Additive for Positive Electrode of Lithium Secondary Battery, Method for Manufacturing Same, and Lithium Secondary Battery Comprising Same

Patent metadata

Field	Value
Publication number	US-2024014399-A1
Application number	US-202118022834-A
Country	US
Kind code	A1
Filing date	Nov 18, 2021
Priority date	Nov 26, 2020
Publication date	Jan 11, 2024
Grant date	—

Abstract

An additive for a positive electrode of a lithium secondary battery, the additive including a lithium transition metal oxide, Li3PO4, Li5AlO4 and Li3BO3. The lithium transition metal oxide has an aluminum-doped form. The additive including Li3PO4, Li5AlO4 and Li3BO3 together with the lithium transition metal oxide has functionality of improving stability of a battery when used in a positive electrode of a lithium secondary battery. The Li3PO4, the Li5AlO4 and the Li3BO3 are evenly mixed with the lithium transition metal oxide or some thereof form a partial coating layer, or a portion of aluminum is doped to the lithium transition metal oxide to suppress the lithium transition metal oxide from causing a side reaction with an electrolyte liquid.

First claim

1 . An additive for a positive electrode of a lithium secondary battery, the additive comprising:
a lithium transition metal oxide; Li 3 PO 4 ; Li 5 AlO 4 ; and Li 3 BO 3 , wherein the lithium transition metal oxide has an aluminum-doped form.

2 . The additive of claim 1 , wherein the lithium transition metal oxide is represented by Chemical Formula 1:
Li 2 Ni 1-x Al x O 2   [Chemical Formula 1]
wherein x is from 0.001 to 0.005.

3 . The additive of claim 1 , wherein the lithium transition metal oxide is included in an amount of 75% by weight to 90% by weight based on a total weight of the additive.

4 . The additive of claim 1 , wherein the Li 3 PO 4 is included in an amount of 1% by weight to 10% by weight based on a total weight of the additive.

5 . The additive of claim 1 , wherein the Li 5 AlO 4 is included in an amount of 0.5% by weight to 5% by weight based on a total weight of the additive.

6 . The additive of claim 1 , wherein the Li 3 BO 3 is included in an amount of 0.1% by weight to 3% by weight based on a total weight of the additive.

7 . The additive of claim 1 , wherein a portion of the Li 3 BO 3 is configured to be coated on the lithium transition metal oxide.

8 . The additive of claim 2 , wherein the additive further includes NiO.

9 . The additive of claim 8 , wherein the NiO is included in an amount of 5% by weight to 15% by weight based on a total weight of the additive.

10 . A method for preparing the additive of claim 1 , the method comprising:
(1) mixing a transition metal source material, a lithium source material, a phosphorous source material, an aluminum source material and a boron source material to prepare a mixture; and (2) heat treating the mixture.

11 . The method for preparing the additive of claim 10 , wherein, in the mixing, the transition metal source material is NiO, the lithium source material is Li 2 O, LiOH or Li 2 CO 3 , the phosphorous source material is (NH 4 ) 2 HPO 4 , the aluminum source material is Al(OH) 3 and the boron source material is B(OH) 3 .

12 . The method for preparing the additive of claim 10 , wherein, in the heat treating, the mixture is heat treated for 10 hours to 32 hours at 300° C. to 700° C.

13 . A positive electrode of a lithium secondary battery, the positive electrode comprising:
the additive of claim 1 ; and a positive electrode active material, wherein the additive is included in an amount of 10 parts by weight to 40 parts by weight based on 100 parts by weight of the positive electrode active material.

Assignees

• Lg Energy Solution Ltd

Inventors

• Jung Hae Jung
• Lee Boram
• Yoo Tae Gu
• Jung Wang Mo
• Park Byungchun

Classifications

• H01M4/628 Primary

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

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• C01B25/30 Primary

  Alkali metal phosphates · CPC title

• C01B35/12

  Borates {(C01B35/1063 takes precedence)} · CPC title