Anode material, method for producing it and non-aqueous electrolyte cell employing such anode materials

• US 5,294,498 A
• Filed: 11/02/1992
• Issued: 03/15/1994
• Est. Priority Date: 03/02/1991
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Azuma, Hideo, Omaru, Atsuo, Nishi, Yoshio
• Primary Examiner(s): GORGOS, KATHRYN L
• Application Number:
  US07/940,949
• Time in Patent Office: 498 Days
• Field of Search: 429/218, 429/40, 429/122, 429/194, 252/502, 204/291, 204/242, 501/99, 501/87, 432/13
• US Class Current: 429/122
• CPC Class Codes: H01M 10/05 Accumulators with non-aqueous electrolyte H01M10/39 takes precedence
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

An anode material composed mainly of a difficultly graphatizable carbon or coke (easily graphatizable coke) consisting essentially of carbon, phosphorus and oxygen, and containing phosphorus in an amount of 0.2 to 9.0 wt %, is disclosed. The anode material exhibits a peak in a ³¹ P solid NMR spectrum in a range of ±100 ppm based on orthophosphoric acid, and a peak in a 2p orbital spectrum of a phosphorus atom in XPS of not more than 135 eV. The anode material is prepared by adding phosphoric acid or phosphorus oxides to an organic material or a carbonic material. A non-aqueous liquid electrolyte cell is produced from the above anode material, an Li-containing cathode and a liquid electrolyte.

Claims

1. An anode material comprising as its primary portion a coke compound obtained by adding phosphorous pentaoxide to a material selected from the group consisting of a carbonic material or an organic material heat-treated at a temperature not higher than 700°

C., wherein said coke compound consists essentially of carbon, phosphorus and oxygen, said coke compound containing phosphorous in an amount of 0.2 to 9.0 wt % and exhibiting a peak of a ³¹ P solid NMR spectrum in a range of ±

100 ppm based on orthophosphoric acid, said coke compound exhibiting a peak in a 2p orbital spectrum of phosphorous atom of not more than 135 eV in X-ray photoelectron spectroscopy for a carbon-carbon linkage energy in the 1s orbital spectrum of a carbon atom of 284.6 eV.

2. A method for producing an anode material mainly composed of a coke compound consisting essentially of carbon, phosphorous and oxygen, said method comprising the steps of:

adding a phosphorous compound, in an amount of 0.2 to 32 wt % in terms of phosphorus, to a material selected from the group consisting of an organic material or a carbonic material treated to a temperature of 700°

C. or less and sintered to a coke to produce a mixture, and sintering the mixture in an inert atmosphere.

3. The method of claim 2 wherein the phosphorus compound is selected from group consisting of:

phosphorus pentaoxide or orthophosphoric acid.

4. A non-aqueous liquid electrolyte cell comprising:

an anode material mainly composed of coke compound consisting essentially of carbon, phosphorous and oxygen, said coke compound containing phosphorous in an amount of 0.2 to 9.0 wt % and exhibiting a peak in a ³¹ P solid NMR spectrum in a range of ±

100 ppm based on orthophosphoric acid, said coke compound exhibiting a peak in a 2p orbital spectrum of a phosphorous atom of not more than 135 eV in X-ray photoelectron spectroscopy for a carbon-carbon linkage energy in the 1s orbital spectrum of a carbon atom of 284.6 eV,

a cathode containing Li, and

a non-aqueous liquid electrolyte.