On safety of lithium-ion cells

Safety of lithium-ion cells is mainly related to thermal reactivity of the components. Active materials play a major role: carbon materials because th ey directly influence the kinetics of reactions at the negative electrode, positive materials because of their relation with their respective delithia tion state. Adequately substituted nickel based materials appear as the mos t stable positive materials. Electrolyte is mainly concerned through its re activity with lithium of LixC6 and with O-2 generated by the positive mater ials decomposition. Moreover, non-active materials, in particular binders, also clearly influence thermal stability and consequently safety behaviour of lithium-ion cells. (C) 1999 Elsevier Science S.A. All rights reserved.