Lithium ion battery and cathode active material therefor

Patent metadata

Field	Value
Publication number	US-11489150-B2
Application number	US-201916444023-A
Country	US
Kind code	B2
Filing date	Jun 18, 2019
Priority date	Jun 27, 2018
Publication date	Nov 1, 2022
Grant date	Nov 1, 2022

Abstract

Certain embodiments of the disclosure relate to a bimodal-type cathode active material for a lithium ion battery. The cathode active material includes a mixture of layered LiCoO2 large particles and manganese-based olivine structural small particles. The manganese-based olivine structural small particles may be represented by chemical formula LiCoxMnyFezPO4 (0≤x≤1, 0<y≤1, 0≤z≤1, x+y+z=1). An average particle diameter of the large particles may be 16 to 25 μm, and an average particle diameter of the small particles may be 1 to 3 μm. The cathode active material of the disclosure can achieve high energy density and high voltage stability.

First claim

What is claimed is:

1. A bimodal-type cathode active material for a lithium ion battery, comprising:
a mixture of layered LiCoO 2 large particles and manganese-based olivine structural small particles,
wherein the manganese-based olivine structural small particles are represented by chemical formula LiCo x Mn y Fe z PO 4 (0.1≤x≤0.4, 0.2≤y≤0.8, 0.1≤z≤0.6, and x+y+z=1),
wherein an average particle diameter of the large particles is 16 to 25 μm, and an average particle diameter of the small particles is 1 to 3 μm,
wherein the large particles are surface-coated with Al 2 O 3 ,
wherein the manganese-based olivine structural small particles are secondary particles made from aggregation of primary particles having an average thickness of about 100 nm or less, and
wherein the secondary particles have a spherical or plate-like mesocrystal aggregate structure.

2. The cathode active material of claim 1 , wherein in the chemical formula LiCo x Mn y Fe z PO 4 of the manganese-based olivine structural small particles, 0.7≤y≤0.8.

3. The cathode active material of claim 1 , wherein the secondary particles are formed using a solvothermal synthesis technique.

4. The cathode active material of claim 1 , wherein surfaces of the secondary particles are coated with a carbon-based material.

5. The cathode active material of claim 1 , wherein a mixing ratio of the large particles to the small particles is 80:20 to 99:1 by weight.

6. The cathode active material of claim 1 , wherein the cathode active material has an operating voltage ranging from 3.0 V to 4.5 V.

7. The cathode active material of claim 1 , wherein the cathode active material has a rolling density of 3.8 to 4.4 g/cc.

8. A lithium ion battery comprising a bimodal-type cathode active material including a mixture of layered LiCoO 2 large particles and manganese-based olivine structural small particles,
wherein the manganese-based olivine structural small particles are represented by chemical formula LiCo x Mn y Fe z PO 4 (0.1≤x≤0.4, 0.2≤y≤0.8, 0.1≤z≤0.6, and x+y+z=1),
wherein an average particle diameter of the large particles is 16 to 25 μm, and an average particle diameter of the small particles is 1 to 3 μm,
wherein the large particles are surface-coated with Al 2 O 3 ,
wherein the manganese-based olivine structural small particles are secondary particles made from aggregation of primary particles having an average thickness of about 100 nm or less, and
wherein the secondary particles have a spherical or plate-like mesocrystal aggregate structure.

9. An electronic device comprising a lithium ion battery used as a battery module, comprising a bimodal-type cathode active material including a mixture of layered LiCoO 2 large particles and manganese-based olivine structural small particles,
wherein the manganese-based olivine structural small particles are represented by chemical formula LiCo x Mn y Fe z PO 4 (0.1≤x≤0.4, 0.2≤y≤0.8, 0.1≤z≤0.6, and x+y+z=1),
wherein an average particle diameter of the large particles is 16 to 25 μm, and an average particle diameter of the small particles is 1 to 3 μm,
wherein the large particles are surface-coated with Al 2 O 3 ,
wherein the manganese-based olivine structural small particles are secondary particles made from aggregation of primary particles having an average thickness of about 100 nm or less, and
wherein the secondary particles have a spherical or plate-like mesocrystal aggregate structure.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Wi Sungun
• Oh Bookeun
• Lee Jaeyeon
• Choi Jaeman

Classifications

• H01M4/364 Primary

  as mixtures · CPC title

• C01B25/45

  containing plural metal, or metal and ammonium · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2004/021

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