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Lithium ion secondary negative electrode material and its making method

A technology for secondary batteries and lithium ions, which is applied in secondary batteries, battery electrodes, electrode manufacturing, etc., can solve the problems of batteries not functioning properly and loss of cycle performance, and achieve simple and effective preparation methods, good cycle performance, and high The effect of capacity

Inactive Publication Date: 2009-07-15
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the battery cannot perform to its actual level, because the cycle performance is lost or the charge / discharge capacity of the battery must be limited to prevent the cycle performance from deteriorating.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example

[0031] In order to clarify the present invention, some examples and comparative examples are listed below, but the present invention is not limited thereto.

example 1

[0033] An alumina crucible was filled with 100 g of metallic silicon powder with an average particle size of 5 microns and placed in a gas furnace in which surface oxidation treatment was performed at 800° C. for 3 hours. The oxidized product is a compound containing metal silicon, the oxygen content in this compound containing metal silicon reaches 13wt%, and the surface is covered with silicon dioxide.

[0034] Battery evaluation:

[0035] The battery was fabricated by using a compound containing metal silicon as the negative electrode active material, and the operation for evaluating the battery was as follows.

[0036] Artificial graphite having an average particle size of 5 micrometers was added to the metallic silicon-containing compound to form a mixture in which the carbon content was 40% by weight. 10% of polyvinylidene fluoride and N-methylpyrrolidone were then added to the mixture to form a slurry. The paste was coated onto a 20-micron thick copper foil and dried ...

example 2

[0041] An alumina crucible containing 100 g of the metallic silicon-containing compound obtained in the first example was placed in an environmentally controlled furnace. In an argon flow at a rate of 2.0 NL / min, the crucible was heated to 1,100° C. at a heating rate of 300° C. / hr and maintained at this temperature. After the temperature reaches 1,100 °C, CH 4 Gas was added at a flow rate of 2.0 NL / min. In this case, chemical vapor deposition was performed for 3 hours. At the end of the process, after the furnace is cooled, a black powder is obtained on it. After vapor precipitation, the black powder was a metallic silicon-containing compound covered with a conductive coating, and the weight content of graphite was 22.5 wt% of the total weight of the metallic silicon-containing compound.

[0042] As in Example 1, a lithium-ion secondary battery was fabricated using a metal-silicon-containing compound covered with a conductive coating. The battery was tested according to th...

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Abstract

The metal-silicon-containing composite is useful as a negative electrode material when making a lithium-ion secondary battery. The metallic silicon core is covered with an inert material that has no effect on the adsorption and desorption of lithium ions. Using this composite as a negative electrode active material, a lithium-ion secondary battery with large capacity and good cycle performance can be manufactured.

Description

technical field [0001] The present invention relates to a lithium ion secondary battery negative electrode material and a manufacturing method thereof. When used as a negative electrode active material, it has high charge / discharge capacity and satisfactory cycle performance. Background technique [0002] With the rapid development of current portable electronic devices and communication tools, a secondary battery with high energy density is urgently needed in consideration of factors such as economy, size, and weight. The prior art method of improving secondary battery capacity comprises: negative electrode comprises silicon powder, electrical conductor and binding agent (with reference to Japanese patent NO 3,008,269), and negative electrode material comprises oxides such as V, Sj, B, Zr, Sn and their Composite oxide (refer to JP-A 5-174818 and JP-A 6-60867 corresponding to USP5,478,671), the negative electrode material is obtained by cooling the melt of metal oxide (refer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/00C01B33/02B05D5/12H01M4/02H01M4/04H01M4/36H01M4/38H01M4/587H01M4/62
CPCH01M4/625H01M4/366H01M4/38H01M4/0471H01M10/0525Y02E60/122H01M4/386Y02E60/10H01M4/58H01M4/04H01M4/02
Inventor 福冈宏文荒又干夫籾井一磨宫脇悟
Owner SHIN ETSU CHEM CO LTD