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Lithium-ion battery negative electrode material and preparation method thereof, 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 affecting the electrochemical performance of negative electrode materials, battery cycle performance degradation, conductive network damage resistance, etc., to improve reversible capacity, The effect of improving the discharge capacity and reducing the dosage

Active Publication Date: 2011-12-28
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing carbon coating method can improve the electrochemical performance of the material to a certain extent, the coating layer is thick and the wettability of the electrolyte is poor, which affects the further improvement of the electrochemical performance of the negative electrode material.
When making electrode sheets, a conductive agent needs to be added, and the volume of the electrode material changes during the cycle of lithium intercalation and desorption, resulting in poor contact between the electrode material particles and the current collector after the charge-discharge cycle, forming an "island". "effect, leading to the destruction of the conductive network between the electrode material, the conductive agent carbon black and the current collector and the increase in resistance, and the cycle performance of the battery is reduced

Method used

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  • Lithium-ion battery negative electrode material and preparation method thereof, lithium-ion battery
  • Lithium-ion battery negative electrode material and preparation method thereof, lithium-ion battery
  • Lithium-ion battery negative electrode material and preparation method thereof, lithium-ion battery

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preparation example Construction

[0034] The preparation method one of lithium ion battery negative electrode material of the present invention comprises the following steps:

[0035] 1. Mixing, adding a catalyst to the graphite matrix material, the mass of the catalyst is greater than 0 to 5% of the mass of the graphite matrix, and the addition method is solid phase mixing or liquid phase mixing to obtain a mixture. As a carbon source, the catalyst decomposes the active center and the graphite carbon deposition center, and plays a vital role in the morphology and structure of the network carbon nanotubes and / or carbon fibers formed on the surface of the graphite matrix by the cracking products of carbon on the surface of the graphite matrix material. A good catalyst and other conditions of the present invention can form networked carbon nanotubes and carbon fiber structures.

[0036] The graphite matrix is ​​more than one of natural flake graphite, microcrystalline graphite, artificial graphite, carbon micros...

Embodiment 1

[0079] Embodiment 1: the particle size D 50 Spherical natural graphite with a size of 3 to 40 μm and a carbon content of 85% was put into a VC-500 mixer, and 5% of the catalyst Fe(NO 3 ) 3 Solid-phase mixing, rotating speed is 500r / min, mixing time is 180min, obtains mixture; Put mixture in the furnace cavity of rotary furnace, the volume of mixture is 10% of furnace capacity, with 10m 3 The flow rate of / h is fed into nitrogen, the temperature is raised to 1300°C at a speed of 0.1°C / min, and the furnace chamber is rotated at a speed of 20rpm, and kept for 0.5h; 3The carbon source gas methane is fed at a flow rate of / h, and the carbon source gas is stopped after 0.1h (keep 0h under the condition of 1300°C); the temperature is lowered by passing cooling water between the furnace wall and the heat conduction layer in the furnace wall way to below 100°C; continue at 10m 3 The flow rate of / h is passed into nitrogen protection, the temperature is raised to 300°C at a speed of ...

Embodiment 2

[0080] Embodiment 2, the particle size D 50 Spherical natural graphite with a size of 3 to 40 μm and a carbon content of 85% was put into a VC-500 mixer, and 3% of the catalyst Fe(NO 3 ) 3 Solid-phase mixing, the rotating speed is 5000r / min, and the mixing time is 5min to obtain the mixture; the mixture is put into the furnace cavity of the rotary furnace, and the volume of the mixture is 50% of the furnace capacity, and the volume of the mixture is 0.05m 3 The flow rate of / h is fed into nitrogen, and the temperature is raised to 300°C at a rate of 50°C / min, and the furnace chamber is not rotated for 0.1h; 3 The carbon source gas methane is fed at a flow rate of / h, and the carbon source gas is stopped after being kept for 5 hours, and kept at 300°C for 6 hours; naturally cooled to room temperature; 3 The flow rate of / h is fed into nitrogen protection, and the temperature is raised to 3000°C at a rate of 50°C / min and kept for 0.5h. into nitrogen; the material moisture con...

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Abstract

The invention discloses a lithium ion battery cathode material, and a preparation method and a lithium ion battery thereof. The technical problem to be solved is to increase the discharge capacity, the multiplying power, the liquid absorption and the circulation performance of the lithium ion battery. The cathode material disclosed by the invention is a composite material which is composed of a graphite substrate, a mesh carbon nano-tube and / or nano-carbon fibre growing in situ of the graphite substrate, and / or the mesh carbon nano-tube and / or the nano-carbon fibre mixed in the graphite substrate, and a nano columnar structure. The preparation method disclosed by the invention comprises the following steps of: adding a catalyst into the graphite substrate material; putting in a furnace chamber; and introducing carbon source gas at 300-1300 DEG C. Compared with the prior art, the cathode material disclosed by the invention has the advantages of simplicity in process, precision for control and easiness for reproduction; the specific surface area of the cathode material is increased; the conductivity is increased; the discharge capacity is increased by 10-30 mAh / g; the ratio of 10C / 1C is more than or equal to 94%; the battery is manufactured from the material in the invention; the use amount of a conductive agent can be reduced; and the cost of the lithium ion battery can be reduced.

Description

technical field [0001] The invention relates to a battery negative electrode material and a preparation method thereof, and a battery using the negative electrode material, in particular to a lithium ion battery composite carbon negative electrode material and a preparation method thereof, and a lithium ion battery using the negative electrode material. Background technique [0002] With the miniaturization of various portable electronic devices and the rapid development of electric vehicles, people have put forward higher performance requirements for lithium-ion batteries as chemical power sources. The improvement of the performance of lithium-ion batteries mainly depends on the improvement of the electrochemical performance of the electrode materials. By modifying the electrode material, its electrochemical performance can be improved. Commonly used modification methods include surface coating to construct core-shell structure, doping modification and surface oxidation. ...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/133H01M4/1393H01M10/0525
CPCH01M4/587H01M10/0525Y02E60/122H01M4/1393H01M4/133H01M4/38Y02E60/12Y02E60/10H01M4/583
Inventor 岳敏闫慧青邓明华黄友元
Owner BTR NEW MATERIAL GRP CO LTD
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