Honda Motor Co., Ltd.

Nichia Corporation

Hiroto Maeyama

Toru Sukigara

Atsushi Ogawa

Kenichi Kobayashi

Soshi Kawamura

Ushio Harada

Sokichi Okubo

Noriaki Kamaya

Kazuki Chiba

Masahiro Ohta

Tadashi Tsunoda

A positive electrode active material for a nonaqueous electrolyte secondary battery includes particles of a lithium-transition metal composite oxide that contains nickel in the composition thereof and has a layered structure. The particles have an average particle size Dbased on electron microscopic observation in a range of 1 μm to 7 μm in which a ratio D/Dof a 50% particle size Din volume-based cumulative particle size distribution to the average particle size based on electron microscopic observation is in a range of 1 to 4, and a ratio D/Dof a 90% particle size Dto a 10% particle size Din volume-based cumulative particle size distribution is 4 or less.

Positive electrode active material for nonaqueous electrolyte secondary battery

An electrode for nonaqueous electrolyte secondary batteries, provided with a collector and a positive electrode active material layer arranged on the collector and contains a positive electrode active material. The positive electrode active material contains compound particles which have a layered structure composed of two or more transition metals, and which have an average particle diameter DSEM of from 1 μm to 7 μm (inclusive) based on the observation with an electron microscope, a ratio of the 50% particle diameter D50 in a volume-based cumulative particle size distribution to the average particle diameter DSEM, namely D50/DSEM of from 1 to 4 (inclusive), and a ratio of the 90% particle diameter D90 in the volume-based cumulative particle size distribution to the 10% particle diameter D10 in the volume-based cumulative particle size distribution, namely D90/D10 of 4 or less. The positive electrode active material layer has a void fraction of 10-45%.

Electrode for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery provided with same

A positive electrode active material for a nonaqueous electrolyte secondary battery includes particles of a lithium-transition metal composite oxide that contains nickel in the composition thereof and has a layered structure. The particles have an average particle size Dbased on electron microscopic observation in a range of 1 &#x3bc;m to 7 &#x3bc;m in which a ratio D/Dof a 50% particle size Din volume-based cumulative particle size distribution to the average particle size based on electron microscopic observation is in a range of 1 to 4, and a ratio D/Dof a 90% particle size Dto a 10% particle size Din volume-based cumulative particle size distribution is 4 or less.

Provided are: a positive electrode for solid-state batteries, which enables the achievement of high energy density, rate characteristics and durability; a solid-state battery; and a method for producing a solid-state battery. A positive electrode for solid-state batteries, which is provided with a collector and a positive electrode active material layer that contains a positive electrode active material, and which is configured such that: the ratio of the positive electrode active material, which is composed of primary particles, in the positive electrode active material layer is 60% by mass or more; the void fraction in the positive electrode active material layer is less than 20% by volume; and portions of the positive electrode active material layer other than the positive electrode active material, which is composed of primary particles, contain a solid electrolyte. The present invention also provides: a solid-state battery which comprises this positive electrode for solid-state batteries; and a method for producing this solid-state battery.

Positive electrode for solid-state batteries, solid-state battery and method for producing solid-state battery

Provided is a solid electrolyte sheet having a self-supporting property while having a small thickness and flexibility. The solid electrolyte sheet is formed using a support having a specific porosity and a specific thickness. Specifically, the solid electrolyte sheet is formed in which a solid electrolyte is filled in a support having a porosity of 60% or more and 95% or less and a thickness of 5 &#x3bc;m or more and less than 20 &#x3bc;m.

Solid electrolyte sheet and solid state battery

Provided is a solid electrolyte laminated sheet having a self-supporting property and capable of realizing a solid state battery having high output characteristics. A plurality of supports are used, a solid electrolyte is filled in each support to form a self-supporting sheet, and the self-supporting sheets are superimposed to form a solid electrolyte laminated sheet. Specifically, the solid electrolyte laminated sheet is configured by setting a layer of the solid electrolyte laminated sheet in contact with a positive electrode layer being the outermost layer as a self-supporting sheet in which a solid electrolyte resistant to oxidation is filled, and a layer in contact with a negative electrode layer being the opposite outermost layer as a self-supporting sheet in which a solid electrolyte resistant to reduction is filled.

Solid electrolyte laminated sheet and solid state battery

A cell holder () for holding a secondary battery cell () including a positive electrode active material, a negative electrode active material, and an electrolyte which is disposed between the positive electrode active material and the negative electrode active material and is in contact with both the positive electrode active material and the negative electrode active material, and for outputting power from the secondary battery cell (), includes a cell holder body (), and a pressing portion () which is supported by the cell holder body () and includes a disc spring () being in contact with a first end face of the secondary battery cell () in a first direction and pressing the first end face of the secondary battery cell () in a second direction opposite to the first direction.

Cell holder

An electrode for nonaqueous electrolyte secondary batteries, which is provided with a collector and a positive electrode active material layer that is arranged on the collector and contains a positive electrode active material. The positive electrode active material is configured to contain compound particles which have a layered structure composed of two or more transition metals, and which have an average particle diameter DSEM of from 1 &#x3bc;m to 7 &#x3bc;m (inclusive), a ratio of the 50% particle diameter Din a volume-based cumulative particle size distribution to the average particle diameter DSEM, namely D/DSEM of from 1 to 4 (inclusive), and a ratio of the 90% particle diameter Din the volume-based cumulative particle size distribution to the 10% particle diameter Din the volume-based cumulative particle size distribution, namely D/Dof 4 or less. The positive electrode active material layer has a void fraction of 10-45%.

The current collector plate arrangement structure of the bipolar solid-state battery includes a battery cell stack formed by stacking a plurality of solid-state battery cells each including a positive electrode active material layer, a negative electrode active material layer, and a solid electrolyte layer disposed between the positive electrode active material layer and the negative electrode active material layer and in contact with the positive electrode active material layer and the negative electrode active material layer. The bipolar solid-state battery includes a positive electrode current collector and a negative electrode current collector on a side surface with respect to a stacking direction. Current collector plates and of the solid-state battery cells are arranged on at least one of a front surface serving as one end surface in the stacking direction and a rear surface serving as the other end surface in the stacking direction.

Growing community of inventors

Wako, Japan

Hiroto Maeyama