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Silicon oxide and negative-electrode material for a lithium-ion secondary battery

一种硅氧化物、二次电池的技术，应用在二次电池、电池电极、非水电解质蓄电池电极等方向，能够解决循环特性达不到实用程度等问题，达到优良循环特性、优良初期效率、高容量的效果

Active Publication Date: 2012-05-16
OSAKA TITANIUM TECHNOLOGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the charge-discharge capacity decreases to about 80% of the initial value after 10 charge-discharge cycles, and there is a problem that the cycle characteristics are not practical.
In addition, regarding the example of silicon oxide, there is no description in Patent Document 7

Method used

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  • Silicon oxide and negative-electrode material for a lithium-ion secondary battery
  • Silicon oxide and negative-electrode material for a lithium-ion secondary battery
  • Silicon oxide and negative-electrode material for a lithium-ion secondary battery

Examples

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Embodiment Construction

[0052] The silicon oxide of the present invention and a negative electrode material for a non-aqueous electrolyte secondary battery using the same will be described.

[0053] 1. About lithium-ion secondary batteries

[0054] image 3 It is a diagram showing a configuration example of a button-shaped lithium ion secondary battery using the silicon oxide of the present invention and the negative electrode material for lithium ion secondary batteries. As shown in the figure, a lithium ion secondary battery 10 is composed of a positive electrode 11 , a negative electrode 13 containing a negative electrode active material capable of absorbing and releasing lithium ions, a lithium ion conductive non-aqueous electrolyte solution, and a separator 15 . Instead of the non-aqueous electrolyte, a polymer electrolyte may also be used.

[0055] The positive electrode 11 is composed of a counter electrode container 11a, a counter electrode current collector 11b, and a counter electrode 11c...

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Abstract

Provided is a silicon oxide used in a negative-electrode active material for a lithium-ion secondary battery. Said silicon oxide is characterized by a g-value of at least 2.0020 and no more than 2.0050, measured by an ESR spectrometer, and is further characterized in that A / B is at least 0.5 and C / B is no more than 2, where A, B, and C are the integrated intensities of peaks near 420 cm-1, 490 cm-1, and 520 cm-1 respectively, in a Raman spectrum measured by a Raman spectrometer. Using this silicon oxide as a negative-electrode active material allows a high-capacity lithium-ion secondary battery having excellent cycle characteristics and initial efficiency. The silicon oxide preferably has a spin density of at least 1 1017 spins / g and no more than 5 1019 spins / g. Also provided is a negative-electrode material for a lithium-ion secondary battery, said negative-electrode material containing at least 20% by mass of the silicon oxide as a negative-electrode active material.

Description

technical field [0001] The present invention relates to a silicon oxide that can be used as a negative electrode active material of a lithium ion secondary battery having a high capacity and excellent cycle characteristics and initial efficiency, and a negative electrode material for a lithium ion secondary battery using the silicon oxide. Background technique [0002] In recent years, with the remarkable development of mobile electronic equipment, communication equipment, etc., the development of secondary batteries with high energy density is strongly required from the viewpoint of economy, miniaturization and weight reduction of equipment. At present, there are nickel-cadmium batteries, nickel-hydrogen batteries, lithium-ion secondary batteries, polymer batteries, and the like as high-energy-density secondary batteries. Among them, lithium-ion secondary batteries, compared with nickel-cadmium batteries and nickel-metal hydride batteries, have significantly longer life and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48C01B33/113H01M4/13
CPCY02E60/122C01B33/113H01M4/134H01M4/485H01M4/0423H01M10/0525Y02E60/10H01M4/48
Inventor 木崎信吾
Owner OSAKA TITANIUM TECHNOLOGIES
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