# US 5,702,843 A · Nonaqueous secondary battery

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- Number: US 5,702,843 A
- Document ID: US5702843A
- Status: Granted
- Kind: A
- Application number: 08/640,137
- Filed: 1996-04-30
- Granted: 1997-12-30
- Earliest claimed: 1995-05-24
- Assignees: Sharp Kabushiki Kaisha
- Inventors: Takehito Mitate; Motoaki Nishijima
- Web page: https://patentgrep.com/patent/US5702843A

## CPC

- H01M 4/136: Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
- H01M 4/581: {Chalcogenides or intercalation compounds thereof}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/587: for inserting or intercalating light metals
- H01M 2300/0068: inorganic
- H01M 2300/0082: Organic polymers
- Y02E 60/10: Energy storage using batteries
- 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

## Abstract

A nonaqueous secondary battery is provided which comprises a positive electrode, a negative electrode and a nonaqueous ion conductor, either one of the positive electrode and the negative electrode containing lithium or a lithium absorbable and desorbable substance as an active material thereof, the other electrode containing a lithium transition-metal nitride of an anti-fluorite type structure as an active material thereof.

## Claims

### Claim 1

A nonaqueous secondary battery comprising a positive electrode, a negative electrode and a nonaqueous ion conductor, either the positive electrode or the negative electrode containing lithium or a lithium absorbable and desorbable substance as an active material thereof and the other electrode contains as the active material a lithium transition-metal nitride of an anti-fluorite structure represented by Li.sub.x MnN.sub.4 wherein 5.ltoreq.x.ltoreq.7.6 or by Li.sub.x FeN.sub.2 wherein 2.5.ltoreq.x.ltoreq.3.8.

### Claim 2 (depends on 1)

A nonaqueous secondary battery as set forth in claim 1, wherein the negative electrode contains carbon or graphite as the active material and the positive electrode contains said lithium transition-metal nitride.

### Claim 3

A nonaqueous secondary battery comprising a positive electrode, a negative electrode and a nonaqueous ion conductor, the negative electrode containing a lithium transition-metal nitride of an anti-fluorite structure as the active material and the positive electrode contains as the active material a chalcogen compound or a transition-metal oxide which is initially subjected to a discharge process.

### Claim 4 (depends on 3)

A nonaqueous secondary battery as set forth in claim 3, wherein the transition-metal oxide is selected from the group consisting of MnO.sub.2, V.sub.2 O.sub.5, V.sub.6 O.sub.13, TiO.sub.2, WO.sub.3, MoO.sub.3, Nb.sub.2 O.sub.5, VO.sub.2, CrO.sub.2, Cr.sub.3 O.sub.8, TiS.sub.2, MoS.sub.2 and MoS.sub.3.

### Claim 5 (depends on 3)

A nonaqueous secondary battery as set forth in claim 3, wherein the lithium transition-metal nitride is represented by Li.sub.x MN.sub.y wherein M is Ti, V, Cr, Mn, Fe, Nb, Ta, Mo or W, 1.ltoreq.x.ltoreq.7.6 and 2.ltoreq.y.ltoreq.4.

### Claim 6

A nonaqueous secondary battery comprising a positive electrode, a negative electrode and a nonaqueous ion conductor, the negative electrode containing as an active material a lithium transition-metal nitride of an anti-fluorite structure, the positive electrode containing as an active material a lithium-containing manganese dioxide having a composition ratio Li/Mn of not greater than 1/2.

### Claim 7 (depends on 6)

A nonaqueous secondary battery as set forth in claim 6, wherein the lithium transition-metal nitride is represented by Li.sub.x MN.sub.y wherein M is Ti, V, Cr, Mn, Fe, Nb, Ta, Mo or W, 1.ltoreq.x.ltoreq.7.6 and 2.ltoreq.x.ltoreq.4.

### Claim 8 (depends on 6)

A nonaqueous secondary battery as set forth in claim 6, wherein the lithium transition-metal nitride is represented by Li.sub.x MnN.sub.4 wherein 5.ltoreq.x.ltoreq.7.6 or by Li.sub.x FeN.sub.2 wherein 2.5.ltoreq.x.ltoreq.3.8.