In:
Physical Chemistry Chemical Physics, Royal Society of Chemistry (RSC), Vol. 25, No. 16 ( 2023), p. 11530-11544
Abstract:
Compared with monometallic selenides, bimetallic selenides have better synergistic effects and more abundant active sites for electrochemical reactions. As an important member of the transition metal oxide family, NiCoSe 2 has been widely used in energy storage devices and has shown excellent electrochemical performance. So in this paper, nitrogen-doped carbon decorated NiCoSe 2 composites (NiCoSe 2 /NC-700, NiCoSe 2 /NC-800, and NiCoSe 2 /NC-900) with a microflower structure were synthesized by calcining nickel–cobalt bimetallic organic skeleton materials at different temperatures, and were used as anode materials for rechargeable lithium-ion batteries. Because the MOF precursor has many advantages such as structural controllability, and a bimetal synergistic effect, the test results showed that the prepared NiCoSe 2 /NC composites have a special morphology, outstanding electrical conductivity, excellent lithium storage performance and electrochemical cycling performance in the process of being used as anode materials for lithium-ion batteries. The NiCoSe 2 /NC-800 materials displayed a high initial capacity (2099.8/1084.3 mA h g −1 ), and still maintained a high capacity (1041.2/989.9 mA h g −1 ) after 100 cycles at a current density of 0.1 A g −1 and in the voltage range of 0.01–3.0 V. In addition, at high current densities of 0.5 A g −1 and 1.0 A g −1 , the increased capacity of NiCoSe 2 /NC composites may be due to the activation of electrodes and the pseudocapacitance during cycling. Through ex situ XRD experiments, the lithium storage mechanism of the NiCoSe 2 /NC-800 electrode material during cycling was further studied, and NiCoSe 2 /NC-800 was continuously converted into Ni, Co, and Li 2 Se during cycling.
Type of Medium:
Online Resource
ISSN:
1463-9076
,
1463-9084
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
1476244-4
detail.hit.zdb_id:
1460656-2
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