Negative electrode for lithium secondary battery and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-2023178721-A1
Application number	US-202117997354-A
Country	US
Kind code	A1
Filing date	Apr 27, 2021
Priority date	May 6, 2020
Publication date	Jun 8, 2023
Grant date	—

Abstract

The present invention relates to a negative electrode for a lithium secondary battery and a lithium secondary battery comprising same. The negative electrode for a lithium secondary battery comprise: a current collector; and a negative electrode active material layer formed on the current collector and comprising a, negative electrode active material, lithium titanium oxide, and a conductive material, wherein 2 wt % or less of lithium titanium oxide is contained relative to 100 wt % of the negative electrode active material layer.

First claim

1 . A negative electrode for a lithium secondary battery comprising:
a current collector; and a negative electrode active material layer formed on the current collector and comprising a negative electrode active material, lithium titanium oxide and a conductive material, wherein an amount of the lithium titanium oxide is 2 wt % or less relative to 100 wt % of the negative electrode active material layer.

2 . The negative electrode for a lithium secondary battery of claim 1 , wherein:
the conductive material is a particle-shaped carbon, a fiber-shaped carbon, or a combination thereof.

3 . The negative electrode for a lithium secondary battery of claim 2 , wherein the conductive material is denka black, carbon black, carbon nanotubes, carbon fiber, carbon nanowire, or a combination thereof.

4 . The negative electrode for a lithium secondary battery of claim 1 , wherein the particle-shaped carbon has a particle diameter of 5 nm to 700 nm.

5 . The negative electrode for a lithium secondary battery of claim 1 , wherein the fiber-shaped carbon has a length of 5 μm to 200 μm and a diameter of 20 nm or less.

6 . The negative electrode for a lithium secondary battery of claim 1 , wherein the amount of lithium titanium oxide is 0.001 wt % to 2 wt % relative to 100 wt % of the negative electrode active material layer.

7 . The negative electrode for a lithium secondary battery of claim 1 , wherein a total amount of lithium titanium oxide and the conductive material is 3.5 wt % or less relative to 100 wt % of the negative electrode active material layer.

8 . The negative electrode for a lithium secondary battery of claim 1 , wherein a mixing ratio of the lithium titanium oxide and the conductive material is 0.002:1 to 4:1 by weight ratio.

9 . The negative electrode for a lithium secondary battery of claim 1 , wherein lithium titanium oxide is represented by Chemical Formula 1.
Li 4+x Ti y M z O t   [Chemical Formula 1]
(in Chemical Formula 1, 0<x≤3, 1≤y≤5, 0≤z≤3, 3≤t≤12, and M is an element selected from Mg, La, Tb, Gd, Ce, Pr, Nd, Sm, Ba, Sr, Ca, or a combination thereof).

10 . The negative electrode for a lithium secondary battery of claim 1 , wherein:
the negative electrode active material is a carbon-based active material, a silicon-based active material, or a combination thereof.

11 . A lithium secondary battery, comprising
a negative electrode of claim 1 ; a positive electrode; and an electrolyte.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Jung Hyeseung
• Lee Jaeho
• Kim Soochan
• Cho Chaewoong

Classifications

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title