Negative electrode material for lithium-ion battery, and use therefor

Patent metadata

Field	Value
Publication number	US-10164257-B2
Application number	US-201515304580-A
Country	US
Kind code	B2
Filing date	Apr 16, 2015
Priority date	Apr 16, 2014
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

A negative electrode material for a lithium ion battery containing a composite material, the composite material including silicon-containing particles, graphitic carbon material particles, and a carbonaceous carbon material, in which the composite material has a ratio (A/B) of an area (A) of a peak near 100 eV derived from metal Si to an area (B) of a peak near 103 eV derived from silicon oxide, as measured by XPS, of not less than 0.10 and not more than 2.30. Also disclosed is a paste including the negative electrode material, as well as a negative electrode for a lithium ion battery including a formed body of the paste and a lithium ion battery including the negative electrode.

First claim

The invention claimed is:

1. A negative electrode material for lithium ion battery, the negative electrode material comprising a composite material,
wherein the composite material comprises silicon-containing particles, graphitic carbon material particles, and a carbonaceous carbon material and has a ratio (A/B) of an area (A) of a peak near 100 eV derived from Si metal to an area (B) of a peak near 103 eV derived from silicon oxide, as measured by X-ray photoelectron spectroscopy, of not less than 0.10 and not more than 2.30.

2. The negative electrode material for lithium ion battery according to claim 1 , wherein an oxygen content of the composite material is not more than 3% by mass.

3. The negative electrode material for lithium ion battery according to claim 1 , wherein a BET specific surface area of the composite material is not less than 2 m 2 /g and not more than 22 m 2 /g.

4. The negative electrode material for lithium ion battery according to claim 1 , wherein a 10% diameter (D 10 ) in a volume-based cumulative particle size distribution of the composite material, as measured by a laser diffraction method, is not less than 2.0 μm.

5. The negative electrode material for lithium ion battery according to claim 1 , wherein the silicon-containing particles comprise a surface layer comprising SiO x (0<x≤2), and has a 90% diameter (D 90 ) of not more than 200 nm in a number-based cumulative primary particle size distribution.

6. The negative electrode material for lithium ion battery according to claim 1 , wherein an amount of the silicon-containing particles is not less than 5 parts by mass and not more than 35 parts by mass relative to 100 parts by mass of the graphitic carbon material particles.

7. The negative electrode material for lithium ion battery according to claim 1 , wherein an oxygen content of the silicon-containing particles is not less than 1% by mass and not more than 18% by mass.

8. The negative electrode material for lithium ion battery according to claim 1 , wherein the graphitic carbon material particles are composed of artificial graphite.

9. The negative electrode material for lithium ion battery according to claim 1 , wherein the graphitic carbon material particles are in a shape of a scale, and have an average interplanar distance (d 002 ) of [002] plane of not more than 0.337 nm and a crystallite size (Lc) of not less than 50 nm and not more than 1000 nm as calculated by analysis of an X-ray diffraction pattern with CuKα radiation.

10. The negative electrode material for lithium ion battery according to claim 1 , wherein the carbonaceous carbon material comprises a heat-treated product of petroleum pitch or coal pitch.

11. The negative electrode material for lithium ion battery according to claim 10 , wherein the petroleum pitch or the coal pitch has a softening point of 80° C. to 300° C.

12. The negative electrode material for lithium ion battery according to claim 1 , wherein an amount of the carbonaceous carbon material is not less than 2% by mass and not more than 40% by mass relative to mass of the composite material.

13. A paste, comprising the negative electrode material for lithium ion battery according to claim 1 , and a binder.

14. A negative electrode for lithium ion battery, comprising a formed body of the paste according to claim 13 .

15. A lithium ion battery, comprising the negative electrode according to claim 14 .

Assignees

• Showa Denko Kk
• Umicore Nv

Inventors

• Otsuka Yasunari
• Murata Hirokazu

Classifications

• H01M4/624

  Electric conductive fillers · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/58

  of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates · CPC title

• H01M4/587 Primary

  for inserting or intercalating light metals · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title