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Carbon negative electrode material for lithium-ion battery and preparation method thereof

A carbon negative electrode material and lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of unsatisfactory reversible capacity and poor electrochemical performance, and achieve excellent rate performance and high capacity.

Active Publication Date: 2018-03-13
HUZHOU CHUANGYA POWER BATTERY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the various negative electrode materials, graphite is the most widely used, but its theoretical capacity is only 372mAh / g, and the actual obtained capacity is often less than 360mAh / g. This reversible capacity is not satisfactory.
Since the selected polymer precursors have no pore structure, the resulting carbon materials have less pore structure and exhibit poor electrochemical performance.

Method used

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  • Carbon negative electrode material for lithium-ion battery and preparation method thereof
  • Carbon negative electrode material for lithium-ion battery and preparation method thereof
  • Carbon negative electrode material for lithium-ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Dissolve 20g of sucrose and 28.86g of ferric nitrate nonahydrate in 15g of deionized water at room temperature, and magnetically stir to fully dissolve and mix;

[0031] (2) Put the obtained solution in a blast drying oven at 100ºC and keep it warm for 12 hours to completely evaporate the water;

[0032] (3) Grind the material after dehydration in step 2 and place it in a muffle furnace, heat it to 200ºC at a heating rate of 0.5ºC / min and keep it warm for 2 hours, then naturally drop to room temperature;

[0033] (4) The loose coke-like substance obtained in step 3 is ground in a mortar, and the ground powder is placed in a quartz boat to be carbonized;

[0034] ⑸Put the quartz boat in the tube furnace, pass in argon gas, the air flow rate is 0.3L / min, and start heating after half an hour. The heating conditions are: 5ºC / min to 300ºC, keep warm for 2h, 5ºC / min to 500ºC , hold for 5 hours, then raise the temperature to 1000°C at 5°C / min, hold for 5h, then cool down ...

Embodiment 2

[0041] (1) Dissolve 20g of sucrose and 20.0g of nickel nitrate hexahydrate in 15g of deionized water at room temperature, and magnetically stir to fully dissolve and mix;

[0042] (2) Put the obtained solution in a blast drying oven at 100ºC and keep it warm for 12 hours to completely evaporate the water;

[0043] (3) Grind the material after dehydration in step 2 and place it in a muffle furnace, heat it to 200ºC at a heating rate of 0.5ºC / min and keep it warm for 2 hours, then naturally drop to room temperature;

[0044] (4) The loose coke-like substance obtained in step 3 is ground in a mortar, and the ground powder is placed in a quartz boat to be carbonized;

[0045] ⑸Put the quartz boat in the tube furnace, pass in argon gas, the air flow rate is 0.3L / min, and start heating after half an hour. The heating conditions are: 5ºC / min to 300ºC, keep warm for 2h, 5ºC / min to 500ºC , hold for 5 hours, then raise the temperature to 1000°C at 5°C / min, hold for 5h, then cool down t...

Embodiment example 3

[0049] (1) Dissolve 20g of sucrose and 21.644g of ferric nitrate nonahydrate in 15g of deionized water at room temperature, and magnetically stir to fully dissolve and mix;

[0050] (2) Put the obtained solution in an 80ºC blast drying oven and keep it warm for 12 hours to completely evaporate the water;

[0051] (3) Grind the material after dehydration in step 2 and place it in a muffle furnace, heat it to 200ºC at a heating rate of 0.5ºC / min and keep it warm for 2 hours, then naturally drop to room temperature;

[0052] (4) The loose coke-like substance obtained in step 3 is ground in a mortar, and the ground powder is placed in a quartz boat to be carbonized;

[0053] ⑸Put the quartz boat in the tube furnace, pass in argon gas, the air flow rate is 0.3L / min, and start heating after half an hour. The heating conditions are: 5ºC / min to 300ºC, keep warm for 2h, 5ºC / min to 500ºC , hold for 5 hours, then raise the temperature to 1000°C at 5°C / min, hold for 5h, then cool down to...

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Abstract

The invention discloses a carbon negative electrode material for a lithium-ion battery. The material disclosed by the invention has a certain graphitization degree, is mainly composed of a graphite microcrystalline region and is randomly blended with an amorphous carbon component. The material has a typical graphite material characteristic diffraction peak (002) crystal face peak, without the needof being subjected to high-temperature graphitization treatment. A preparation method of the carbon negative electrode material roughly comprises the following steps: uniformly dissolving a carbon-containing compound which is easily dissolved into water, and a compound containing transition metal elements into a solvent; drying at low temperature of 60 DEG C to 100 DEG C firstly; then crushing and scorching at the temperature of 150 DEG C to 200 DEG C; crushing again and carbonizing under the protection of an inert atmosphere; after cooling to room temperature, carrying out acid washing, filtering and drying to obtain the carbon negative electrode material. The carbon negative electrode material disclosed by the invention has the characteristics of high capacity and good rate performance.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a carbon negative electrode material suitable for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are considered to be the most promising power source for electric vehicles. In order to meet the requirements of power sources, high-rate, high-capacity anode materials are crucial for lithium-ion batteries. Among the various negative electrode materials, graphite is the most widely used, but its theoretical capacity is only 372mAh / g, and the actual obtained capacity is often less than 360mAh / g. This reversible capacity is not satisfactory. Moreover, it is difficult for lithium ions to be embedded in graphite along the z-axis direction, resulting in poor performance during high-current charging and discharging, and lithium dendrites are easily formed on the surface, causing saf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583
CPCH01M4/583Y02E60/10
Inventor 吴彬彬刘锐剑吕猛胡博
Owner HUZHOU CHUANGYA POWER BATTERY MATERIALS