8. Batteries

• Why 2 forms do batteries come in?

  Rechargeable and non-rechargeable
• Give advantage of rechargeable batteries

  Cheaper initial costs
• Give a disadvantage of using non-rechargeable batteries

  Irreversible
• Give up advantage of rechargeable batteries

  Reversible and can last longer so cheaper in long-term
• Give an example of a rechargeable battery

  Lithium ion batteries
• Where are lithium ions batteries more commonly used?

  Wireless power tools, tablets, mobile phones, and electric cars
• What components are in the lithium ion cell which are used in mobile phones?

  • Electrode A - lithium cobalt oxide ( LiCoO2)
  • Electrode B - graphite (C)
  • Electrolyte - lithium salt dissolved in an organic solvent
• What is an electrolyte?

  The part of a battery that acts as a conductive pathway for ions to move from one electrode to another
• What is the negative electrode for a lithium ion cell?

  Li ~ Li+ + e-
• What is the positive electrode in a lithium ion cell?

  Li + +CoO2 + e- ~ Li+[CoO2]-
• What’s the overall equation on discharge for a lithium ion cell?

  Li + CoO2 ~ Li[CoO2]-
• How rechargeable batteries work?

  By plugging them in to supply a current. This current force electrons to flow in the opposite way.
• How do we show a battery recharging by using the discharge equation?

  Reverse the equation