Hexagonal vs Rhombohedral Graphite: the Effect of Crystal Structure on Electrochemical Intercalation of Lithium Ions

Abstract
Graphite samples with different crystalline characteristics were evaluated as negative materials for lithium ion batteries. Conversely to non crystalline coke materials, they were found to experience exfoliation problems to a variable extent during the first electrochemical reduction process. A clear correlation was found between their rhombohedral phase content and their resistance to exfoliation.