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