Panasonic Intellectual Property Management Co., Ltd.

Kazuro Hayashida

Yohei Uchiyama

Tatsuya Akira

Norihisa Yamamoto

Daisuke Katou

Negative electrode active material particles comprise base particles having: a silicate phase containing LiO, SiO, at least one oxide selected from MO, MO, MO, and MO(where M, M, M, and Mare elements other than alkali metals, alkali earth metals, and Si), and a discretionary component MO (where M is an alkali earth metal); and silicon particles dispersed in the silicate phase. The element contents for the elements contained in the silicate phase are: 3-33 mol % of Li; 40-78 mol % of S; and 1-40 mol % of M, M, M, and M. If MO is contained, the M content in the silicate phase is 1-10 mol %.

Negative electrode active material for non-aqueous electrolyte secondary cell, and non-aqueous electrolyte secondary cell

Negative electrode active material particles according to the present invention have composite particles that include: a sodium silicate phase with a Vickers hardness of 150 Hv or greater, and silicon particles dispersed in the sodium silicate phase.

Negative electrode active material for lithium ion battery, and lithium ion battery

A negative electrode material for a non-aqueous electrolyte secondary battery includes: a lithium silicate phase including lithium silicate particles; silicon particles dispersed in the lithium silicate phase; and a low-melting point inorganic oxide that has a lower melting point than lithium silicate forming the lithium silicate particles, and that is solid at room temperature. The lithium silicate particles and the silicon particles form a particle agglomerate, and the low-melting point inorganic oxide is filled in at least a portion of voids included in the particle agglomerate.

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Osaka, Japan

Kazuro Hayashida