Method for preparing positive electrode additive for lithium secondary battery, and positive electrode additive for lithium secondary battery prepared thereby

Patent metadata

Field	Value
Publication number	US-12327858-B2
Application number	US-201917252610-A
Country	US
Kind code	B2
Filing date	Oct 15, 2019
Priority date	Oct 18, 2018
Publication date	Jun 10, 2025
Grant date	Jun 10, 2025

Abstract

The present disclosure relates to a method for preparing a positive electrode additive for a lithium secondary battery having a high irreversible capacity and being capable of preventing gelation and reducing gas generation, and a positive electrode additive prepared thereby. The method for preparing the positive electrode additive includes the steps of: mixing a lithium raw material, a nickel raw material and, optionally, a raw material containing an element M, and then heat-treating the mixture, thereby preparing a predetermined lithium nickel oxide, wherein the lithium raw material includes Li 2 O and LiOH, and the LiOH is used in an amount of 5 to 10% by weight with respect to the total weight of the lithium raw material.

First claim

The invention claimed is:

1. A method for preparing a positive electrode additive for a lithium secondary battery, the method comprising the steps of:
mixing a lithium raw material, a nickel raw material and, optionally, a raw material containing an element M, and
heat-treating the mixed raw materials to produce the lithium nickel oxide additive of Chemical Formula 1 below,
wherein the lithium raw material includes Li 2 O and LiOH,
the LiOH is present in an amount of 3 to 25% by weight with respect to the total weight of the lithium raw material,
the lithium raw material is composed of 80 to 92 mol % of Li 2 O, and 8 to 20 mol % of LiOH:
Li 2 Ni 1-x M x O 2   [Chemical Formula 1]

in Chemical Formula 1,
M is selected from the group consisting of a transition metal, an amphoteric element, P, F, and B, provided that M is not nickel, and
0≤x<1.

2. The method for preparing a positive electrode additive for a lithium secondary battery according to claim 1 , wherein the nickel raw material includes NiO.

3. The method for preparing a positive electrode additive for a lithium secondary battery according to claim 1 , wherein the M is selected from the group consisting of W, Ti, Zr, Al, P, F, and B.

4. The method for preparing a positive electrode additive for a lithium secondary battery according to claim 1 , wherein the element M-containing raw material includes one or more selected from the group consisting of element M-containing: oxides, hydroxides, oxyhydroxides, sulfates, nitrates, acetates, carbonates, oxalates, citrates, halides, phosphates and their hydrates.

5. The method for preparing a positive electrode additive for a lithium secondary battery according to claim 1 , wherein the heat-treating step is carried out at a temperature of 500 to 900° C. for 5 to 25 hours.

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

• Lee Boram
• Park Sin Young
• Lee Daejin
• Kim Hakyoon
• Kim Taegon
• Jung Wang Mo

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/0525

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

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title