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Negative electrode active material and manufacturing method therefor, and negative electrode using negative electrode active material, and non-aqueous electrolyte secondary battery

A negative electrode active material and non-aqueous electrolyte technology, which is applied in the negative electrode active material of lithium-ion secondary batteries and its manufacturing field, can solve the problems of poor initial efficiency, achieve high capacity, suppress volume expansion, and excellent cycle characteristics

Inactive Publication Date: 2016-05-18
FURUKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since a Cu alloy that is easily oxidized is used, there is a problem that CuO is generated and the initial efficiency is poor.

Method used

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  • Negative electrode active material and manufacturing method therefor, and negative electrode using negative electrode active material, and non-aqueous electrolyte secondary battery
  • Negative electrode active material and manufacturing method therefor, and negative electrode using negative electrode active material, and non-aqueous electrolyte secondary battery
  • Negative electrode active material and manufacturing method therefor, and negative electrode using negative electrode active material, and non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0186] (Production of negative electrode active material)

[0187] The granular raw materials of silicon, vanadium, iron and aluminum are mixed in a weight ratio of Si:V:Fe:Al=62:7:12:19, and a vacuum arc melting device (NEV- AD03) Make master alloy. Thereafter, the alloy crushed to a size of about 5 mm was put into a crucible in a liquid quenching solidification device (NEV-A1 manufactured by Nisshin Giken Co., Ltd.), heated to 1650° C. with a high-frequency coil to melt it, and then Melt utilization Figure 5 The single-roll quenching device made of copper is quenched by the single-roll quenching device shown, thereby obtaining a flake-shaped negative electrode active material. Vanadium corresponds to the element M. Vanadium and silicon form VSi 2 Form the first silicide, iron and silicon and aluminum to form FeAl 3 Si 2 A second silicide is formed. Aluminum was excessively added to the composition of Example 1, so a metal-like aluminum phase that does not form silici...

Embodiment 11

[0207] (Production of negative electrode active material)

[0208] Ingots of silicon, vanadium, iron, and aluminum were mixed in an atomic ratio of Si:V:Fe:Al=66:3:4:27, and a vacuum arc melting device (NEV-AD03 manufactured by Nisshin Giken Co., Ltd. ) to make master alloys. Thereafter, the alloy crushed to a particle size of about 5 mm was put into a crucible in a liquid quenching solidification device (NEV-A1 manufactured by Nisshin Giken Co., Ltd.), heated to 1650° C. with a high-frequency coil to melt it, and then The melt was quenched by a copper single roll of a single roll quenching device to a temperature (below 1000° C.) at which a second phase having Li conductivity was precipitated, thereby obtaining a flake-shaped negative electrode active material. In this embodiment, vanadium corresponds to element D. Vanadium and silicon make VSi equivalent to the third phase 2 , making iron, silicon and aluminum equivalent to the second phase of FeAl 3 Si 2 . Aluminum wa...

Embodiment 12～19

[0218] As shown in Table 1, the same manufacturing method and evaluation method as in Example 1 were adopted except that the composition and the composition ratio were changed.

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Abstract

Provided is a negative electrode active material characterized by a composition that includes silicon and an element (M) that can form a compound with silicon, and that first precipitates out a compound of silicon and the element (M) when the composition of silicon and the element (M) is cooled from a molten state, and then precipitates out pure silicon or solid-solution silicon when cooled further. The negative electrode active material is characterized, electrochemically, by a first phase having Li occlusion properties being dispersed in a second phase having Li conductivity properties, and the first phase further including a third phase with weaker Li occlusion properties than the first phase.

Description

technical field [0001] The present invention relates to an anode active material used in an anode for a nonaqueous electrolyte secondary battery and a method for producing the same, specifically, an anode active material for a lithium ion secondary battery excellent in high capacity, cycle characteristics, and capacity retention and manufacturing methods thereof. Background technique [0002] So far, non-aqueous electrolyte secondary batteries using various carbon-based materials such as natural graphite, artificial graphite, amorphous carbon, and mesophase carbon as negative electrode active materials have been put into practical use. However, the theoretical capacity of graphite is as low as 372 mAh / g, and there is a limit to further increasing the capacity. [0003] On the other hand, with the aim of increasing the capacity, metals and alloys having a large theoretical capacity as lithium compounds, especially silicon and alloys thereof, have been developed as negative e...

Claims

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Application Information

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IPC IPC(8): H01M4/38B22F9/04B22F9/08C22C28/00C22C30/00H01M4/36H01M4/48
CPCB22F9/082H01M4/364H01M4/38H01M4/386H01M4/485H01M4/58H01M10/052Y02E60/10C22C28/00C22C30/00
Inventor 西村健松下雅西久保英郎樋上俊哉打越昭成小见川祐中村健一佐佐木宏和山崎悟志
Owner FURUKAWA ELECTRIC CO LTD
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