# US 5,350,647 A · Electrodes for electrochemical devices

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- Number: US 5,350,647 A
- Document ID: US5350647A
- Status: Granted
- Kind: A
- Application number: 07/983,368
- Filed: 1992-11-30
- Granted: 1994-09-27
- Earliest claimed: 1990-12-24
- Inventors: Stephen F. Hope; Joseph B. Kejha
- Web page: https://patentgrep.com/patent/US5350647A

## CPC

- H01M 4/40: Alloys based on alkali metals
- H01M 4/46: Alloys based on magnesium or aluminium
- 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

An improved alloy or composite electrode of lithium, magnesium and other materials in which magnesium is in the range of 5 to 50% of the total weight of the composite. The lithium and magnesium metal can be heated until they melt, and combine, and are cast into an ingot which is then formed into the desired shape as an electrode and placed into an electrochemical device or formed as an anode and placed into a battery. Other methods of combination can be used as desired to obtain the electrode.

## Claims

### Claim 1

An electrode for use in electrochemical devices which comprises
a lithium-based alloy consisting of lithium, magnesium and other compatible materials, where the magnesium is in the amount of 5% to b 50% of the total weight of the alloy, and the other materials are selected from the group consisting of silicon, aluminum, tin, cadmium, and carbon, in trace amounts to 30% of the total weight of the alloy, with magnesium present as the predominant metal by weight after lithium.

### Claim 2

An electrode for use in electrochemical devices which comprises
a lithium-based composite consisting of lithium, magnesium, and other materials, where the magnesium is in the amount of 5% to 50% of the total weight of the composite, and the other materials are selected from the group consisting of silicon, aluminum, tin, cadmium and carbon, in trace amounts to 30% of the total weight of the composite with magnesium the predominant metal by weight after lithium.

### Claim 3 (depends on 2)

An electrode as described in claim 2 in which said magnesium component is of magnesium fibers.

### Claim 4 (depends on 2)

An electrode as described in claim 2 in which said magnesium component is of magnesium expanded foil. consisting of silicon, aluminum, tin, cadmium and carbon.

### Claim 5 (depends on 2)

An electrode as described in claim 2 in which said composite consists of magnesium and other materials suspended in a lithium matrix.

### Claim 6 (depends on 5)

An electrode as described in claim 5 in which said magnesium component is of magnesium fibers.

### Claim 7 (depends on 5)

An electrode as described in claim 5 in which said magnesium component is of expanded magnesium foil.

### Claim 8 (depends on 1)

An electrode as described in claim 1 in which said electrochemical device is a lithium battery cell, and said electrode is an anode.

### Claim 9 (depends on 2)

An electrode as described in claim 2 in which said electrochemical device is a lithium battery cell, and said electrode is an anode.

### Claim 10 (depends on 1)

An electrode as described in claim 1 which increases the cyclability of the electrochemical devices.

### Claim 11 (depends on 2)

An electrode as described in claim 2 which increases the cyclability of the electrochemical devices.

### Claim 12 (depends on 2)

A composite as described in claim 2 in which said magnesium is suspended in a lithium matrix.