NONAQUEOUS-ELECTROLYTE BATTERIES AND NONAQUEOUS ELECTROLYTIC SOLUTIONS

• US 20120244425A1
• Filed: 03/26/2012
• Published: 09/27/2012
• Est. Priority Date: 09/29/2009
• Status: Abandoned Application

• Current Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Original Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Inventors: TOKUDA, Hiroyuki
• Application Number:
  US13/429,580
• Publication Number:
  US 20120244425A1
• Time in Patent Office: Days
• US Class Current: 429/199
• 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 10/0564 the electrolyte being constituted of organic materials only
• CPC Class Codes: H01M 10/0567 characterised by the additives
• CPC Class Codes: H01M 10/0568 characterised by the solutes
• CPC Class Codes: H01M 10/0569 characterised by the solvents
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 2004/028 Positive electrodes
• CPC Class Codes: H01M 2300/0037 Mixture of solvents
• CPC Class Codes: H01M 4/5825 Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

The invention is to provide a nonaqueous-electrolyte battery which comprises a current collector, a positive electrode containing a lithium-containing phosphoric acid compound represented by LixMPO₄ as a positive-electrode active material, a negative electrode containing a negative-electrode active material capable of occluding and releasing lithium ions, and a nonaqueous electrolytic solution containing a chain ether and a cyclic carbonate having an unsaturated bond.

Claims

1. A nonaqueous-electrolyte battery which comprises:

a current collector;

a positive electrode containing a lithium-containing phosphoric acid compound represented by LixMPO₄ (wherein M is at least one element selected from the group consisting of Group-2 to Group-12 metals of the periodic table, and x satisfies 0<

x≦

1.2) as a positive-electrode active material;

a negative electrode containing a negative-electrode active material capable of occluding and releasing lithium ions; and

a nonaqueous electrolytic solution,

wherein the nonaqueous electrolytic solution contains

(1) a chain ether and

(2) a cyclic carbonate having an unsaturated bond.

3. The nonaqueous-electrolyte battery according to claim 1 or 2, wherein the lithium-containing phosphoric acid compound is represented by LixMPO₄ (wherein M is at least one element selected from the group consisting of the Group-4 to Group-11 transition metals in the fourth period of the periodic table, and x satisfies 0<

x≦

1.2).

4. The nonaqueous-electrolyte battery according to claim 1, wherein the content of the cyclic carbonate having an unsaturated bond is 0.001-5% by mass based on the whole electrolytic solution.

5. The nonaqueous-electrolyte battery according to claim 1 or 2, wherein the nonaqueous electrolytic solution contains ethylene carbonate in an amount of 10% by volume or more.

6. The nonaqueous-electrolyte battery according to claim 1 or 2, wherein the chain ether is represented by R¹OR² (wherein R¹ and R² each represent a monovalent organic group which has 1-8 carbon atoms and may have a fluorine atom, and R¹ and R² may be the same or different).

7. The nonaqueous-electrolyte battery according to claim 1 or 2, wherein the negative-electrode active material is a carbonaceous material.

8. The nonaqueous-electrolyte battery according to claim 1 or 2, wherein the current collector has an electroconductive layer on the surface thereof, the electroconductive layer being different from the current collector in compound composition.

9. A nonaqueous electrolytic solution for use in the nonaqueous-electrolyte battery according to claim 1 or 2.

2. A nonaqueous-electrolyte battery which comprises:

a current collector;

a positive electrode containing a lithium-containing phosphoric acid compound represented by LixMPO₄ (wherein M is at least one element selected from the group consisting of Group-2 to Group-12 metals of the periodic table, and x satisfies 0<

x≦

1.2) as a positive-electrode active material;

a negative electrode containing a negative-electrode active material capable of occluding and releasing lithium ions; and

a nonaqueous electrolytic solution,

wherein the nonaqueous electrolytic solution contains

(1) a chain ether and

(2) at least one compound selected from lithium fluorophosphates, lithium sulfonates, imide lithium salts, sulfonic acid esters, and sulfurous acid esters.