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High-capacity and high-rate lithium battery anode material and preparation method thereof

A negative electrode material and high rate technology, applied in the field of high capacity and high rate lithium battery negative electrode material and its preparation, can solve the problems of high binder content and complex bonding process, achieve good liquid absorption, overcome many equipment, The effect of good industrial application prospects

Inactive Publication Date: 2016-02-24
JIANGSU SAINTY HI TECH & CARBON MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of binder in the present invention is relatively high, and the bonding process is complicated, which limits the greater improvement of cycle performance to a certain extent.

Method used

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  • High-capacity and high-rate lithium battery anode material and preparation method thereof
  • High-capacity and high-rate lithium battery anode material and preparation method thereof
  • High-capacity and high-rate lithium battery anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Select needle coke with D50 of 5 μm, D50 is measured by LS-POP-6 European and American laser particle size analyzer, the asphalt is softened at high temperature, 700g needle coke and 300g asphalt are mixed and stirred evenly in a high-speed mixer, and the stirring speed is 800r / min , the stirring time is 20min, and the stirred mixture is pressed under the pressure of 200MPa in an isostatic press, and the obtained initial compact is fired at 800°C for 15 hours under the protection of a nitrogen atmosphere, and naturally cooled to room temperature after the firing is completed, and then The semi-finished block is crushed and shaped to obtain carbon powder with a D50 of 16.51 μm, and then the carbon powder is graphitized at a high temperature of 3000 ° C, and after natural cooling, iron removal and screening are performed to obtain high-magnification, high-capacity, and high-pressure graphite powder, the resulting graphite powder has no impurities, and the tap density is 1....

Embodiment 2

[0040]Choose needle coke with a D50 of 4 μm. D50 is measured by LS-POP-6 Occidental laser particle size analyzer. The tar is softened at high temperature. Mix 750g of needle coke and 250g of tar in a high-speed mixer and stir evenly at a stirring speed of 500r / min , the stirring time is 30min, and the stirred mixture is pressed under the pressure of 200MPa in an isostatic press, and the obtained initial compact is fired at 1000°C for 10 hours under the protection of a nitrogen atmosphere, and naturally cooled to room temperature after the firing is completed, and then The semi-finished block is crushed and reshaped to obtain carbon powder with a D50 of 17.23 μm, then the carbon powder is graphitized at a high temperature at 2500 ° C, and after natural cooling, iron removal and screening are performed to obtain high-magnification, high-capacity, high-pressure graphite powder, the resulting graphite powder has no impurities, and the tap density is 1.053g / cm 3 , the specific surf...

Embodiment 3

[0043] Select needle coke with a D50 of 6 μm. D50 is measured by LS-POP-6 European and American laser particle size analyzer. The resin is softened at high temperature. Mix 800g needle coke and 200g resin in a high-speed mixer and stir evenly at a stirring speed of 1000r / min , the stirring time is 20min, and the stirred mixture is pressed under the pressure of 100MPa in an isostatic press, and the obtained initial compact is fired at 500°C for 20 hours under the protection of a nitrogen atmosphere, and naturally cooled to room temperature after the firing is completed, and then The semi-finished block is crushed and shaped to obtain carbon powder with a D50 of 14.97 μm, and then the carbon powder is graphitized at a high temperature at 3000 ° C, and after natural cooling, iron removal and screening are performed to obtain high-magnification, high-capacity, and high-pressure graphite powder, the resulting graphite powder has no impurities, and the tap density is 1.107g / cm 3 , t...

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Abstract

The invention discloses a preparation method of a high-capacity and high-rate lithium battery anode material, and is characterized in that the preparation method includes the following steps: stirring needle-coke and a binder in a high-speed stirrer evenly; pressing the mixture after stirring under an ultra-high pressure of an isostatic pressing machine, to obtain an initially-pressed block; heating and sintering the initially-pressed block under a nitrogen atmosphere protection, cooling, and then crushing and shaping the semi-finished block, to obtain a carbon powder; and carrying out high temperature graphitization on the carbon powder, cooling, and then carrying out iron removal screening, to obtain the graphite powder with high rate, high capacity and high compaction. The graphite anode material prepared by the preparation method has the characteristics of high capacity, high rate and good cycling performance.

Description

technical field [0001] The invention relates to a battery material and a preparation method thereof, in particular to a high-capacity high-rate lithium battery negative electrode material and a preparation method thereof. Background technique [0002] Storage battery is a chemical "power source" widely used in the world. At present, storage batteries mainly include nickel-cadmium batteries, nickel metal hydride batteries, nickel-zinc batteries, lead-acid batteries, lithium batteries, etc. Among them, the lithium battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. It was first proposed and studied by GilbertN.Lewis in 1912. With the continuous development and progress of the society and the improvement of the quality of human life, digital products have been popularized. Lithium batteries, as an important power source for digital products and high-end instrument products, have g...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/1393H01M10/052
CPCH01M4/043H01M4/1393H01M10/052Y02E60/10
Inventor 王宏章徐世海张小翼
Owner JIANGSU SAINTY HI TECH & CARBON MATERIALS
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