Journal
ACS NANO
Volume 15, Issue 3, Pages 5679-5688Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c00924
Keywords
red phosphorus; carbon nanocages; high loading ratio; high systematic capacity; sodium-ion battery
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Funding
- National Science Fund for Distinguished Young Scholars [51625102]
- National Natural Science Foundation of China [51971065]
- Innovation Program of Shanghai Municipal Education Commission [2019-01-07-00-07-E00028]
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In this study, nanoscaled red phosphorus was encapsulated into conductive carbon nanocages to address the issues of red phosphorus in sodium-ion batteries. This design offers high loading capacity, excellent capacity retention, and high-rate performance.
Red phosphorus (RP) has attracted great attention as a potential candidate for anode materials of high-energy density sodium-ion batteries (NIBs) due to its high theoretical capacity, appropriate working voltage, and natural abundance. However, the low electrical conductance and huge volumetric variation during the sodiation-desodiation process, causing poor rate performance and cyclability, have limited the practical application of RP in NIBs. Herein, we report a rational strategy to resolve these issues by encapsulating nanoscaled RP into conductive and networked carbon nanocages (denoted as RP@CNCs) using a combination of a phosphorus-amine based method and evacuation-filling process. The large interior cavities volume of CNCs and controllable solution-based method enable the ultrahigh RP loading amount (85.3 wt %) in the RP@CNC composite. Benefiting from the synergic effects of the interior cavities and conductive network, which afford high structure stability and rapid electron transport, the RP@CNC composite presents a high systematic capacity of 1363 mA h g(-1) at a current density of 100 mA g(-1) after 150 cycles, favorable high-rate capability, and splendid long-cycling performance with capacity retention over 80% after 1300 cycles at 5000 mA g(-1). This prototypical design promises an efficient solution to maximize RP loading as well as to boost the electrochemical performance of RP-based anodes.
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