Non-aqueous electrolyte and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-12119450-B2
Application number	US-202017614041-A
Country	US
Kind code	B2
Filing date	Aug 25, 2020
Priority date	Aug 30, 2019
Publication date	Oct 15, 2024
Grant date	Oct 15, 2024

Abstract

A non-aqueous electrolyte and a lithium secondary battery including the same are disclosed herein. In some embodiments, a non-aqueous electrolyte includes an organic solvent, a lithium salt, and an additive, wherein the additive includes a compound represented by Formula I and a compound represented by Formula II

wherein, in Formula I, R 1 is an alkylene group having 1 to 4 carbon atoms, and wherein, in Formula II, R 2 , R 3 , and R 4 are each independently a fluorine atom or a fluorine-substituted alkyl group having 1 to 10 carbon atoms.

First claim

The invention claimed is:

1. A non-aqueous electrolyte, comprising:
an organic solvent;
a lithium salt; and
an additive,
wherein the additive comprises a compound represented by Formula I and a compound represented by Formula II

wherein, in Formula I, R 1 is an alkylene group having 1 to 4 carbon atoms

wherein, in Formula II, R 2, R 3, and R 4 are each independently a fluorine atom or a fluorine-substituted alkyl group having 1 to 10 carbon atoms, and
wherein the additive further comprises a silane-based compound.

2. The non-aqueous electrolyte of claim 1 , wherein the compound represented by Formula I is a compound represented by Formula I-1

3. The non-aqueous electrolyte of claim 1 , wherein the compound represented by Formula II is a compound represented by Formula II-1

4. The non-aqueous electrolyte of claim 1 , wherein the compound represented by Formula I is present in an amount of 0.5 wt % to 2 wt % based on a total weight of the non-aqueous electrolyte.

5. The non-aqueous electrolyte of claim 1 , wherein the compound represented by Formula II is present in an amount of 0.5 wt % to 2 wt % based on a total weight of the non-aqueous electrolyte.

6. A lithium secondary battery, comprising:
a positive electrode including a positive electrode active material;
a negative electrode including a negative electrode active material;
a separator disposed between the negative electrode and the positive electrode; and
the non-aqueous electrolyte of claim 1 .

7. The lithium secondary battery of claim 6 , wherein the positive electrode active material is a lithium composite transition metal oxide having an amount of nickel of 50 atm % or more, based on the total amount of transition metals in the lithium composite transition metal oxide.

8. The lithium secondary battery of claim 6 , wherein the positive electrode active material is a lithium composite transition metal oxide represented by Formula III
Li x [Ni y Co z Mn w M 1 v ]O 2-p A p   [Formula III]

wherein, in Formula III,
M 1 comprises at least one of tungsten (W), copper (Cu), iron (Fe), vanadium (V), chromium (Cr), titanium (Ti), zirconium (Zr), zinc (Zn), aluminum (Al), indium (In), tantalum (Ta), yttrium (Y), lanthanum (La), strontium (Sr), gallium (Ga), scandium (Sc), gadolinium (Gd), samarium (Sm), calcium (Ca), cerium (Ce), niobium (Nb), magnesium (Mg), boron (B), or molybdenum (Mo),
A comprises at least one of fluorine (F), chlorine (C1), bromine (Br), iodine (I), astatine (At), or sulfur(S), and
0.8≤x≤1.2, 0.5≤y<1, 0<z<0.5, 0<w<0.5, 0≤v≤0.2, and 0≤p≤0.2.

9. The lithium secondary battery of claim 6 , wherein the negative electrode active material comprises a carbon-based negative electrode active material, a silicon-based negative electrode active material, or a mixture thereof.

10. The lithium secondary battery of claim 6 , wherein the negative electrode active material comprises a silicon-based negative electrode active material.

Assignees

• Lg Energy Solution Ltd

Inventors

• Oh Jeong Woo
• Kim Hyung Tae
• Lee Chul Haeng

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title