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Chitosan Derived Carbon Matrix Encapsulated CuP2 Nanoparticles for Sodium-Ion Storage
journal contribution
posted on 2019-03-08, 00:00 authored by Jian Duan, Shengyuan Deng, Wangyan Wu, Xiang Li, Haoyu Fu, Yunhui Huang, Wei LuoSodium-ion
batteries (SIBs) are more feasible for grid-scale applications
than their lithium-ion counterparts when abundant sodium resources
with an even geographic distribution are taken into consideration.
However, developing an anode presents a major challenge since the
standard graphite anode shows a limited Na-ion storage capacity. Here
we report a CuCl2/chitosan monolith derived CuP2/C composite where CuP2 nanoparticles are uniformly embedded
in the carbon matrix. The strong chemical bonding between electron
rich groups in chitosan and the heavy metal ion (Cu2+)
plays a key role for the synthesis of the homogeneous monolithic composite,
and chitosan derived carbon prevents Cu and CuP2 particles
from aggregation upon the following thermal reduction and phosphorization.
Benefiting from the synergistic effect of small particle size and
conductive carbon matrix, the CuP2/C composite, as an anode
for SIBs, delivers a high reversible capacity of 630 mAh/g at a current
density of 100 mA/g and a capacity retention ratio of 91% after 200
cycles, while bare CuP2 shows a rapid capacity decay within
50 cycles.
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SIB50 cyclesmetal ioncarbon matrixsodium resourcescapacity decaychitosangrid-scale applicationsgraphite anodeconductive carbon matrixChitosan Derived Carbon Matrix Encapsulated CuP 2 Nanoparticlesparticle sizecapacity retention ratioCuP 2 nanoparticlesNa-ion storage capacity200 cyclesCuP 2 particlesCuP 2Sodium-Ion Storage Sodium-ion batterieslithium-ion counterparts
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