Negative-electrode active material, production process for the same and electric storage apparatus

Patent metadata

Field	Value
Publication number	US-10230100-B2
Application number	US-201314761999-A
Country	US
Kind code	B2
Filing date	Dec 25, 2013
Priority date	Feb 22, 2013
Publication date	Mar 12, 2019
Grant date	Mar 12, 2019

Abstract

A negative-electrode active material is used for a negative electrode, the negative-electrode active material including: agglomerated particles including nanometer-size silicon produced by heat treating a lamellar polysilane having a structure in which multiple six-membered rings constituted of a silicon atom are disposed one after another, and expressed by a compositional formula, (SiH) n ; and a carbon layer including amorphous carbon, and covering at least some of the agglomerated particles to be composited therewith. An electric storage apparatus including the same is not only able to reduce the irreversible capacity, but also able to inhibit the generation of “SEI.”

First claim

The invention claimed is:

1. A production process for negative-electrode active material, the production process comprising the following steps carried out in the following order:
an agglomerated-particles forming step of obtaining nanometer-size silicon agglomerated particles by heat treating a lamellar polysilane having a structure in which multiple six-membered rings constituted of a silicon atom are disposed one after another, and expressed by a compositional formula, (SiH)n; and
a carbonizing step of mixing the agglomerated particles with a resinous solution comprising a resin and a solvent, then removing the solvent, and thereafter carbonizing the resin;
whereby forming a composite comprising the agglomerated particles, and a carbon layer including amorphous carbon and covering at least some of the agglomerated particles to be composited therewith,
wherein said carbonizing step is carried out after mixing said agglomerated particles and an organometallic complex comprising at least one metal selected from the group consisting of transition metals with said resinous solution and then removing the solvent therefrom.

2. The production process for negative-electrode active material as set forth in claim 1 , wherein said resin comprises a phenolic resin.

3. The production process for negative-electrode active material as set forth in claim 1 , wherein said carbonizing step is a step of heating carried out at from 600° C. to 1,000° C.

4. The production process for negative-electrode active material as set forth in claim 1 , wherein said carbonizing step is carried out after mixing said agglomerated particles and an electrically-conducting powder with said resinous solution and then removing the solvent therefrom.

Assignees

• Toyota Jidoshokki Kk

Inventors

• Sugiyama Yusuke
• Nakanishi Masataka
• Goda Nobuhiro
• Niimi Tomohiro
• Murase Masakazu
• Kondo Takeshi
• Koishi Shigenori
• Hirate Hiroshi
• Nakagaki Yoshihiro
• Takahashi Mutsumi

Classifications

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• C01B33/18

  Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof (preparation of aerogels by dehydrating gels C01B33/158; treatment to enhance the pigmenting or filling properties C09C) · CPC title

• H01M4/366 Primary

  as layered products · CPC title