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Preparation method of silicon carbon and aluminum oxide compounded lithium ion battery cathode material

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor conductivity and low initial efficiency, and achieve good conductivity, high efficiency, and improved cycle performance.

Inactive Publication Date: 2019-06-14
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But SiO x It also has the disadvantages of poor conductivity and low initial efficiency.

Method used

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  • Preparation method of silicon carbon and aluminum oxide compounded lithium ion battery cathode material

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preparation example Construction

[0023] The invention discloses a method for preparing a lithium-ion battery negative electrode material composed of silicon oxygen carbon and aluminum oxide, which includes the following steps:

[0024] (1) Pre-disproportionation treatment of silicon oxide and mixing with graphite:

[0025] 1.1) Weigh a certain amount of SiO x powder, placed in a crucible, heated to 1050°C in a tube furnace, and kept for 3h, the SiO x nanoscale SiO x .

[0026] 1.2) After the heat preservation is over, wait for the SiO x Naturally cooled to room temperature and taken out to obtain predisproportionated SiO x powder.

[0027] 1.3) Will process SiO x Powder is mixed with artificial graphite in a certain proportion, the SiO x The ratio of powder to artificial graphite is (2-3): (7-8).

[0028] 1.4) Heat the sample mixed in step 1.3) to 700°C at 3°C / min, keep it warm for 2h under the protection of nitrogen atmosphere, and obtain SiO after cooling x / C complex.

[0029] (2) The prepared Si...

Embodiment 1

[0035] Using Nanoscale SiO x Powder, weigh a certain weight after predisproportionation treatment, and weigh artificial graphite powder according to the mass ratio of 2:8 with graphite. Heat to 700°C at 3°C / min according to the set temperature rise curve, take it out after keeping it for 2 hours. Add a certain amount of deionized water to the sintered mixture, and then add aluminum nitrate (AlNO 3 •9H 2 O) The solution is slowly added ammonia water according to the molar ratio, so that Al 2 o 3 precipitated on SiO x / C, then dry the mixture, add 10% of the total mass of pitch for mixing, put it into the sintering furnace at a rate of 3°C / min, gradually rise to 800°C, and keep it for 3h to get the final product SiO x / C-Al 2 o 3 composite material.

[0036] From figure 1 It can be seen that graphite will SiO x with Al 2 o 3 wrapped together.

Embodiment 2

[0038] SiO x The ratio of powder and artificial graphite becomes 2.1:7.9, and other operation steps are identical with embodiment 1.

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Abstract

The invention discloses a preparation method of a silicon carbon and aluminum oxide compounded lithium ion battery cathode material. The preparation method comprises the following steps of: (1) pre-disproportionation of silicon oxide and graphite mixing: 1.1) weighing a certain amount of SiOx powder, placing the SiOx powder in a crucible, heating the crucible to 1050 DEG C in a tubular furnace andpreserving the heat for 3 h, 1.2) after the heat preservation, naturally cooling the SiOx to room temperature and taking out the SiOx to obtain pre-disproportioned SiOx powder, and 1.3) mixing the treated SiOx powder with synthetic graphite according to a certain proportion; and (2) compounding a prepared SiOx / C compound with Al2O3. When the method is adopted to modify SiOx, besides the graphite,the other metal oxide Al2O3 can be used as a coating material, and the metal oxide Al2O3 is beneficial for the forming and protection of an SEI membrane of the SiOx in the charging / discharging process, thereby greatly enhancing the cycle performance of final products, making the conductivity better and making the first efficiency higher.

Description

technical field [0001] The invention relates to the technology in the field of negative electrode materials, in particular to a method for preparing a lithium ion battery negative electrode material composed of silicon oxygen carbon and alumina. Background technique [0002] As the problem of environmental pollution gradually deepens, the development of new energy sources is becoming more and more urgent. Lithium-ion batteries are widely used in various electronic devices and electric vehicles because of their high specific capacity and excellent cycle performance. At present, the negative electrode material of commercial lithium-ion batteries is mainly graphite, but the maximum theoretical lithium storage capacity of graphite is only 372mAh / g, which limits the further improvement of the specific capacity of lithium-ion batteries. Therefore, finding high-capacity anode materials that can replace graphite has become a hot spot in the research and development of key materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCY02E60/10
Inventor 杨昌平赵东辉周鹏伟
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD