Non-aqueous, high capacity cathode material for lithium secondary battery, and method for preparing same

Patent metadata

Field	Value
Publication number	US-2016372739-A1
Application number	US-201415105474-A
Country	US
Kind code	A1
Filing date	Oct 29, 2014
Priority date	Dec 17, 2013
Publication date	Dec 22, 2016
Grant date	—

Abstract

The present invention relates to a non-aqueous cathode material for lithium secondary batteries using a spherical transition metal complex carbonate, and a method for preparing same. According to the present invention, since the surface of a spherical transition metal complex carbonate, which is prepared by using a cobalt material, nickel material, manganese material, carboxyl group material, and ammonia material, is coated with titanium dioxide. In addition, by mixing the prepared, surface-coated transition metal complex carbonate with a lithium material and heat-treating the resultant material, it is possible to prepare a spherical Li-rich cathode material having a primary particle size of 200 nm or more, and a 0.1C capacity of 250 mAh/g or more, and capable of implementing 96% or more of the initial capacity in a full cell after charging and discharging 60 times.

First claim

1 . A method of preparing a non-aqueous cathode material for a lithium secondary battery, the method comprising:
a process of preparing a spherical transition metal complex carbonate by co-precipitating an aqueous solution in which a nickel material, a cobalt material, a manganese material, a carboxyl group material, and an ammonia material are mixed; a process of coating a surface of the spherical transition metal complex carbonate with nano-sized titanium dioxide; and a process of preparing a lithium-rich cathode material by mixing a lithium material with the transition metal complex carbonate coated with nano-sized titanium dioxide and performing a heat treatment thereon to prepare a spherical lithium-rich cathode material substituted with other metals.

2 . The method of claim 1 , where in the process of coating, the spherical transition metal complex carbonate coated with nano-sized titanium dioxide has a composition ratio of Ni x Co y Mn 1−x−y Ti z CO 3 (0.0<x≦0.3, 0.0<y≦0.2, 0.01≦z≦0.1, 0.5≦1−x−y) and an average particle size of 5 to 25 μm.

3 . The method of claim 1 , where in the process of preparing a spherical transition metal complex carbonate, a concentration of each of the cobalt material, nickel material, manganese material, carboxyl group material, and ammonia material is in a range of 0.5 to 2 M,
wherein the cobalt material, nickel material, manganese material, carboxyl group material, and ammonia material are co-precipitated in a ratio of (cobalt material+nickel material+manganese material):carboxyl group material:ammonia material=1:1.8 to 2.5:0.5 to 1.5 or less, and a pH of a mixed aqueous solution is maintained in a range of 7 to 9.

4 . The method of claim 1 , wherein the process of coating comprises:
a process of mixing the transition metal complex carbonate with a suspension containing nano-sized titanium dioxide; and a process of coating a surface of the transition metal complex carbonate with the nano-sized titanium dioxide by drying the suspension that was mixed with the transition metal complex carbonate.

5 . The method of claim 1 , wherein the process of preparing a lithium-rich cathode material comprises:
mixing lithium carbonate with the transition metal complex carbonate coated with titanium dioxide; and performing a heat treatment on a mixture thereof.

6 . The method of claim 5 , where in the process of preparing a lithium-rich cathode material, the heat treatment is performed at a temperature in a range of 900 to 1100° C.

7 . The method of claim 1 , further comprising, after the process of preparing a lithium-rich cathode material:
a process of pulverizing the lithium-rich cathode material into a powder.

8 . The method of claim 1 , where in the process of preparing a lithium-rich cathode material, the lithium-rich cathode material has a composition ratio of Li w Ni x Co y Mn 1−x−y Ti z O 2 (0.0<x≦0.3, 0.0<y<0.2, 0.5≦1−x−y−z, 0.01≦z≦0.1, 1.2≦w≦1.7), is spherical, and has an average particle size of 5 to 25 μm.

9 . A non-aqueous cathode material for a lithium secondary battery, the non-aqueous cathode material having a composition ratio of Li w Ni x Co y Mn 1−x−y Ti z O 2 (0.0<x≦0.3, 0.0<y<0.2, 0.5≦1−x−y−z, 0.01≦z≦0.1, 1.2≦w≦1.7), a spherical shape, and an average particle size of 5 to 25 μm.

Assignees

• Korea Electronics Technology

Inventors

• Song Junho
• Kim Youngjun
• Kim Jeomsoo
• Cho Woosuk
• Woo Sanggil
• Yim Taeeun
• Lee Kyungjun
• Park Yeonggwang

Classifications

• C01P2006/40

  Electric properties · CPC title

• C01P2004/80

  Particles consisting of a mixture of two or more inorganic phases · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• H01M4/131

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

• C01P2004/62

  Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title