JP2014139942A5

JP2014139942A5 -

Info

Publication number: JP2014139942A5
Application number: JP2014053634A
Authority: JP
Filing date: 2014-03-17
Publication date: 2014-09-11
Anticipated expiration: 2028-04-04

Claims

A carbon-coated graphite negative electrode material having graphite particles as nuclei and a carbon layer covering the graphite particles;
Before Kikuro lead substance particles have a structure in which a plurality of flat particles are non-parallel collectively or linked to each other,
The intensity ratio is R value of the peak intensity in the range of 1300～1400Cm ^-1 as measured by Raman spectroscopy (ID) and the peak intensity in the range of ^{1560~1650cm -1 (IG) (ID /} IG) is 0.3 or less,
Nitrogen element concentration that will be measured by X-ray photoelectron spectroscopy (XPS) is 1.5~10at%, carbon coated graphite anode material for lithium-ion secondary battery.

The carbon-coated graphite negative electrode material for a lithium ion secondary battery according to claim 1, wherein the carbon layer is a carbonized product of a nitrogen-containing polymer compound.

The carbon-coated graphite negative electrode material for a lithium ion secondary battery according to claim 1 or 2, wherein a ratio (mass ratio) of carbon to the graphite particles is 0.001 to 0.02.

The average particle size is 10-30 μm, the true specific gravity is 2.10 or more, and the specific surface area by nitrogen gas adsorption is 0.5-10 m. ^２2 The carbon-coated graphite negative electrode material for a lithium ion secondary battery according to any one of claims 1 to 3, which is / g.

  A step of dispersing graphite particles having a massive structure in which a plurality of flat particles are assembled or bonded non-parallel to each other and having an aspect ratio of 5 or less in a mixed solution of a nitrogen-containing polymer compound and a solvent for dissolving the same. When,
  Removing the solvent to produce graphite particles coated with the nitrogen-containing polymer compound;
  The graphite particles coated with the nitrogen-containing polymer compound are fired, and 1300 to 1400 cm measured by Raman spectroscopy. ^−１-1 Peak intensity (ID) in the range of 1560-1650 cm ^−１-1 The R value (ID / IG), which is the intensity ratio with the peak intensity (IG) in the range of 0.3, is 0.3 or less, and the nitrogen element concentration on the surface measured by X-ray photoelectron spectroscopy (XPS) is 1. Obtaining a carbon-coated graphite negative electrode material that is 5 to 10 at%,
  A method for producing a carbon-coated graphite negative electrode material for a lithium ion secondary battery.

The carbon-coated graphite negative electrode material according to claim 5, wherein the carbon-coated graphite negative electrode material has a carbon ratio (mass ratio) to the graphite particles of 0.001 to 0.02. Production method.

The carbon-coated graphite negative electrode material has an average particle size of 10 to 30 μm, a true specific gravity of 2.10 or more, and a specific surface area of 0.5 to 10 m by nitrogen gas adsorption. ^２2 The manufacturing method of the carbon covering graphite negative electrode material for lithium ion secondary batteries of Claim 5 or 6 which is / g.

The graphite negative electrode material for lithium ion secondary batteries as described in any one of Claims 1-4, or the graphite negative electrode for lithium ion secondary batteries produced with the manufacturing method as described in any one of Claims 5-7. Graphite negative electrode for lithium ion secondary battery using the material.

The lithium ion secondary battery using the graphite negative electrode for lithium ion secondary batteries of Claim 8.