Introduction to battery-management systems- COURSERA WEEK 02 QUIZ -1.2.3 ANSWERS

 Introduction to battery-management systems- COURSERA WEEK 02  QUIZ -1.2.3 ANSWERS

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Practice quiz for lesson 1.2.3

Total points 3

1.

Question 1

Which of the following is NOT a good candidate material to use in a lithium-ion negative electrode?

1 / 1 point

Silicon

Hard carbon

Graphite

Lithium cobalt oxide (LiCoO$_2$, or "LCO")

Lithium titanate oxide (Li$_4$Ti$_5$O$_{12}$, or "LTO")

Correct

Yes. LCO makes a good positive-electrode material, but its open-circuit potential is too high to make a good negative-electrode material (as you will learn in the next lesson!)

2.

Question 2

Which of the following statements is true regarding cells having lithium titanate oxide (Li$_4$Ti$_5$O$_{12}$, or "LTO") negative electrodes?

1 / 1 point

LTO cells can have extremely long lifetimes when compared with lithium-ion cells having different negative-electrode materials.

LTO cells are inexpensive to manufacture compared with lithium-ion cells having different negative-electrode materials.

LTO cells have higher energy density than lithium-ion cells having different negative-electrode materials.

LTO cells have higher per-cell open-circuit voltage than lithium-ion cells having different negative-electrode materials.

Correct

Yes. The high open-circuit potential of LTO inhibits growth of a solid-electrolyte interphase (SEI) layer, which is a principal degradation mechanism in most lithium-ion cells.

3.

Question 3

Which of the following is true regarding cells having silicon or silicon-containing negative electrodes?

1 / 1 point

The energy density of cells having silicon negative electrodes can be very high

The life of cells having silicon negative electrodes is usually very high

Electrode volume changes are minimized when using silicon or silicon-containing negative electrodes

Most lithium-ion cells presently used in applications have silicon or silicon-containing negative electrodes

Correct

Yes. This is the principal advantage of using silicon in negative electrodes, and is due to being able to store more Li per silicon atom than per carbon atom in graphite.