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Advanced Lithium Ion Battery Technologies

Lawrence Berkeley National Laboratory

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Technology Marketing SummaryScientists at Berkeley Lab have invented highly conductive polymer binder materials that significantly improve the viability of using silicon as an electrode material in lithium ion batteries. They have also combined lithium metal with the Berkeley Lab conductive binder, plus other materials, to create a hybrid electrode system for use in lithium ion batteries.
Description

Conductive Binder

Berkekely Lab's highly conductive polymer binder materials deliver significantly improved battery life when used in the fabrication of negative silicon electrodes. When combined with high capacity positive electrode materials, the conductive binder materials promise to double energy density. The polymer materials improve the cycling capability of silicon by preventing electrode degradation over time. The polymer binder is highly conductive, thus eliminating the need for conductive additives, and it binds to the silicon particles to maintain good electronic conductivity throughout the electrode. Due to their flexibility, the polymer materials accommodate a battery electrode’s expansion and contraction during charge/discharge. In addition, the Berkeley Lab materials are chemically and mechanically stable. Until now, silicon-based negative electrodes have not maintained stable capacity during the cycling process. The Berkeley Lab conductive binder technologies better tolerate volume changes during cycling and may be compatible with current manufacturing technology.

Silicon Composite Electrode

Combining lithium metal with the Berkeley Lab conductive binder, plus other materials, to create a hybrid electrode system increases the energy density of the lithium ion battery and enables the use of a positive electrode that does not contain lithium ions. The Berkeley Lab technology contributes to improved battery safety by circumventing lithium metal dendrite formation.

 

Benefits
  • Increases energy density by 25% in batteries using silicon negative electrodes
  • Potentially doubles energy density when used with high capacity positive electrode materials
  • Improves cycling capability
  • Improves battery safety
  • Can be incorporated into existing lithium ion battery manufacturing plants
Applications and Industries

Lithium ion rechargeable batteries for

  • hybrid electric vehicles
  • consumer electronics
  • power tools
More Information

For the conductive binder technology, published PCT patent application WO2010135248 is available at www.wipo.int.


Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
IB-2643, IB-2890Prototype - Sample materials have been tested.Available07/26/201107/26/2011

Contact LBL About This Technology

To: Shanshan Li<ipo@lbl.gov>