# US 7,608,366 B2 · Nonaqueous electrolytic secondary battery and method of producing anode material thereof

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- Number: US 7,608,366 B2
- Document ID: US7608366B2
- Status: Granted
- Kind: B2
- Application number: 11/516,228
- Filed: 2006-09-06
- Published: 2007-01-18
- Granted: 2009-10-27
- Earliest claimed: 2001-05-15
- Assignees: Fdk Corporation
- Inventors: Takashi Suzuki; Masanori Nakanishi; Yoshiro Harada; Hiroto Sagisaka
- Web page: https://patentgrep.com/patent/US7608366B2

## CPC

- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/1393: of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/364: {as mixtures}
- H01M 4/587: for inserting or intercalating light metals
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A nonaqueous electrolyte secondary battery having a positive electrode made of a carbonaceous material, an electrolyte containing a lithium salt, and a negative electrode made of metallic lithium or a material capable of occluding and releasing lithium, wherein said positive electrode is formed from a boronized graphitic material containing boron or a boron compound such that the content of boron therein is 0.05-11 wt %. A method for production of the positive electrode of the nonaqueous electrolyte secondary battery.

## Claims

### Claim 1

A nonaqueous electrolyte secondary battery comprising:
a positive electrode made of a graphitic material,
an electrolyte containing a lithium salt; and
a negative electrode made of a carbonaceous material capable of occluding and releasing lithium metal or lithium,
wherein said positive electrode is an graphitic material that has not been introduced with a conductor, the graphitic material is a graphite crystal having some of carbon atoms forming hexagonal network planes replaced by boron atoms or having boron atoms infiltrated into between layers of hexagonal network planes, and said positive electrode is formed from boron or a boron compound contained in the graphite, such that the content of boron therein is 0.05-11 wt %.

### Claim 2 (depends on 1)

A nonaqueous electrolyte secondary battery as defined in claim 1, wherein the positive electrode is formed from a silicon-containing graphitic material containing silicon or a silicon compound such that the content of silicon therein is 0.01-5 wt %.

### Claim 3 (depends on 1, 2)

A nonaqueous electrolyte secondary battery defined in any of claims 1 and 2, wherein the graphitic material meets the following requirements (a) and (b):
(a) the graphitic material having a graphite crystal structure has the (002) plane such that the average interplaner spacing d(002) is no larger than 3.365 Å;
(b) Raman spectroscopy with an argon ion laser beam having a wavelength of 5145 Å gives a peak (Pa) in the wavelength region of 1580±100 cm−1 and a peak (Pb) in the wavelength region of 1360±100 cm−1, with the peak (Pa) having a peak intensity (Ia) and the peak (Pb) having a peak intensity (Ib) such that the value of R defined as Value (R)=Ib/Ia is no smaller than 0.35.