Nec Corporation

University of Hyogo

Qian Cheng

Noriyuki Tamura

Katsumi Maeda

Ryota Yuge

Kentaro Nakahara

Mika Shiba

Yoshiaki Matsuo

The invention provides a lithium ion battery comprising: an anode comprising an anode active material layer on an anode current collector, the anode active material layer having a mass load higher than 60 g/m; a cathode comprising a cathode active material layer on a cathode current collector, the cathode active material layer having a mass load higher than 80 g/m; and an electrolytic solution comprising an imide anion based lithium salt and LiPOF, wherein at least one of the anode and cathode active material layers comprises a spacer comprising silicone ball.

Silicone ball containing electrode and lithium ion battery including the same

The invention provides a lithium ion battery, including an anode, a cathode and an electrolytic solution including imide anion based lithium salt and LiPOF. The cathode includes a cathode active material particle and a carbon conductive additive forming an island-bridge structure on the surface of the cathode active material particle. The carbon conductive additive includes graphenes partially covered with the surface of the cathode active material particle to form an island structure, carbon blacks attached on the surface of the graphene and carbon nanotubes connecting between graphenes as a bridge structure.

Carbon conductive additives for lithium ion battery

The object of the invention is to provide a new lithium ion battery system that can have both high energy density and fast chargeable capability. The invention provides a lithium ion battery, comprising an anode comprising an anode active material layer on an anode current collector, the anode active material layer having a mass load higher than 60 g/m, a cathode comprising a cathode active material layer on a cathode current collector, the cathode active material layer having a mass load higher than 100 g/m, and an electrolytic solution comprising an imide anion based lithium salt and LiPOF, wherein at least one of the anode and cathode active material layers comprises a spacer composed of a hard carbon.

Spacer included electrodes structure and its application for high energy density and fast chargeable lithium ion batteries

In order to provide a lithium ion secondary battery having both high energy density and an excellent charge-rate characteristic, there is provided a lithium ion secondary battery including a positive electrode containing a positive electrode active material made of a lithium composite oxide, and nano-carbon having a Li ion diffusion path as an additive, and an electrolyte solution containing 0.5 mol/l or more of Li[(FSO)N] as an electrolyte, LiPOFas an additive, and a ternary-system of ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC), as solvents.

Lithium ion secondary battery

To provide an anode material for implementing a lithium-ion battery that is capable of high-speed charging and excellent in cycle characteristics, and has high capacity. The anode material includes a spherical particle of graphite or graphite-carbon composite provided with pores on the surface and inner channels in the core part of the particle, the inner channels being interconnected to the pores.

Fast chargeable carbon anode material with inner channels

In order to provide a lithium ion secondary battery having both high energy density and an excellent charging-rate characteristic, in the lithium ion secondary battery comprising a positive electrode, a negative electrode and an electrolyte solution, the electrolyte solution comprises 0.5 mol/l or more of Li[(FSO)N], 0.5 mol/l or more of LiPF, and LiPOF; and the negative electrode comprises graphite deposited with amorphous carbon or graphite coated with amorphous carbon and having a specific surface area of 4 m/g or less, as a negative electrode active material.

An anode material for a lithium ion battery, comprising an oxygen-containing carbon where oxygen is in the form of functional groups, the oxygen being distributed gradient from the surface to the inside of the carbon, and the carbon having an interlayer space dlarger than 0.3357 nm; and a porous graphene layer covering the oxygen-containing carbon, the graphene being in the form of monolayer or few-layer graphene.

Hierarchical oxygen containing carbon anode for lithium ion batteries with high capacity and fast charging capability

A porous graphene material with 1 to 200 graphene layers, wherein: at least one monolayer graphene is included; pores with the size of 70 nm to 200 nm are scattered over the surface of the material and the number of pores is 10 to 500 per &#x3bc;m; an oxygen concentration is below 0.8 atomic %; and the ratio of the peak height (I) of D band in a Raman scattering spectrum of the material to that of the peak height (I) of G band at 1,570 to 1,596 cmin the spectrum (I/I) is between 1 and 1.35. The porous graphene material is suitable for conductive additives for electrodes of Lithium ion battery.

Additives for fast chargeable lithium ion batteries

The present invention provides a novel carbon material comprising a three-dimensional graphene network constituting a plurality of cells interconnecting as a whole, where at least one of the cells has single-layer graphene wall. The carbon material is suitable for a lithium ion battery.

Carbon material, anode material and spacer additive for lithium ion battery

The present invention provides an anode material for a lithium-ion battery comprising a carbon particle having a particle size of 5 &#x3bc;m to 30 &#x3bc;m, and including defective portions on a surface of the carbon particle, the defective portions being holes or pores formed by anodic oxidation of the carbon particle.

Electrochemically modified carbon material for lithium-ion battery

The present invention provides an anode material for a lithium-ion battery comprising a carbon particle having a particle size of 5 &#x3bc;m to 30 &#x3bc;m, and including defective portions on a surface of the carbon particle, the defective portions being grooves formed by cathodically exfoliating graphene layers from the carbon particle.

In order to provide a negative electrode carbon material capable of providing a lithium secondary battery improved in the capacity and the rate characteristic, there are carried out a first heat treatment of subjecting graphite particles to a heat treatment in an oxidizing atmosphere, and following the first heat treatment, a second heat treatment of subjecting the resulting graphite particles to a heat treatment in an inert gas atmosphere at a higher temperature than in the first heat treatment.

Negative electrode carbon material, method for producing negative electrode carbon material, negative electrode for lithium secondary battery, and lithium secondary battery

A negative electrode for a lithium ion secondary battery, including a negative electrode active material layer containing a negative electrode active material including silicon (Si) as a constituent element, in which a coating including iron (Fe), manganese (Mn) and oxygen (O) as constituent elements is formed on a surface of the negative electrode active material layer.

Negative electrode for lithium ion secondary battery, and lithium ion secondary battery

There is provided a negative electrode carbon material for a lithium secondary battery, including a graphite-based material in which holes are formed in a graphene layer plane.

Negative electrode carbon material for lithium secondary battery and method for manufacturing the same, and negative electrode for lithium secondary battery, and lithium secondary battery

The present invention has an object to provide a negative electrode carbon material capable of providing a lithium secondary battery improved in the capacity characteristic, and a negative electrode for a lithium secondary battery and a lithium secondary battery using the negative electrode carbon material. The negative electrode carbon material for a lithium secondary battery according to the present invention comprises an oxidized amorphous carbon material comprising oxidized graphene layers. The oxidized amorphous carbon material can be obtained by subjecting an amorphous carbon to an oxidation treatment so that graphene layers of carbon crystallites contained in the amorphous carbon are oxidized.

Growing community of inventors

Tokyo, Japan

Qian Cheng