A poorly soluble organic electrode material for high energy density lithium primary batteries based on a multi-electron reduction.

Here we report an organic cathode material with poor solubility for lithium primary batteries, i.e. indeno[3,2-b]fluorene-6,12-dione. Each carbonyl group experiences a four-electron reduction to a methylene group, resulting in a high energy density of 1392 W h kg-1, which is among the best results for organic electrode materials.