A Negative Active Material For A Lithium Battery And Method Of Manufacturing Thereof

An active metrarial for high-voltage negative electrodes (>IV vs Li) of secondary rechargeable lithium batteries is disclosed. Chemical composition is represented by the general formula Li2+v Ti3-w FexMyM’2O7-a+ where M and M are metal ions having an ionic radius between 0.5 and 0.8 A and forming an octahedral structure with oxygen, like Ti3+, Co2+, Co3+ , Ni2+, Ni3+, Cu2+, Mg2+, A 13+, In3+, Sn4+, Sb3,Sb5+, a is related to the formal oxidation numbers n and n’ of M and by the relatio9n 2 a=v+4w, 3x-ny’ z and the ranges of values are –0.5£V£0.5, 0£w £0.2, x>0, y+z>0 and x+y+z £0.7. The strueture is related to that of remsdellite for all the compositions, The negative active material is prepared by ceramics process wherein lithium oxide, titanium oxide, iron oxide, M and/or M oxide are used as starting material for synthesis, Inorganic or organic solid precursors of the oxides can also be used instead. After reacant dispersion the mixture is field. The resulting electrochemically active material provides low working voltage and capacity with excellent cyeling capabilities at both low and high current densities.

Patent Information

Applicants

Inventors

Specification

Documents

Application Documents

ERegister / Renewals Ceased