[en] Li-CO${}_2$ batteries with a high theoretical energy density (1876 Wh kg${}^{-<!--\; ???\; -->1}$) have unique benefits for reversible carbon fixation for energy storage systems. However, due to lack of stable and highly active catalysts, the long-term operation of Li-CO${}_2$ batteries is limited to low current densities (mainly <0.2 mA cm${}^{-<!--\; ???\; -->2}$) that are far from practical conditions. In this work, it is discovered that, with an ionic liquid-based electrolyte, highly active and stable transition metal trichalcogenide alloy catalysts of Sb${}_{0.67}$Bi${}_{1.33}$X${}_3$ (X = S, Te) enable operation of the Li-CO${}_2$ battery at a very high current rate of 1 mA cm${}^{-<!--\; ???\; -->2}$ for up to 220 cycles. It is revealed that: i) the type of chalcogenide (Te vs S) significantly affects the electronic and catalytic properties of the catalysts, ii) a coupled cation-electron charge transfer process facilitates the carbon dioxide reduction reaction (CO${}_2$RR) occurring during discharge, and iii) the concentration of ionic liquid in the electrolyte controls the number of participating CO${}_2$ molecules in reactions. A combination of these key factors is found to be crucial for a successful operation of the Li-CO${}_2$ chemistry at high current rates. This work introduces a new class of catalysts with potential to fundamentally solve challenges of this type of batteries. (© 2024 The Authors. Advanced Energy Materials published by Wiley‐VCH GmbH)