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Preparation method of anode material for power 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 low cycle life, poor discharge rate performance of negative electrode materials, etc., and achieve good adhesion, high capacity and charge and discharge Efficiency, good structural stability effect

Inactive Publication Date: 2015-05-27
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above technologies still cannot completely solve two problems: 1. The negative electrode material has poor discharge rate performance; 2. The existing negative electrode material has low cycle life

Method used

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  • Preparation method of anode material for power lithium ion battery
  • Preparation method of anode material for power lithium ion battery
  • Preparation method of anode material for power lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take 100KG needle coke as raw material, after crushing and processing, process it to 6μm, put it into the reaction kettle for high temperature carbonization coating treatment, the heating curve is normal temperature -200°C for 30 minutes, 200°C-600°C for 60 minutes, 600°C-1000°C 90 minutes at 1000°C constant temperature for 6 hours, and then ultra-high temperature graphitization treatment above 3200°C. After graphitization, the obtained material is added with 10KG of petroleum pitch, and then enters the carbonization furnace for secondary coating. The coating temperature control curve is normal temperature -350 ℃ for 60 minutes, 350℃-600℃ for 150 minutes, 600℃-1200℃ for 150 minutes, and 1200℃ for 1 hour to obtain a spherical artificial graphite material coated and bonded by small particles. The D50 is 13.2μm, which is extremely Tablet compaction density 1.62g / cm3, specific surface area 1.55m2 / g, first discharge capacity 352mAh / g, first discharge efficiency 94.3%, rate pe...

Embodiment 2

[0032] Take 100KG needle coke as raw material, grind it to 6μm, add 1KG H 3 BO 3Mix and add to the reaction kettle for high-temperature carbonization coating treatment. The temperature rise curve is -200°C for 30 minutes, 200°C-600°C for 60 minutes, 600°C-1000°C for 90 minutes, 1000°C for 6 hours, and then 3200°C or more. Ultra-high temperature graphitization treatment, the material obtained after graphitization is added with 10KG of petroleum pitch, and then enters the carbonization furnace for secondary coating. The coating temperature control curve is normal temperature -350°C for 60 minutes, 350°C-600°C, 600°C -1200°C for 150 minutes, constant temperature at 1200°C for 1 hour; obtain a spherical artificial graphite material coated and bonded by small particles, with a D50 of 13.5μm, a pole piece compacted density of 1.65g / cm3, and a specific surface area of ​​1.53m2 / g, the first discharge capacity is 363mAh / g, the first discharge efficiency is 94.1%, the rate performance...

Embodiment 3

[0034] Take 100KG of petroleum coke as raw material, after crushing and processing, process it to 4μm, put it into the reaction kettle for high-temperature carbonization coating treatment, the heating curve is -200°C for 30 minutes, 200°C-600°C for 60 minutes, 600°C-1000°C for 90 minutes Minute 1000 ℃ constant temperature for 6 hours, and then carry out ultra-high temperature graphitization treatment above 3200 ℃. After graphitization, the obtained material is added with 15KG of petroleum pitch, and then enters the carbonization furnace for secondary coating. The coating temperature control curve is normal temperature -350 ℃ After 60 minutes, 350°C-600°C, 600°C-1200°C for 150 minutes, 1200°C constant temperature for 1 hour; a spherical artificial graphite material made of small particles coated and bonded, the D50 of the finished product is 12.3μm, Electrode compaction density 1.58g / cm3, specific surface area 1.75m2 / g, initial discharge capacity 350mAh / g, initial discharge effi...

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Abstract

The invention discloses a preparation method of an anode material for a power lithium ion battery. The preparation method comprises the following steps: by adopting petroleum coke ground until the grain size is 1-6mu m, calcined petroleum coke or needle coke as a raw material, adding additives, adding a mixture to a reaction kettle to carry out first high-temperature carbonization coating under the protection of the inert atmosphere, then grinding the mixture with a grinder until the grain size is 5-13mu m, then carrying out superhigh-temperature graphitization at a temperature above 3200 DEG C, adding one or a mixture of petroleum asphalt, coal asphalt and resin to a material obtained after graphitization, and then enabling the mixture to enter a carburization furnace to undergo second coating under the protection of the inert atmosphere to obtain the anode material for the power lithium ion battery, namely a spheroidal artificial graphite material which is formed through bonding after being coated with granules and undergoes two-time coating and three-time high-temperature treatment. The preparation method has the advantages that the discharge rate property of the anode material is improved, the low temperature properties of the anode material are improved, and the latest requirements of the market for the product are further met.

Description

technical field [0001] The invention relates to the field of preparation of negative electrode materials for lithium batteries, in particular to a method for preparing porous negative electrode materials for lithium ion batteries. Background technique [0002] With the frequent shortage of non-renewable energy sources such as coal, oil, and natural gas, the energy problem is a serious problem faced by mankind in the 21st century, and the development of new energy and renewable clean energy is of paramount importance. Compared with traditional secondary batteries, lithium-ion batteries have outstanding advantages such as high working voltage, large specific energy, stable discharge voltage, long cycle life, and no environmental pollution. They have been widely used in mobile phones, notebook computers, and portable measuring instruments. and other small and lightweight electronic devices. At the same time, it is also the preferred power source for future hybrid vehicles and ...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/62
CPCH01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 晏荦
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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