Symmetric hybrid supercapacitor and use of LiMnxFe1-xPO4 as electrode material for a hybrid supercapacitor

Patent metadata

Field	Value
Publication number	US-10020122-B2
Application number	US-201615273802-A
Country	US
Kind code	B2
Filing date	Sep 23, 2016
Priority date	Sep 25, 2015
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

A symmetric hybrid supercapacitor has two internally hybridized electrodes having both faradic and capacitatively active materials. More specifically, the symmetric hybrid supercapacitor has a cathode and an anode. The cathode contains LiMn x Fe 1-x PO 4 . The LiMn x Fe 1-x PO 4 is used as electrode material for the hybrid supercapacitor. The condition applies that 0.1<x<0.9.

First claim

What is claimed is:

1. A symmetric hybrid supercapacitor, comprising:
a cathode comprising LiMn x Fe 1-x PO 4 ,
wherein 0.1<x<0.9,
wherein the LiMn x Fe 1-x PO 4 forms a composite material with carbon, and
wherein the composite material contains 30%-40% by weight of LiMn x Fe 1-x PO 4 and 60%-70% by weight of carbon.

2. The symmetric hybrid supercapacitor according to claim 1 , wherein 0.3≤x<0.9.

3. The symmetric hybrid supercapacitor according to claim 1 , wherein the LiMn x Fe 1-x PO 4 is in the form of carbon-coated particles.

4. The symmetric hybrid supercapacitor according to claim 1 , wherein the cathode further comprises 2.5 wt % to 7.5 wt % polytetrafluoroethylene (PTFE) by weight of LiMn x Fe 1-x PO 4 .

5. The symmetric hybrid supercapacitor according to claim 1 , wherein:
the cathode contains 2%-10% by weight further graphite and/or carbon black nanoparticles based on 100% by weight of the composite material.

6. The symmetric hybrid supercapacitor according to claim 1 , wherein
the cathode contains 2.5%-7.5% by weight of at least one binder based on 100% by weight of the composite material.

7. A symmetric hybrid supercapacitor, comprising:
a cathode comprising LiMn x Fe 1-x PO 4 , and
an anode containing Li 4 Ti 5 O 12 ,
wherein 0.1<x<0.9.

8. The symmetric hybrid supercapacitor according to claim 7 , wherein
the Li 4 Ti 5 O 12 forms a composite material with carbon, and
the composite material contains 20%-30% by weight of Li 4 Ti 5 O 12 and 70%-80% by weight of carbon.

9. The symmetric hybrid supercapacitor according to claim 1 , wherein the carbon is in a polymorph selected from the group consisting of carbon nanotubes, carbon nanofibers, graphene, functionalized graphene, activated carbon, and mixtures thereof.

10. A method of of manufacturing a symmetric hybrid supercapacitor, which comprises:
providing LiMn x Fe 1-x PO 4 , and
incorporating the LiMn x Fe 1-x PO 4 into an electrode,
wherein 0.1<x<0.9,
wherein the LiMn x Fe 1-x PO 4 forms a composite material with carbon, and
wherein the composite material contains 30%-40% by weight of LiMn x Fe 1-x PO 4 and 60%-70% by weight of carbon.

11. The method according to claim 10 , wherein the electrode is a cathode that further comprises 2.5 wt % to 7.5 wt % polytetrafluoroethylene (PTFE) by weight of LiMn x Fe 1-x PO 4 .

Assignees

• Bosch Gmbh Robert

Inventors

• Hahn Severin
• Buehler Elisabeth
• Verma Pallavi

Classifications

• H01G11/06 Primary

  with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] · CPC title

• H01G11/34 Primary

  characterised by carbonisation or activation of carbon · CPC title

• H01G11/40

  Fibres · CPC title

• H01G11/36

  Nanostructures, e.g. nanofibres, nanotubes or fullerenes · CPC title

• H01G11/04

  Hybrid capacitors · CPC title