Nonaqueous electrolyte battery

Patent metadata

Field	Value
Publication number	US-10622635-B2
Application number	US-201715690326-A
Country	US
Kind code	B2
Filing date	Aug 30, 2017
Priority date	Sep 11, 2013
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

According to one embodiment, there is provided a nonaqueous electrolyte battery. The nonaqueous electrolyte battery includes a positive electrode, a negative electrode and a nonaqueous electrolyte. The negative electrode includes a negative electrode material layer. The negative electrode material layer includes a negative electrode active material capable of absorbing and releasing lithium at a potential of 0.78 V (vs. Li/Li + ) or more. A film containing a compound having a propylene glycol backbone is formed on at least a part of a surface of the negative electrode material layer. A content of the compound having the propylene glycol backbone in the film is 2 μmol to 40 μmol per g of a weight of the negative electrode material layer.

First claim

What is claimed is:

1. A nonaqueous electrolyte battery comprising:
a positive electrode;
a negative electrode which comprises a negative electrode current collector and a negative electrode material layer formed on the negative electrode current collector, wherein the negative electrode material layer comprises a negative electrode active material capable of absorbing and releasing lithium at a potential of 0.78 V (vs. Li/Li + ) or more; and
a nonaqueous electrolyte,
wherein
a film comprising a compound having a propylene glycol backbone is formed on at least a part of a surface of the negative electrode material layer;
a content of the compound having the propylene glycol backbone in the film is from 2 μmol to 40 μmol per g of a weight of the negative electrode material layer; and
the compound having the propylene glycol backbone is represented by the following formula (2):

wherein R 1 and R 2 are the same or different, and are selected from the group consisting of an alkyl group, a hydroxyl group, an alkyl lithium group, and an ester compound of phosphoric acid and lithium.

2. The nonaqueous electrolyte battery according to claim 1 , wherein the negative electrode active material comprises a lithium titanate having a spinel structure.

3. The nonaqueous electrolyte battery according to claim 1 , wherein the nonaqueous electrolyte comprises a nonaqueous solvent, the nonaqueous solvent comprises propylene carbonate, and a content of the propylene carbonate in the nonaqueous solvent is from 5% by volume to 50% by volume relative to the volume of the nonaqueous solvent.

4. The nonaqueous electrolyte battery according to claim 1 , wherein the film further comprises a compound having an alkoxyl group.

5. The nonaqueous electrolyte battery according to claim 1 , wherein the nonaqueous electrolyte comprises a nonaqueous solvent and an electrolyte dissolved in the nonaqueous solvent, the electrolyte comprises LiPF 6 , and a content of the LiPF 6 in the electrolyte is 70 mol % or more of the electrolyte.

6. The nonaqueous electrolyte battery according to claim 5 , wherein the electrolyte further comprises at least one selected from the group consisting of lithium perchlorate (LiClO 4 ), lithium tetrafluoroborate (LiBF 4 ), lithium hexafluoroarsenate (LiAsF 6 ), lithium trifluoromethanesulfonate (LiCF 3 SO 3 ), lithium bistrifluoromethylsulfonyl imide [LiN(CF 3 SO 2 ) 2 ], lithium N,N-bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium N,N-bispentafluoroethanesulfonyl amide (LiBETI), lithium bis(fluorosulfonyl)imide (LiFSI), lithium difluorophosphate (LiPF 2 O 2 ), lithium monofluorophosphate (LiPFO 3 H), lithium bisoxalatoborate (LiB(C 2 O 4 ) 2 ), lithium difluoro(oxalato)borate (LiF 2 BC 2 O 4 ), and lithium difluoro(trifluoro-2-oxide-2-trifluoro-methylpropionato(2-)-0,0)borate (LiBF 2 (OCOOC(CF 3 ) 2 ).

7. The nonaqueous electrolyte battery according to claim 5 , wherein the electrolyte further comprises at least one lithium salt comprising boron.

8. The nonaqueous electrolyte battery according to claim 5 , wherein the electrolyte further comprises at least one selected from the group consisting of lithium N,N-bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium N,N-bispentafluoroethanesulfonyl amide (LiBETI), lithium bis(fluorosulfonyl)imide (LiFSI), lithium difluorophosphate (LiPF 2 O 2 ), lithium monofluorophosphate (LiPFO 3 H), lithium bisoxalatoborate (LiB(C 2 O 4 ) 2 ), lithium difluoro(oxalato)borate (LiF 2 BC 2 O 4 ), and lithium difluoro(trifluoro-2-oxide-2-trifluoro-methylpropionato(2-)-0,0)borate (LiBF 2 (OCOOC(CF 3 ) 2 ).

9. A nonaqueous electrolyte battery comprising:
a positive electrode;
a negative electrode which comprises a negative electrode current collector and a negative electrode material layer formed on the negative electrode current collector, wherein the negative electrode material layer comprises a negative electrode active material capable of absorbing and releasing lithium at a potential of 0.78 V (vs. Li/Li + ) or more; and
a nonaqueous electrolyte,
wherein
a film comprising a compound having a propylene glycol backbone is formed on at least a part of a surface of the negative electrode material layer;
a content of the compound having the propylene glycol backbone in the film is from 2 μmol to 40 μmol per g of a weight of the negative electrode material layer; and
the compound having the propylene glycol backbone is represented by the following formula (2):

wherein R 1 and R 2 are different, and are selected from the group consisting of an alkyl group, a carbonyl group, a hydroxyl group, an alkyl lithium group, and an ester compound of phosphoric acid and lithium.

10. The nonaqueous electrolyte battery according to claim 9 , wherein the negative electrode active material comprises a lithium titanate having a spinel structure.

11. The nonaqueous electrolyte battery according to claim 9 , wherein the nonaqueous electrolyte comprises a nonaqueous solvent, the nonaqueous solvent comprises propylene carbonate, and a content of the propylene carbonate in the nonaqueous solvent is from 5% by volume to 50% by volume relative to the volume of the nonaqueous solvent.

12. The nonaqueous electrolyte battery according to claim 9 , wherein the film further comprises a compound having an alkoxyl group.

13. The nonaqueous electrolyte battery according to claim 9 , wherein the nonaqueous electrolyte comprises a nonaqueous solvent and an electrolyte dissolved in the nonaqueous solvent, the electrolyte comprises LiPF 6 , and a content of the LiPF 6 in the electrolyte is 70 mol % or more of the electrolyte.

14. The nonaqueous electrolyte battery according to claim 13 , wherein the electrolyte further comprises at least one selected from the group consisting of lithium perchlorate (LiClO 4 ), lithium tetrafluoroborate (LiBF 4 ), lithium hexafluoroarsenate (LiAsF 6 ), lithium trifluoromethanesulfonate (LiCF 3 SO 3 ), lithium bistrifluoromethylsulfonyl imide [LiN(CF 3 SO 2 ) 2 ], lithium N,N-bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium N,N-bispentafluoroethanesulfonyl amide (LiBETI), lithium bis(fluorosulfonyl)imide (LiFSI), lithium difluorophosphate (LiPF 2 O 2 ), lithium monofluorophosphate (LiPFO 3 H), lithium bisoxalatoborate (LiB(C 2 O 4 ) 2 ), lithium difluoro(oxalato)borate (LiF 2 BC 2 O 4 ), and lithium difluoro(trifluoro-2-oxide-2-trifluoro-methylpropionato(2-)-0,0)borate (LiBF 2 (OCOOC(CF 3 ) 2 ).

15. The nonaqueous electrolyte battery according to claim 13 , wherein the electrolyte further comprises at least one lithium salt comprising boron.

16. The nonaqueous electrolyte battery according to claim 13 , wherein the electrolyte further comprises at least one selected from the group consisting of lithium N,N-bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium N,N-bispentafluoroethanesulfonyl amide (LiBETI), lithium bis(fluorosulfonyl)imide (LiFSI), lithium difluorophosphate (LiPF 2 O 2 ), lithium monofluorophosphate (LiPFO 3 H), lithium bisoxalatoborate (LiB(C 2 O 4 ) 2 ), lithium difluoro(oxalato)borate (LiF 2 BC 2 O 4 ), and lithium difluoro(trifluoro-2-oxide-2-trifluoro-methylpropionato(2-)-0,0)borate (LiBF 2 (OCOOC(CF 3 ) 2 ).

Assignees

• Toshiba Kk

Inventors

• Yamamoto Dai
• Watanabe Yuki
• Saruwatari Hidesato
• Kuriyama Kazuya
• Satake Hideki

Classifications

• H01M10/446

  Initial charging measures · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• Y10T29/49108

  Electric battery cell making · CPC title

• H01M4/366

  as layered products · CPC title

• H01M2300/0028

  characterised by the solvent · CPC title