Positive-electrode material for lithium ion secondary battery, method for producing the same, and lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-2020373572-A1
Application number	US-202016994036-A
Country	US
Kind code	A1
Filing date	Aug 14, 2020
Priority date	Nov 13, 2015
Publication date	Nov 26, 2020
Grant date	—

Abstract

A positive-electrode material for a lithium ion secondary battery contains a lithium complex compound that is represented by the formula: Li1+aNibMncCodTieMfO2+α, and has an atomic ratio Ti3+/Ti4+ between Ti3+ and Ti4+, as determined through X-ray photoelectron spectroscopy, of greater than or equal to 1.5 and less than or equal to 20. In the formula, M is at least one element selected from the group consisting of Mg, Al, Zr, Mo, and Nb, and a, b, c, d, e, f, and a are numbers satisfying −0.1≤a≤0.2, 0.7<b≤0.9, 0≤c<0.3, 0≤d<0.3, 0<e≤0.25, 0≤f<0.3, b+c+d+e+f=1, and −0.2≤α≤0.2.

First claim

1 . A positive-electrode material for a lithium ion secondary battery, the positive-electrode material containing a lithium complex compound represented by the following Formula (1) and having an atomic ratio Ti 3+ /Ti 4+ between Ti 3+ and Ti 4+ , as determined through X-ray photoelectron spectroscopy, of greater than or equal to 1.5 and less than or equal to 20:
Li 1+a Ni b Mn c Co d Ti e M f O 2+α   (1),
where in the Formula (1), M is at least one element selected from the group consisting of Mg, Al, Zr, Mo, and Nb, and a, b, c, d, e, f, and α are numbers satisfying −0.1≤a≤0.2, 0.7<b≤0.9, 0≤c<0.3, 0≤d<0.3, 0<e≤0.25, 0≤f<0.3, b+c+d+e+f=1, and −0.2≤α≤0.2, applying surface treatment to the positive-electrode material for the lithium ion secondary battery by immersing the positive-electrode material in an organic solvent containing dissolved therein a boroxine compound represented by the following Formula (2) and fluoride:
(BO) 3 (OR) 3   (2),

where R in the Formula (2) is an organic group having one or more carbon atoms.

2 . The method for producing the positive-electrode material for the lithium ion secondary battery according to claim 1 , wherein the boroxine compound is triisopropoxyboroxin ((BO) 3 (O(CH)(CH 3 ) 2 ) 3 ).

3 . The method for producing the positive-electrode material for the lithium ion secondary battery according to claim 1 , wherein the fluoride is lithium hexafluorophosphate(LiPF 6 ).

Assignees

• Hitachi Metals Ltd

Inventors

• Gunji Akira
• Tokoro Hisato
• Takahashi Shin
• Toyama Tatsuya
• Haruna Hiroshi
• TAKAMATSU Daiko
• Nakabayashi Takashi
• Takano Shuichi

Classifications

• C01P2006/12

  Surface area · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01P2004/50

  Agglomerated particles · CPC title

• C01P2002/72

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

• C01P2002/52

  containing elements as dopants · CPC title