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Silicon cathode, lithium ion secondary battery comprising the same and manufacturing method therefor

A secondary battery and silicon negative electrode technology, applied in the direction of secondary batteries, electrode manufacturing, battery electrodes, etc., can solve the problem of low volume specific capacity of lithium-ion secondary batteries, and achieve good cycle performance, high volume specific capacity, capacity Enhanced effect

Inactive Publication Date: 2009-03-25
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to overcome the defect that the volume specific capacity of the lithium ion secondary battery using the existing silicon negative pole is low, and to provide a lithium secondary battery with a high volume specific capacity and good cycle performance, the silicon negative pole of the battery and their preparation method

Method used

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preparation example Construction

[0017] According to the preparation method of the silicon negative electrode of the present invention, the silicon negative electrode includes a conductive substrate and a material layer supported on the surface of the conductive substrate, wherein the material layer is composed of a carbon material layer and a silicon layer, and the method includes first A carbon material layer is attached on the conductive substrate, and then a silicon layer is attached on the carbon material layer.

[0018] According to the present invention, the method for adhering the silicon layer on the carbon material layer is the method of magnetron sputtering ion plating or the method of evaporation plating.

[0019] The method of attaching a silicon layer on a carbon material layer by magnetron sputtering ion plating includes, under the condition of magnetron sputtering silicon, applying power to the magnetron target to sputter the target material silicon of the magnetron target and deposited on the...

Embodiment 1

[0042] This embodiment illustrates the preparation of the lithium ion secondary battery provided by the invention

[0043] (1) Preparation of silicon negative electrode

[0044] Fully mix and stir graphite, carboxymethyl cellulose, styrene-butadiene rubber and water according to the weight ratio of 10:1:1:60 to obtain a uniform slurry, and evenly coat the slurry on a conductive substrate copper with a thickness of 0.008 mm. Both sides of the foil were dried at 100° C. and rolled to obtain a carbon material layer with a thickness of 80 microns on one side.

[0045] Using magnetron sputtering ion plating equipment (multi-arc-magnetron sputtering ion coating machine, manufactured by Beijing Beiyi Innovation Vacuum Technology Co., Ltd., model JP-700), the above-mentioned conductive substrate copper foil loaded with carbon material layer Put it on the workpiece rack in the vacuum chamber of the magnetron sputtering ion plating equipment, start the vacuum pump to evacuate, and the ...

Embodiment 2

[0050] This embodiment illustrates the preparation of the lithium ion secondary battery provided by the invention

[0051] Prepare lithium-ion secondary battery according to the method of embodiment 1, difference is, the preparation method of silicon negative electrode is, adopts vacuum evaporation plating equipment (manufactured by Tengsheng Vacuum Technology Engineering Co., Ltd., Zhaoqing City, Guangdong Province, model is TS-600ZZS), Put the conductive substrate copper foil loaded with carbon material layer on the workpiece rack in the vacuum chamber of the vacuum evaporation plating equipment, start the vacuum pump to vacuumize, and the vacuum degree (absolute pressure) in the vacuum chamber reaches 8×10 -3 Pa. The silicon particles of the evaporation material are placed in the crucible of the vacuum evaporation equipment, and the conductive base copper foil is placed above the crucible.

[0052] Simultaneously start the DC power supply applied to the electron gun, turn ...

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Abstract

A silicon negative electrode of a lithium ion secondary battery comprises a conductive matrix and a material layer loaded on the surface of the conductive matrix, wherein the material layer is composed of a carbon material layer and a silicon layer; the carbon material layer is attached to the conductive matrix; and the silicon layer is attached to the carbon material layer. The battery prepared by the silicon negative electrode has both the higher volume ratio capacity and the favorable circulation performance.

Description

technical field [0001] The present invention relates to a battery negative pole, a battery using the negative pole and their preparation method, specifically, the present invention relates to a silicon negative pole of a lithium ion secondary battery, a lithium ion secondary battery using the silicon negative pole and their Preparation. Background technique [0002] Due to the rapid development and wide application of portable electronic devices and electric vehicles, there is an urgent need for lithium-ion batteries with high specific energy and long cycle life. At present, commercially used lithium-ion batteries mainly use graphite as the negative electrode material. However, since the theoretical specific capacity of graphite is only 372 mAh / g, further improvement of the specific energy of lithium-ion batteries is limited. Silicon has attracted much attention because of its extremely high theoretical lithium storage capacity (4200 mAh / g) and low lithium intercalation pot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/38H01M4/58H01M4/62H01M4/04C23C14/35C23C14/24H01M10/40H01M10/38
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 周耀华马青云
Owner BYD CO LTD
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