Lithium ion battery cathode material with two-shell layer structure and preparation method thereof

A lithium-ion battery and negative electrode material technology, which is applied to battery electrodes, structural parts, circuits, etc., to achieve the effect of simple preparation process

Inactive Publication Date: 2014-01-29
CHINA FIRST AUTOMOBILE
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Lithium ion battery cathode material with two-shell layer structure and preparation method thereof
  • Lithium ion battery cathode material with two-shell layer structure and preparation method thereof

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Embodiment 1

[0021] figure 1 As shown, commercial silicon powder with a particle size of 20nm and aluminum nitrate were dissolved in a deionized aqueous solution at a molar ratio of 1:0.35, and stirred at a high speed at a temperature of 80 o C, until the water is completely evaporated; the powder obtained in the above steps is placed in a tube furnace with argon protection for sintering, the sintering time is 3h, and the sintering temperature is 650 o C, carry out cooling at room temperature; then above-mentioned product and sucrose are mixed by dehydrated alcohol according to the ratio of mass ratio 1: 3.8, utilize high-energy ball mill to carry out ball milling, ball milling time is 10h; Finally ball milling gained slurry 100 o After C is dried, place it again in a tube furnace with argon protection for sintering for 5 hours, and the sintering temperature is 750 o C, after cooling at room temperature, the anode material with "silicon / alumina / carbon" double-shell structure can be obtain...

Embodiment 2

[0023] Dissolve commercial silicon powder with a particle size of 300nm and zinc nitrate in a deionized aqueous solution at a molar ratio of 1:0.05, and stir at a high speed at 120 o C, until the water is completely evaporated; the powder obtained in the above steps is placed in a tube furnace with nitrogen protection for sintering, the sintering time is 6h, and the sintering temperature is 300 o C, carry out room temperature cooling; Then above-mentioned product and grape are mixed by acetone according to the ratio of mass ratio 1: 2.5, utilize high-energy ball mill to carry out ball milling, ball milling time is 15h; Finally ball milling gained slurry 100 o After C drying, place it again in a tube furnace with nitrogen protection for sintering for 10 hours, and the sintering temperature is 600 o C, after cooling at room temperature, the anode material with "silicon / zinc oxide / carbon" double-shell structure can be obtained.

Embodiment 3

[0025] Dissolve commercial silicon powder with a particle size of 150nm and zirconium nitrate in a deionized aqueous solution at a molar ratio of 1:0.2, and stir at a high speed at a temperature of 100 o C, until all the water is evaporated; the powder obtained in the above steps is placed in a vacuum furnace for sintering, the sintering time is 5h, and the sintering temperature is 500 o C, then carry out room temperature cooling; The above-mentioned product and polyethylene are mixed by dehydrated alcohol according to the ratio of mass ratio 1: 2.2, utilize high-energy ball mill ball mill 11h; Ball mill gained slurry 100 o After drying at C, place at 700 o Sinter in a vacuum sintering furnace for 7 hours, and cool down at room temperature to obtain a negative electrode material with a double-shell structure of "silicon / zirconia / carbon".

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Abstract

The invention relates to a lithium ion battery cathode material with a two-shell layer structure, which is characterized by consisting of two shell layers, wherein the first shell layer is a metal oxide shell layer, and the second shell layer is made of an intangible carbon shell layer material; the first shell layer wraps the surface of silicon particles, and the second shell layer wraps the surface of the first shell layer; the metal oxide shell layer is one of aluminum oxide, zirconium oxide and zinc oxide; and the intangible carbon shell layer is prepared by carbonizing sucrose, glucose and polyethylene. The reaction interface of the electrolyte and silicon powder is lowered and the side reaction is reduced by use of oxide; and with the flexibility and scalability of the carbon material, the problem of chalking caused by the silicon volume expansion is reduced. Moreover, the invention also provides a preparation method of the cathode material, wherein the method realizes simple preparation and has the possibility of batch production.

Description

technical field [0001] The invention relates to a double-shell structure lithium ion battery negative electrode material and a preparation method thereof, in particular to a double-shell structure silicon / oxide / carbon negative electrode material and its preparation method, belonging to lithium ion batteries field of materials technology. Background technique [0002] In 1990, SONY launched the first lithium-ion battery. The battery material carbon material was used as the negative electrode, and lithium cobalt oxide material was used as the positive electrode. Due to the advantages of very high energy density, safety, environmental friendliness, and no memory effect, the battery quickly replaced the more mature Ni-MH battery on the market and became the main power source for digital products and mobile phones. After more than 20 years of development and technological innovation, today's lithium-ion battery technology has made greater progress, and its application range is b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48
CPCH01M4/362H01M4/366Y02E60/10
Inventor 姜涛陈慧明张斌张克金
Owner CHINA FIRST AUTOMOBILE
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