# US 4,399,202 A · Lithium battery

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- Number: US 4,399,202 A
- Document ID: US4399202A
- Status: Granted
- Kind: A
- Application number: 06/271,236
- Filed: 1981-06-08
- Granted: 1983-08-16
- Earliest claimed: 1979-03-19
- Assignees: Sanyo Electric Co., Ltd.
- Inventors: Hironosuke Ikeda; Satoshi Narukawa; Shigehiro Nakaido
- Web page: https://patentgrep.com/patent/US4399202A

## CPC

- H01M 6/50: Methods or arrangements for servicing or maintenance, e.g. for maintaining operating temperature (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569)
- H01M 6/16: with organic electrolyte (H01M6/18 takes precedence)
- H01M 2006/5094: {Aspects relating to capacity ratio of electrolyte/electrodes or anode/cathode}
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY

## Abstract

In a lithium battery having a negative electrode formed with lithium as active material and the positive electrode formed with manganese dioxide, carbon fluoride or the like as the active material, the discharge capacity of the negative electrode is made smaller than the discharge capacity of the positive electrode, whereby a drop in the battery voltage during the final discharge stage is steepened, and prevents a device using such a lithium battery as a power supply from operating in an unstable manner, thereby improving the reliability of such device.

## Claims

### Claim 1

A battery comprising:
a positive electrode consisting essentially of manganese dioxide as an active material;
a negative electrode consisting essentially of lithium as an active material, said negative electrode having a much larger electrode potential and a smaller discharge capacity than said positive electrode; and
an electrolyte comprising of an organic material which is a solution of a salt of lithium in an organic solvent.

### Claim 2 (depends on 1)

The battery of claim 1 further including a separator layer located between the positive and negative electrodes, said separator layer being formed of polypropylene non-woven fabric.

### Claim 3 (depends on 1)

The battery of claim 1 wherein the salt of lithium includes lithium perchlorate and the organic solvent includes propylene carbonate.

### Claim 4 (depends on 3)

The battery of claim 3, wherein said negative electrode has a discharge capacity of about 50 mAH.

### Claim 5 (depends on 1)

The battery of claim 1 wherein the organic solvent is propylene carbonate mixed with 1.2 dimethoxyethane at an equivalent ratio by volume.