Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 47, Pages 25013-25019Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202110177
Keywords
batteries; cycling; capacity increment; FeP@NC; particle refining; transmission electron microscopy
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Funding
- National Natural Science Foundation of China [22078319]
- DNL Cooperation Fund, CAS [DNL201914]
- Youth Innovation Promotion Association CAS [2021180]
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The study introduces a coral-like FeP@NC composite, which demonstrates ultra-stable cycling performance in sodium-ion batteries with a capacity retention of 82%. Through particle refinement and recombination, the FeP nanoparticles provide more active sites for Na+ storage, leading to an increase in capacity during cycling.
We present a coral-like FeP composite with FeP nanoparticles anchored and dispersed on a nitrogen-doped 3D carbon framework (FeP@NC). Due to the highly continuous N-doped carbon framework and a spring-buffering graphitized carbon layer around the FeP nanoparticle, a sodium-ion battery with the FeP@NC composite exhibits an ultra-stable cycling performance at 10 A g(-1) with a capacity retention of 82.0 % in 10 000 cycles. Also, particle refinement leads to a capacity increase during cycling. The FeP nanoparticles go through a refining-recombination process during the first cycle and present a global refining trend after dozens of cycles, which results in a gradually increase in graphitization degree and interface magnetization, and further provides more active sites for Na+ storage and contributes to a rising capacity with cycling. The capacity ascending phenomenon can also extend to lithium-ion batteries.
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