Non-aqueous electrolyte cell and solid electrolyte cell

• US 20030143465A1
• Filed: 10/02/2001
• Published: 07/31/2003
• Est. Priority Date: 10/05/2000
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Miyake, Masami, Hosoya, Mamoru, Takahashi, Kimio
• Granted Patent: US 7,255,957 B2
• Time in Patent Office: Days
• US Class Current: 429/231.95
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0565 Polymeric materials, e.g. gel-type or solid-type
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 4/136 Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
• CPC Class Codes: H01M 4/5825 Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A cell which is not deteriorated in cell characteristics and which maintains a cell shape encapsulated in a laminate film even when overdischarged to a cell voltage of 0V. The cell includes a cathode containing a compound having the formula Li_xFe_1-yM_yPO₄, where M is at least one selected from the group consisting of Mn, Cr, Co, Cu, Ni, V, Mo, Ti, Zn, Al, Ga, Mg, B and Nb, with 0.05≦x≦1.2 and 0≦y≦0.8, an anode and a solid electrolyte. An electrode member 1 comprised of the cathode and the anode, layered together with the interposition of a solid electrolyte, is encapsulated in a laminate film 2.

Claims

9. A solid electrolyte cell comprising:

a cathode material having a cathode current collector on which is deposited a cathode active material formed of a compound of an olivinic crystal structure having the formula Li_xFe_1-yM_yPO₄, where M is at least one selected from the group consisting of Mn, Cr, Co, Cu, Ni, V, Mo, Ti, Zn, Al, Ga, Mg, B and Nb, with 0.05≦

x>

1.2 and 0≦

y≦

0.8, said compound being used alone or in combination with other materials;

an anode material having an anode current collector on which is deposited an anode active material; and

a solid electrolyte;

said cathode and anode materials being layered and coiled together so that said anode and cathode materials are disposed towards an inner periphery and towards an outer periphery, respectively, to form a cell device, which is encapsulated in an exterior material;

wherein

a current collector exposing portion is provided by collector exposure on a surface facing said exterior material of said cathode material positioned on the radially outermost portion of said cell device or on the surfaces of the facing portions of the anode material lying on the radially innermost portions of said cell device.

1. A non-aqueous electrolyte cell comprising:

a cathode material having a cathode current collector on which is deposited a cathode active material formed of a compound of an olivinic crystal structure having the formula Li_xFe_1-yM_yPO₄, where M is at least one selected from the group consisting of Mn, Cr, Co, Cu, Ni, V, Mo, Ti, Zn, Al, Ga, Mg, B and Nb, with 0.05≦

x≦

1.2 and 0≦

y≦

0.8, said compound being used alone or in combination with other materials;

an anode material having an anode current collector on which is deposited an anode active material;

a separator for separating said cathode material and said anode material from each other; and

a non-aqueous electrolyte solution;

said cathode and anode materials being layered and wound together, with the interposition of said separator, so that said anode and cathode materials are disposed towards an outer periphery and towards an outer periphery, respectively, to form a cell device, which is encapsulated in an exterior material;

wherein

a current collector exposing portion is provided by collector exposure on a surface facing said exterior material of said cathode material positioned on the radially outermost portion of said cell device or on the surfaces of the facing portions of the anode material lying on the radially innermost portions of said cell device.

2. The non-aqueous electrolyte cell according to claim 1 wherein said anode active material is such an anode active material capable of doping/undoing lithium.

3. The non-aqueous electrolyte cell according to claim 1 wherein said anode active material is an LiFePO₄ carbon composite material composed of said compound and a carbon material.

4. The non-aqueous electrolyte cell according to claim 3 wherein the carbon content per unit volume in said LiFePO₄ carbon composite material is not less than 3 wt %.

5. The non-aqueous electrolyte cell according to claim 3 wherein the carbon material of said LiFePO₄ carbon composite material has a strength to area ratio of a diffraction line appearing at the number of waves of 1570 to 1590 cm⁻

1 (G peak) to a diffraction line appearing at the number of waves of 1340 to 1360 cm<sup>−

1</sup> (D peal) of the Raman spectrum in Raman spectrometry, or A(D/G), equal to 0.3 or higher.

6. The non-aqueous electrolyte cell according to claim 3 wherein the powder density of said LiFePO₄ carbon composite material not less than 2.2 g/cm³.

7. The non-aqueous electrolyte cell according to claim 3 wherein the Bullnauer Emmet Teller specific surface is not less than 10.3 m²/g.

8. The non-aqueous electrolyte cell according to claim 3 wherein the first-order particle size of said LiFePO₄ carbon composite material is not larger than 3.1 μ

m.

10. The solid electrolyte cell according to claim 9 wherein a separator is provided between said cathode and anode materials.

11. The solid electrolyte cell according to claim 9 wherein said anode active material is such an anode active material capable of doping/undoing lithium:

12. The solid electrolyte cell according to claim 9 wherein said anode active material is an LiFePO₄ carbon composite material composed of said compound and a carbon material.

13. The solid electrolyte cell according to claim 12 wherein the carbon content per of Mn, Cr, Co, Cu, Ni, V, Mo, Ti, Zn, Al, Ga, Mg, B and Nb and 0.05≦

x≦

1.2 and 0≦

y≦

0.8, said compound being used alone or in combination with other materials;

an anode material having an anode current collector on which is deposited an anode active material; and

a solid electrolyte;

said cathode and anode materials being layered and coiled together so that said anode and cathode materials are disposed towards an inner periphery and towards an outer periphery, respectively, to form a cell device, which is encapsulated in an exterior material;

wherein

a current collector exposing portion is provided by collector exposure on a surface facing said exterior material of said cathode material positioned on the radially outermost portion of said cell device or on the surfaces of the facing portions of the anode material lying on the radially innermost portions of said cell device.

10-1. The solid electrolyte cell according to claim 9 wherein a separator is provided between said cathode and anode materials.

11-2. The solid electrolyte cell according to claim 9 wherein said anode active material is such an anode active material capable of doping/undoing lithium.

12-3. The solid electrolyte cell according to claim 9 wherein said anode active material is an LiFePO₄ carbon composite material composed of said compound and a carbon material.

13-4. The solid electrolyte cell according to claim 12 wherein the carbon content per