Electrode and method for manufacturing an electrode

Patent metadata

Field	Value
Publication number	US-9595716-B2
Application number	US-201314020310-A
Country	US
Kind code	B2
Filing date	Sep 6, 2013
Priority date	Sep 7, 2012
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

An electrode for an energy store, in particular for a lithium-ion battery. To achieve a particularly good and long-term stable capacitance, the electrode includes an active material, optionally a binder, optionally a conductive additive, and a sorption agent; intermediate stages of the active material arising during a charging and/or discharging procedure of the energy store may be immobilized by the sorption agent. Furthermore, also described is a method for manufacturing an electrode for an energy store, and the use of a sorption agent for manufacturing an electrode for an electrochemical energy store.

First claim

What is claimed is:

1. An electrode for an energy store, comprising:
an active material provided with a binder and a conductive additive; and
a sorption agent distinct from the active material, the binder and the conductive additive, wherein intermediate stages of the active material arising during at least one of a charging procedure and a discharging procedure of the energy store are immobilized by the sorption agent, and wherein the sorption agent has a multi-ply construction including a core, a carbon layer surrounding the core, and a sorption ply surrounding the carbon layer.

2. The electrode as recited in claim 1 , wherein the sorption agent selectively immobilizes polysulfides.

3. The electrode as recited in claim 1 , wherein the sorption agent includes a polymer.

4. The electrode as recited in claim 3 , wherein the polymer is selected from the group composed of polyethers, for example, polyethylene glycols, polyacrylates, polystyrenes, polyvinyl styrenes, polyvinyl alcohols, polysiloxanes, polyesters, or of derivatives or mixtures of the above-mentioned materials.

5. The electrode as recited in claim 1 , wherein the sorption agent includes a core that has a material which is selected from the group composed of silicon dioxide, aluminum dioxide, titanium dioxide, zirconium dioxide, silica gel, magnesium oxide, zinc oxide, or electrically conductive carbon compounds, for example, active carbon or carbon nanotubes, or a mixture of the above-mentioned materials.

6. The electrode as recited in claim 5 , wherein the core is porous.

7. The electrode as recited in claim 6 , wherein the core has a pore volume in a range from greater than or equal to 0.025 cm 3 /g to less than or equal to 3.0 cm 3 /g.

8. The electrode as recited in claim 1 , wherein the energy store includes a lithium-based energy store.

9. An energy store, comprising:
at least one electrode, comprising:
an active material provided with a binder and a conductive additive; and
a sorption agent distinct from the active material, the binder and the conductive additive, wherein intermediate stages of the active material arising during at least one of a charging procedure and a discharging procedure of the energy store are immobilized by the sorption agent, and wherein the sorption agent has a multi-ply construction including a core, a carbon layer surrounding the core, and a sorption ply surrounding the carbon layer.

10. The energy store as recited in claim 9 , wherein the energy store includes a lithium-sulfur energy store.

Assignees

• Bosch Gmbh Robert

Inventors

• Wegner Marcus
• Grimminger Jens
• Tenzer Martin
• Fanous Jean

Classifications

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/62 Primary

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title