Kabushiki Kaisha Toyota Jidoshokki

Tomohiro Niimi

Yusuke Sugiyama

Masataka Nakanishi

Masakazu Murase

Nobuhiro Goda

Takeshi Kondo

Kazuhito Kawasumi

Yoshihiro Nakagaki

Hiroshi Hirate

Mutsumi Takahashi

Shigenori Koishi

Takahiro Sugioka

Hiroki Oshima

Takashi Mohri

Yuta Kawamoto

Takashi Mori

Hirotaka Sone

Nagisa Watanabe

Cycle characteristics of a nonaqueous secondary battery are to be improved. An active material including: a first active material that contains a nano silicon produced by heating a layered polysilane represented by a composition formula (SiH)and having a structure in which multiple six-membered rings formed from silicon atoms are connected; and a second active material that contains a graphite, is used in a negative electrode. With this, expansion and contraction due to stress during charging and discharging can be mitigated, and thereby cycle characteristics improve.

Negative electrode for nonaqueous secondary battery and nonaqueous secondary battery, negative electrode active material and method for producing same, complex including nano silicon, carbon layer, and cationic polymer layer, and method for producing complex formed of nano silicon and carbon layer

Provided is a negative electrode active material including complex particles formed of: nano silicon aggregated particles produced by heating a layered polysilane represented by a composition formula of (SiH)and having a structure in which multiple six-membered rings formed from silicon atoms are connected; and a composited carbon layer formed from an amorphous carbon and at least covering one portion of the aggregated particles. A mean particle diameter Dof the aggregated particles is within a range of 0.2 &#x3bc;m to 30 &#x3bc;m, and a mean particle diameter Dof the complex particles is within a range of 0.5 &#x3bc;m to 40 &#x3bc;m.

Negative electrode active material, method for producing same, and electrical storage device

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); 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.'

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

Providing a negative-electrode material for nonaqueous-electrolyte secondary battery, the negative-electrode material including lithium silicate particles coated by a carbonaceous substance, a production process for the same, a negative electrode for nonaqueous-electrolyte secondary battery, and a nonaqueous-electrolyte secondary battery. A negative-electrode material for nonaqueous-electrolyte secondary battery includes lithium silicate particles having a surface at least some of which is coated by a carbonaceous substance formed by heating a carbon-containing compound at a thermal decomposition temperature of the carbon-containing compound or more and 1,100&#xb1;&#xb0; C. or less, the carbon-containing compound being a solid at ordinary temperature and exhibiting a zeta-potential absolute value being 60 or more against N-methyl-2-pyrrolidone (or NMP).

Negative-electrode material for nonaqueous-electrolyte secondary battery production process for the same, negative electrode for nonaqueous-electrolyte secondary battery, and nonaqueous-electrolyte secondary battery

A nanometer-size silicon material produced by heat treating a lamellar polysilane exhibits Raman-shift peaks existing at 341&#xb1;10 cm, 360&#xb1;10 cm, 498&#xb1;10 cm, 638&#xb1;10 cm, and 734&#xb1;10 cmin a Raman spectrum, has a large specific surface area, and has a reduced SiO content.

Production process for nanometer-size silicon material

Providing a negative-electrode active material for nonaqueous-electrolyte secondary battery, the negative-electrode active material enabling an output characteristic to upgrade, a production process for the same, a negative electrode for nonaqueous-electrolyte secondary battery, and a nonaqueous-electrolyte secondary battery. The negative-electrode active material includes an Si-metal-carbon composite composed of: a metal/carbon composite matrix including at least one metal selected from the group consisting of Cu, Fe, Ni, Ti, Nb, Zn, In and Sn, at least one member selected from the group consisting of N, O, P and S, and amorphous carbon; and nanometer-size Si particles dispersed in the metal/carbon composite matrix.

Negative-electrode active material for nonaqueous-electrolyte secondary battery production process for the same, negative electrode for nonaqueous-electrolyte secondary battery, and nonaqueous-electrolyte secondary battery

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Kariya, Japan

Tomohiro Niimi