Chemistry - Born Haber Cycles

Struggling to make sense of what your asking as you haven't specified whether its LE. Form. or Dissoc. Assuming you are talking about LE. Form, to make CaCl3; Ca must be 3+ - the energy required to put in to achieve the third ionization energy for Ca is so large it will make the LE.Form more exothermic. If you draw out the B-H cycle it will make more sense as you can see more steps are required to form the CaCl3. The lattice dissociation enthalpy however will be more endothermic for the same reason (More steps in the cycle). CaCl3 is more stable as the energy released from the formation is greater than the energy released from the formation of CaCl3, the more energy we have to absorb to make formation happen the less stable it will be.

https://www.youtube.com/watch?v=IM2JubP3agE

^ Can't remember at what point during the video, but E.Rintoul does explain exo/endothermic properties of ionic compounds and their stability very well.

Yoo
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