Improved cycle life of Fe-substituted LiCoPO4

- LiCoPO4 is a potentially high energy Li-ion cathode (∼800 Wh kg−1) which is, however, prone to capacity fading.
- Fe2+/Fe3+-substituted LiCoPO4 has been shown to have strikingly less capacity fade than LiCoPO4.
- 500 charge-discharge cycles are demonstrated with ∼80% of the initial capacity at the final cycle.