Cathode active material and secondary battery using same

Patent metadata

Field	Value
Publication number	US-2020381721-A1
Application number	US-202016846444-A
Country	US
Kind code	A1
Filing date	Apr 13, 2020
Priority date	May 30, 2019
Publication date	Dec 3, 2020
Grant date	—

Abstract

Provides is a cathode active material comprising particles each containing a lithium composite oxide, a coating layer containing an ammonium phosphate compound containing a metal other than lithium. The coating layer coats each of the particles. The metal other than lithium includes at least one selected from the group consisting of manganese, nickel, and cobalt.

First claim

1 . A cathode active material comprising:
particles each containing a lithium composite oxide; and a coating layer containing an ammonium phosphate compound containing a metal other than lithium, wherein each of the particles is coated with the coating layer; and the metal other than the lithium includes at least one selected from the group consisting of manganese, nickel, and cobalt.

2 . The cathode active material according to claim 1 , wherein
a weight ratio of the ammonium phosphate compound to the lithium composite oxide is not less than 1.0 wt % and not more than 2.0 wt %.

3 . The cathode active material according to claim 1 , wherein
the lithium composite oxide includes at least one selected from the group consisting of nickel, cobalt, and manganese.

4 . The cathode active material according to claim 1 , wherein
the lithium composite oxide has a crystal structure which belongs to a space group R-3m or C2/m.

5 . A secondary battery, comprising:
a cathode comprising the cathode active material according to claim 1 ; an anode comprising an anode active material capable of occluding and releasing lithium ions; and a non-aqueous electrolyte containing a non-aqueous solvent and a lithium salt which has been dissolved in the non-aqueous solvent.

6 . A secondary battery, comprising:
a cathode containing a cathode mixture layer containing a cathode current collector and the cathode active material according to claim 1 ; an anode comprising an anode current collector; and a non-aqueous electrolyte containing a non-aqueous solvent and a lithium salt which has been dissolved in the non-aqueous solvent, wherein during charge, a lithium metal is deposited on the anode current collector; and during discharge, the lithium metal is dissolved in the non-aqueous electrolyte.

7 . The secondary battery according to claim 5 , wherein
the lithium salt contains at least one selected from the group consisting of LiBF 4 , LiPF 6 , LiN(SO 2 CF 3 ) 2 , LiN(SO 2 F) 2 , a lithium bis(oxalate) borate, and a lithium difluoro(oxalate) borate.

8 . The secondary battery according to claim 6 , wherein
the lithium salt contains at least one selected from the group consisting of LiBF 4 , LiPF 6 , LiN(SO 2 CF 3 ) 2 , LiN(SO 2 F) 2 , a lithium bis(oxalate) borate, and a lithium difluoro(oxalate) borate.

9 . The secondary battery according to claim 5 , wherein
the lithium salt in the non-aqueous electrolyte has a concentration of not less than 0.5 mol/L and not more than 3.5 mol/L.

10 . The secondary battery according to claim 6 , wherein
the lithium salt in the non-aqueous electrolyte has a concentration of not less than 0.5 mol/L and not more than 3.5 mol/L.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Suzuki Hirotetsu

Classifications

• H01M10/0525

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

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/628 Primary

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

• H01M2004/021

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

• H01M2004/028

  Positive electrodes · CPC title