Electrochemical Performance of Zn/CF _<i>x</i> Primary Battery under Different Electrolytes

Fluorinated carbon (CF x ) is one of the most promising cathode materials for metal primary batteries. However, the usage of CF x cathode for zinc‐based batteries is relatively seldom reported. Herein, CF x is employed as the cathode material for Zn‐based primary batteries, and corresponding electrochemical performance under a series of aqueous electrolytes is also systematically investigated. The results reveal that among all the investigated electrolytes CF x exhibits the highest capacity with the value as high as 827 mAh g −1 under alkaline NaOH electrolyte environment, and corresponding maximum capacity can also reach 632, 607, 352, and 66 mAh g −1 under those weak alkaline (sodium and potassium salts) and weak acid (zinc salts) electrolyte environment. In addition to the high capacity, CF x also displays the best rate performance with a remarkable power density of 37607.19 W kg −1 at current density of 50 000 mA g −1 and the largest specific energy of 674 Wh kg −1 at rate of 100 mA g −1 under NaOH electrolytes. This work offers insights and guidance for the design of high‐performance Zn/CF x batteries, which are characterized by their low cost, excellent safety performance, and high‐power density.