Mesoporous nanocrystalline film architecture for capacitive storage devices

Patent metadata

Field	Value
Publication number	US-10741337-B2
Application number	US-201815919295-A
Country	US
Kind code	B2
Filing date	Mar 13, 2018
Priority date	Jan 9, 2009
Publication date	Aug 11, 2020
Grant date	Aug 11, 2020

Abstract

A mesoporous, nanocrystalline, metal oxide construct particularly suited for capacitive energy storage that has an architecture with short diffusion path lengths and large surface areas and a method for production are provided. Energy density is substantially increased without compromising the capacitive charge storage kinetics and electrode demonstrates long term cycling stability. Charge storage devices with electrodes using the construct can use three different charge storage mechanisms immersed in an electrolyte: (1) cations can be stored in a thin double layer at the electrode/electrolyte interface (non-faradaic mechanism); (2) cations can interact with the bulk of an electroactive material which then undergoes a redox reaction or phase change, as in conventional batteries (faradaic mechanism); or (3) cations can electrochemically adsorb onto the surface of a material through charge transfer processes (faradaic mechanism).

First claim

What is claimed is:

1. A nanostructured, mesoporous electrode, comprising:
an electrically conductive substrate;
at least one mesoporous, nanocrystalline material with a plurality of pores, said pores having nanocrystalline walls, said pores being flexible whereby strain associated with charging and discharging is alleviated; and
a nanoscale conducting material in contact with said mesoporous nanocrystalline material and said electrically conductive substrate;
wherein said at least one mesoporous, nanocrystalline material comprises an assembly of NbO x nanocrystals between layers of graphene or reduced chemically-derived graphene oxide (rGO).

2. The nanostructured, mesoporous electrode of claim 1 , wherein said nanoscale conducting material comprises a material selected from the group consisting of carbon blacks, carbon nanotubes, and carbon nanofibers.

3. The nanostructured, mesoporous electrode of claim 1 , wherein said nanoscale conducting material comprises a conducting or semiconducting polymer applied as a surface coating to the mesoporous nanocrystalline material; and wherein said surface coating forms the same mesoporosity as said mesoporous, nanocrystalline material.

Assignees

• Univ California

Inventors

• Dunn Bruce S
• Tolbert Sarah H
• Wang John
• Brezesinski Torsten
• Gruner George

Classifications

• H01G11/26

  characterised by their structure, e.g. multi-layered, porosity or surface features · CPC title

• H01G11/24

  characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor · CPC title

• H01G11/46

  Metal oxides · CPC title

• H01G11/86

  specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) · CPC title

• Y10S977/948

  Energy storage/generating using nanostructure, e.g. fuel cell, battery · CPC title