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Man-made graphite cathode material for lithium ion battery and its making method

A technology of artificial graphite negative electrode and lithium-ion battery, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of unusable graphite, poor high-rate discharge performance, and low capacity, and achieve high discharge capacity, simple process, Ease of industrial production

Active Publication Date: 2007-12-12
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the anode materials of commercialized lithium-ion batteries are mainly carbon materials, and mainly petroleum coke and graphite materials. Among them, graphite anode materials with high crystallinity have high charge-discharge capacity and good charge-discharge platform, but their large rate The discharge performance is poor and cannot meet the requirements of power lithium-ion batteries, and high-crystallinity graphite cannot be used in electrolyte systems containing PC solvents, and PC solvents as electrolyte solvents can make batteries have excellent high and low temperature performance And it is widely used in batteries; while artificial graphite anode materials have better rate discharge performance, and can be used in PC electrolyte system, stable cycle, but low capacity

Method used

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  • Man-made graphite cathode material for lithium ion battery and its making method
  • Man-made graphite cathode material for lithium ion battery and its making method
  • Man-made graphite cathode material for lithium ion battery and its making method

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preparation example Construction

[0025] Its preparation method comprises the following steps:

[0026] 1. Coal-based or petroleum-based needle coke is pulverized mechanically and the particle size is in the range of 5-18 μm.

[0027] 2. Preheat the crushed needle coke at 50-160°C for 1-5h, and fill it with nitrogen, argon, helium, neon or carbon dioxide during the preheating process.

[0028] 3. Adding a modifying agent accounting for more than 0-10wt.% of the needle coke, or / and a catalyst accounting for more than 0-10wt.% of the needle coke; the modifying agent is one or more than one type of organic matter that can be carbonized: Furan resin, urea-formaldehyde resin, pyrimidine resin, phenolic resin, epoxy resin, polyvinyl alcohol, polystyrene, polymethyl methacrylate, polytetrafluoroethylene, polyvinylidene fluoride, polyacrylonitrile (PAN), butyl Styrene rubber (SBR), cellulose (CMC), coke, coal tar pitch or petroleum pitch; compounds with phosphorus catalyst: phosphoric acid, P 2 o 5 , boron, boron c...

Embodiment 1

[0038] Example 1: Crushing petroleum-based needle coke to D 50 = about 18 μm, after preheating at 80°C for 2 hours, fully mix with 2.5wt.% boric acid aqueous solution to make a suspension, spray dry and granulate at 180°C, and raise the temperature of the above granules under the protection of nitrogen After reaching 1100°C, keep it warm for 2 hours, and then lower it to room temperature to obtain the artificial graphite negative electrode material, as shown in Figure 1, with an average particle diameter of D 50 18.4μm, specific surface area 2.8m 2 / g, as shown in Figure 2, the crystal layer spacing d 002 0.340nm, as shown in Figure 3, has good charge and discharge performance.

Embodiment 2

[0039] Example 2: Crushing petroleum-based needle coke to D 50 = about 5 μm, after preheating at 120°C for 4 hours, fully mix with 2wt.% Si, spray dry and granulate at 250°C, and graphitize the above particles at 2500°C for 48 hours under the protection of nitrogen , down to room temperature, the obtained artificial graphite negative electrode material is shown in Figure 4, and its average particle size D 50 5.5μm, specific surface area 1.7m 2 / g, as shown in Figure 5, the crystal layer spacing d 002 It is 0.337nm, as shown in Figure 6, which has good charge and discharge performance.

[0040] As shown in Figure 1, the particle shape of the artificial graphite negative electrode material of the present invention undergoes spray-drying granulation, surface coating modification and heat treatment. , its particle shape is irregular block shape, with more fine powder and larger specific surface area; after modification treatment, the particle shape changes to spherical or nearl...

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Abstract

The invention discloses a preparing method of an artificial graphite cathode material used in lithium ion battery; it aims at resolving problems that cathode material possesses higher discharging capacity, coulomb efficiency and long circle life. The preparing method includes following steps: coal or petroleum needle-type coke is comminuted, and hot processed for 1-48 hours at 800deg.C-3000deg.C, comparing with current technique, the cathode material adopts needle-type coke to be comminuted, and hot process, defect that high crystallinity graphite material can not be circled in electrolyte system of PC solvent stably, and it can discharge in big times, it can be used in lithium ion drive battery, and craft is easy, and it fits for industrialization production.

Description

technical field [0001] The invention relates to a lithium-ion battery negative electrode material and a preparation method thereof, in particular to an artificial graphite negative electrode material for a lithium-ion power battery, which requires a higher compaction ratio and is suitable for a PC solvent system, and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a new generation of secondary batteries after nickel-metal hydride batteries since the 1990s. Because of its advantages of high working voltage, high energy density, long cycle life, small self-discharge, and no memory effect, it has become the preferred chemical power source for high-end electronic consumer products, and has penetrated into aerospace, military and other cutting-edge technology fields. With its ever-increasing demand, lithium-ion batteries are becoming the focus and focus of scientific and technological research and development in the new century. At present, ...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01B31/04H01M4/583
CPCY02E60/10
Inventor 岳敏邓明华闫慧青贺雪琴张万红
Owner BTR NEW MATERIAL GRP CO LTD
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