Lithium ion battery cathode material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor cycle stability, many uncertain factors, and difficulty in mass production, and achieve excellent processing performance and long battery life , the process is easy to control the effect

Active Publication Date: 2013-05-01
RIGHTFUL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the past, alloy materials were once the first choice for people's research, but their poor cycle stability caused by low initial efficiency and high volume effect has not been well resolved. For example, tin oxide prepared by CVD method such as Hironorid can reversibly The capacity reaches 600mAh / g, but its irreversible capacity reaches 800mAh / g[J.Power Soμrces,2001,97-98:229], the efficiency is obviously low for the first time, and its shortcomings limit its application in lithium-ion batteries
The composite system of silicon particles wrapped with an amorphous carbon layer prepared by MAXwell, a subsidiary of Hitachi, has improved the structure and electrical conductivity of silicon materials, but due to the difficulty in controlling the process and many uncertain factors, it is difficult to achieve mass production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 (comparative example):

[0035] ①Material preparation: Weigh 150g of coal coke and 10g of asphalt, ready for use;

[0036] ②Feeding: Dissolve the prepared raw materials in the organic solvent carbon disulfide, alternately add them into the pressure vessel while stirring, continue to stir for 3 hours, and then add 9% of the total weight of beetroot oil within 20 minutes;

[0037] ③Heating up: Then heat up and heat up, within 6 hours, the temperature rises to 500°C for surface modification treatment; when the temperature rises for 3 hours, negative pressure extracts the volatiles in the above substances;

[0038] ④Keep constant temperature: keep constant temperature at 500°C for 4 hours, and extract volatile matter at the same time;

[0039] ⑤ Natural cooling to room temperature;

[0040] ⑥High temperature 3000℃, after 24 hours of graphitization treatment, then cool naturally.

[0041] Nitrogen or hydrogen gas is fed into the heat treatment process for pro...

Embodiment 2

[0046] Present embodiment ①~⑥ steps are completely identical with example 1;

[0047] ⑦Add 5g of carbon nanotubes for ultrasonic dispersion, pass the obtained powder through a 200-mesh sieve, and the sieved powder is the modified carbon powder sample;

[0048] Nitrogen or hydrogen gas is fed into the heat treatment process for protection, and other inert gases such as argon or its mixed gas can also be fed.

[0049] The obtained carbon modified material is spherical or ellipsoidal, with an average particle size D50 of 19.2 μm, a tap density of about 1.0 g / cc, and a BET specific surface area of ​​2.0 m 2 / g or so, the real density is about 1.25g / cc, and there are a lot of nanopores inside, the pore diameter is 0.2~0.6nm.

[0050] Other parts of this embodiment are identical to Embodiment 1.

[0051] The first discharge capacity of the material is 352.2mAh / g, and the first charge and discharge efficiency is 94.5%.

Embodiment 3

[0053] ①Material preparation: Weigh 120g of coal coke and 12g of asphalt and prepare for use;

[0054] ②Feeding: Dissolve the prepared raw materials in the organic solvent carbon disulfide, alternately add them into the pressure vessel while stirring, continue to stir for 2 hours, and then add 3% of the total weight of beetroot oil within 10 minutes;

[0055] ③Heating up: Then heating up, within 7 hours, the temperature rises to 500°C for surface modification treatment; when the temperature rises for 2 hours, negative pressure extracts the volatiles in the above substances;

[0056] ④Keep constant temperature: keep constant temperature at 500°C for 5 hours, and extract volatile matter at the same time;

[0057] ⑤ Natural cooling to room temperature;

[0058] ⑥High temperature 2800℃, after graphitization treatment for 48 hours, then cool naturally.

[0059] ⑦ Add 6g of carbon nanotubes for ultrasonic dispersion, pass the obtained powder through a 200-mesh sieve, and the sieve...

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Abstract

The invention relates to a lithium ion battery cathode material, which is prepared from coal coke, asphalt and a carbon nanotube in the weight ratio of (5-40):1:0.5. In the lithium ion battery cathode material, the particle size of the coal coke is 8-25 mum, and the specific surface area of the coal coke is less than or equal to 5m<2> / g; and the asphalt is coal asphalt or petroleum asphalt. A carbon modified material provided by the invention can be widely applied to a power lithium ion battery cathode material with a long cycle life. The material belongs to compound graphite, and has the advantages of high cycle performance, long battery service life, large gram volume, high compacted density, small specific surface area and excellent processing performance.

Description

technical field [0001] The invention relates to a negative electrode carbon material of a power lithium ion battery with high cycle life and a preparation method thereof. Background technique [0002] At present, with the rapid development of international new energy and new materials, the wide use and rapid development of various new energy electric vehicles, portable electronic equipment, and electric tools, the requirements for chemical power sources are also increasing one after another. Lithium-ion batteries are currently developed relatively successfully. It is a portable chemical power supply, which has the advantages of high voltage, large specific energy, stable discharge voltage, good low temperature performance, excellent safety performance, easy storage and long working life. However, with the widespread application of electric vehicles, the miniaturization and miniaturization of electronic equipment is getting higher and higher, and the research and application ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62
CPCY02E60/12Y02E60/10
Inventor 程先桃王树新
Owner RIGHTFUL TECH
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