Sumitomo Osaka Cement Co., Ltd.

Sumitomo Metal Mining Company, Ltd.

Masataka Oyama

Satoru Oshitari

Ryuuta Yamaya

Takao Kitagawa

Kouji Oono

Tsutomu Nozoe

Kenta Ooishi

Koji Oono

Naoyuki Kurosawa

An electrode material including a carbonaceous-coated electrode active material having primary particles of the electrode active material and secondary particles that are aggregates of the primary particles, and a carbonaceous film that coats the primary particles of the electrode active material and the secondary particles that are the aggregates of the primary particles, in which a specific surface area, which is obtained using a nitrogen adsorption method, is 4 m/g or more and 40 m/g or less, a volume of micropores per unit mass is 0.05 cm/g or more and 0.3 cm/g or less, and an average micropore diameter, which is obtained from the volume of the micropores per unit mass and the specific surface area, is 26 nm or more and 90 nm or less.

Electrode material, method for manufacturing electrode material, electrode, and lithium ion battery

A lithium-ion secondary battery including a cathode, an anode, and an electrolyte, in which the lithium-ion secondary battery includes inorganic phosphate particles, and the cathode includes cathode active material particles which include central particles made of LiAMPO(0&#x2264;x&#x2264;1.1, 0.8&#x2264;y&#x2264;1.1, and 0&#x2264;z&#x2264;0.2; here, A represents at least one element selected from the group consisting of Fe, Mn, Co, and Ni, and M represents at least one element selected from the group consisting of Mg, Ca, Co, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, and rare earth elements) and a carbonaceous film that coats surfaces of the central particles.

Lithium-ion secondary battery

An electrode material including a carbonaceous-coated electrode active material having primary particles of an electrode active material, secondary particles that are aggregates of the primary particles, and a carbonaceous film that coats the primary particles of the electrode active material and the secondary particles that are the aggregates of the primary particles, in which, in the electrode material, when ten random 180 nm&#xd7;180 nm views are observed using an electron microscope at a magnification of 100,000 times, the number of free carbon aggregates is three or less, and the number of protrusions twice or more as thick as the carbonaceous film is three or less.

An electrode material for a lithium ion secondary battery of the present invention includes an electrode active material represented by LiFeMnMgAPOand a carbonaceous film coating a surface of the electrode active material, a particle diameter D10 of secondary particles is 0.5 &#x3bc;m or more, a particle diameter D90 of the secondary particles is 25 &#x3bc;m or less, and a ratio (O/I) of an average value of thicknesses I of the carbonaceous film on the surfaces of the primary particles in a range of 0.3 &#x3bc;m or less from a center of the secondary particle at 300 measurement points to an average value of thicknesses O of the carbonaceous film on the surfaces of the primary particles in a range of 0.3 &#x3bc;m or less from an outermost surface of the secondary particle at 300 measurement points is 0.85 or more and less than 1.00.

Electrode material for lithium ion secondary battery, electrode for lithium ion secondary battery, and lithium ion secondary battery

A cathode material for a lithium-ion secondary battery of the present invention is active material particles including central particles represented by General Formula LiADPO(0.9&#x3c;x&#x3c;1.1, 0&#x3c;y&#x2264;1, 0&#x2264;z&#x3c;1, and 0.9&#x3c;y+z&#x3c;1.1; here, A represents at least one element selected from the group consisting of Co, Mn, Ni, Fe, Cu, and Cr, and D represents at least one element selected from the group consisting of Mg, Ca, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, Sc, and Y) and a carbonaceous film that coats surfaces of the central particles, in which a coarse particle ratio in a particle size distribution is 35% or more and 65% or less.

Cathode material for lithium-ion secondary battery, cathode for lithium-ion secondary battery, and lithium-ion secondary battery

A cathode material for a lithium-ion secondary battery of the present invention is active material particles including central particles represented by LiAMPOand a carbonaceous film that coats surfaces of the central particles, in which a median diameter is 0.50 &#x3bc;m or more and 0.80 &#x3bc;m or less, and a chromaticity b* in an L*a*b* color space is 1.9 or more and 2.3 or less.

An electrode material including a carbonaceous-coated electrode active material having primary particles of an electrode active material and secondary particles that are aggregates of the primary particles, and a carbonaceous film that coats the primary particles of the electrode active material and the secondary particles that are the aggregates of the primary particles, in which a proportion of a volume of micropores having a micropore diameter of 50 nm or less in a volume of micropores having a micropore diameter of 300 nm or less, which is obtained using a nitrogen adsorption method, is 40% or more.

A cathode material is provided which comprises secondary particles of cathode active material particles including central particles of LiFeMPOand a carbonaceous film which coats the central particles, wherein a particle size distribution thereof has maximum values of a relative particle amount on both fine and coarse particle sides. A particle diameter with the maximum relative particle amount on the fine particle side is in a range A of 0.70 &#x3bc;m to 2.00 &#x3bc;m, and a particle diameter with the maximum relative particle amount on the coarse particle side is in a range B of 7.00 &#x3bc;m to 15.00 &#x3bc;m. A difference between maximum values of a relative particle amount is 2.00% to 6.00%.

Embodiments provide an electrode material for a lithium ion battery capable of decreasing a metal elution amount even when an electrode active material having a large specific surface area is used as the electrode material and capable of obtaining a lithium ion battery in which a decrease in a capacity caused by storage at a high temperature in a fully charged state is suppressed and a lithium ion battery. The electrode material for a lithium ion battery includes electrode active material particles and a carbonaceous film that coats surfaces of the electrode active material particles, in which a tap density is 0.95 g/cmor more and 1.6 g/cmor less, and a volume ratio of micro pores to a total volume that is evaluated from nitrogen adsorption measurement is 1.5% or more and 2.5% or less.

Electrode material for lithium ion battery and lithium ion battery

A cathode material for a lithium-ion secondary battery which includes granulated bodies in which primary particles are aggregated, wherein an average particle diameter of the granulated bodies is 4.50 &#x3bc;m or more and 6.20 &#x3bc;m or less, and particle diameters of 90% or more of the granulated bodies are 1.00 &#x3bc;m or more and 11.00 &#x3bc;m or less, wherein particle diameters of the granulated bodies are evaluated such that 300 granulated bodies are randomly selected from a view of the granulated bodies using a scanning electron microscope, a plurality of diameters of each of the 300 granulated bodies that pass through a central point thereof are evaluated, and a maximum diameter selected from the plurality of diameters is considered as a particle diameter of each of granulated bodies.

A cathode material for a lithium-ion secondary battery including: granulated bodies in which primary particles are aggregated, wherein an average particle diameter of the granulated bodies is 0.90 &#x3bc;m or more and 2.00 &#x3bc;m or less, particle diameters of 90% or more of the granulated bodies are 0.25 &#x3bc;m or more and 3.50 &#x3bc;m or less, wherein particle diameters of the granulated bodies are evaluated such that 300 granulated bodies are randomly selected from a view of the granulated bodies using a scanning electron microscope, a plurality of diameters of each of the 300 granulated bodies that pass through a central point thereof are evaluated, and a maximum diameter selected from said plurality of diameters is considered as a particle diameter of each of the granulated bodies.

A cathode material for a lithium-ion secondary battery, the cathode material including: secondary particles which are granulated active material particles including central particles and a carbonaceous film that coats surfaces of the central particles, wherein a granulated body breakage degree ((a&#x2212;b)/a) of the secondary particles is 0.03 or more and 0.30 or less, and the granulated body breakage degree is calculated based on a relative particle amount a, at which a maximum peak is shown in a particle size distribution of the secondary particles, and a relative particle amount b, at which a maximum peak in a particle size distribution of the secondary particles is shown after a dispersion treatment of the secondary particles is performed using a homogenizer.

Cathode material for lithium-ion secondary battery and method for manufacturing the same, cathode for lithium-ion secondary battery, and lithium-ion secondary battery

A cathode material including an aggregate formed by aggregating active material particles, in which the active material particle is a particle including a cathode active material as a formation material and a carbonaceous material is provided on a surface of the particle, a ratio between a weight ratio of carbon contained in the aggregate to a BET specific surface area of the cathode material is in a range of 0.08 to 0.2, a tap density is in a range of 0.9 g/cmto 1.5 g/cm, and an oil absorption amount for which N-methyl-2-pyrrolidone is used is 70 cc/100 g or less.

Cathode material and lithium ion battery

A cathode material which does not easily deteriorate when used in batteries, a method for producing cathode materials, a cathode, and a lithium ion battery are provided. A cathode material including a cathode active material, in which the cathode active material is expressed by LiADPO(here, A represents one or more metal elements selected from the group consisting of Co, Mn, Ni, Fe, Cu, and Cr, D represents one or more metal elements selected from the group consisting of Mg, Ca, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, Sc, Y, and rare earth elements, 0&#x3c;x&#x3c;1, 0&#x3c;y&#x3c;1, 0&#x2264;z&#x3c;1.5, and 0.9&#x3c;y+z&#x2264;1), and, in thermogravimetric analysis in an inert gas atmosphere, when a temperature is increased in a temperature range from 100&#xb0; C. to 300&#xb0; C. at a temperature-increase rate of 10&#xb0; C./minute, a weight loss ratio in the temperature range is 0.3% by weight or less.

Growing community of inventors

Tokyo, Japan

Masataka Oyama