Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7726965 | Journal of Power Sources | 2016 | 6 Pages |
Abstract
The use of LiCoPO4 as a Li-ion cathode material can enable high energy 5Â V batteries. However, LiCoPO4 shows limited cycle life and much less than theoretical energy density. In order to address these shortcomings, Fe, Cr and Si substituted-LiCoPO4(Cr,Si-LiCo0.9Fe0.1PO4) was investigated as an improved LiCoPO4 based cathode material. Fe substitution greatly improves the cycle life and increases the energy density. Cr substitution further increases the energy density, cycle life and rate capability. Si substitution reduces the reactivity of the cathode with electrolyte thereby increasing cycle life. In combination, the substituents lead to a LiCoPO4 based cathode material with no capacity fade over 250 cycles in Li/Cr,Si-LiCo0.9Fe0.1PO4 half cells, a discharge capacity of 140Â mAh gâ1 at C/3Â at an average discharge voltage of 4.78Â V giving an energy density of 670Â Wh per kg of cathode. In graphite/Cr,Si-LiCo0.9Fe0.1PO4 full Li-ion cells, the cathode material shows an energy density of 550Â Wh per kg of cathode material at 1C rate for the initial cycles and 510Â Wh per kg of cathode material at the 250th cycle.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Jan L. Allen, Joshua L. Allen, Travis Thompson, Samuel A. Delp, Jeff Wolfenstine, T. Richard Jow,