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Method for producing siOx (X<1)

A x is not necessarily satisfactory and other problems, to achieve the effect of excellent initial charging efficiency

Inactive Publication Date: 2008-05-07
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, although these prior art attempts have effectively improved the charge-discharge capacity as well as the energy density, they are not necessarily satisfactory in terms of maintaining their performance over repeated use cycles or meeting market demands, thus further improving the energy density

Method used

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  • Method for producing siOx (X&lt;1)

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Embodiment 1 to 3 and comparative example 1 and 2

[0033] SiO is produced using the production system shown in Figure 1 x . The amount of silicon oxide powder (325# PASS) shown in Table 1 was placed in the second material tray (5) as a starting material for generating silicon oxide gas, and the amount of metal silicon powder shown in Table 1 was placed in the first- in the material tray (4). The material tray was inserted into a reaction tube (2) with a diameter of 80 mm. Next, the inside of the reaction furnace is evacuated to a pressure of up to 0.1 Torr with a vacuum pump, and then the first material tray (4) is heated and maintained at 2,200°C with a heater (1), while the second material tor and maintained at 1,430°C. After this operation was continued for 5 hours, the temperature was lowered to room temperature in order to precipitate the gas on the substrate (3). In Figure 1, "6" represents a thermocouple.

[0034] Next, in a 2 L alumina ball mill, 1,000 g of alumina balls with a diameter of 5 mm were used as a med...

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Abstract

A method for producing a SiOx (x<1) is provided. The SiOx produced is adapted for use as an anode material in producing a lithium ion secondary battery having a large capacity which does not experience degradation with repeated cycles of use, and which has low irreversible capacity in the initial charge and discharge. The method for producing a SiOx (x<1) comprises the steps of heating a starting material which generates a silicon oxide gas to a temperature in the range of 1,100 to 1,600 DEG C. in the presence of an inert gas or under a reduced pressure to produce the silicon oxide gas, while heating is metal silicon to a temperature in the range of 1,800 to 2,400 DEG C. in the presence of an inert gas or under a reduced pressure to generate silicon gas, and precipitating the gas mixture of the silicon oxide gas and the metal silicon gas on a surface of a substrate.

Description

technical field [0001] The present invention relates to a SiO effective as an anode material for lithium-ion secondary batteries x (x<1) manufacturing method. Background technique [0002] With the rapid development of mobile electronic devices and communication devices, secondary batteries with high energy density are highly desired in consideration of improving economic efficiency and reducing the size and weight of the devices. For example, by mixing oxides of V, Si, B, Zr, Sn, etc. or their mixtures in the anode material (for example, JP-A 5-174818, JP-A 6-60867 corresponding to USP 5,478,671: Patent Document 1 and 2), by using molten and annealed metal oxide as an anode material (JP-A 10-294112: Patent Document 3), by using silicon oxide as an anode material (Japanese Patent Corresponding to USP5,935,711 No.2997741: Patent Document 4), and Si 2 N 2 O and Ge 2 N 2 O is used as an anode material (JP-A 11-102705 corresponding to USP 6,066,414: Patent Document 5), ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/10C23C14/24C23C14/54C01B33/113H01M4/02H01M4/48
CPCY02E60/122C01B33/113H01M4/131H01M10/052C23C14/10H01M4/485Y02E60/10C01B33/00C01B33/12
Inventor 福冈宏文荒又干夫宫脇悟
Owner SHIN ETSU CHEM CO LTD