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