Si-based eutectic alloy for negative electrode active material of electric storage device and manufacturing method thereof

Abstract

An Si-based alloy negative electrode material and an electrode are provided, the negative electrode material being capable of giving excellent battery characteristics because the negative electrode material has a microfined structure, has a controlled composition system whereby ionic conductivity, electronic conductivity, and an enhancing stress relaxation effect are heightened, and comprises an Si phase and an intermetallic-compound phase which have regulated crystallite sizes. This negative electrode material, which is for storage devices that involve the movement of lithium ions when charged / discharged, comprises an Si-based alloy. The negative electrode material comprising an Si-based alloy includes a main Si phase constituted of Si and a compound phase comprising Si and one or more other elements. The compound phase comprises a phase constituted of Si and Cr or of Si, Cr, and Ti. The main Si phase has an Si crystallite size of 30 nm or less, and the compound phase constituted of Si and Cr or of Si, Cr, and Ti has a crystallite size of 40 nm or less.

Description

[0001] This application claims priority based on Japanese Patent Application No. 2013-29846 filed on February 19, 2013 and Japanese Patent Application No. 2013-170145 filed on August 20, 2013, and all of these are incorporated into this specification by reference Public content. Technical field [0002] The present invention relates to a lithium ion secondary battery, a hybrid capacitor, an all-solid lithium ion secondary battery, and other lithium ion secondary batteries, such as a lithium ion secondary battery that accompanies the movement of lithium ions during charge and discharge. System eutectic alloy and its manufacturing method. Background technique [0003] In recent years, with the popularization of portable devices, the development of high-performance secondary batteries centered on lithium-ion batteries has been developed. Furthermore, as a stationary storage device for automobiles or households, the development of hybrid capacitors in which lithium ion secondary batt...

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Problems solved by technology

[0016] Therefore, the problem to be solved by the present invention is to control the chemical composition, structure, and size of the Si phase and the intermetallic compound phase in the Si-based alloy to a high degree, thereby aiming at lithium-ion secondary batteries, hybrid capacitors, all-solid Propose a Si-based alloy negative electrode material with excellent charge and discharge characteristics for electric storage devices such as batteries that move lithium ions during charge and discharge

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