High-performance Li/Na hybrid-ion batteries with nonstoichiometric Li2.7V2.1(PO4)3/C as cathode material

A novel structure for Li/Na hybrid-ion batteries with unique two-stage electrochemical reactions is proposed, using nonstoichiometric Li2.7V2.1(PO4)(3)/C materials as the cathode and Na foil as the anode with a Li-ion electrolyte. A discharge specific capacity of 132.99 mAh.g(-1) is delivered at a current density of 100 mA.g(-1) in the range of 2.5-4.2 V. Besides, when the current density increases to 1000 mA.g(-1), the specific density can reach a value of 108.50 mAh.g(-1), which indicates superior rate performance. After 800 cycles, a discharge capacity of 87.11 mAh.g(-1) is still observed at 1000 mA.g(-1) in a voltage range of 3.0-4.3 V, maintaining a retention rate of 80.42%. This simple design strategy for Li/Na hybrid-ion batteries harvests the synergetic contribution of Li+ and Na+ ions and provides an efficient solution to further improve hybrid-ion battery performance. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

A novel structure for Li/Na hybrid-ion batteries with unique two-stage electrochemical reactions is proposed. This design strategy harnesses the synergistic contribution of Li+ and Na+ ions, providing an efficient solution to improve battery performance and achieve superior rate performance.