# US 2023/0265331 A1 · Latent heat storage material for ultra-cold applications and container for temperature-controlled transport at ultra-cold temperatures

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- Number: US 2023/0265331 A1
- Document ID: US20230265331A1
- Status: Published application
- Kind: A1
- Application number: 18/174,219
- Filed: 2023-02-24
- Published: 2023-08-24
- Earliest claimed: 2022-02-24
- Assignees: Va-Q-Tec AG
- Applicants: va-Q-tec AG
- Inventors: Thomas Wollheim; Peter Hoock; Stefan Hiebler; Christoph Rathgeber; Henri Schmit; Simon Pöllinger; Stefanie Tafelmeier
- Web page: https://patentgrep.com/patent/US20230265331A1

## CPC

- C09K 5/06: the change of state being from liquid to solid or vice versa
- C09K 5/063: {Materials absorbing or liberating heat during crystallisation; Heat storage materials}
- B65D 81/3818: {formed with double walls, i.e. hollow}
- B65D 81/382: {provided with liquid material between double walls}
- Y02E 60/14: Thermal energy storage
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A latent heat storage material for ultra-cold applications, comprising at least one lithium salt, at least one solvent, and at least one nucleating agent, wherein the at least one nucleating agent is selected from one or a combination of sodium carbonate, lithium carbonate, potassium carbonate, barium fluoride, sodium nitrate, and/or lithium hydroxide.

## Claims

### Claim 1

Latent heat storage material for ultra-cold applications, comprising at least one lithium salt, at least one solvent, and at least one nucleating agent, wherein the at least one nucleating agent is selected from one or a combination of sodium carbonate, lithium carbonate, potassium carbonate, barium fluoride, sodium nitrate, and/or lithium hydroxide.

### Claim 2 (depends on 1)

Latent heat storage material according to claim 1, wherein said at least one lithium salt comprises lithium bromide and/or lithium chloride.

### Claim 3 (depends on 1)

Latent heat storage material according to claim 1, wherein the at least one solvent comprises water.

### Claim 4 (depends on 1)

Latent heat storage material according to claim 1, comprising the at least one lithium salt in a range between 20 wt.-% to 45 wt.-%.

### Claim 5 (depends on 1)

Latent heat storage material according to claim 1, wherein the proportion and/or composition of the at least one lithium salt and the proportion and/or composition of the at least one solvent is selected such that the melting temperature Ts of the latent heat storage material is in a range between -60° C. ≥ Ts ≥ -85° C., in particular in a range between -60° C. ≥ Ts ≥ -75°.

### Claim 6 (depends on 5)

Latent heat storage material according to claim 5, wherein the proportion and/or the composition of the at least one nucleating agent is selected such that the following applies to the crystallization temperature TK of the latent heat storage material and the melting temperature Ts of the latent heat storage material: 0 K ≥ TK - Ts ≥ -15 K, in particular 0 K ≥ TK - Ts ≥ -10 K.

### Claim 7 (depends on 6)

Latent heat storage material according to claim 6, comprising the at least one nucleating agent in a range between 0.01 wt.-% to 30 wt.-%, in particular in a range between 0.5 wt.-% to 5 wt.-%.

### Claim 8 (depends on 1)

Container for temperature-controlled transport at ultra-cold temperatures, comprising a container wall which completely encloses an interior space, and at least one latent heat storage element comprising a latent heat storage material according to claim 1, wherein the at least one latent heat storage element is disposed within the interior space and/or in the container wall.

### Claim 9 (depends on 8)

Container according to claim 8, comprising at least one vacuum insulation element disposed in the container wall.