Li 1 Mn 2 O 4 (a = 8.2495 ) is cubic, whereas Li 2 Mn 2

Li₁Mn₂O₄ (a = 8.2495 Å) is cubic, whereas Li₂Mn₂O₄ is tetragonal (a = 5.653 and c = 9.329 Å). Suggest a reason for lower symmetry of Li₂Mn₂O₄. Calculate the volume change upon its formation from cubic Li₁Mn₂O₄ and state how that might impact the long-term performance of a cathode cycling between these two compositions.