| 摘要 |
In an electrochemical secondary cell containing anhydrous electrolyte whose charging/discharging mechanism is based on reversible intercalation of active Li<+> ions by an electrode material having an open skeleton structure, the positive electrode is essentially a lithium-manganese spinel of the LiqMxMnyOz type which, provided 0 < x < 0.6 and 1.4 < y < 2.0, may contain up to 30% of other metals M, for example Co, in addition to Mn, while the negative electrode is based on a carbon product produced pyrolitically from organic compounds as host substance for the Li<+> ions. Limiting the Li concentration in the spinel lattice to a range in which the numerical values of the sliding parameter q are between 0 and 1.3 results in a low-lithium manganese spinel as positive electrode material. This spinel is responsible for the fact that, during discharge, the secondary cell delivers most of its capacity at a cell voltage of > 3 volts and that it also has a high cycle stability. |
