Shedding Light on the Entropy Chang Found for the Transition Stage II to Stage I of Li-Ion Storage in Graphite

E. P. M LEIVA; E. PERASSI; D. BARRACO

JOURNAL OF THE ELECTROCHEMICAL SOCIETY

ELECTROCHEMICAL SOC INC

Año: 2017 vol. 164 p. 6154 - 6157

0013-4651

In order to examine the controversial hypothesis put forward to explain the entropy step experimentally observed for the stage II tostage I transition for lithium intercalation in graphite, a transparent statistical mechanical model is developed. The results obtainedshow that the entropy increase can be explained by the change of configurational entropy occurring at occupation of half of thelattice. Comparison with experimental data shows that attractive interactions between intercalated particles in the same layer mustbe assumed, in agreement with the ansatz made in the original experimental work