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Conductive silicon oxide powder, its mfg. method and negative electrode material of nonaqueous electrolyte secodary battery

A technology of silicon oxide powder and non-aqueous electrolyte, which is applied in the direction of non-aqueous electrolyte battery electrodes, non-aqueous electrolyte batteries, conductive materials, etc., and can solve the problems of limited charge/discharge capacity, insufficient conductivity, and inability to withstand practical applications. , to achieve the effect of improving cycle performance and high capacity

Inactive Publication Date: 2003-07-09
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As for the technique of making the negative electrode material conductive, the conductivity provided by JP2000-243396A is not sufficient due to solid-solid fusion, not forming a uniform carbon coating
JP2000-215887A succeeded in forming a uniform carbon coating, but the silicon-based anode material experienced very significant expansion and contraction when absorbing and releasing lithium ions, and as a result, could not withstand practical application
At the same time, the cycle performance decreases, and to prevent this decrease, the charge / discharge capacity must be limited

Method used

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  • Conductive silicon oxide powder, its mfg. method and negative electrode material of nonaqueous electrolyte secodary battery

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0031] use figure 1 The batch fluidized bed reactor system shown in , describes the conductive silica powder prepared by the following method. figure 1 The system comprises a fluidized bed reactor 1 with a gas distributor 4 forming a fluidized bed 2 thereon, a heater 3 surrounding the reactor, and a gas delivery line 7 with a gas stirrer 5 and a flow meter 6 . pumped by suitable means, measured by flow meter 6, mixed Ar and CH in gas stirrer 5 4 Gas, the gas mixture is delivered from the gas stirrer to the reactor 1 through the delivery line 7 and injected into the reactor chamber through a plurality of orifices 4 a in the gas distributor 4 . The silicon oxide powder is allowed to enter the reactor chamber, and the gas is injected to form a fluidized bed 2 of the silicon oxide powder. The reactor 1 has a gas release line 8 and a differential pressure gauge 9 .

[0032] Preparation of pristine silica powder

[0033] For silica powders of equal molar ratio (BET surface area ...

example 2

[0044] Preparation of pristine silica powder

[0045] For silica powders of equal molar ratio (BET surface area = 200m 2 / g) and ceramic grade metal silicon powder (BET surface area = 4m 2 / g) of the powder mixture was heat-treated at 1,350°C in a hot vacuum atmosphere of 0.1 Torr. The resulting SiO gas is deposited on a water-cooled stainless steel substrate. The precipitate was collected and ball milled in hexane. Properly adjust the grinding time to generate D 50 = 0.8 μm silicon oxide powder (SiOx powder).

[0046] The silicon oxide powder obtained is SiOx powder, wherein x=1.05, and the electric conductivity measured by four-terminal method is 3 * 10 -9 S / m. by solid-state NMR ( 29 SiDD / MAS) when analyzing SiOx powder, the spectrum includes two separate peaks, a broad peak (A1) centered at -70ppm and another broad peak (A2) centered at -110ppm, the area ratio of these peaks is A1 / A2 is 0.68.

[0047] Preparation of conductive silicon oxide powder (CVD treatment) ...

example 3

[0056] In addition to making the change in the fluidized bed heat treatment of Example 2 to 3.3NL / minAr gas and 0.6NL / minCH 4 Gas (Ar gas and CH 4 Gas ratio is 11:2), repeat the procedure of Example 2. The conductive silicon oxide powder thus obtained has a 5×10 -1 S / m conductivity with 10.3 wt% carbon deposited thereon. Using this conductive silicon oxide powder, a battery was constructed and tested in the same manner as in Example 2. The results are shown in Table 1.

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Abstract

A conductive silicon oxide powder in which particles of silicon oxide having the formula: SiOx wherein 1 ‰¤ x < 1.6 are covered on their surfaces with a conductive carbon coating by chemical vapor deposition treatment is useful as a negative electrode active material to construct a lithium ion secondary cell having a high capacity and improved cycle performance.

Description

technical field [0001] The present invention relates to a silicon oxide powder with electrical conductivity used as a negative electrode active material in a lithium ion secondary battery, a method for preparing the silicon oxide powder, and a negative electrode material for a nonaqueous electrolyte secondary battery. Background technique [0002] Recently, with the rapid development of portable electronic devices and communication devices, secondary batteries having high energy density are highly demanded from the standpoint of economy, size and weight reduction. Prior art attempts to increase the capacity of secondary batteries using V , Si , B , Zr , Sn etc. oxides or their composite oxides (JP5-174818A, JP6-60867A corresponding to USP5478671), melt-quenched metal oxides (JP10-294112A), silicon oxide (Japanese Patent 2997741 corresponding to USP5395711) and Si 2 N 2 O or Ge 2 N 2 O (corresponding to JP11-102705A of USP6066414) is used as the negative electrode mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/442C09C1/30H01M4/02H01M4/04H01M4/13H01M4/134H01M4/36H01M4/38H01M4/48H01M4/485H01M4/62H01M10/05H01M10/052H01M10/0525H01M10/36
CPCY02E60/12H01M10/0525H01M2004/027C01P2004/62H01M10/052H01M4/0428H01M4/0404H01M4/366H01M4/485H01M2004/021C01P2006/40H01M4/38H01M4/04C09C1/3045H01M4/0471Y02E60/122Y02E60/10H01M4/02
Inventor 福冈宏文宫胁悟籾井一磨荒又干夫上野进
Owner SHIN ETSU CHEM IND CO LTD
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