Abstract
Lithium-ion batteries are among the most promising rechargeable batteries, due to their exceptional power and energy characteristics. However, they cannot meet the increasing demand from end-users for higher energy density. Herein, we reported a lithium-ion selenium battery by using lithiated graphite/silicon anode and microporous carbon/Se (MPC/Se) cathode with a fluoroethylene carbonate (FEC)-containing carbonate electrolyte. FEC additive enabled a stable MPC/Se cathode due to the suppressed dissolution of polyselenides into the electrolyte and improved the mechanical stability-integrity of graphite/silicon anode, leading to the formation of stable solid electrolyte interphase (SEI) layer on both the cathode and anode surfaces. As a result, lithium-ion selenium battery delivered a high specific capacity and excellent stability. The results showed a specific capacity of 356 mAh g-1 (normalized to Se) and Coulombic efficiency of 99.9% after 125 cycles for the full cells.
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