# US 2021/0340423 A1 · Stable salt hydrate-based thermal energy storage materials

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- Number: US 2021/0340423 A1
- Document ID: US20210340423A1
- Status: Published application
- Kind: A1
- Application number: 17/229,035
- Filed: 2021-04-13
- Published: 2021-11-04
- Earliest claimed: 2020-04-15
- Assignees: UT-Battelle, LLC
- Applicants: UT-Battelle, LLC
- Inventors: Yuzhan Li; Kyle R. Gluesenkamp; Monojoy Goswami; Navin Kumar; Timothy J. Laclair; Orlando Rios
- Web page: https://patentgrep.com/patent/US20210340423A1

## 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

A phase change material composition for latent heat storage is provided. In one embodiment, the phase change material includes a salt hydrate having a melting temperature (Tm) of from 1° C. to 100° C. as determined in accordance with ASTM E793. The phase change material further includes a stabilizing matrix including a polysaccharide selected from the group of a nanocellulose, a sulfonated polysaccharide, a starch, a glycogen, a chitin, and combinations thereof. A composite article including the phase change material composition is also provided.

## Claims

### Claim 1

A phase change material composition for latent heat storage, comprising:
a salt hydrate having a melting temperature (Tm) of from 1° C. to 100° C. as determined in accordance with ASTM E793; and
a stabilizing matrix comprising a polysaccharide selected from the group of a nanocellulose, a sulfonated polysaccharide, a starch, a glycogen, a chitin, and combinations thereof.

### Claim 2 (depends on 1)

The phase change material composition of claim 1, wherein the phase change material composition exhibits improved congruent melting as compared to a composition substantially free of the stabilizing matrix.

### Claim 3 (depends on 1)

The phase change material composition of claim 1, wherein the stabilizing matrix comprises a nanocellulose, sulfonated polysaccharide, or a combination thereof.

### Claim 4 (depends on 3)

The phase change material composition of claim 3, wherein the stabilizing matrix comprises a nanocellulose.

### Claim 5 (depends on 4)

The phase change material composition of claim 4, wherein the salt hydrate comprises sodium acetate trihydrate (C2H3NaO2·3H2O).

### Claim 6 (depends on 3)

The phase change material composition of claim 3, wherein the stabilizing matrix comprises a sulfonated polysaccharide.

### Claim 7 (depends on 6)

The phase change material composition of claim 6, wherein the sulfonated polysaccharide comprises a dextran sulfate salt.

### Claim 8 (depends on 6)

The phase change material composition of claim 6, wherein the salt hydrate comprises sodium acetate trihydrate (C2H3NaO2·3H2O).

### Claim 9 (depends on 1)

The phase change material composition of claim 1, wherein the salt hydrate comprises sodium sulfate decahydrate (Na2SO4·10H2O), sodium acetate trihydrate (C2H3NaO2 3H2O), or a combination thereof.

### Claim 10 (depends on 1)

The phase change material composition of claim 1, wherein the salt hydrate and the stabilizing matrix are present in a weight ratio of from 100:1 to 10:1.

### Claim 11 (depends on 1)

The phase change material composition of claim 1 further comprising a nucleating agent.

### Claim 12 (depends on 11)

The phase change material composition of claim 11, wherein the nucleating agent is selected from the group of sodium tetraborate decahydrate, sodium phosphate dibasic dodecahydrate, and a combination thereof.

### Claim 13 (depends on 11)

The phase change material composition of claim 11, wherein the salt hydrate and the nucleating agent are present in a weight ratio of from 1:50 to 50:1.

### Claim 14 (depends on 1)

The phase change material composition of claim 1, wherein the salt hydrate has a melting temperature (Tm) of from 5° C. to 60° C. as determined in accordance with ASTM E793.

### Claim 15 (depends on 1)

The phase change material composition of claim 1, wherein the salt hydrate has an energy density in an amount of from 20 to 200 kWh/m3 as determined in accordance with ASTM E793.

### Claim 16 (depends on 1)

A composite material adapted to be in the presence of an energy source, the energy source adapted to provide heat, the composite material comprising:
a support adapted to be in thermal communication with the energy source; and
a phase change material composition according to claim 1, the phase change material composition disposed within the support;
wherein the heat generated by the energy source has a temperature greater than the melting temperature of the phase change material.

### Claim 17 (depends on 16)

The composite material of claim 16, wherein the phase change material composition exhibits improved congruent melting as compared to a composition substantially free of the stabilizing matrix.

### Claim 18 (depends on 16)

The composite material of claim 16, wherein the stabilizing matrix of the phase change material composition comprises a nanocellulose, sulfonated polysaccharide, or a combination thereof.

### Claim 19 (depends on 18)

The composite material of claim 18, wherein the stabilizing matrix of the phase change material composition comprises a nanocellulose.

### Claim 20 (depends on 18)

The composite material of claim 18, wherein the stabilizing matrix of the phase change material composition comprises a sulfonated polysaccharide.