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Negative electrode material, negative electrode active material, non-aqueous electrolyte secondary battery and battery pack

A negative electrode active material, non-aqueous electrolyte technology, applied in non-aqueous electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problems of reduced charge and discharge efficiency, inability to greatly change the ratio of silicon to silicon oxide, and reduced capacity

Inactive Publication Date: 2014-01-15
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if such an active material is subjected to hundreds of charge-discharge cycles, the capacity will decrease and the life characteristics will be insufficient for long-term use.
[0005] Furthermore, a detailed investigation into the cause of the decrease in the charge-discharge efficiency revealed that the silicon oxide contained in the active material reacts irreversibly with lithium, which is the main cause of the decrease in the charge-discharge efficiency of the initial charge-discharge.
However, as mentioned above, when silicon monoxide is used as a raw material, the raw material is SiO X (x=1), there is a problem that the ratio of silicon to silicon oxide cannot be greatly changed

Method used

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  • Negative electrode material, negative electrode active material, non-aqueous electrolyte secondary battery and battery pack
  • Negative electrode material, negative electrode active material, non-aqueous electrolyte secondary battery and battery pack
  • Negative electrode material, negative electrode active material, non-aqueous electrolyte secondary battery and battery pack

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no. 1 Embodiment approach ）

[0029] The negative electrode material according to the embodiment includes silicon that performs intercalation and deintercalation of Li, which can be used in the negative electrode active material of the non-aqueous electrolyte secondary battery. Such as figure 1 As shown in the conceptual diagram of , the negative electrode material 100 of the first embodiment is composed of crystalline silicon 101 and silicon oxide 102 covering the crystalline silicon 101, which has the composition formula SiO x express.

[0030] The crystalline silicon 101 of the negative electrode material 100 is covered with silicon oxide 102 . Thereby, there are advantages such as preventing the grain growth of silicon 101 and improving the cycle characteristics of silicon. Silicon 101 in a form in which a part of silicon 101 is not covered with silicon oxide 102 may be contained in the negative electrode material 100 in an amount of 10% or less, for example.

[0031] If the composition formula SiO ...

no. 2 Embodiment approach ）

[0041] Such as Figure 4 As shown in the conceptual diagram of , the negative electrode active material 200 of the second embodiment includes a carbonaceous material 201 and the negative electrode material 100 in the carbonaceous material 201 . The negative electrode material 100 is dispersed in the carbonaceous material 201 .

[0042] The negative electrode active material 200 is a particle containing the negative electrode material 100 described in the first embodiment for intercalating and deintercalating Li. The average primary particle size of the negative electrode active material 200 is preferably not less than 1 μm and not more than 80 μm. The average primary particle size of the negative electrode active material 200 is more preferably not less than 10 μm and not more than 60 μm. The particle size of the active material affects the speed of lithium intercalation and deintercalation reactions and greatly affects the characteristics of the negative electrode. However,...

no. 3 Embodiment approach ）

[0068] The non-aqueous electrolyte secondary battery according to the third embodiment will be described.

[0069] The non-aqueous electrolyte secondary battery according to the third embodiment includes: an outer packaging material; a positive electrode housed in the outer packaging material; and an active material is contained in the outer packaging material in a manner that is spaced apart from the positive electrode, for example, with a separator interposed therebetween. The negative electrode; and the non-aqueous electrolyte filled in the outer packaging material.

[0070] Refer to the table showing an example of the non-aqueous electrolyte secondary battery 300 according to the embodiment. Figure 5 , Figure 6 A conceptual diagram of , explained in more detail. Figure 5 It is a cross-sectional conceptual diagram of a flat non-aqueous electrolyte secondary battery 300 in which a bag-shaped outer packaging material 302 is formed of a laminated film, Figure 6 yes Fi...

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Abstract

The invention provides a long-life negative electrode material for a non-aqueous electrolyte secondary battery, a negative electrode active material for non-aqueous electrolyte secondary battery, a non-aqueous electrolyte secondary battery and a battery pack. There is provided a negative electrode material for non-aqueous electrolyte secondary batteries, the negative electrode material being a silicon oxide represented by the composition formula, SiOx, containing silicon and silicon oxide, in which x satisfies the relation of 0.1<=x<=0.8; the silicon oxide contains crystalline silicon; among the particles of crystalline silicon having a diameter of 1 nm or greater, the proportion by number of particles having a diameter of 100 nm or less is 90% or greater; and the BET specific surface area of the silicon oxide is larger than 100 m2 / g.

Description

technical field [0001] Embodiments of the present invention relate to a negative electrode material for a nonaqueous electrolyte secondary battery, a negative electrode active material for a nonaqueous electrolyte secondary battery, a negative electrode for a nonaqueous electrolyte secondary battery, a nonaqueous electrolyte secondary battery, and a battery pack. Background technique [0002] In recent years, due to the rapid development of miniaturization technology of electronic devices, various portable electronic devices are becoming popular. In addition, miniaturization is also required for batteries serving as power sources of these portable electronic devices, and nonaqueous electrolyte secondary batteries having high energy density are attracting attention. [0003] In particular, attempts have been made to use elements that alloy with lithium, such as silicon and tin, and substances that have a large lithium intercalation capacity and a high density, such as amorpho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M4/134H01M10/0525
CPCH01M4/131H01M4/48H01M10/052H01M4/0471H01M4/134H01M4/366H01M4/625H01M2004/021Y02E60/10H01M4/133
Inventor 越崎健司深泽孝幸森田朋和长田宪和堀田康之久保木贵志平冈俊郎
Owner KK TOSHIBA