Nonaqueous electrolyte battery

Patent metadata

Field	Value
Publication number	US-9882213-B2
Application number	US-72941210-A
Country	US
Kind code	B2
Filing date	Mar 23, 2010
Priority date	Mar 25, 2009
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

Abstract

A nonaqueous electrolyte battery includes a positive electrode, a negative electrode and a nonaqueous electrolyte. The positive electrode includes a lithium/manganese-containing oxide represented by Li a Mn b M c O Z (M is at least one selected from the group consisting of Ni, Co, Al and F, and a, b, c and Z satisfy the following equations: 0≦a≦2.5, 0<b≦1, 0≦c≦1 and 2≦Z≦3) and a Fe-containing phosphorous compound having an olivine structure. The negative electrode includes a titanium-containing metal oxide into which lithium ions are inserted and from which lithium ions are extracted.

First claim

What is claimed is:

1. A nonaqueous electrolyte battery comprising:
a positive electrode comprising a mixture of particles of a lithium manganese-containing oxide represented by Li a Mn b M c O z (M is at least one selected from the group consisting of Ni, Co, and F, and a, b, c and Z satisfy the following formulas: 0<a≦2.5, 0<b≦1, 0<c≦1 and 2≦Z≦3) and particles of a Fe-containing phosphorous compound having an olivine structure and represented by Li d Mn x Fe 1−x PO 4 , and d and x satisfy the following equations: 0≦d≦2.5, 0.5≦x<1;
a negative electrode comprising a titanium-containing metal oxide into which lithium ions are inserted and from which lithium ions are extracted; and
a nonaqueous electrolyte,
wherein a protective film comprising Fe is provided on a surface of the negative electrode, and
a weight of the particles of the Fe-containing phosphorous compound is 1% by weight or more and 80% by weight or less, based on 100% by weight of the particles of the lithium manganese-containing oxide.

2. The nonaqueous electrolyte battery according to claim 1 , wherein the weight of the particles of the Fe-containing phosphorous compound is 2% by weight or more and 60% by weight or less, based on 100% by weight of the particles of the lithium manganese-containing oxide.

3. The nonaqueous electrolyte battery according to claim 1 , wherein a weight of the particles of the Fe-containing phosphorous compound is 60% by weight or more and 80% by weight or less, based on 100% by weight of the particles of the lithium manganese-containing oxide.

4. The nonaqueous electrolyte battery according to claim 1 , wherein the titanium-containing metal oxide is at least one selected from the group consisting of monoclinic system titanium dioxide, Li 4+x Ti 5 O 12 and Li 2+x Ti 3 O 7 , and x may be varied in the following range: −1≦x≦3, depending on a charge/discharge reaction.

5. The nonaqueous electrolyte battery according to claim 1 , wherein
the titanium-containing metal oxide is at least one selected from the group consisting of a lithium titanium oxide having a spinel structure, a lithium titanium oxide having a rhamsdelite structure and a titanium dioxide, and
the nonaqueous electrolyte comprises a first solvent containing at least one selected from the group consisting of propylene carbonate, ethylene carbonate and γ-butyrolactone and a second solvent containing at least one selected from the group consisting of diethyl carbonate, methyl ethyl carbonate and dimethyl carbonate.

6. The nonaqueous electrolyte battery according to claim 1 , wherein
the titanium-containing metal oxide is at least one selected from the group consisting of a lithium titanium oxide having a spinel structure, a lithium titanium oxide having a rhamsdelite structure and a titanium dioxide, and
the nonaqueous electrolyte comprises a nonaqueous solvent containing ethylene carbonate and diethyl carbonate, and lithium tetrafluoroborate dissolved in the nonaqueous solvent.

7. The nonaqueous electrolyte battery according to claim 1 , wherein the titanium-containing metal oxide further contains lithium.

8. The nonaqueous electrolyte battery according to claim 1 , wherein the titanium-containing metal oxide is at least one selected from the group consisting of a lithium titanium oxide having a spinel structure, a lithium titanium oxide having a rhamsdelite structure and a titanium dioxide.

9. The nonaqueous electrolyte battery according to claim 8 , wherein the titanium dioxide is titanium dioxide having an anatase structure and/or monoclinic system titanium dioxide.

10. The nonaqueous electrolyte battery according to claim 1 , wherein the nonaqueous electrolyte comprises a first solvent containing at least one selected from the group consisting of propylene carbonate, ethylene carbonate and γ-butyrolactone and a second solvent containing at least one selected from the group consisting of diethyl carbonate, methyl ethyl carbonate and dimethyl carbonate.

11. The nonaqueous electrolyte battery according to claim 1 , wherein the positive electrode comprises a carbon material provided on a surface of the particles of the Fe-containing phosphorous compound.

12. The nonaqueous electrolyte battery according to claim 11 , wherein the carbon material includes carbonaceous materials in which a layer spacing d 002 of a (002) plane detected by X-ray diffraction is 0.37 nm or less.

13. The nonaqueous electrolyte battery according to claim 1 , wherein the positive electrode comprises a positive electrode layer comprising the mixture, and a specific surface area of the positive electrode layer measured by BET method falls within a range of 0.1 to 2 m 2 /g.

14. The nonaqueous electrolyte battery according to claim 1 , wherein the negative electrode comprises a negative electrode layer comprising the titanium-containing metal oxide, and a specific surface area of the negative electrode layer measured by BET method falls within a range of 3 to 50 m 2 /g.

15. The nonaqueous electrolyte battery according to claim 1 , wherein a ratio (Sp/Sn) of an area (Sp) of the positive electrode layer to an area (Sn) of the negative electrode layer falls within a range of 0.85 to 0.999.

16. The nonaqueous electrolyte battery according to claim 1 , wherein the nonaqueous electrolyte comprises a liquid organic electrolyte, a gel organic electrolyte or a solid nonaqueous electrolyte.

Assignees

• Takami Norio
• Inagaki Hiroki
• Matsuno Shinsuke
• Toshiba Kk

Inventors

• Takami Norio
• Inagaki Hiroki
• Matsuno Shinsuke

Classifications

• H01M4/364

  as mixtures · CPC title

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M10/0525

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

• H01M4/505 Primary

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title