Lattice Energy LLC  Growth of conductive metallic “tin whiskers” and random electrical shortingevents implicated in Toyota...
Lattice Energy LLC          Example of lithium metal dendrites growing in Li-ion battery electrolyte               Source:...
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Lattice Energy LLC- Tin Whisker Shorting Problems Analogous to Li-ion Batteries-Jan 24 2012

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  • Dear Readers:

    What you see here is version #2. I corrected a glaring typo re frequency data in v. #1 and also cleaned-up the explanatory text on top (haste makes waste, I guess).

    Then added two very nice images that illustrate additional types of conductive metallic whisker-like and dendritic growth forms. See 'lightning rod effect' in the Lattice SlideShare document concerning the possibility of LENRs occurring in Lithium-ion batteries dated July 16, 2010.

    Thanks in advance for your interest in our work.

    Lew
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Lattice Energy LLC- Tin Whisker Shorting Problems Analogous to Li-ion Batteries-Jan 24 2012

  1. 1. Lattice Energy LLC Growth of conductive metallic “tin whiskers” and random electrical shortingevents implicated in Toyota’s uncontrollable vehicle acceleration safety problems Whisker shorting issue analogous to metallic dendrite shorting events that can causeLENRs which can then trigger super-hot, fast-burning metal oxidation fires in Li-ion batteries Other major difference from Li-ion batteries is frequency of occurrence: looks like potentialfor LENR triggering is 1 out of every ~5 million cells (battery manufacturer estimate) vs. est. of 140 whisker-related shorting failures per 1 million (= 700 per 5 million) Toyota vehicles Note: micron-scale LENRs very likely do not often occur in Toyota whisker micro-arcsReferences:“Lattice Energy LLC - Could LENRs be involved in some Li-ion battery fires? LENRs in advancedbatteries”Lewis Larsen, Lattice Energy LLC, July 16, 2010 [68 slides – not refereed]Discusses possibility that LENRs may be occurring in some indeterminate subset of Li-ion battery fireshttp://www.slideshare.net/lewisglarsen/cfakepathlattice-energy-llc-len-rs-in-liion-battery-firesjuly-16-2010“Toyotas Sudden Acceleration Problem May Have Been Triggered By Tin Whiskers”Sharon Carty, ReporterHuffington Post - first Posted: 01/22/2012 7:07 pm Updated: 01/23/2012 5:26 pmhttp://www.huffingtonpost.com/2012/01/21/toyota-sudden-acceleration-tin-whiskers_n_1221076.html“Toyota accelerations revisited—hanging by a (tin) whisker”Rick DeMeis, Editor of Automotive DesignlineEE Times - News and Analysis 1/10/2012 8:39 AM ESThttp://www.eetimes.com/electronics-news/4234309/Toyota-accelerations-revisited-hanging-by-a--tin--whisker“Electrical Failure of an Accelerator Pedal Position Sensor Caused by a Tin Whisker and Discussion ofInvestigative Techniques Used for Whisker Detection”H. Leidecker (NASA Goddard), L. Panashchenko (NASA Goddard), & J. Brusse (Dell Federal Govt Svcs)September 14, 2011 NASAhttp://nepp.nasa.gov/whisker/reference/tech_papers/2011-NASA-GSFC-whisker-failure-app-sensor.pdf Caught in the act! Image credit and source: above-cited NASA report Note electrical arc (spark) on Slide #17 emitted from the sharp tip of the tin whiskerJanuary 24, 2012 Copyright 2012, All Rights reserved Page 1
  2. 2. Lattice Energy LLC Example of lithium metal dendrites growing in Li-ion battery electrolyte Source: Lawrence Berkeley National Laboratory, APS March 17, 2010 Example of zinc whiskers growing on top of substrateJanuary 24, 2012 Copyright 2012, All Rights reserved Page 2

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