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Copper-containing silicon material, method for manufacturing same, negative-electrode active substance, and secondary cell

A manufacturing method and technology of silicon materials, applied in the direction of secondary batteries, non-aqueous electrolyte batteries, lithium batteries, etc., can solve the problems of reduced cycle characteristics, easy condensation, high energy, etc., and achieve the effect of improving electronic conductivity

Inactive Publication Date: 2017-02-22
TOYOTA IND CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in the production method described in Patent Document 2, high energy is required for plasma discharge.
In addition, it is presumed that in the silicon composite obtained by these production methods, the dispersibility of the silicon particles in the Si phase is low and they are easily aggregated.
If the silicon particles are aggregated and the particle size becomes large, the initial capacity of the secondary battery using it as the negative electrode active material will be low, and the cycle characteristics will also be reduced.

Method used

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  • Copper-containing silicon material, method for manufacturing same, negative-electrode active substance, and secondary cell
  • Copper-containing silicon material, method for manufacturing same, negative-electrode active substance, and secondary cell
  • Copper-containing silicon material, method for manufacturing same, negative-electrode active substance, and secondary cell

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Embodiment 1

[0079]

[0080] Calcium metal, copper metal and silicon metal were weighed into a carbon crucible at an atomic ratio of Ca:Cu:Si=1.05:0.25:1.65, and heated to about 1300°C with a high-frequency induction heating device to melt it. The molten metal was poured into a predetermined mold for casting, and the obtained ingot was pulverized and classified with a sieve to a particle size passing through a sieve opening of 53 μm. The powder is CaCu x Si y Copper-containing calcium silicide represented by (x=0.25, y=1.65, x+y=1.9).

[0081] The XRD pattern of the copper-containing calcium silicide obtained is shown in figure 1 . As the X-ray source, Cu-Kα rays are used. Using the X-ray diffraction pattern (diffraction angle 2θ = range of 10 to 90°) obtained by the measurement, the analysis was performed with analysis software (software name: PDXL). figure 1 All the diffraction peaks shown in can be indexed to the structure of space group P6 / mmm of International Table Notation 191...

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Abstract

Provided is a negative-electrode active substance having enhanced electron conductivity. In the present invention, a copper-containing silicon material is obtained by reacting copper-containing calcium silicide represented by the formula CaCuxSiy with oxygen and heat-treating the reaction product in a non-oxidizing atmosphere. The copper-containing silicon material includes Si and copper in an amorphous phase, and fine copper silicides are uniformly deposited in the amorphous phase, and the copper-containing silicon material therefore has enhanced electron conductivity. A secondary cell which uses the negative-electrode active substance in a negative electrode thereof therefore has enhanced lead characteristics and increased charge / discharge capacity.

Description

technical field [0001] The present invention relates to a copper-containing silicon material used in negative electrode active materials such as lithium ion secondary batteries, a method for producing the same, and a secondary battery using the copper-containing silicon material as a negative electrode active material. Background technique [0002] A lithium ion secondary battery is a secondary battery that has a high charge and discharge capacity and can achieve high output. At present, it is mainly used as a power source for portable electronic devices, and it is also expected to become a power source for electric vehicles, which is expected to spread in the future. Lithium ion secondary batteries have active materials capable of inserting and extracting lithium (Li) in the positive electrode and the negative electrode, respectively. Furthermore, it operates by moving lithium ions in the electrolyte solution provided between the two electrodes. [0003] In lithium ion se...

Claims

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Application Information

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IPC IPC(8): C01B33/06H01M4/38H01G11/30H01G11/86
CPCC01B33/06H01G11/30H01G11/86H01M10/052H01G11/50H01M4/386Y02T10/70Y02E60/10Y02E60/13H01M10/0525
Inventor 原田正则毛利敬史
Owner TOYOTA IND CORP
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