Advanced Se₃P₄@C Anode with Exceptional Cycling Life for High Performance Potassium‐Ion Batteries

Abstract

Potassium‐ion batteries have attracted increasing attention for next‐generation energy storage systems due to their high energy density and abundance of potassium. However, the lack of suitable anode highly hampers its practical application due to the large ionic radius of K+. Herein, a Se3P4@mesoporous carbon (Se3P4@C) composite is reported as a high‐performance anode for potassium‐ion batteries. The Se3P4@C composite is synthesized through an in situ combination reaction between red phosphorus and Se within a porous carbon matrix. In this way, the nano‐sized Se3P4 is well confined in the porous carbon and thus exhibits a close contact with the carbon matrix. This can significantly improve the conductivity and alleviate the volume change during the cycling process. As a result, the Se3P4@C exhibits a high reversible initial capacity of 1036.8 mAh g−1 at a current density of 50 mA g−1 as well as an excellent cycle performance with a capacity decay of 0.07% per cycle over 300 cycles under 1000 mA g−1. In terms of high specific capacity and stable cycling performance, the Se3P4@C anode is a promising candidate for advanced potassium‐ion batteries.

Carbon‐based anode materials for potassium‐ion batteries: From material, mechanism to performance

“…The similar regularity and conclusion were revealed in the investigation of red P/C anode materials 98,101 . The potassium ion storage behavior of Sn 4 P 3 /C 96 and Se 3 P 4 /C 102 composite materials was investigated after alloying P with Sn and Se for the sake of further improving the electronic conductivity of P‐based materials. Actually, similar to K‐S batteries, Se could also alloy with K to provide the capacity, denoted as K‐Se batteries with moderate operating voltage.…”

Triethanolamine assisted synthesis of bimetallic nickel cobalt nitride/nitrogen-doped carbon hollow nanoflowers for supercapacitor

“…The ASC device delivers a maximum energy density of 32.4 W h Kg -1 at a power density of 851.3 W Kg -1 . Even at the maximum power density of 4254.5 W Kg -1 , the energy density is still 26 W h Kg -1 , surpassing other similar devices reported before such as Ni 3 N//PRPC-1k [52] , Co 3 N//AC [53] , B-Co 4 N-20/NF//AC/CF [54] , NiCo 2 S 4 //AC [55] , NiCo 2 O 4 @Bi 2 O 3 //AC [56] and Ni 0.85 Se|P//AC [57] [Figure 5H]. After 5000 cycles at 10 A g -1 , the ASC device exhibited ultrahigh capacitance retention of 95.8% [Figure 5I].…”

Potassium-ion batteries: outlook on present and future technologies

“…Moreover, the polypyrrole layer was further coated on the surface of P-activated carbon composite to offer a dual protection of red P material, so that the air stability and reversible capacities could be enhanced 366 . In addition, various metal phosphides are developed as PIB anodes, such as hierarchically porous carbon supported Sn4P3 367 , trigonal SnP@C 368 , SnP3/C nanocomposite 369 , yolk-shell structured FeP@C nanoboxes 303,370 , MoP@N/P-codoped carbon nanofibers 371 , and Se3P4@mesoporous carbon composite 372 . Among these compounds, the Se3P4@C composite obtains an excellent electrochemical performance as an anode material for PIBs 372 .…”

“…In addition, various metal phosphides are developed as PIB anodes, such as hierarchically porous carbon supported Sn4P3 367 , trigonal SnP@C 368 , SnP3/C nanocomposite 369 , yolk-shell structured FeP@C nanoboxes 303,370 , MoP@N/P-codoped carbon nanofibers 371 , and Se3P4@mesoporous carbon composite 372 . Among these compounds, the Se3P4@C composite obtains an excellent electrochemical performance as an anode material for PIBs 372 . An outstanding reversible initial capacity of 1036.8 mAh g -1 is obtained at 50 mA g -1 with an initial CE of 68.9%.…”