Monox powder containing Li and its manufacture

A technology of lithium silicon oxide and powder, which is applied in the field of manufacturing this lithium-containing silicon oxide powder, can solve problems such as not clearly describing lithium-containing silicon oxide

Inactive Publication Date: 2003-04-02
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent does not clearly describe how to prepare lithium-containing silica

Method used

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  • Monox powder containing Li and its manufacture
  • Monox powder containing Li and its manufacture
  • Monox powder containing Li and its manufacture

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0038] 200g of SiO with a weight ratio of 90:10 was loaded into the silicon nitride tray z Powder (z=1.05, BET specific surface area=33.5m 2 / g) and the mixture of lithium hydroxide hydrate are placed in a reaction furnace with an effective volume of 15 liters. While argon gas was flowing through the furnace at a flow rate of 10 NL / min, the reaction was performed at a temperature of 900° C. for 3 hours to obtain 160 g of raw lithium-containing silicon oxide powder. The BET specific surface area of ​​unprocessed powder is 5.8m 2 / g.

[0039] 100 g of raw powder was ground in a 2 liter alumina ball mill using 1000 g of alumina balls with a diameter of 5 mm as grinding media and 500 g of hexane as solvent, working at 1 rpm. At the end of milling, the lithium-containing silica powder has an average particle size D of 4.3 μm 50 、14.2m 2 / g BET specific surface area, 1.3wt% lithium content and 33.5wt% oxygen content, by the general formula SiLi x o y Indicates that x=0.08, y=...

example 2-6 and comparative example 1-5

[0045] In addition to the raw material SiO z , lithium compound, SiO z Lithium-containing silicon oxide powder was prepared in the same manner as in Example 1 except that the / lithium compound ratio and reaction temperature were changed as shown in Table 1. Measure the recovered amount and BET specific surface area of ​​the obtained unprocessed lithium-containing silicon oxide powder; measure the average particle diameter D of the refined lithium-containing silicon oxide powder 50 , BET specific surface area, lithium content and oxygen content. These results are listed in Table 2 together with the compositions (values ​​of x and y in the general formula) calculated from the lithium and oxygen contents. The presence or absence of amorphous lithium silicon oxide and crystallized lithium silicon oxide was checked by x-ray diffraction measurement. The results are shown in Table 2. figure 2 and 3 These are the X-ray diffraction patterns of the (lithium-containing silicon oxid...

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Abstract

A lithium ion secondary cell having a high capacity, improved first charge / discharge efficiency and improved cycle performance is obtainable using as the negative electrode material a lithium-containing silicon oxide powder having the formula: SiLixOy wherein x and y are 0 < x < 1.0 and 0 < y < 1.5, with the lithium being fused and partially crystallized.

Description

technical field [0001] The present invention relates to a lithium-containing silicon oxide powder that can be used as a negative electrode active material in a lithium-ion secondary battery, and a method for producing the lithium-containing silicon oxide powder. 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 oxides of V.Si, B, Zr, Sn or composite oxides thereof (JP5-174818A, JP6-60867A corresponding to USP5478671), Melting and quenching metal oxide (JP10-294112A), silicon oxide (Japanese patent 2997741 corresponding to USP5395711), and Si 2 N 2 O or Ge 2 N 2 O (corresponding to JP11-102705 of USP6066414) is used as the negative electrode material. [0003] These known methods are successful in incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/32C01B33/113H01M4/485H01M4/58H01M10/05
CPCH01M2004/027Y02E60/122C01B33/113H01M10/052H01M2004/021H01M4/485H01M4/131Y02E60/10H01M4/48H01M4/04
Inventor 福冈宏文宫胁悟荒又干夫上野进籾井一磨福田健
Owner SHIN ETSU CHEM IND CO LTD
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