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Electrode material comprising silicon and/or tin particles and production method and use thereof

A technology of electrode materials and silicon particles, applied in battery electrodes, active material electrodes, non-aqueous electrolyte battery electrodes, etc., can solve problems such as increased internal resistance, inability to maintain contact, and material damage

Inactive Publication Date: 2006-01-04
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Consequently, the electrode material has problems in that the material is significantly damaged due to repeated charge / discharge cycles, and the internal resistance value (especially at low temperature) increases
Therefore, the carbonaceous material has problems in that electrical conductivity is low, large current characteristics are impaired, contact between particles cannot be maintained due to expansion or cracking of the particles at the time of charging / discharging, resulting in deterioration of cycle characteristics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0223] The silicon material was pulverized and classified to prepare silicon particles having an average particle diameter (D50) of 20 μm. Separately, ethanol was added to Varnish A and the resulting mixture was stirred, thereby completely dissolving Varnish A in the ethanol. The resulting solution was added to the above-prepared silicon particles (100 g) so that the amount of the modified phenol resin solids became 10% by mass based on all the silicon particles, and the resulting mixture was kneaded by a planetary mixer for 30 minute. Vapor-grown carbon fibers graphitized at 2,800° C. (the average diameter of the filaments of the carbon fibers is 150 nm, and the average aspect ratio of the filaments is 100) (0.1% by mass) were added to the obtained mixture, and stirred The resulting mixture. The resulting mixture was dried in a vacuum drying apparatus at 80° C. for 2 hours, thereby removing the ethanol. Subsequently, the mixture thus dried was placed in a heating furnace, ...

Embodiment 2

[0225] The process of Example 1 was repeated, except that the added amount of the vapor-grown carbon fiber was changed to 3% by mass, so as to obtain a negative electrode material sample. In the same manner as the sample of Example 1, battery evaluation was performed on the sample obtained above by means of a single-cell battery evaluation device. The battery evaluation was performed using the EC electrolytic solution. In the charge / discharge cycle test, the capacity at the 1st cycle and the capacity at the 50th cycle were measured. The results are shown in Table 1.

Embodiment 3

[0227] The process of Example 1 was repeated, except that the added amount of the vapor-phase grown carbon fiber was changed to 10% by mass, so as to obtain a negative electrode material sample. In the same manner as the sample of Example 1, battery evaluation was performed on the sample obtained above by means of a single-cell battery evaluation device. The battery evaluation was performed using the EC electrolytic solution. In the charge / discharge cycle test, the capacity at the 1st cycle and the capacity at the 50th cycle were measured. The results are shown in Table 1.

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Abstract

The invention provides an electrode material comprising at least one kind of particles from silicon particles, tin particles, silicon compound particles, and stannic compound articles, and carbon fibre. The particles comprises: (1) at least one kind of particles from silicon particles, tin particles, silicon compound particles containing lithium ions which can be inserted and discharged, and tin compound particles containing lithium ions which can be inserted and discharged; or (2) carbon particles containing silicon and / or silicone compound deposited on partial surface of the carbon particles in plumbago structure. Lithium secondary battery adopting the electrode material as a cathode has the advantages of high loading capacity, cycle performance and excellent characteristics under high current load.

Description

[0001] Cross References to Related Applications [0002] This application is filed pursuant to 35 U.S.C. Section 111(a) and is subject to the requirements of 35 U.S.C. Section 111(b) filed December 4, 2002 pursuant to 35 U.S.C. Section 119(e)(1) Priority to US Provisional Application No. 60 / 430,646, filed December 11, 2002, and US Provisional Application No. 60 / 432,250, filed December 11, 2002. technical field [0003] The invention relates to an electrode material and its manufacturing method and use. In particular, the present invention relates to an electrode material used as a negative electrode in a non-aqueous electrolyte secondary battery having high capacity, excellent cycle characteristics, and excellent characteristics under a large current load, its manufacturing method, an electrode formed of the material, and A non-aqueous electrolyte secondary battery comprising the electrode. More particularly, the present invention relates to an electrode material used as a n...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/02H01M10/40H01M4/13H01M4/134H01M4/136H01M4/36H01M4/38H01M4/48H01M4/62H01M10/05H01M10/052H01M10/0569
CPCY02E60/122Y02E60/10
Inventor 南波洋一饭生悟史增子努
Owner SHOWA DENKO KK
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