Aerogel composite

Patent metadata

Field	Value
Publication number	US-12479734-B2
Application number	US-202418987296-A
Country	US
Kind code	B2
Filing date	Dec 19, 2024
Priority date	May 2, 2024
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

An aerogel composite has excellent thermal stability even when exposed to a high-temperature environment, thereby being capable of maintaining high heat insulation.

First claim

What is claimed is:

1 . An aerogel composite comprising:
a fiber substrate including a plurality of discrete fibers and voids between the fibers; and silica aerogel including a plurality of aerogel particles positioned on the fibers or in the voids between the fibers, and having a network structure including one or more pores, wherein: a weight retention rate measured after heating the aerogel composite at a temperature of 350° C. for 60 minutes is 96% or greater, and a weight retention rate measured after heating the aerogel composite at a temperature of 350° C. for each of 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, er and 30 minutes satisfies Equation 2 below:
A (%)={(Weight retention rate measured after heating for x minutes ( a ))−(Average value of weight retention rates after heating ( b ))}/(Average value of weight retention rates after heating ( b ))×100  [Equation 2]

wherein in the Equation 2 above: the x minutes is 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, or 30 minutes; the weight retention rate measured after heating for the x minutes (a) is a percentage (%) of a weight of the aerogel composite measured after heating the aerogel composite at a temperature of 350° C. for the x minutes with respect to a weight of the aerogel composite at 350° C. before the heating; an average value (b) of weight retention rates after the heating is an average value of weight retention rates obtained after heating the aerogel composite at a temperature of 350° C. for each of 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, and 30 minutes; and A is a real number of −1.0 to +1.0 wherein a volume ratio of the fibers per unit volume of the aerogel composite is 2% to 12% and a volume ratio of the aerogel including pores and the voids between the discrete fibers per unit volume of the aerogel composite is 88% to 98%.

2 . The aerogel composite of claim 1 , wherein A is a real number of −0.80 to +0.80.

3 . The aerogel composite of claim 1 , wherein the weight retention rate measured after heating the aerogel composite at a temperature of 350° C. for 30 minutes is 97% or greater.

4 . The aerogel composite of claim 1 , wherein, when the aerogel composite is heated at a temperature of 350° C. for each of 5 minutes and 60 minutes, an absolute value (B) of change in weight retention rate of the aerogel composite per unit time satisfies Equation 3 below:
B =|{(Weight retention rate measured after heating for y minutes)−(Weight retention rate measured after heating for z minutes)}/( y−z )|  [Equation 3]

wherein in the Equation 3 above:
y is 5 minutes, and z is 60 minutes;
a weight retention rate measured after heating for the y minutes is a percentage (%) of the weight of the aerogel composite measured after heating the aerogel composite at a temperature of 350° C. for the y minutes with respect to the weight of the aerogel composite at 350° C. before the heating;
a weight retention rate measured after heating for the z minutes is a percentage (%) of the weight of the aerogel composite measured after heating the aerogel composite at a temperature of 350° C. for the z minutes with respect to the weight of the aerogel composite at 350° C. before the heating; and
B is a real number of 1.0×10 −3 to 7.0×10 −2 .

5 . The aerogel composite of claim 1 , wherein the volume ratio of the fibers per unit volume of the aerogel composite is 5% to 10%, and the volume ratio of the aerogel including pores and the voids between the discrete fibers per unit volume of the aerogel composite is 90% to 95%.

6 . The aerogel composite of claim 1 , wherein the fiber substrate in the aerogel composite and the silica aerogel are included in a weight ratio of 1:0.4 to 2.

7 . The aerogel composite of claim 1 , wherein the silica aerogel comprises silica, methylsilylated silica, dimethylsilylated silica, trimethylsilylated silica, or a mixture thereof.

8 . The aerogel composite of claim 1 , wherein the aerogel composite has a moisture impregnation rate (wt %) of 4 wt % or less with respect to a specimen having a size of 100 mm×100 mm and represented by Equation 4 below:
Moisture impregnation rate (wt %)={(Weight of specimen after impregnation−Weight of specimen before impregnation)/(Weight of specimen before impregnation)}×100  [Equation 4]

wherein in the Equation 4 above,
a weight of a specimen after impregnation is the weight measured after impregnating an aerogel composite specimen in distilled water at 21±2° C. for 15 minutes.

9 . The aerogel composite of claim 1 , wherein the aerogel composite has a moisture impregnation rate (wt %) of 2 wt % or less with respect to a specimen having a size of 10 mm×10 mm and represented by Equation 4 below:
Moisture impregnation rate (wt %)={(Weight of specimen after impregnation−Weight of specimen before impregnation)/(Weight of specimen before impregnation)}×100  [Equation 4]

wherein in the Equation 4 above,
a weight of a specimen after impregnation is the weight measured after impregnating an aerogel composite specimen in distilled water at 21±2° C. for 15 minutes.

10 . A heat insulation member comprising the aerogel composite of claim 1 .

11 . The heat insulation member of claim 10 , wherein the heat insulation member further comprises a support member positioned on at least one surface of an upper surface of the aerogel composite and a lower surface thereof.

12 . A battery module comprising a module case having an internal space, one or more battery cells positioned within the internal space, and the aerogel composite of claim 1 positioned within the internal space.

13 . A battery pack comprising the battery module of claim 12 .

Assignees

• Lg Chemical Ltd

Inventors

• Kim Mi Ri
• Han Hye Kyung
• Kim Kyung Inn
• Shin Min Hwa
• Oh Kyoung Shil

Classifications

• B32B2262/101

  Glass fibres · CPC title

• B32B2266/126

  Aerogel, i.e. a supercritically dried gel · CPC title

• B32B2307/304

  Insulating · CPC title

• D10B2101/06

  Glass · CPC title

• D06M2400/02

  Treating compositions in the form of solgel or aerogel · CPC title