Introduction to battery-management systems- COURSERA WEEK 02 QUIZ -1.2.4 ANSWERS

 

Introduction to battery-management systems- COURSERA WEEK 02 QUIZ -1.2.4 ANSWERS

Practice quiz for lesson 1.2.4

Total points 3

1.

Question 1

Which of the following are "layered" positive-electrode materials? Select all that apply.

1 / 1 point

Lithium nickel cobalt aluminum oxide ("NCA")

Correct

Yes. NCA is a layered positive-electrode material.

Lithium cobalt oxide (Li$_x$CoO$_2$, or "LCO")

Correct

Yes. LCO is a layered positive-electrode material.

Lithium iron phosphate (Li$_x$FePO$_4$, or "LFP")

Lithium nickel manganese cobalt oxide ("NMC")

Correct

Yes. NMC is a layered positive-electrode material.

Lithium manganese oxide (Li$_x$Mn$_2$O$_4$, or "LMO")

2.

Question 2

Which of the following statements are true regarding a comparison between NMC and LCO? Select all that apply.

1 / 1 point

Replacing some cobalt with nickel increases cell safety

Replacing some cobalt with manganese increases toxicity

Replacing some cobalt with nickel increases cell voltage

Correct

Yes. This is the principal reason that NMC cells incorporate nickel.

Replacing some cobalt with manganese decreases cost

Correct

Yes. Manganese is more common and less costly than cobalt.

3.

Question 3

Which of the following statements is not true regarding material structure?

1 / 1 point

1D structures tend to have least resistance, 3D structures tend to have highest resistance, and 2D structures tend to have intermediate resistance.

Layered materials can use only about half of their theoretic capacity reversibly.

Olivine materials have low voltage and their voltage contains very little state information

Spinel materials are inexpensive and non-toxic, but can degrade rapidly

Correct

Yes: this statement is false. In fact, 1D structures tend to have highest resistance. In order to overcome this general principle, 1D (olivine) materials must have small particle sizes to overcome this resistance.