首页|(163079)Insights into electrochemical performances of NiFe_2O_4 for lithium-ion anode materials
(163079)Insights into electrochemical performances of NiFe_2O_4 for lithium-ion anode materials
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NSTL
Elsevier
Nano-structured metallic oxides and carbon composites (NiO@C, Fe_3O_4@C and NiFe_3O_4@C) are successfully fabricated by the low-temperature calcinations of Ni/Fe precursors in an inert atmosphere. Density functional theory calculations show that atom rearrangements of NiFe_3O_4@C in unit cells are observed with respect to NiO@C and Fe_3O_4@C, leading to the altered exposed crystal planes and oxygen atoms redistributions on these exposed planes. Likewise, the metallic electron distributions are also changed within NiFe_2O_4@C due to bimetallic synergistic effects. In such fabricated scheme with the terephthalic acid template, the unique morphologies and structural characteristics of NiFe_2O_4@C are obtained with oxygen-rich exposed crystal planes, which are conductive to improving the conductivity, accommodating volume changes, providing rapid electron and Li ion transportations. Compared with NiO@C and Fe_3O_4@C, the fabricated NiFe_2O_4@C as lithium ion anodes can achieve the extremely high discharge capacity of 1808.8 mAh g~(-1) at 100 mA g~(-1) impressive reversible capacity of 1153.6 mAh g~(-1) after 200 cycles at 500 mA g~(-1) and average capacity of 647.1 mAh g~(-1) at 5000 mA g~(-1). The full battery is also assembled by NiFe_2O_4@C and LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 as anode and cathode, and shows a superior high specific energy of 432.0 Wh kg~(-1), which is far higher (1.5 times) than commercial full batteries.
Transition bimetal oxidesOxygen-richLithium ion batteries anodeDensity functional theory computationsFull battery
Chao Yang、Cancan Peng、Peng Chen
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Hunan joint international laboratory of advanced materiab and technology for clean energy, College of Materials Science and Engineering, Hunan University, Changsha 410082, PR China
NSTL
Elsevier
