Panasonic Intellectual Property Management Co., Ltd.

Sanyo Electric Co., Ltd.

Norihisa Yamamoto

Yohei Uchiyama

Tatsuya Akira

Hiroshi Minami

Taisuke Yamamoto

Kazuro Hayashida

Keita Okazaki

Taizou Sunano

Yoshio Kato

Taisuke Asano

In the present invention, negative electrode active material particles for a nonaqueous electrolyte secondary battery which can suppress decrease of charging and discharging cycle characteristics, are each provided with: a composite particle that includes a silicate phase and silicon particles dispersed in the silicate phase; and a surface layer that covers the composite particle, wherein the surface layer includes a fluorine resin.

Negative electrode active material for nonaqueous electrolyte secondary battery, negative electrode, and nonaqueous electrolyte secondary battery

A negative electrode active material for a secondary battery includes silicate composite particles each of which contain a silicate phase and silicon particles dispersed in the silicate phase, the silicate phase is an oxide phase containing Si, O, and alkali metals, the alkali metals include at least Na and Li, and an atomic ratio: Na/Li of Na to Li is 0.1 to 7.1.

Negative electrode active material for secondary batteries and secondary battery

This negative electrode active material for a secondary cell which is one aspect of the present disclosure comprises: a silicate phase that contains Li, Si, and M(Malkali metal, alkaline earth metal, and an element other than Si); silicon particles dispersed in the silicate phase; and oxide particles that contain Zr dispersed in the silicate phase. The content of each element with respect to the total of the elements other than oxygen in the silicate phase is 3 to 45 mol % for Li, 40 to 78 mol % for Si, and 1 to 40 mol % for M.

Negative electrode active material for secondary cell, and secondary cell

A negative electrode active material for non-aqueous electrolyte secondary batteries, including: lithium silicate composite particles including a lithium silicate phase and silicon particles dispersed in the lithium silicate phase, the lithium silicate phase being an oxide phase including Li, Si, O, and M, where M is an element other than the following elements: Group 1 elements of alkali metals, Group 16 elements of oxygen group, Group 18 elements of rare gas, and Si. An amount of each element relative to a total amount of Li, Si and M in the lithium silicate phase is 3 to 55 mol % for Li, 25 mol % or more for Si, and 3 to 50 mol % for M. A carbon material is present inside the lithium silicate composite particles; and an area ratio of the carbon material occupying a cross section of the composite particles is 0.008 to 6%.

Negative electrode active material for non-aqueous electrolyte secondary batteries

A lithium ion battery including a negative electrode having a negative electrode active material layer that contains lithium silicate particles and a binder. The lithium silicate particles include composite particles including a lithium silicate phase and silicon particles dispersed in the lithium silicate phase, wherein a carbon material is present inside the composite particles, and an area ratio of the carbon material occupying a cross section of the composite particles is 0.008 to 6%. The binder includes at least a first resin, wherein the first resin is at least cue selected from the group consisting of polyacrylic acid, a polyacrylic acid salt, and their derivatives. The first resin is contained in an amount of 2 mass % or less in the negative electrode active material layer.

Lithium ion battery

A negative electrode active substance particle according to one embodiment of the present invention, comprises a mother particle that has: a silicate phase that includes Na, Si, and at least one element selected from M, M, M, Mand M(M is an alkali earth metal, and M, M, Mand Mare elements other than alkali metals, alkali earth metals or Si); and silicon particles dispersed in the silicate phase. The contents of the elements in the silicate phase are: 9-52 mol % of Na; 3-50 mol % of M, M, M, Mand M; and at least 25 mol % of Si.

Negative electrode active substance for secondary battery, and secondary battery

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

Disclosed is a negative electrode material for a non-aqueous electrolyte secondary battery, including: a lithium silicate phase; silicon particles dispersed in the lithium silicate phase; and at least one element Me dispersed in the lithium silicate phase, and selected from the group consisting of a rare-earth element and an alkaline-earth metal. The composition of the lithium silicate phase is represented, for example, by the formula: LiSiO, and satisfies 0&#x3c;z&#x3c;2, and the element Me is dispersed in the lithium silicate phase, for example, as an Me oxide.

Negative electrode material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery

Disclosed is a negative electrode material including: a lithium silicate phase that contains a lithium silicate; and silicon particles that are dispersed in the lithium silicate phase, wherein the silicon particles have a crystallite size of 10 nm or more, and the lithium silicate has a composition represented by the following formula: LiSiO.(x&#x2212;2)SiO, where 2&#x3c;x&#x2264;18 is satisfied.

Negative electrode material and non-aqueous electrolyte secondary battery

The initial charge/discharge efficiency and cycle characteristics of a non-aqueous electrolyte secondary battery that contains a silicon material as a negative-electrode active material are improved. A negative-electrode active material particle () according to an embodiment contains a base particle (), which includes a lithium silicate phase () represented by LiSiO{0&#x3c;z&#x3c;2} and silicon particles () dispersed in the lithium silicate phase (). The symmetry determined by an image analysis of a backscattered electron image of a cross section of the base particle () is 1.5 or less. The symmetry refers to the ratio (b/a) of the half width at half maximum b of a peak on the high-gray-scale side to the half width at half maximum a of the peak on the low-gray-scale side in a histogram of color distinction based on 256 gray levels for each pixel of the backscattered electron image.

Growing community of inventors

Osaka, Japan

Norihisa Yamamoto