X-ray　diffraction　experiments　and　accelerating　rate　calorimetry　on　the　reaction　of　fully　charged　Li[Co1-zAlz]O2　(0　≤　z　≤　0.15)　in　PC　(propylene　carbonate)　solvents　have　been　performed.　The　XRD　results　show　the　Li[Co1-zAlz]O2　samples　are　in　single　phase　and　lie　in　the　range　of　0　≤　z　≤　0.15.　The　lattice　constants　vary　smoothly　with　z　for　these　samples,　this　suggests　that　the　co-precipitation　method　can　produce　materials　with　a　uniform　cation　distribution　when　the　aluminum　content　is　between　0　and　0.15.　The　impact　of　Al　substitution　on　the　thermal　stability　of　LiCoO2　samples　was　studied　by　comparing　accelerating　rate　calorimetry　with　non　substituted　sample.　The　ARC　results　show　the　substitution　of　Al　improves　the　thermal　stability　of　the　samples.　According　to　thermal　kinetics　research,　the　improved　thermal　stability　is　caused　by　a　dramatic　reduction　in　the　frequency　factor　or　a　change　in　the　reaction　model　for　the　reaction.　©　2015　Elsevier　B.V.　All　rights　reserved.