Lithium/fluorinated carbon batteries (Li/CF), which have the highest theoretical capacity, long shelf life, a wide operating temperature, safety and non-pollution, have been becoming the best potential storage batteries. Bamboo charcoal with high specific surface area and large layer spacing is suitable for preparing the fluorinated carbon material. By means of ameliorating the preparation process and gas-solid fluorination, the moderate output fluorinated bamboo charcoal was synthesized. Used for the cathode material of lithium battery, it also reveals the novel discharged voltage of 3V versus Li/Li+ electrode and the special capacity over 800 mAh⋅g-1.

Li/graphite fluoride (GFx) cells have been widely noticed during the past decades due to its highest theoretical capacity, high energy density, long shelf life, safety and a wide operating temperature range in primary lithium batteries. Bamboo charcoal is cheap and widely used carbon with high specific surface area and large layer spacing, which is suitable to be fluorinated to form carbon fluoride. Five products with varied fluorine and color were obtained by fluorinating bamboo charcoal under varied reaction conditions. FT-IR spectra of these FBCs were studied. The absorbance peak related to C-F band was involved into five Gaussian peaks, and the area of each peak was calculated. The specific discharge capacity of each product was measured by galvanostatic discharging at 0.01C rate. It is turned out that there is a positive linear relationship between the specific capacity and the percentage of the peak area related to semi-covalent covalent C-F, if the carbon in the products was removed. The discharge curves showed that the discharge process could be divided into three parts. The pure compound corresponding to the first part of the discharge is the target material we actually want.