Kabushiki Kaisha Toyota Jidoshokki

National Institute of Advanced Industrial Science and Technology

Yuya Sato

Masakazu Murase

Tetsuo Sakai

Nobuhiro Goda

Manabu Miyoshi

Mitsuharu Tabuchi

Junichi Niwa

Masataka Nakanishi

Kazuhito Kawasumi

Toshikatsu Kojima

Hiroki Oshima

Masanori Morishita

Akira Kojima

Tomokuni Abe

Takuhiro Miyuki

Kisena Yoshida

Provided is a negative electrode for a nonaqueous secondary battery which achieves both suppression of reductive decomposition of an electrolyte or an electrolytic solution and suppression of an increase in resistance. Also provided are a method for producing such a negative electrode and a nonaqueous secondary battery employing such a negative electrode. A polymer coating layer is formed so as to coat at least part of surfaces of negative electrode active material particles containing silicon oxide (SiO; 0.5&#x2266;x&#x2266;1.6). The polymer coating layer contains a cationic polymer having a positive zeta potential under neutral conditions. Since silicon oxide has a negative zeta potential, a thin uniform coating layer can be formed owing to Coulomb's force.

Negative electrode for nonaqueous secondary battery, method for producing the same, and nonaqueous secondary battery

Provided is a novel lithium silicate-based material useful as a positive electrode material for lithium ion secondary battery. The lithium silicate-based compound is represented by LiFeSiO. The lithium silicate-based compound is a compound including: lithium (Li); iron (Fe); silicon (Si); and oxygen (O), and expressed by a composition formula, LiFeSiO(&#x2212;0.25&#x2266;&#x3b4;&#x2266;0.25, 0&#x2266;c&#x2266;0.5). The lithium silicate-based compound, of which iron (Fe) is trivalent, exerts a remarkable chemical stability as compared to LiFeSiO.

Lithium silicate-based compound, positive electrode active material for lithium ion secondary battery, and lithium ion secondary battery using the same

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Kariya, Japan

Yuya Sato