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

A lithium-ion battery and negative electrode material technology, 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 conductivity of raw materials, and reducing the wettability of electrolyte, etc., to achieve Improve liquid retention performance, increase specific surface area, and improve electrical conductivity

Active Publication Date: 2016-01-06
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 and lithium ion battery
  • Graphite composite negative electrode material for lithium ion battery, preparation method and lithium ion battery
  • Graphite composite negative electrode material for lithium ion battery, preparation method and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Fully dissolve ferric nitrate in water to make a solution with an iron ion concentration of 0.001mol / L, then add flake graphite with a purity of 99.90% and stir well, soak for 24 hours, filter out the solution, and then dry at 99°C to obtain graphite Composite material precursor: Put the above-mentioned graphite composite material precursor into a rotary furnace, in a helium atmosphere with a flow rate of 0.1L / min and at 400°C, pass acetylene 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; the product obtained by the above chemical vapor deposition was calcined in vacuum at 2000° C. for 10 h; ℃ for 5 h at a constant temperature, and then naturally cooled to room temperature to obtain a graphite composite negative electrode material.

Embodiment 2

[0052] Fully dissolve nickel chloride in water to form a solution with a nickel ion concentration of 0.01mol / L, then add microcrystalline graphite with a purity of 95.00% and stir thoroughly, soak for 15 hours, filter out the solution, and then dry at 90°C. Obtain the precursor of graphite composite material; put the above precursor of graphite composite material into the tube furnace, in the neon gas atmosphere with the flow rate of 0.5L / min and at 600°C, feed methane with the 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 the above chemical vapor deposition is soaked in a mixed strong acid of nitric acid, hydrochloric acid and sulfuric acid for 0.5 hours, then washed with water, dehydrated, and dried; the above acid The purified product was placed in a tubular sintering furnace, calcined at a constant temperature of 400° C. for 1 h in an air atmosphere, and then na...

Embodiment 3

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

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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 negative electrode materials for lithium ion batteries, 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 various aspects of people's daily life, but these applications are still difficult to meet the requirements of higher performance. At present, the lithium-ion battery anode materials with wide application and better comprehensive performance are graphite materials, which have good layered structure, stable discharge platform, small volume change in the process of lithium deintercalation, good conductivity and No voltage hysteresis. But from another point of view, graphite with better crystallinity leads to an upper limit of specific capacity, which is difficult to break through, poor compatibility wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587C01B31/04H01M10/0525
CPCY02E60/10
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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