Composite negative-electrode active material, process for producing the same and nonaqueous-electrolyte secondary battery

A negative electrode active material, non-aqueous electrolyte technology, used in non-aqueous electrolyte batteries, non-aqueous electrolyte battery electrodes, secondary batteries, etc. Effect of charge/discharge cycle characteristics

Inactive Publication Date: 2007-08-01
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, active materials including simple substances, oxides, or alloys such as Si, Sn, and Ge have very low electron conductivity, and thus cannot be practically used due to increased battery internal resistance unless these active materials are mixed with conductive materials

Method used

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  • Composite negative-electrode active material, process for producing the same and nonaqueous-electrolyte secondary battery
  • Composite negative-electrode active material, process for producing the same and nonaqueous-electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] 1 g of iron nitrate nonahydrate (special grade) manufactured by Kanto Chemical Co., Inc. was dissolved in 100 g of ion-exchanged water (below, the same iron nitrate nonahydrate was used). The solution thus obtained was mixed with silicon oxide (SiO) manufactured by Kojundo Chemical Laboratory Co., Ltd. which was pulverized into a particle diameter of 10 µm or less. The SiO used here was analyzed according to the gravimetric method (JIS Z2613 method), and as a result, the molar ratio of O / Si was found to be 1.01. The mixture of the silica particles and the solution was stirred for 1 hour, and then water was removed by an evaporator, so that the silica particles supported ferric nitrate on their surfaces.

[0101] The ferric nitrate-loaded silica particles were placed in a ceramic reaction vessel, and the temperature was raised to 500 °C in the presence of helium. Then, the helium gas was replaced with a mixed gas composed of 50% by volume of hydrogen gas and 50% by volu...

Embodiment 2

[0105] The same operation as in Example 1 was carried out, except that 1 g of nickel nitrate hexahydrate (special grade) manufactured by Kanto Chemical Co., Inc. was dissolved in 100 g of ion-exchanged water (below, the same nickel nitrate hexahydrate was used) instead of 1 g Iron nitrate nonahydrate. As a result, a composite negative electrode active material B composed of silicon oxide particles having herringbone-shaped carbon nanofibers grown on its surface was obtained.

[0106] The particle size of the nickel particles supported on the silica particles was substantially the same as that of the iron particles in Example 1. The fiber diameter, fiber length and weight ratio of the grown carbon nanofibers to the silicon oxide particles are basically the same as those in Example 1. SEM observation confirmed the presence of thin fibers with a diameter of 30 nm or less in addition to fibers with a diameter of about 80 nm. The grain size of SiC is also the same as in Example 1...

Embodiment 3

[0108] The same operation as in Example 1 was performed except that 0.5 g of iron nitrate nonahydrate and 0.5 g of nickel nitrate hexahydrate were dissolved in 100 g of ion-exchanged water instead of 1 g of iron nitrate nonahydrate. As a result, a composite negative electrode active material C having silicon oxide particles of folded carbon nanofibers grown on its surface was obtained.

[0109] The particle diameters of the iron particles and the nickel particles supported on the silica particles were substantially the same as those of the iron particles in Example 1. The fiber diameter, fiber length and weight ratio of the grown carbon nanofibers to the active material particles were substantially the same as those in Example 1. SEM observation confirmed the presence of thin fibers with a diameter of 30 nm or less in addition to fibers with a diameter of about 80 nm. The grain size of SiC is also the same as in Example 1.

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Abstract

A composite negative-electrode active material, comprising grains of silicon oxide of the formula SiOx (0.05 H01M 4 / 48 B01J 23 / 74 H01M 4 / 58 H01M 10 / 40 C01B 31 / 02 H01M 4 / 02 2 30 3 2005 / 8 / 23 101010820 2007 / 8 / 1 000000000 Matsushita Electric Ind Co., Ltd. Japan Ishida Sumihito Matsuda Hiroaki Yoshizawa Hiroshi yuhui 72002 NTD Patent & Trademark Agency Ltd. Units 1805-6, 18th Floor, Greenfield Tower, Concordia Plaza, No.1 Science Museum Road, Tsimshatsui, east, Kowloon, Hong Kong 100045 Japan 2004 / 12 / 22 371255 / 2004 2007 / 2 / 26 PCT / JP2005 / 015266 2005 / 8 / 23 WO2006 / 067891 2006 / 6 / 29 Japanese

Description

technical field [0001] The present invention relates to a composite negative electrode active material comprising SiO capable of charging and discharging lithium x The improved silicon oxide particles represented by (0.05<x<1.95) specifically relate to a composite negative active material comprising silicon oxide particles and carbon nanometers bonded to the surface of the silicon oxide particles fiber. Furthermore, the present invention also relates to a nonaqueous electrolyte secondary battery having excellent cycle characteristics and high reliability. Background technique [0002] As electronic devices become increasingly portable and wireless, expectations for non-aqueous electrolyte secondary batteries that are small in size, light in weight, and high in energy density are growing. Currently, carbon materials such as graphite are used as negative electrode active materials for non-aqueous electrolyte secondary batteries in practical applications. In theory, gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48B01J23/74H01M4/58H01M10/40C01B31/02H01M4/02H01M4/13H01M4/131H01M4/133H01M4/485H01M4/52H01M4/525H01M4/587H01M10/0525H01M10/36
CPCH01M4/133B01J21/185B01J23/38B01J21/08H01M4/131H01M4/525H01M4/587H01M4/485H01M10/0525Y02E60/122H01M4/625H01M4/13B01J23/70B82Y30/00Y02E60/10H01M4/48H01M4/38H01M10/052
Inventor 石田澄人松田博明芳泽浩司
Owner PANASONIC CORP
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