ૺDESCRIPTIONૻ
ૺInvention Titleૻ
ALL-SOLID-STATE BATTERY INCLUDING THIN FILM CURRENT
COLLECTOR AND METHOD OF MANUFACTURING THE SAME
ૺTechnical Fieldૻ
[1] This application claims the benefit of priority
to Korean Patent Application No. 2020-0091625 filed on
July 23, 2020, the disclosure of which is incorporated
herein by reference in its entirety.
[2] The present invention relates to an all-solidstate battery including a thin film current collector and
a method of manufacturing the same. More particularly,
the present invention relates to an all-solid-state
battery including a thin film current collector, wherein
interfacial resistance between the current collector and
a solid electrolyte is reduced while the overall capacity
of the all-solid-state battery is increased as the result
of using the thin film current collector, and a method of
manufacturing the same.
ૺBackground Artૻ
[3] The lifespan of a secondary battery using an
electrolytic solution is reduced due to consumption of
the electrolytic solution during charging and discharging,
2
or the secondary battery overheats or explodes due to
leakage or combustion of the electrolytic solution.
[4] In order to improve safety of the secondary
battery, various methods, such as provision of a safety
device, such as a fuse or a protection circuit, have been
considered. In order to solve the above problems, an
all-solid-state battery using a solid electrolyte instead
of a liquid electrolytic solution has been proposed.
[5] Unlike the conventional secondary battery, the
all-solid-state battery is configured such that a
positive electrode and a negative electrode are formed on
opposite surfaces of a solid electrolyte layer including
the solid electrolyte and the solid electrolyte layer
also serves as a separator.

ૺCLAIMSૻ
ૺClaim 1ૻ An all-solid-state battery comprising:
a positive electrode;
a solid electrolyte layer; and
a negative electrode,
wherein the positive electrode or the negative
electrode comprises a current collector having a
thickness of less than 5 μm, and
wherein the current collector directly faces the
solid electrolyte layer.
ૺClaim 2ૻ The all-solid-state battery according to
claim 1, wherein the current collector comprises a metal
with high affinity for lithium.
ૺClaim 3ૻ The all-solid-state battery according to
claim 2, wherein the metal with high affinity for
lithium is at least one selected from the group
consisting of metals, comprising Au, Ag, Pt, Zn, Si and
Mg, and metal oxides, comprising CuO, ZnO, CoO and MnO.
ૺClaim 4ૻ The all-solid-state battery according to
claim 1, wherein the current collector does not comprise
lithium metal.
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ૺClaim 5ૻ The all-solid-state battery according to
claim 1, wherein the current collector is thermally
treated together with the solid electrolyte layer.
ૺClaim 6ૻ The all-solid-state battery according to
claim 1, wherein the current collector is formed through
a deposition and transfer process.
ૺClaim 7ૻ The all-solid-state battery according to
claim 1, wherein the all-solid-state battery does not use
lithium, like a nickel-cadmium battery, a nickelmanganese battery, a nickel-hydride battery, or a metalair battery.
ૺClaim 8ૻ A method of manufacturing the all-solidstate battery according to any one of claims 1 to 7, the
method comprising:
S1) depositing a metal for current collectors on a
release film to form a current collector; and
S2) transferring the current collector of step S1)
to a solid electrolyte layer and performing heat
treatment to form an electrode assembly.
ૺClaim 9ૻ The method according to claim 8,
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comprising removing the release film after step S2) or
before heat treatment of step S2).
ૺClaim 10ૻ The method according to claim 8, wherein,
in step S2), transferring and performing heat treatment
are simultaneously performed.