Positive electrode active material for a lithium ion secondary battery, method for manufacturing the same, and lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-2017271712-A1
Application number	US-201515517260-A
Country	US
Kind code	A1
Filing date	Sep 17, 2015
Priority date	Oct 7, 2014
Publication date	Sep 21, 2017
Grant date	—

Abstract

A positive electrode active material for a lithium ion secondary battery that can suppress gas generation and that can provide a lithium ion secondary battery having a high capacity retention ratio in charge-discharge cycles is provided. The positive electrode active material for a lithium ion secondary battery according to the present exemplary embodiment includes a compound having a layered rock salt structure and represented by Li x Fe s M 1 (z-s) M 2 y O δ (wherein 1.05≦x≦1.90, 0.05≦s≦0.50, 0.05≦z≦0.50, 0.33≦y≦0.90, 1.20≦δ≦3.10 and z−s≧0; M 1 is at least one element selected from the group consisting of Co and Ni; and M 2 is at least one element selected from the group consisting of Mn, Ti and Zr) and a specific 1,3-propanedione derivative.

First claim

1 . A positive electrode active material for a lithium ion secondary battery, comprising:
a compound having a layered rock salt structure and represented by formula (1) below:
Li x Fe s M 1 (z-s) M 2 y O δ   (1)

wherein 1.05≦x≦1.90, 0.05≦s≦0.50, 0.05≦z≦0.50, 0.33≦y≦0.90, 1.20≦δ≦3.10 and z−s≧0; M 1 is at least one element selected from the group consisting of Co and Ni; and M 2 is at least one element selected from the group consisting of Mn, Ti and Zr; and
a 1,3-propanedione derivative represented by formula (2) below:

wherein R1 and R2 are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group; and R3 is a hydrogen atom or a substituted or unsubstituted aryl group.

2 . The positive electrode active material for a lithium ion secondary battery according to claim 1 , wherein at least a part of a surface of a particle comprising the compound represented by formula (1) is coated with the 1,3-propanedione derivative represented by formula (2).

3 . The positive electrode active material for a lithium ion secondary battery according to claim 1 , wherein at least one of R1 and R2 in formula (2) is a 2-thienyl group, a 2-furanyl group or a fluorophenyl group.

4 . The positive electrode active material for a lithium ion secondary battery according to claim 1 , wherein M 1 comprises Ni, and M 2 comprises Mn in formula (1).

5 . The positive electrode active material for a lithium ion secondary battery according to claim 1 , wherein the compound represented by formula (1) is a compound represented by Li 1.4 Fe 0.2 Ni 0.2 Mn 0.6 O 2.4 .

6 . A lithium ion secondary battery comprising a positive electrode comprising the positive electrode active material for a lithium ion secondary battery according to claim 1 .

7 . The lithium ion secondary battery according to claim 6 , comprising a negative electrode comprising a material capable of intercalating and deintercalating lithium ions, and an electrolytic solution.

8 . The lithium ion secondary battery according to claim 7 , wherein the negative electrode comprises at least one selected from the group consisting of silicon, silicon oxide and carbon.

9 . The lithium ion secondary battery according to claim 7 , wherein the electrolytic solution comprises at least one of a chain carbonate solvent and a cyclic carbonate solvent.

10 . A method for manufacturing a positive electrode active material for a lithium ion secondary battery, the method comprising immersing a particle comprising a compound having a layered rock salt structure and represented by formula (1) below:
Li x Fe s M 1 (z-s) M 2 y O δ   (1)
wherein 1.05≦x≦1.90, 0.05≦s≦0.50, 0.05≦z≦0.50, 0.33≦y≦0.90, 1.20≦δ≦3.10 and z−s≧0; M 1 is at least one element selected from the group consisting of Co and Ni; and M 2 is at least one element selected from the group consisting of Mn, Ti and Zr, in a solution in which a 1,3-propanedione derivative represented by formula (2) below is dissolved, to coat at least a part of a surface of the particle comprising the compound represented by formula (1) with the 1,3-propanedione derivative represented by formula (2):

wherein R1 and R2 are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group; and R3 is a hydrogen atom or a substituted or unsubstituted aryl group.

Assignees

• Nec Corp

Inventors

• Maeda Katsumi
• Hattori Sadanori
• Tamura Noriyuki

Classifications

• H01M10/0525 Primary

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

• H01M4/505

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

• H01M4/525

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

• H01M4/04

  Processes of manufacture in general · CPC title

• H01M10/0566

  Liquid materials · CPC title