【Technical Field】
[1] This application claims the benefit of priority
to Korean Patent Application No. 2020-0083066 filed on
July 6, 2020, Korean Patent Application No. 2020-0089135
filed on July 17, 2020, and Korean Patent Application No.
2020-0090272 filed on July 21, 2020, the disclosures of
which are incorporated herein by reference in their
entireties.
[2] The present invention relates to an all-solidstate battery and a method of manufacturing the same.
More particularly, the present invention relates to an
electrode including a porous support and a conductive
coating layer formed on the porous support, an allsolid-state battery including the electrode, and a method
of manufacturing the same.
【Background Art】
[3] A lithium ion secondary battery, which has high
energy density, a low self-discharge rate, and a long
lifespan, is suitable for a high-capacity battery. A
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liquid electrolyte of the lithium ion secondary battery
has a problem of low safety in terms of liquid leakage
and overheating, and therefore an all-solid-state battery
has been suggested as a solution for solving such a
problem. The all-solid-state battery may have a solid
electrolyte layer including a solid electrolyte, unlike
the conventional lithium ion secondary battery. The
solid electrolyte layer is disposed between a positive
electrode and a negative electrode in order to further
perform the function of a separator.
[4] Since the all-solid-state battery uses a solid
electrolyte instead of a liquid electrolyte, there is no
electrolyte evaporation due to temperature change or
there is no liquid leakage due to external impact. As a
result, the all-solid-state battery has an advantage in
that the all-solid-state battery is safe from explosion
and fire. Since the all-solid-state battery does not
require parts configured to prevent liquid leakage and
explosion, the weight and volume of the all-solid-state
battery are reduced.
[5] The portion of the solid electrolyte that
contacts the positive electrode or the negative electrode
is limited, whereby the contact area of the solid
electrolyte is small, and it is not easy to form
interfaces between the positive electrode and the solid
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electrolyte layer and between the negative electrode and
the solid electrolyte layer. In the case in which it is
not easy to form interfaces between the solid electrolyte
layer and the positive electrode and between the solid
electrolyte layer and the negative electrode, electrical
resistance is high and output is reduced. In order to
solve these problems, in unit cells each including the
solid electrolyte, the positive electrode, the solid
electrolyte layer, and the negative electrode are stacked
and pressurized to reduce interfacial resistance.
[6] The all-solid-state battery, which has improved
safety, still has a problem due to lithium dendrites.
While the all-solid-state battery is pressurized and
charged and discharged, lithium dendrites may grow. The
solid electrolyte layer is damaged or the volume of the
battery is increased due to lithium dendrites.
[7] Such a problem due to lithium dendrites is a
problem still to be solved for the all-solid-state
battery as well as the conventional lithium ion secondary
battery.

【CLAIMS】
【Claim 1】 An electrode comprising:
a porous support; and
a conductive coating layer formed on at least one
surface of the porous support.
【Claim 2】 The electrode according to claim 1,
wherein the electrode is a negative electrode or a
positive electrode.
【Claim 3】 The electrode according to claim 1,
wherein the porous support comprises an elastic material.
【Claim 4】 The electrode according to claim 1,
wherein the porous support has a plurality of pores.
【Claim 5】 The electrode according to claim 3,
wherein the porous support is a porous polymer film or
porous polymer non-woven fabric that has a plurality of
pores and is elastically deformable.
【Claim 6】 The electrode according to claim 1,
wherein the porous support comprises a sheet or non-woven
fabric made of a polyolefin-based porous substrate or at
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least one selected from the group consisting of glass
fiber and polyethylene.
【Claim 7】 The electrode according to claim 1,
wherein the porous support further comprises at least one
of ceramics, metal, or a metal alloy in a polymer having
a porous structure.
【Claim 8】 The electrode according to claim 1,
wherein the porous support is uniaxially or biaxially
oriented.
【Claim 9】 The electrode according to claim 1,
wherein the porous support has a porosity of 10% to 90%,
preferably 35% to 85%.
【Claim 10】 The electrode according to claim 1,
wherein the porous support comprises pores each having a
diameter of 0.01 μm to 10 μm.
【Claim 11】 The electrode according to claim 1,
wherein the porous support has a pressurization-based
elastic strain of 30% or less, the pressurization-based
elastic strain being calculated as (thickness before
pressurization – thickness under 20 MPa
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pressurization)/thickness before pressurization x 100%.
【Claim 12】 The electrode according to claim 1,
wherein the porous support has a pressurization-based
thickness retention rate of 70% or more, the
pressurization-based thickness retention rate being
calculated as (thickness after pressurization/thickness
before pressurization) x 100%.
【Claim 13】 The electrode according to claim 1,
wherein the porous support has a thickness of 5 μm to 300
μm.