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High Power Performance Lithium Ion Battery

IB-2220

APPLICATIONS OF TECHNOLOGY:

     
   
    Hybrid Pulse Power Characterization Test (HPPC) results for 3 coin cells of various AB:PVDF ratios. Cell 1, which has the highest binder (PVDF) to acetylene black ratio, displays the most favorable discharge ASI.  
       
  • Lithium ion batteries with high power requirements e.g. electric and (plug-in) hybrid/electric vehicles, power tools

ADVANTAGES:

  • 20-30% increase in power performance
  • Enhances electrode mechanical integrity
  • Promises longer lifetime
  • Lowers internal resistances

ABSTRACT:

Gao Liu and colleagues at Berkeley Lab have increased the power performance of lithium ion batteries by over 20 percent by optimizing the ratio of polymer binder to conductive additive (acetylene black) in the cathode.  The new electrode compositions also significantly improve mechanical resilience and promise longer cycling lifetimes.

It has long been accepted that since acetylene black is a conductive additive, increasing it’s ratio with respect to nonconductive binder would improve electrode performance in lithium ion batteries.  The Berkeley Lab researchers have demonstrated the opposite. They increase the ratio of binder to acetylene black in the electrode composition. This small change improves the power performance of the lithium-ion battery by over 20 percent.  The new compositions possess similar ohmic resistively compared to existing cathodes but significantly improved lithium kinetic performance, resulting in low internal resistance and higher capacity utilization at high discharge rates – properties crucial for enhanced vehicle and power tool performance.

STATUS:

  • Published Patent Application WO/2008/138003 available at www.wipo.int. Available for licensing or collaborative research.

FOR MORE INFORMATION:

Liu, G., Battaglia, V., “Optimization of Acetylene Black Conductive Additive and Polyvinylidene Fluoride Composition for high Power Rechargeable Lithium-Ion Cells,” The 211th Electrochemical Society Meeting, Chicago IL, May 6-10, 2007.

 

REFERENCE NUMBER: IB-2220


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