature of 400° C. for 1 h in an air atmosphere, and then naturally cooled to room tem...

Embodiment 3

[0054] Fully dissolve cobalt sulfate in water to prepare a solution with a cobalt ion concentration of 0.1 mol / L, then add a needle coke graphitized product with a purity of 99.00% and stir well, soak for 10 hours, filter out the solution, and then bake at 80°C Dry to obtain a graphite composite material precursor; put the above graphite composite material precursor into a box furnace, and pass ethylene at a flow rate of 1L / min under an argon atmosphere at a flow rate of 1L / min and at 800°C for chemical vapor deposition , The reaction lasts for 2 hours to generate carbon nanotubes and / or carbon nanofibers; the product obtained by chemical vapor deposition is calcined under nitrogen and 2500°C for 5 hours; the product obtained by the above calcination is placed in a high-temperature microwave ashing furnace, It was calcined in an oxygen atmosphere at a constant temperature of 500° C. for 0.5 h, and then naturally cooled to room temperature to obtain a graphite composite anode mat...

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Abstract

The invention discloses a graphite composite negative electrode material for a lithium ion battery, a preparation method of the material, and the lithium ion battery. The graphite composite negative electrode material for the lithium ion battery has a core-shell structure, wherein graphite is used as an inner core; carbon nano tubes and / or carbon nanofibers which are uniformly distributed on the surface of the graphite and are in in-situ growth are used as the shell; the growth root points of the carbon nano tubes and / or the carbon nanofibers are in tight contact with the surface of the graphite; and the other ends of the carbon nano tubes and / or the carbon nanofibers are distributed on the surface of the graphite randomly. The preparation method comprises the following steps of: fully soaking the graphite as a raw material by a catalyst-containing solution, and drying to obtain a graphite composite material precursor; performing chemical vapor deposition to generate the carbon nano tubes and / or the carbon nanofibers; and finally performing the purification and annealing treatment. The graphite composite negative electrode material has high height ratio, conductivity, and rate capability, and excellent solution absorption performance and cycle performance; and the method is simple in production flow, accurate in process control, low in cost, free from severe conditions, and easy to realize the industrialization.

Description

Technical field [0001] The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a graphite composite negative electrode material for lithium ion batteries, a preparation method and a lithium ion battery. Background technique [0002] As a mature electrochemical power system, lithium-ion batteries have been used in all aspects of people's daily life, but these applications are still difficult to meet the requirements of higher performance. Currently, the cathode materials for lithium-ion batteries that are widely used and have better comprehensive performance are graphite materials. They have a good layered structure, a stable discharge platform, small volume changes during the process of lithium extraction, good electrical conductivity and No voltage hysteresis. But from another point of view, graphite with better crystallinity results in an upper limit of specific capacity, which is difficult to break through, poor compa...

Claims

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Application Information

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IPC IPC(8): C01B31/04H01M10/0525H01M4/587
CPCY02E60/122Y02E60/10
Inventor 岳敏李子坤刘福静黄友元任建国
Owner BTR NEW MATERIAL GRP CO LTD
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