Electrolytes for lithium transition metal phosphate batteries

Patent metadata

Field	Value
Publication number	US-2017207486-A1
Application number	US-201415324059-A
Country	US
Kind code	A1
Filing date	Jul 23, 2014
Priority date	Jul 23, 2014
Publication date	Jul 20, 2017
Grant date	—

Abstract

Electrolytic solutions and secondary batteries containing same are provided. The electrolytic solutions contain an additive consisting of one or more C 5 -C 7 monocycloalkane compounds and derivatives thereof.

First claim

What is claimed is:

1 . A non-aqueous electrolyte composition comprising (a) one or more ionic salts; (b) one or more non-aqueous solvents; and (c) an additive consisting of one or more C 5 -C 7 monocycloalkane compounds and derivatives thereof.

2 . A non-aqueous electrolyte composition according to claim 1 wherein the C 5 -C 7 monocycloalkanes and derivatives thereof are represented by the following chemical formulae:

wherein R 1 and R 2 are each independently H, C 1 -C 10 alkyl, and halogen groups.

3 . A non-aqueous electrolyte composition according to claim 2 , wherein the R 1 -R 2 alkyl substituents are independently C 1 -C 8 alkyl.

4 . A non-aqueous electrolyte composition according to claim 2 , wherein the additive (c) is formula 2:

wherein R 1 and R 2 are each independently H, C 1 -C 10 alkyl, and halogen groups.

5 . A non-aqueous electrolyte composition according to claim 1 , wherein R 1 is C 1 -C 4 alkyl and R 2 is hydrogen.

6 . A non-aqueous electrolyte composition according to claim 1 , wherein the one or more ionic salts are selected from the group consisting of lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ) and combinations thereof.

7 . A non-aqueous electrolyte composition according to claim 1 , wherein, the non-aqueous solvent is selected from the group consisting of ethylene carbonate (EC), propylene carbonate (PC), methyl ethyl carbonate (EMC), dimethyl carbonate (DMC), diethyl carbonate (DEC), γ-butyrolactone (GBL), methyl propyl carbonate (MPC), methyl formate (MF), ethyl formate (EF), methyl acetate (MA), ethyl acetate (EA), ethyl propionate (EP), ethyl butyrate (EB), acetonitrile (AN), N,N-dimethyllformamide (DMF) and combinations thereof.

8 . A non-aqueous electrolyte composition according to claim 1 , wherein the non-aqueous organic solvent is a mixture of two or three solvents selected from the group consisting of ethylene carbonate (EC), propylene carbonate (PC), methyl ethyl carbonate (EMC), dimethyl carbonate (DMC), and diethyl carbonate (DEC).

9 . A secondary battery comprising:
a. an anode, b. a cathode comprised of at least one lithium transition metal phosphate, and, c. a non-aqueous electrolyte composition comprising (a) one or more ionic salts; (b) one or more non-aqueous solvents; and (c) an additive consisting of one or more C 5 -C 7 monocycloalkane compounds and derivatives thereof.

10 . The secondary battery of claim 9 , wherein the at least one lithium transition metal phosphate (LiMPO 4 ) is selected from the group consisting of LiFePO 4 , LiVPO 4 , LiMnPO 4 , LiCoPO 4 , LiNiPO 4 , and LiMn x Mc y PO 4 , where Mc is one of or more of Fe, V, Ni, Co, Al, Mg, Ti, B, Ga, and Si and 0<x,y<1.

11 . The secondary battery of claim 10 , wherein the at least one lithium transition metal phosphate (LiMPO 4 ) is selected from the group consisting of LiFePO 4 , LiMnPO 4 and combinations thereof.

12 . The secondary battery of according to claim 9 , wherein the solvent is a mixture of one or more solvents selected from the group consisting of ethylene carbonate (EC), propylene carbonate (PC), methyl ethyl carbonate (EMC), dimethyl carbonate (DMC), and diethyl carbonate (DEC).

13 . The secondary battery of according to claim 9 , wherein the additive (c) is formula 2:

wherein R 1 and R 2 are each independently H, C 1 -C 10 alkyl, and halogen groups.

14 . The secondary battery of claim 13 , wherein R 1 is C 1 -C 4 alkyl and R 2 is hydrogen.

15 . The secondary battery according to claim 9 , wherein the one or more ionic salts comprises a salt selected from the group consisting of LiPF 6 ; LiBf 4 , and combinations thereof.

Assignees

• Basf Corp

Inventors

• Wu Meimei
• Hu Xueshan

Classifications

• H01M4/5825

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

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0525

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

• H01M10/0568

  characterised by the solutes · CPC title