Lithium polymer battery - Quiz
Lithium polymer battery
  • 1. How many main components does a typical LiPo cell have?
A) Four
B) Eight
C) Six
D) Two
  • 2. What is a common polymer used for the separator in a LiPo cell?
A) Polyurethane
B) Polystyrene
C) Polyethylene
D) Polyester
  • 3. What is the function of the polymer binder in the positive electrode?
A) Polypropylene
B) Lithium-transition-metal-oxide
C) Conductive additive
D) Poly(vinylidene fluoride)
  • 4. What material replaces lithium-metal-oxide in the negative electrode?
A) Polyethylene
B) Polypropylene
C) Carbon
D) Polyvinylidene fluoride
  • 5. What is the main difference between LiPo cells and lithium-ion cells?
A) Use of conductive additives
B) Physical phase of the electrolyte
C) Number of electrodes
D) Presence of a separator
  • 6. Which electrolytes are used in LiPo cells?
A) Dry solid or gel-like
B) Gaseous
C) Metal-based
D) Pure liquid
  • 7. What are the two large categories of polymer electrolytes?
A) Liquid and gaseous
B) Solid and liquid
C) Dry solid and gel polymer
D) Conductive and non-conductive
  • 8. Why does dry solid polymer electrolyte have poor ionic conductivity at room temperature?
A) Lack of lithium salts
B) Poor ion transfer due to physical phase
C) Presence of liquid electrolytes
D) High volatility
  • 9. What is added to dry solid polymer to improve ionic conductivity?
A) Gelled electrolyte
B) Polypropylene
C) Polyethylene
D) Solid metal
  • 10. How is a gel polymer electrolyte (GPE) formed?
A) Incorporating organic liquid in a polymer matrix
B) Heating the cell to high temperatures
C) Adding solid metal powder
D) Removing all liquid from the cell
  • 11. What is a major safety advantage of GPEs compared to liquid electrolytes?
A) Lower cost of production
B) Higher thermal stability and low volatility
C) Higher conductivity at room temperature
D) Increased mass of the battery
  • 12. What is the fully charged voltage of a typical LiPo cell?
A) 2.7 V
B) 3.6 V
C) 5.0 V
D) 4.2 V
  • 13. What is the nominal voltage for cells based on lithium-metal-oxides?
A) 2.7 V
B) 4.2 V
C) 3.6 or 3.7 V
D) 1.8 V
  • 14. What is the fully discharged voltage range for a typical LiPo cell?
A) 2.7–3.0 V
B) 1.8–2.0 V
C) 4.0–4.2 V
D) 3.6–3.7 V
  • 15. What is the fully discharged voltage for LiFePO4 based cells?
A) 4.2 V
B) 1.8–2.0 V
C) 3.6–3.7 V
D) 2.7–3.0 V
  • 16. What protects LiPo cells from overcharging or over-discharging?
A) Polymer binder
B) Electronic circuit
C) Separator
D) Conductive additive
  • 17. Why do LiPo battery packs have separate pin-outs for every cell?
A) To reduce internal resistance
B) To allow for faster manufacturing
C) To increase the total voltage
D) To monitor and balance the state of charge
  • 18. What are lithium salts dissolved in to provide ionic conductivity?
A) Polymer matrix
B) Separator film
C) Conductive additive
D) Carbon negative electrode
  • 19. Which material is used as a microporous film separator?
A) Lithium-metal-oxide
B) Carbon
C) Polypropylene
D) Poly(vinylidene fluoride)
  • 20. Which of the following is a common abbreviation for a lithium polymer battery?
A) LiPo
B) LiPolymerX
C) LiDry
D) LiSol
  • 21. What is an example of a polymer electrolyte mentioned in the text?
A) Ethylene carbonate
B) Lithium hexafluorophosphate
C) Diethyl carbonate
D) Polyacrylonitrile (PAN)
  • 22. What is a major advantage of polymer electrolytes over liquid ones?
A) Increased liquid leakage
B) Improved safety features
C) Lower manufacturing cost
D) Faster liquid convection
  • 23. In which applications are LiPo batteries typically used?
A) Stationary power plants
B) Heavy industrial machinery
C) Underground power grids
D) Weight-critical devices
  • 24. Who is credited with using dry SPE in prototype batteries around 1978?
A) Bellcore
B) Scrosati
C) Michel Armand
D) Nishi
  • 25. When were lithium polymer batteries first commercialized?
A) 1978
B) 1998
C) 2005
D) 1991
  • 26. What does Scrosati argue about gelled membranes?
A) They are strictly liquid batteries
B) They contain no liquid solvent
C) They are hybrid systems
D) They are pure dry electrolytes
  • 27. What name was given to the rechargeable lithium polymer cell announced by Bellcore in 1996?
A) Hybrid lithium cell
B) Gelled lithium-ion (GLi)
C) Plastic lithium-ion cell (PLiON)
D) Solid-state polymer unit
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