Lithium secondary battery

Patent metadata

Field	Value
Publication number	US-12095084-B2
Application number	US-202318129388-A
Country	US
Kind code	B2
Filing date	Mar 31, 2023
Priority date	May 11, 2018
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

A lithium secondary battery is disclosed herein. In some embodiments, a lithium battery includes a positive electrode having a lithium-nickel-cobalt-manganese-based electrode active material wherein nickel has a content of 80 mol % or greater, relative to the other transition metals, a negative electrode including a silicon-based negative electrode active material, a separator, and a non-aqueous electrolyte solution including a non-aqueous organic solvent and a lithium salt, the lithium salt being contained in a concentration of 1.8 M to 5 M, and wherein the lithium salt includes LiPF6 and a lithium bis(fluorosulfonyl)imide.

First claim

The invention claimed is:

1. A lithium secondary battery comprising:
a positive electrode comprising a positive electrode active material represented by Formula 1;
a negative electrode comprising a silicon-based negative electrode active material;
a separator; and
a non-aqueous electrolyte solution,
wherein the non-aqueous electrolyte solution comprises a non-aqueous organic solvent and a lithium salt, wherein, when the non-aqueous organic solvent includes a cyclic carbonate-based solvent, the cyclic carbonate-base solvent is present at 1 vol % to 20 vol % relative to a total volume of the non-aqueous organic solvent,
wherein the lithium salt is present in a concentration of 1.8 M to 5 M in the non-aqueous electrode solution, and
wherein the lithium salt comprising LiPF 6 , and lithium bis(fluorosulfonyl)imide, and the LiPF 6 and the lithium bis(fluorosulfonyl)imide are present in a weight ratio between 1:9 and 5:5,
Li 1+x [Ni a Co b Mn c M d ]O 2   [Formula 1]

wherein, 0≤x<1, 0.8≤a<1, 0<b<0.2, 0<c<0.2, 0≤d<0.2, and M is at least one of W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, Ta, Y, In, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, or Mo.

2. The lithium secondary battery of claim 1 ,
wherein the lithium salt is present in a concentration of 2 M to 5 M in the non-aqueous electrolyte solution.

3. The lithium secondary battery of claim 1 ,
wherein the LiPF 6 and the lithium bis(fluorosulfonyl)imide are present in a weight ratio between 2:8 and 5:5.

4. The lithium secondary battery of claim 1 ,
wherein the silicon-based negative electrode active material comprises at least one of a metal silicon (Si), a silicon oxide (SiO y ), where O<y<2, a silicon carbide (SiC), or an Si—Y alloy, where Y is at least one of an alkali metal, an alkaline earth metal, a Group 13 element, a Group 14 element, a transition metal, or a rare earth metal, and wherein Y excludes Si.

5. The lithium secondary battery of claim 1 ,
wherein the negative electrode further comprises a carbon-based negative electrode active material.

6. The lithium secondary battery of claim 5 ,
wherein the silicon-based negative electrode active material and the carbon-based negative electrode active material are present in a weight ratio between 1:99 and 50:50.

7. The lithium secondary battery of claim 1 ,
wherein the non-aqueous organic solvent comprises at least one of a cyclic carbonate-based solvent, a linear carbonate-based solvent, an ester-based solvent, or an ether-based solvent.

Assignees

• Lg Energy Solution Ltd

Inventors

• Shin Won Kyung
• Ahn Kyoung Ho
• Lee Chul Haeng
• Oh Jeong Woo
• Kim Min Jung

Classifications

• H01M4/58

  of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates · CPC title

• H01M4/483

  for non-aqueous cells (H01M4/485 takes precedence) · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/364 Primary

  as mixtures · CPC title