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LITHIUM POLYMER BATTERIES DAVID AUSLENDER NICHOLAS FORTENBERRY Slide 2 Li-Po batteries differ from traditional Li-Ions primarily due to the polymer electrolyte Essentially, the anode and cathode is exactly the same as Li-Ion Although a polymer electrolyte is used, a gel has to be applied for the battery to be conductive A fully solid polymer batteries were tested in the 1970s, but could only conduct electricity at 60 and above This pouch, if unprotected, can be easily damaged which can result in a fire Introduction Slide 3 Applications Cell phones Laptops RC cars and planes Can be molded to fit into many different devices due to the soft polymer electrolyte Commonly seen in Apple products and other small-form laptop manufacturers The soft polymer electrolyte allows for the battery to be stored in a soft pouch, saving 20% in weight compared to the traditional hard-shell Li-Ion Has a low self-discharge rate [1] Self discharge is when an internal chemical reaction occurs that reduces the chemical potential of the battery without connections between the electrodes being made [3] [4] Slide 4 Battery Science When charging any type of Li- Ion type battery, special protection circuitry must be used to prevent battery damage [1] [4] Chemical Reaction (During discharge) Positive Electrode: Negative Electrode: Slide 5 2 Slide 6 Power and Energy Density [7] Battery Type Energy/Weight W.hr/Kg Energy/Volume W.hr/L Energy/US$ W.hr/$ Lithium-Polymer~100-265~500 (median)~2.25-3.25W.hr Lithium-Ion~100-265~450 (median)~2.5-3.5W.hr Lead-Acid~40~75 (median)~7W.hr This Energy Density advantage allows for more Li-Po cells to be stuffed into a single area due to the thin form Slide 7 Construction 2 Slide 8 Manufacturing 6 Slide 9 Energy Consumption 5 This graph indicates that the average electrical consumption of a home in AZ is approximately 14kW/year. This information is from Energy Information Administration Slide 10 Questions? Slide 11 References 1."All-Battery.com - Rechargeable Batteries & Chargers." All-Battery.com - Rechargeable Batteries & Chargers. N.p., n.d. Web. 02 Oct. 2015.. 2."Lithium Polymer (Li-Po)." Quest Batteries. Harding Battery Handbook for Quest Rechargeable Cells and Battery Packs, n.d. Web.. 3."Self Discharge." Wikipedia. Wikimedia Foundation, n.d. Web. 02 Oct. 2015.. 4.Lithium Polymer Etiquette: A Comprehensive Guide to Working with LiPo Web. 2 Oct. 2015. http://www.instructables.com/files/orig/FSL/SFAB/H5TUC3PC/FSLSFABH5TUC3PC.jpg http://www.instructables.com/files/orig/FSL/SFAB/H5TUC3PC/FSLSFABH5TUC3PC.jpg 5."Household Energy Use in Arizona." Web. 2 Oct. 2015..http://www.eia.gov/consumption/residential/reports/2009/state_briefs/pdf/az.pdf 6."Gensace Factory Tour - How Lipo Batteries Are Made." YouTube. YouTube, n.d. Web. 02 Oct. 2015..https://www.youtube.com/watch?v=loPv9XhSszQ 7.Short Primer on Batteries. Presentation. MIT 7 Oct. 2015. http://web.mit.edu/2.009/www/resources/mediaAndArticles/batteriesPrimer.pdf 8."BU-206: Lithium-polymer: Substance or Hype?" Battery University. N.p., n.d. Web. 2 Oct. 2015..http://batteryuniversity.com/learn/article/the_li_polymer_battery_substance_or_hype