Manganese dioxide cathode in the presence of TiS2 as additive on an aqueous lithium secondary cell

Intercalation of lithium into the vacant sites of a host compound can be achieved electrochemically using nonaqueous electrolytes.

The use of aqueous electrolyte is less common because of the reactivity of many lithium intercalation compounds with water.

Here, we propose that lithium could be intercalated into the manganese dioxide cathode in a battery using saturated lithium

hydroxide as the electrolyte. The positive electrode reaction at MnO2 in this medium is shown to be lithium insertion rather than

the usual protonation, and acceptable rechargeability is observed. Using X-ray photoelectron spectroscopy and scanning electron

microscope analysis on the discharged cathode material we confirmed the presence of lithium ions in the host structure of MnO2.

Further, the incorporation of small amounts 3 wt % = weight percent of titanium disulphide TiS2 additive to the cell MnO2

cathode leads to a significant improvement in cell performance.