16.5: Recent Battery Technology

• What is an alkaline battery?


  A single cell (not really a battery), not rechargeable
• What is a battery?

  Packages of galvanic cells (one or more) used for electricity production and/or storage
• What is the positive terminal connected to?

  Negative terminal
• What is the negative terminal connected to?

  positive terminal
• Overall voltage of a battery is the sum of voltage of the individual cell
• Galvanic cells (spontaneous redox reactions) contain 1/2 cells with the same electrodes and same ions in solution but at different concentrations
• Electrolyte is the ionic conductor between the two half-cells
• The overall reaction of a galvanic cell is the combination of two half-reactions that occur simultaneously.
• What is a metal alloy?

  a substance that combines more than one metal or mixes a metal with other non-metallic elements
• What happens in non-rechargeable batteries?

  Electrolysis does not work
• High energy density usually achieved with solid reagents
• High current capacity achieved by using very large surface area electrodes (powders of jellyroll construction)
• What are four examples of practical batteries?


  Alkaline, NiMH, Lilon and Nalon
• Flow batteries (cells) are reagents pumped from tanks past electrodes
• Work hardening refers to...


  hardening of metals resulting from dislocations in the crystal pinning atoms in place
• Flow cells use colloidal solid oxidizers and reduces