# US 10,184,075 B2 · Strontium bromide phase change material

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- Number: US 10,184,075 B2
- Document ID: US10184075B2
- Status: Granted
- Kind: B2
- Application number: 14/913,398
- Filed: 2014-08-22
- Published: 2016-07-14
- Granted: 2019-01-22
- Earliest claimed: 2013-08-23
- Assignees: Sunamp Limited
- Applicants: Sunamp Limited
- Inventors: Andrew John Bissell; Colin Pulham; David Oliver
- Web page: https://patentgrep.com/patent/US10184075B2

## CPC

- C09K 5/063: {Materials absorbing or liberating heat during crystallisation; Heat storage materials}
- Y02E 60/14: Thermal energy storage
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

There is herein described a phase change material (PCM) for use in energy storage systems. More particularly, there is described a phase change material comprising Strontium Bromide and a Metal Halide that is optimal to storing heat in about the 76° C. to 88° C. temperature range.

## Claims

### Claim 1

A phase change material (PCM) comprising:
about 65 wt. % to about 95 wt. % Strontium Bromide Hexahydrate; and
at least one Metal Halide selected from the group consisting of Magnesium Bromide; Zinc Bromide; Cobalt Bromide; Lithium Bromide; Sodium Bromide; Potassium Bromide; Calcium Bromide; Iron Bromide; Copper Bromide; Aluminium Bromide; and any hydrate or combination thereof;
wherein the PCM exhibits a phase change at a temperature range of about 76° C. to about 88° C.

### Claim 2 (depends on 1)

A phase change material (PCM) according to claim 1, wherein the PCM is used in an energy storage system.

### Claim 3 (depends on 1)

A phase change material (PCM) according to claim 1, wherein the Metal Halide is Magnesium Bromide or a hydrate thereof.

### Claim 4 (depends on 1)

A phase change material (PCM) according to claim 1, wherein the PCM further comprises Strontium salts of Chloride.

### Claim 5 (depends on 1)

A phase change material (PCM) according to claim 1, wherein the Strontium Bromide Hexahydrate is present in an amount of about 65 wt. %.

### Claim 6 (depends on 1)

A phase change material (PCM) according to claim 1, wherein the Metal Halide is present in an amount from about 25 wt. % to about 35 wt. %.

### Claim 7 (depends on 1)

A phase change material (PCM) according to claim 1, wherein the PCM is about 25 wt. % to about 35 wt. % MgBr2.6H2O, about 55 wt. % to about 75 wt. % SrBr2.6H2O and about 1 wt. % to about 5 wt. % water.

### Claim 8 (depends on 1)

A phase change material (PCM) according to claim 1, wherein the PCM comprises 32 wt. % MgBr2.6H2O, 65 wt. % SrBr2.6H2O and 3 wt. % water and exhibits a phase change at a temperature of about 77° C.

### Claim 9 (depends on 1)

A method for forming the phase change material (PCM) of claim 1 comprising:
providing Strontium Bromide Hexahydrate;
providing at least one Metal Halide; and
mixing said Strontium Bromide Hexahydrate and at least one Metal Halide together;
wherein the PCM exhibits a phase change at a temperature range of about 76° C. to about 88° C.

### Claim 10 (depends on 9)

A method for forming a phase change material PCM according to claim 9, wherein when the PCM is formed directly in a final heat battery, the Strontium Bromide Hexahydrate and Metal Halide are mixed together to form a mixture in a mixing vessel or heat battery enclosure.

### Claim 11 (depends on 10)

A method for forming a phase change material PCM according to claim 10, wherein during the mixing, the temperature of the mixing vessel or heat battery enclosure is increased and maintained at a temperature higher than the phase change temperature by about 2° C. to about 5° C.

### Claim 12 (depends on 11)

A method for forming a phase change material PCM according to claim 11, wherein the resulting mixture is stirred or mixed until the mixture is liquid and homogenous.