Aerogel composite
An aerogel composite which maintains a high degree of hydrophobicity, and also an excellent level of heat insulation properties even when exposed to a high-temperature environment.
1 . An aerogel composite comprising: a substrate; and an aerogel including a plurality of open pores, wherein the aerogel includes a plurality of silica aerogel particles, wherein according to a result of performing an NMR analysis on the silica aerogel particles by using water (H 2 O) as a saturation fluid, a ratio of T 1 relaxation time to T 2 relaxation time (T 1 /T 2 ) is 0.4×10 3 to 1.0×10 3 .
2 . The aerogel composite of claim 1 , wherein according to the result of performing the NMR analysis on the silica aerogel particles by using water (H 2 O) as a saturation fluid, the ratio of T 1 relaxation time to T 2 relaxation time (T 1 /T 2 ) is 0.4×10 3 to 0.9×10 3 .
3 . The aerogel composite of claim 1 , wherein after heat-treating the silica aerogel particles at a temperature of 200° C. for 1 hour, and then performing the NMR analysis on the silica aerogel particles by using water (H 2 O) as a saturation fluid, the ratio of T 1 relaxation time to T 2 relaxation time (T 1 /T 2 ) is 0.4×10 3 to 1.0×10 3 .
4 . The aerogel composite of claim 3 , wherein the ratio of T 1 /T 2 of the silica aerogel particles after the heat-treating the silica aerogel particles at a temperature of 200° C. for 1 hour is 0.8 times to 1.2 times the ratio of T 1 /T 2 of the silica aerogel particles before the heat-treating the silica aerogel particles at a temperature of 200° C. for 1 hour.
5 . The aerogel composite of claim 3 , wherein the ratio of T 1 /T 2 of the silica aerogel particles after the heat-treating the silica aerogel particles at a temperature of 200° C. for 1 hour is 0.85 times to 1.1 times the ratio of T 1 /T 2 of the aerogel particles before the heat-treating the silica aerogel particles at a temperature of 200° C. for 1 hour.
6 . The aerogel composite of claim 1 , wherein the aerogel comprises pores having a pore diameter of 5 nm to 20 nm at 25% or less of a pore volume of a skeletal structure of the aerogel.
7 . The aerogel composite of claim 6 , wherein the aerogel comprises pores having a pore diameter of 5 nm to 20 nm at 10% or greater and 25% or less of the pore volume of the skeletal structure of the aerogel.
8 . The aerogel composite of claim 1 , wherein the aerogel composite has a moisture impregnation rate (wt %) of 4 wt % or less, which is represented by Equation 1:
Moisture
impregnation
rate
(
wt
%
)
=
{
(
Weight
of
a
sample
after
impregnation
-
Weight
of
the
sample
before
impregnation
)
/
(
Weight
of
the
sample
before
impregnation
)
}
×
100
[
Equation
1
]
wherein in Equation 1, the weight of a sample after impregnation is a weight measured after impregnating an aerogel composite sample in distilled water at 21±2° C. for 15 minutes, wherein the aerogel composite sample has a size of 100 mm×100 mm in width×length.
9 . The aerogel composite of claim 1 , wherein the aerogel composite has a moisture impregnation rate (wt %) of 3 wt % or less, which is represented by Equation 1:
Moisture
impregnation
rate
(
wt
%
)
=
{
(
Weight
of
a
sample
after
impregnation
-
Weight
of
the
sample
before
impregnation
)
/
(
Weight
of
the
sample
before
impregnation
)
}
×
100
[
Equation
1
]
wherein in Equation 1, the weight of a sample after impregnation is a weight measured after impregnating an aerogel composite sample in distilled water at 21±2° C. for 15 minutes, wherein the aerogel composite sample has a size of 10 mm×10 mm in width×length.
10 . The aerogel composite of claim 8 , wherein the moisture impregnation rate (wt %), represented by Equation 1, after performing a heat treatment on the aerogel composite at a temperature of 200° C. for 1 hour is 10 wt % or less.
11 . The aerogel composite of claim 1 , wherein the aerogel composite has a water vapor absorption rate of 2.5 wt % or less, according to the ASTM C1104 test method.
12 . The aerogel composite of claim 1 , wherein the aerogel comprises at least one selected from the group consisting of silica, methylsilylated silica, dimethylsilylated silica, and trimethylsilylated silica.
13 . The aerogel composite of claim 1 , wherein the plurality of silica aerogel particles comprises a particle in which a plurality of aerogel particles having a particle diameter of greater than 0 nm to 5 nm are aggregated or bonded.
14 . The aerogel composite of claim 13 , wherein the aggregated or bonded aerogel particles have an average particle diameter of 5 nm to 2,000 nm.
15 . The aerogel composite of claim 1 , wherein the aerogel composite has a thickness of 0.5 mm to 20 mm.
16 . The aerogel composite of claim 1 , wherein the aerogel composite has a density of 0.05 g/cm 3 to 0.50 g/cm 3 .
17 . The aerogel composite of claim 1 , wherein the aerogel composite has a compressive strength of 20 kPa to 80 kPa at 10% strain, and has a tensile strength of 30 N/cm 2 to 60 N/cm 2 .
18 . A heat insulation member comprising the aerogel composite of claim 1 .
19 . The heat insulation member of claim 18 , further comprising a support member positioned on at least one of an upper surface of the aerogel composite or a lower surface of the aerogel composite.
20 . 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.