Lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-2017222270-A1
Application number	US-201715493049-A
Country	US
Kind code	A1
Filing date	Apr 20, 2017
Priority date	Nov 10, 2011
Publication date	Aug 3, 2017
Grant date	—

Abstract

It is an object of this exemplary embodiment to provide a lithium ion secondary battery using a positive electrode active material having an operating potential of 4.5 V or more, the lithium ion secondary battery having excellent high temperature cycle characteristics. This exemplary embodiment is a lithium ion secondary battery comprising a positive electrode and a negative electrode capable of intercalating and deintercalating lithium, a separator between the positive electrode and the negative electrode, and an electrolytic solution containing a nonaqueous electrolytic solvent, wherein the positive electrode comprises a positive electrode active material operating at a potential of 4.5 V or more versus lithium, the separator comprises cellulose, a cellulose derivative, or a glass fiber, and the nonaqueous electrolytic solvent comprises a fluorinated solvent.

First claim

1 - 14 . (canceled)

15 . A lithium ion secondary battery comprising a positive electrode and a negative electrode which are capable of intercalating and deintercalating lithium, a separator between the positive electrode and the negative electrode, and an electrolytic solution containing a nonaqueous electrolytic solvent, wherein
the positive electrode comprises a positive electrode active material operating at a potential of 4.5 V or more versus lithium, the separator comprises cellulose, a cellulose derivative, or a glass fiber, the nonaqueous electrolytic solvent comprises a fluorinated solvent, and the positive electrode active material comprises a lithium manganese complex oxide represented by the following formula (C),
Li x [Li a M b Mn 1-a-b ]O 2   (C).

wherein 0≦x≦1, 0.05≦a≦0.3, and 0.1<b<0.4, and M is at least one selected from Ni, Co, Fe, and Cr.

16 . The lithium ion secondary battery according to claim 15 , wherein the fluorinated solvent is a fluorinated ether represented by the following formula (1-1);
R 101 —O—R 101   (1-1)
wherein R 101 and R 102 each independently represent an alkyl group or a fluorine-substituted alkyl group, and at least one of R 101 and R 102 is a fluorine-substituted alkyl group.

17 . The lithium ion secondary battery according to claim 15 , wherein the fluorinated solvent is a fluorinated phosphate represented by the following formula (2-1);

wherein R 201 , R 202 , and R 203 each independently represent an alkyl group or a fluorine-substituted alkyl group, and at least one of R 201 , R 202 , and R 203 is a fluorine-substituted alkyl group.

18 . The lithium ion secondary battery according to claim 15 , wherein the fluorinated solvent is a fluorinated carboxylate represented by the following formula (3-1);

wherein R 301 and R 302 each independently represent an alkyl group or a fluorine-substituted alkyl group, and at least one of R 301 and R 302 is a fluorine-substituted alkyl group.

19 . The lithium ion secondary battery according to claim 15 , wherein the fluorinated solvent is a fluorinated carbonate represented by the following formula (4-1);

wherein R 401 and R 402 each independently represent an alkyl group or a fluorine-substituted alkyl group, and at least one of R 401 and R 402 is a fluorine-substituted alkyl group.

20 . The lithium ion secondary battery according to claim 15 , wherein the separator is a cellulose-containing separator.

21 . The lithium ion secondary battery according to claim 15 , wherein the separator is a cellulose derivative-containing separator.

22 . The lithium ion secondary battery according to claim 15 , wherein the separator is a glass fiber-containing separator.

23 . The lithium ion secondary battery according to claim 15 , wherein a porosity of the separator is 50% or more and 95% or less.

24 . The lithium ion secondary battery according to claim 15 , wherein a content of the fluorinated solvent in the nonaqueous electrolytic solvent is 30 to 90% by volume.

25 . The lithium ion secondary battery according to claim 15 , wherein the nonaqueous electrolytic solvent further comprises a carbonate compound.

26 . The lithium ion secondary battery according to claim 15 , wherein the nonaqueous electrolytic solvent further comprises a sulfone compound represented by the following formula (A);

wherein R 1 and R 2 each independently represent a substituted or unsubstituted alkyl group; and a carbon atom of R 1 and a carbon atom of R 2 may be bonded via a single bond or a double bond to form a cyclic structure.

27 . The lithium ion secondary battery according to claim 15 , wherein the nonaqueous electrolytic solvent further comprises a carbonate compound,
a content of the fluorinated solvent in the nonaqueous electrolytic solvent is 10 to 50% by volume, and a content of the carbonate compound in the nonaqueous electrolytic solvent is 50 to 90% by volume.

28 . The lithium ion secondary battery according to claim 16 , wherein the nonaqueous electrolytic solvent further comprises a sulfone compound represented by the following formula (A),
a content of the fluorinated ether in the nonaqueous electrolytic solvent is 10 to 80% by volume, and a content of the sulfone compound in the nonaqueous electrolytic solvent is 5 to 75% by volume.

wherein R 1 and R 2 each independently represent a substituted or unsubstituted alkyl group; and a carbon atom of R 1 and a carbon atom of R 2 may be bonded via a single bond or a double bond to form a cyclic structure.

29 . The lithium ion secondary battery according to claim 28 , wherein the content of the fluorinated ether in the nonaqueous electrolytic solvent is 20 to 70% by volume, and the content of the sulfone compound in the nonaqueous electrolytic solvent is 10 to 50% by volume.

30 . The lithium ion secondary battery according to claim 28 , wherein the nonaqueous electrolytic solvent further comprises a carbonate compound,
a content of the carbonate compound in the nonaqueous electrolytic solvent is 10 to 80% by volume.

31 . The lithium ion secondary battery according to claim 29 , wherein the nonaqueous electrolytic solvent further comprises a carbonate compound,
a content of the carbonate compound in the nonaqueous electrolytic solvent is 10 to 70% by volume.

32 . The lithium ion secondary battery according to claim 17 , wherein the nonaqueous electrolytic solvent further comprises a sulfone compound represented by the following formula (A),
a content of the fluorinated phosphate in the nonaqueous electrolytic solvent is 5 to 80% by volume, and a content of the sulfone compound in the nonaqueous electrolytic solvent is 5 to 75% by volume.

wherein R 1 and R 2 each independently represent a substituted or unsubstituted alkyl group; and a carbon atom of R 1 and a carbon atom of R 2 may be bonded via a single bond or a double bond to form a cyclic structure.

33 . The lithium ion secondary battery according to claim 18 , wherein the nonaqueous electrolytic solvent further comprises a sulfone compound represented by the following formula (A),
a content of the fluorinated carboxylate in the nonaqueous electrolytic solvent is 1 to 60% by volume, and a content of the sulfone compound in the nonaqueous electrolytic solvent is 5 to 75% by volume.

wherein R 1 and R 2 each independently represent a substituted or unsubstituted alkyl group; and a carbon atom of R 1 and a carbon atom of R 2 may be bonded via a single bond or a double bond to form a cyclic structure.

34 . The lithium ion secondary battery according to claim 19 , wherein the nonaqueous electrolytic solvent further comprises a sulfone compound represented by the following formula (A),
a c

Assignees

• Nec Corp

Inventors

• Uehara Makiko
• Noguchi Takehiro

Classifications

• 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

• H01M10/0525

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

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M4/505 Primary

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

• H01M2300/0037

  Mixture of solvents · CPC title