Lithium Secondary Battery

Patent metadata

Field	Value
Publication number	US-2020321615-A1
Application number	US-201916956263-A
Country	US
Kind code	A1
Filing date	May 10, 2019
Priority date	May 11, 2018
Publication date	Oct 8, 2020
Grant date	—

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

1 . A lithium secondary battery comprising:
a positive electrode having a lithium nickel cobalt manganese-based positive electrode active material, a content of the nickel in the positive electrode active material is 80 mol % or greater, based on the total content of transition metals in the positive electrode active material; a negative electrode having a silicon-based negative electrode active material; a separator; and a non-aqueous electrolyte solution, wherein the non-aqueous electrolyte solution having a non-aqueous organic solvent and a lithium salt, 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 a lithium bis(fluorosulfonyl)imide.

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 LiPF 6 and the lithium bis(fluorosulfonyl)imide are present in a weight ratio between 1:9 and 5:5.

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

5 . The lithium secondary battery of claim 1 ,
wherein the positive electrode active material is represented by Formula 1 below:
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 element selected from the group consisting of W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, Ta, Y, In, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo.

6 . The lithium secondary battery of claim 1 ,
wherein the silicon-based negative electrode active material comprises at least one selected from the group consisting of a metal silicon (Si), a silicon oxide (SiO y ), where 0<y<2, a silicon carbide (SiC) and an Si—Y alloy, where Y is an element selected from the group consisting of an alkali metal, an alkaline earth metal, a Group 13 element, a Group 14 element, a transition metal, a rare earth metal, and a combination thereof, and wherein Y excludes Si.

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

8 . The lithium secondary battery of claim 7 ,
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.

9 . The lithium secondary battery of claim 1 ,
wherein the non-aqueous organic solvent comprises at least one selected from the group consisting of a cyclic carbonate-based solvent, a linear carbonate-based solvent, an ester-based solvent, and an ether-based solvent.

10 . The lithium secondary battery of claim 9 ,
wherein the non-aqueous organic solvent comprises the cyclic carbonate-based solvent in an amount of 20 vol % or less, based on the total volume of the non-aqueous organic solvent.

Assignees

• Lg Chemical Ltd

Inventors

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

Classifications

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• 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