Lithium/CFx batteries have long storage life and have wide applications in various fields from space exploration to medical electronics. Lithium/CFx battery shows highest theoretical capacity when compared to other primary batteries such as Li/SOCl₂ and Li/MnO₂ batteries. However, Li/ CFx batteries suffers from voltage delay, show lower open circuit voltage during initial discharge and do not perform well in high rate applications which may be due to intrinsically poor electronic conductivity of CFx cathode material Historically, while making the cathode, addition of carbon is done to improve the material conductivity and get a better performance but it decreases the discharge capacity.

Recently, many attempts have been made to improve efficiency of Li/CFx batteries by modifying CFx properties through various physical and chemical means from coating carbon on CFx surface to mechanochemical and chemical treatment. Use of some of these modified CFx   resulted in improved battery performance that included no voltage delays, better operating voltage and higher rate capabilities in comparison to standard Li/ CFx batteries.

In this paper, development of CFx from historical perspective to the present day will be briefly discussed. We shall also present a short review on  the recent attempts made by us and various other groups to modify properties of CFx for Li/CFx batteries. Use of modified CFx  looks very promising for improving the efficiency of Li/CFx batteries.