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