【Technical Field】
The present application claims the benefits of priority based on Korean
Patent Application No. 10-2021-0092060 filed on July 14, 2021, the entire
contents of which are incorporated herein by reference.
The present invention relates to a non-aqueous electrolyte solution and a
lithium secondary battery including the same, and in particular, to a non-aqueous
electrolyte solution capable of enhancing quick charging performance and
resistance properties of a secondary battery, and a lithium secondary battery
including the same.
【Background Art】
A lithium secondary battery is generally manufactured by forming an
electrode assembly through providing a separator between a positive electrode
including a positive electrode active material formed with a lithium-containing
transition metal oxide and a negative electrode including a negative electrode
active material capable of storing lithium ions, inserting the electrode assembly to
a battery case, injecting a non-aqueous electrolyte solution that is a medium
transferring lithium ions thereto, and then sealing the result.
Such a lithium secondary battery is used in electric vehicles and the like as
well as in portable electronic devices such as mobile phones or notebook
computers, and demands thereon is rapidly increasing. As demands for a lithium
secondary battery increases and subject of application becomes diverse, a level
of performance required for a lithium secondary battery is gradually increasing as
well. For example, high energy density, high output properties, and durability
usable for a long period of time under a harsh condition are required for a lithium
secondary battery used for electrical vehicles. In addition thereto, demands for
2
quick charging performance capable of charging a battery in a short period of time
is also increasing recently.
However, lithium secondary batteries that have been developed so far do
not have sufficient quick charging performance, and, even when quick charge is
possible, have a problem of rapidly declining battery performance when quick
charge is repeated.
[Prior Art Documents]
[Patent Documents]
(Patent Document 1) Korean Laid-open Patent Publication No. 2019-
0008100
(Patent Document 2) International Publication No. 2015-093091
【Disclosure】
【Technical Problem】
One embodiment of the present invention has been made to resolve such
problems, and is directed to providing a non-aqueous electrolyte solution capable
of enhancing quick charging performance and output properties of a lithium
secondary battery, and a lithium secondary battery including the same.
【Technical Solution】
In order to achieve the above objects, one embodiment of the present
invention provides a non-aqueous electrolyte solution for a lithium secondary
battery, including a lithium salt, an organic solvent and a compound represented
by the following Formula 1 as a first additive.
[Formula 1]
In Formula 1 above,
R1 and R2 are the same as or different from each other, and are each
independently a substituted or unsubstituted C1 to C10 alkyl group; a substituted
or unsubstituted C2 to C10 alkenyl group; a substituted or unsubstituted C2 to
3
C10 alkynyl group; a substituted or unsubstituted C6 to C20 aryl group; or a
substituted or unsubstituted C1 to C10 trialkylsiloxy group.
In addition, one embodiment of the present invention provides the nonaqueous electrolyte solution for a lithium secondary battery, in which R1 and R2 in
Formula 1 above are the same as or different from each other, and are each
independently a substituted or unsubstituted C1 to C10 alkyl group; or a
substituted or unsubstituted C1 to C10 trialkylsiloxy group.
In addition, one embodiment of the present invention provides the nonaqueous electrolyte solution for a lithium secondary battery, in which R1 and R2 in
Formula 1 above are substituted with a substituted or unsubstituted C3 to C10
trialkylsiloxy group.
In addition, one embodiment of the present invention provides the nonaqueous electrolyte solution for a lithium secondary battery, in which the
compound represented by Formula 1 is a compound represented by any one of
the following Formula 1-1 to Formula 1-7.
[Formula 1-1]
[Formula 1-2]
[Formula 1-3]
4
[Formula 1-4]
[Formula 1-5]
[Formula 1-6]
[Formula 1-7]
In addition, one embodiment of the present invention provides the nonaqueous electrolyte solution for a lithium secondary battery, in which the first
additive is included in an amount of 0.01% by weight to 10% by weight with
respect to a total weight of the electrolyte solution.

【Claim 1】
A non-aqueous electrolyte solution for a lithium secondary battery,
comprising:
a lithium salt;
an organic solvent; and
a compound represented by the following Formula 1 as a first additive:
[Formula 1]
wherein, in Formula 1,
R1 and R2 are the same as or different from each other, and are each
independently a substituted or unsubstituted C1 to C10 alkyl group; a substituted
or unsubstituted C2 to C10 alkenyl group; a substituted or unsubstituted C2 to
C10 alkynyl group; a substituted or unsubstituted C6 to C20 aryl group; or a
substituted or unsubstituted C1 to C10 trialkylsiloxy group.
【Claim 2】
The non-aqueous electrolyte solution for a lithium secondary battery
according to claim 1, wherein R1 and R2 are the same as or different from each
other, and are each independently a substituted or unsubstituted C1 to C10 alkyl
group; or a substituted or unsubstituted C1 to C10 trialkylsiloxy group.
【Claim 3】
The non-aqueous electrolyte solution for a lithium secondary battery
according to claim 1, wherein R1 and R2 are substituted with a substituted or
unsubstituted C3 to C10 trialkylsiloxy group.
【Claim 4】
27
The non-aqueous electrolyte solution for a lithium secondary battery
according to claim 1, wherein the compound represented by Formula 1 is a
compound represented by any one of Formula 1-1 to Formula 1-7:
[Formula 1-1]
[Formula 1-2]
[Formula 1-3]
[Formula 1-4]
[Formula 1-5]
28
[Formula 1-6]
[Formula 1-7]
.
【Claim 5】
The non-aqueous electrolyte solution for a lithium secondary battery
according to claim 1, wherein the first additive is included in an amount of 0.01%
by weight to 10% by weight with respect to the total weight of the non-aqueous
electrolyte solution.