Additive for cathode, method for preparing the same, cathode including the same, and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-10930935-B2
Application number	US-201816201229-A
Country	US
Kind code	B2
Filing date	Nov 27, 2018
Priority date	Nov 30, 2017
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

Disclosed are a cathode additive of a lithium secondary battery which may have improved crystallinity and a method for preparing the same. The cathode additive may be provided to suppress generation of oxygen gas or gelation of an electrode slurry composition, which may occur due to reduction in the content of residual by-products containing lithium oxide.

First claim

The invention claimed is:

1. A cathode additive for a lithium secondary battery, comprising a composite comprising (Li 6 Co 1-x M x O 4 ) and (Li a M b O c ), wherein M comprises one or more elements selected from the group consisting of P, B, F, W, and Zr;
0.1 ≤a≤ 6, 1 ≤b≤ 5, 1 ≤c≤ 8; and
0≤ x< 1.0;

wherein the composite is present in a form of a single particulate or a complex.

2. The cathode additive of claim 1 , wherein the composite is represented by the following Chemical Formula 1: [Chemical Formula 1] y(Li 6 Co1-xM x O 4 )-z(Li a M b O c ) wherein y and z are molar ratios of Li 6 Co 1-x M x O 4 and Li a M b O c contained in the composite of Chemical Formula 1, and y:z is about 2:1 to 60:1, each of a, b and c is independently an integer of 1 or greater, and is determined within a range satisfying the following Equation 1: [Equation 1] (oxidation number of Li×a)+(oxidation number of element M×b)+(oxidation number of O×c)=0.

3. The cathode additive of claim 1 , wherein the composite comprises the Li 6 Co 1-x M x O 4 and the Li a M b O c physically mixed and attached to each other.

4. The cathode additive of claim 1 , wherein the composite has a second peak at 2Θ of 22.42±0.50°, 24.84±0.5° or 34.88±0.5° in XRD (X-ray diffraction) analysis by Cu Kα X-ray (X-rα), and
an intensity of the second peak is about 10% or less based on an intensity of a first peak at 2Θ of 23.5±0.5°.

5. The cathode additive of claim 1 , wherein the composite further comprises Li 2 O in an amount of about 5 wt % or less based on the total amount of the composite.

Assignees

• Lg Chemical Ltd

Inventors

• Jeon Hyelim
• Lee Donghun
• Lee Sang Wook
• Kim Seul Ki
• Lho Eunsol
• Jung Wang Mo

Classifications

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M4/364 Primary

  as mixtures · CPC title

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/628 Primary

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · CPC title