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CO3O4-C composite material and preparation method thereof, lithium battery and negative electrode thereof

A composite material, co3o4-c technology, applied in the field of lithium-ion batteries, can solve the problems of high volume expansion rate, high irreversible capacity, poor rate performance, etc., and achieve the effect of increasing specific surface area, high cycle stability, and shortening the diffusion path

Inactive Publication Date: 2011-12-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, transition metal oxide anode materials also have the following problems: high irreversible capacity for the first time; high volume expansion rate during cycling, resulting in low cycle life; because they are semiconductor materials, their poor conductivity leads to poor rate performance.
However, this type of hollow sphere structure also has some inevitable defects, such as: the large cavity volume causes the volume specific capacity of the system to decrease
In the multi-layer spherical structure, although the utilization rate of the cavity volume is slightly improved, the inner spherical shell cannot be in contact with the conductive agent outside the spherical shell, which makes the rate performance of the negative electrode material of this type of structure poor.

Method used

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  • CO3O4-C composite material and preparation method thereof, lithium battery and negative electrode thereof
  • CO3O4-C composite material and preparation method thereof, lithium battery and negative electrode thereof
  • CO3O4-C composite material and preparation method thereof, lithium battery and negative electrode thereof

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preparation example Construction

[0042] According to the second aspect of the present invention, the present invention also provides a Co 3 o 4 -C The preparation method of composite material, this method comprises the following steps:

[0043] (1) adding alkali lye to the oil-in-water emulsion, then standing and centrifuging successively, the oil-in-water emulsion contains water-soluble cobalt salt, surfactant, co-surfactant, organic solvent and water;

[0044] (2) coating the precipitate obtained after centrifugation on the base material;

[0045] (3) Under an inert atmosphere, the precipitate coated on the base material is fired for the first time at a first temperature;

[0046] (4) Under an atmosphere containing oxygen, the precipitate that is roasted for the first time is roasted for the second time at a second temperature to obtain Co that is covered on the surface of the base material. 3 o 4 -C composite material;

[0047] The first temperature is capable of carbonizing the surfactant, and the se...

Embodiment 1

[0086] This embodiment is used to illustrate the Co provided by the present invention 3 o 4 -C composite material and its preparation method and lithium ion battery negative electrode.

[0087] Get 7.5mmol cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) Dissolve in 150mL deionized water, then add 10mL Triton X-100 (purchased from Xilong Chemical Co., Ltd., TX-100), 5mL n-butanol and 2.5mL cyclohexane to it successively, under high-speed stirring Mix thoroughly for 30 minutes to obtain a pink, clear and transparent oil-in-water emulsion. Under stirring, slowly dropwise therein a concentration of 5 mass % ammonia solution, the amount of ammonia solution added is 35 mL, and the dropping process is controlled for 30 minutes to control the pH value of the oil-in-water emulsion to 10. After the dropwise addition, let it stand for 8 hours, then carry out centrifugation, and directly and evenly coat the lower sediment on one surface of the copper foil. The amount of the lower sediment coate...

Embodiment 2

[0091] This embodiment is used to illustrate the Co provided by the present invention 3 o 4 -C composite material and its preparation method and lithium ion battery negative electrode.

[0092] Take 20mmol cobalt chloride (CoCl 2 ·6H 2 O) Dissolve in 100mL deionized water, then add 15mL Triton X-100 (purchased from Xilong Chemical Co., Ltd., TX-100), 5mL n-butanol and 5mL cyclohexane to it successively, fully Mix for 30 minutes to obtain a pink, clear and transparent oil-in-water emulsion. Under stirring, slowly dropwise therein the ammonia solution whose concentration is 5% by mass, the amount of the ammonia solution added is 40 mL, and the dropping process is controlled for 25 minutes, so that the pH value of the oil-in-water emulsion is controlled to be 11. After the dropwise addition, let it stand for 4 hours, then carry out centrifugation, and directly and evenly coat the lower sediment on one surface of the copper foil. The amount of the lower sediment coated on the ...

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Abstract

The invention relates to a Co3O4-C composite material which comprises spinel-type Co3O4 and amorphous carbon, is granular, and each granule comprises a plurality of layered unfolded hemispherical layers. The invention also relates to a preparation method of the Co3O4-C composite material, and the method comprises the following steps: adding an alkali liquid into an oil-in-water emulsion, then allowing the solution to stand, and performing centrifugation processing, wherein the oil-in-water emulsion comprises a water-soluble cobalt salt, a surfactant, a cosurfactant, an organic solvent, and water; coating the precipitate obtained after the centrifugation processing on a substrate material; performing first roasting of the precipitate coated on the substrate material in inert atmosphere, then performing second roasting in oxygen-containing atmosphere. The invention also relates to a lithium ion battery cathode including the Co3O4-C composite material, and a lithium ion battery. The lithium ion battery prepared by using the Co3O4-C composite material of the invention as a cathode material has high specific capacity and rate capability.

Description

technical field [0001] The present invention relates to a Co 3 o 4 -C composite material, the Co 3 o 4 -The preparation method of C composite material, the Co prepared by said method 3 o 4 -C composite material, a lithium ion battery negative pole comprising the composite material, and a lithium ion battery comprising the lithium ion battery negative pole. Background technique [0002] Lithium-ion batteries have attracted much attention because of their advantages such as high working voltage, high specific energy, low self-discharge rate, non-toxic and environmental protection, and have become the main power source of electronic products and electrical equipment. However, with the updating of electronic products in recent years and people's extensive attention to energy and power, higher requirements have been put forward for lithium-ion batteries, which need to have higher energy density, higher power density and longer service life . [0003] Looking back at the de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/1391H01M4/131H01M10/0525
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 杨文胜孙洁陈旭刘海梅
Owner BEIJING UNIV OF CHEM TECH