Lithium borate compound, additive for lithium secondary battery, non-aqueous electrolyte solution for lithium secondary battery, lithium secondary battery precursor, and lithium secondary battery and method of producing the same

Patent metadata

Field	Value
Publication number	US-2021253602-A1
Application number	US-201917262297-A
Country	US
Kind code	A1
Filing date	Jul 17, 2019
Priority date	Jul 26, 2018
Publication date	Aug 19, 2021
Grant date	—

Abstract

The present disclosure provides a lithium borate compound represented by the following Formula (I), an additive for a lithium secondary battery, which contains the lithium borate compound, a non-aqueous electrolyte solution for a lithium secondary battery, a lithium secondary battery precursor, and a lithium secondary battery and method of producing the same. In Formula (I), R represents a single bond or an alkylene group having from 1 to 4 carbon atoms.

First claim

1 . A lithium borate compound represented by the following Formula (I):

wherein, in Formula (I), R represents a single bond or an alkylene group having from 1 to 4 carbon atoms.

2 . The lithium borate compound according to claim 1 , wherein R is a single bond, a methylene group, or an ethylene group.

3 . The lithium borate compound according to claim 1 , which is a compound represented by the following Formula (II):

4 . An additive for a lithium secondary battery, the additive comprising the lithium borate compound according to claim 1 .

5 . A non-aqueous electrolyte solution for a lithium secondary battery, the non-aqueous electrolyte solution comprising:
an electrolyte that is a lithium salt containing fluorine; a non-aqueous solvent; and the lithium borate compound according to claim 1 .

6 . The non-aqueous electrolyte solution for a lithium secondary battery according to claim 5 , wherein a content of the lithium borate compound is from 0.10% by mass to 5.0% by mass with respect to a total amount of the non-aqueous electrolyte solution for a lithium secondary battery.

7 . The non-aqueous electrolyte solution for a lithium secondary battery according to claim 5 , further comprising vinylene carbonate.

8 . The non-aqueous electrolyte solution for a lithium secondary battery according to claim 7 , wherein a value obtained by dividing a content mass of the lithium borate compound by a content mass of the vinylene carbonate is 0.125 or more.

9 . The non-aqueous electrolyte solution for a lithium secondary battery according to claim 7 , wherein a value obtained by dividing a content mass of the lithium borate compound by a content mass of the vinylene carbonate is 0.500 or less.

10 . A lithium secondary battery precursor comprising:
a casing; and a positive electrode, a negative electrode, a separator, and an electrolyte solution housed in the casing, wherein: the positive electrode is a positive electrode capable of storing and releasing lithium ions, the negative electrode is a negative electrode capable of storing and releasing lithium ions, and the electrolyte solution is the non-aqueous electrolyte solution for a lithium secondary battery according to claim 5 .

11 . The lithium secondary battery precursor according to claim 10 , wherein the positive electrode comprises a lithium-containing composite oxide represented by the following Formula (C1) as a positive electrode active material:
LiNi a Co b Mn c O 2   Formula (C1)
wherein, in Formula (C1), each of a, b, and c is independently from more than 0 to less than 1, and a sum of a, b, and c is from 0.99 to 1.00.

12 . A method of producing a lithium secondary battery, the method comprising:
preparing the lithium secondary battery precursor according to claim 10 ; and obtaining a lithium secondary battery by subjecting the lithium secondary battery precursor to an aging treatment, wherein the aging treatment includes subjecting the lithium secondary battery precursor to charging and discharging in an environment of from 30° C. to 50° C.

13 . A lithium secondary battery, comprising:
a casing, and a positive electrode, a negative electrode, a separator, and an electrolyte solution housed in the casing, wherein: the positive electrode is a positive electrode capable of absorbing and releasing lithium ions, the negative electrode is a negative electrode capable of absorbing and releasing lithium ions, the electrolyte solution is a non-aqueous electrolyte solution containing an electrolyte that is a lithium salt containing fluorine and a non-aqueous solvent, a negative electrode film containing an organic component and an inorganic component, derived from a lithium borate compound represented by the following Formula (I) and the electrolyte, is formed on at least a portion of a surface of the negative electrode, and a positive electrode film containing an inorganic component, derived from a lithium borate compound represented by the following Formula (I) and the electrolyte, is formed on at least a portion of a surface of the positive electrode:

wherein, in Formula (I), R represents a single bond or an alkylene group having from 1 to 4 carbon atoms.

14 . The lithium secondary battery according to claim 13 , wherein:
the organic component in the negative electrode film contains a compound represented by the following Formula (III), and each of the inorganic component in the negative electrode film and the inorganic component in the positive electrode film contains a compound represented by the following Formula (IV):

Assignees

• Mitsui Chemicals Inc

Inventors

• Zhang Han
• Shimizu Yusuke
• Fujiyama Satoko
• Goto Kenichi
• Mio Shigeru

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0567

  characterised by the additives · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title

• C07F5/04 Primary

  Esters of boric acids · 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