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Negative electrode active material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery using the negative electrode active material

一种负极活性物质、非水电解质的技术，应用在非水电解质二次电池领域，能够解决初次充放电效率容量降低等问题，达到初次充放电效率和循环特性提高的效果

Active Publication Date: 2017-09-01
PANASONIC ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, using SiO X The non-aqueous electrolyte secondary battery in which silicon oxide is used as the negative electrode active material has the problem that the initial charge and discharge efficiency and the capacity at the beginning of the cycle are significantly reduced compared with the case of using only graphite as the negative electrode active material.

Method used

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  • Negative electrode active material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery using the negative electrode active material
  • Negative electrode active material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery using the negative electrode active material
  • Negative electrode active material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery using the negative electrode active material

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Embodiment

[0050] Hereinafter, the present invention will be described in more detail through specific examples. However, the present invention is not limited by the following examples, and can be implemented with appropriate changes within the scope of not changing its gist.

Embodiment 1

[0053] [Production of Negative Electrode]

[0054] Preparation of SiO surface covered with carbon X (X=0.93, average primary particle diameter: 5.0 μm). It should be noted that the coating was carried out using the CVD method. In addition, the carbon relative to the SiO X The ratio is 10% by mass, SiO X The carbon coverage of the surface was set at 100%. 1 mole of the above SiO X , 0.2 mol of LiOH mixed in powder state (LiOH relative to SiO X The ratio is 20 mol%), in SiO X LiOH is attached to the surface. Then, it was heat-treated at 800°C for 10 hours in an Ar atmosphere to produce SiO with a lithium silicate phase formed inside. X . The heat-treated SiO X Analyzed by XRD (ray source is CuKα), the results are as follows figure 1 As shown, it was confirmed that Li as lithium silicate 4 SiO 4 and Li 2 SiO 3 peak. In addition, the number of moles of lithium silicate phase relative to SiO X The total number of moles (hereinafter referred to as SiO X The ratio o...

Embodiment 2

[0063] Lithium source and SiO X When mixing for heat treatment, use Li 2 CO 3 (Li 2 CO 3 relative to SiO X A battery was produced in the same manner as in Example 1 of the above-mentioned first example, except that LiOH was used as the lithium source instead of LiOH at a ratio of 10 mol%. It should be noted that the heat-treated SiO by XRD X As a result of analysis, it was confirmed that Li as lithium silicate 4 SiO 4 and Li 2 SiO 3 peak. In addition, SiO after heat treatment X The ratio of the lithium silicate phase in is 5 mol%. The battery produced in this way is hereinafter referred to as battery A2.

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Abstract

An object of the present invention is to improve the initial charge-discharge efficiency and cycle characteristics of a non-aqueous electrolyte secondary battery using SiOX as a negative electrode active material. Provided is a negative electrode active material comprising particles made of SiOX containing a lithium silicate phase inside, and the surfaces of the particles made of SiOX are covered with carbon by 50% or more and 100% or less. In addition, the ratio of the number of moles of the lithium silicate phase to the total molar amount of the particles composed of the SiOX is 5 mol % or more and 25 mol % or less, and the average primary particle diameter of the particles composed of the SiOX is 1 μm or more and 15μm or less.

Description

technical field [0001] The present invention relates to a negative electrode active material for a nonaqueous electrolyte secondary battery and a nonaqueous electrolyte secondary battery using the negative electrode active material. Background technique [0002] Due to SiO X The silicon oxide shown has a high specific capacity and a smaller volume expansion coefficient when absorbing lithium during charging than Si, so it has been studied as a negative electrode active material mixed with graphite (see Patent Document 1). [0003] However, using SiO X The non-aqueous electrolyte secondary battery in which silicon oxide is used as the negative electrode active material shown has the problem that the initial charge and discharge efficiency and the capacity at the initial stage of the cycle are significantly lower than the case of using only graphite as the negative electrode active material. [0004] In order to improve the initial charge and discharge efficiency, composite ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/36H01M4/525H01M4/587H01M10/052
CPCH01M4/134H01M4/366H01M4/483H01M10/052H01M2004/021H01M4/133H01M4/625H01M4/5825Y02E60/10H01M4/525H01M4/587H01M10/0525H01M2004/027
Inventor 南博之井町直希
Owner PANASONIC ENERGY CO LTD
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