Na2CoSiO4 as a novel positive electrode material for sodium-ion capacitors

Gao, Shuai; Zhao, Jiachang; Zhao, Yu; Wu, Yuandong; Zhang, Xiaozhu; Wang, Linlin; Liu, Xijian; Rui, Yichuan; Xu, Jingli

doi:10.1016/j.matlet.2015.06.038

Cited by 28 publications

(19 citation statements)

References 27 publications

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“…12 DFT studies of these structures report also a very small volume change (below 3%) upon complete desodiation. 12 Experimental studies are overall in agreement with the predicted structural stability, 15,18,19 observed only when control over impurities is achieved 14 . In 2011, Duncan and coworkers first successfully synthesised Na 2 MnSiO 4 (space group Pc) using a sol-gel method.…”

supporting

confidence: 77%

“…Notably, Na doping would improve the performance of a Li-based cathode due to this feature. 16 Na-based orthosilicates are also known to exhibit a greater structural stability upon cycling with respect to their lithium counterparts, 15,18 due to the high Na/Fe exchange barriers observed for equilibrium structures exhibiting a diamond-like arrangement of AO 4 (A = Fe, Si) tetrahedral blocks. 12 DFT studies of these structures report also a very small volume change (below 3%) upon complete desodiation.…”

mentioning

confidence: 99%

“…20 Chen and coworkers synthesised Na 2 MnSiO 4 following the same procedure, and measured a reversible capacity of 125 mA h g −1 , which is the first evaluation of electrochemical properties for Na-based orthosilicate cathodes. 11 More recently, Na 2 CoSiO 4 , prepared via hydrothermal method, was used as positive electrode material for Na-based capacitors 18 and sodium iron orthosilicate Na 2 FeSiO 4 was synthesized and reported to exhibit reversible electrochemical activity of 106 mA h g −1 . 15 The latter material is particularly attractive due to the natural abundance of both sodium and iron.…”

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confidence: 99%

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First-principles study of the structural stability and electrochemical properties of Na₂MSiO₄ (M = Mn, Fe, Co and Ni) polymorphs

Bianchini

Fjellvåg

Vajeeston

2017

Phys. Chem. Chem. Phys.

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Sodium orthosilicates NaMSiO (M = Mn, Fe, Co and Ni) have attracted much attention due to the possibility of exchanging two electrons per formula unit. They are also found to exhibit great structural stability due to a diamond-like arrangement of tetrahedral groups. In this work, we have systematically studied the possible polymorphism of these compounds by means of density functional theory, optimising the structure of a number of systems with different group symmetries. The ground state is found to be Pc-symmetric for all the considered M = Mn, Fe, Co, Ni, and several similar structures exhibiting different symmetries coexist within a 0.3 eV energy window from this structural minimum. The intercalation/deintercalation potential is calculated for varying transition metal atoms M. Iron sodium orthosilicates, attractive due to the natural abundance of both materials, exhibit a low voltage, which can be enhanced by doping with nickel. The diffusion pathways for Na atoms are discussed, and the relevant barriers are calculated using the nudged elastic band method on top of DFT calculations. Also in this case, nickel impurities would improve the material performances by lowering the barrier heights. Notably, the ionic conductivity is found to be systematically larger with respect to the case of lithium orthosilicates, due to a larger spacing between atomic layers and to the non-directional bonding between Na and the neighbouring atoms. Overall, the great structural stability of the material together with the low barriers for Na diffusion indicates this class of materials as good candidates for modern battery technologies.

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supporting

confidence: 77%

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confidence: 99%

mentioning

confidence: 99%

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First-principles study of the structural stability and electrochemical properties of Na₂MSiO₄ (M = Mn, Fe, Co and Ni) polymorphs

Bianchini

Fjellvåg

Vajeeston

2017

Phys. Chem. Chem. Phys.

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“…Table S1 shows the comparative energy performance of the Ni‐HCF∥graphene capacitor device with the reported Na‐ion capacitors and asymmetric capacitors. The obtained energy density is higher compared to that of recent works on Mn‐HCF∥Fe 3 O 4 /rGO hybrid capacitor device (27.9 Wh kg −1 ), Na 2 CoSiO 4 ∥AC hybrid capacitor device (12.4 Wh Kg −1 ), PB∥AC hybrid capacitor device (30 Wh kg −1 ), NaMnO 2 ∥NaTi 2 (PO 4 ) 3 /C battery (30 Wh kg −1 ), and some of the asymmetric supercapacitors . The cyclic stability of the Ni‐HCF∥graphene sodium ion hybrid capacitor device (given in Figure (F)) shows nearly 91 % of capacitance retention over 2000 cycles of charge‐discharge which revealed superior cyclic stability of the device …”

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confidence: 76%

A High‐Energy Aqueous Sodium‐Ion Capacitor with Nickel Hexacyanoferrate and Graphene Electrodes

et al. 2017

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Sodium‐ion capacitors have received much attention compared to lithium‐based systems, owing to the improved safety and earth abundancy. Here, we assembled an aqueous sodium‐ion capacitor by using nickel hexacyanoferrate and graphene as positive and negative electrodes, respectively, in 1 M Na2SO4 electrolyte. The fabricated capacitor can work in a wide potential window from 0 to 2 V, giving an energy density of 39.35 Wh kg−1 with better capacitance retention of about 91 %, even after 2000 cycles. Besides, the cost‐effective precursors as well as environmentally friendly and earth‐abundant electrolytes with high safety will ensure that the fabricated sodium‐ion capacitor system is suitable for next‐generation energy storage applications.

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“…For example, a NIC was fabricated using a Na 2 CoSiO 4 as the anode, an AC as the cathode, and an aqueous electrolyte, exhibiting a capacitance of 42 F g -1 and an energy density of 12.4 Wh kg -1 at a power density of 782.7 W kg -1 . The capacitance retention was 84% after 1500 cycles 137. Similarly, Na 2 MnSiO 4 showed satisfying performance as an anode electrode in aqueous-based NICs 138.…”

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confidence: 84%

Nickel cobaltite-based anode materials for sodium-ion capacitors

Yang¹

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While lithium-ion energy storage has found wide applications, the use of lithium ions as charge carrier has a number of issues, such as safety concerns and resource scarcity. In comparison with lithium, sodium is naturally abundant and cheaper. Therefore, recent years have seen a great deal of research interest in using sodium ions as charge carrier to develop sodium-ion energy storage technologies, such as sodium-ion batteries (NIBs) and sodiumion capacitors (NICs). NICs have emerged as a promising technology for large-scale energy storage applications because this energy storage system combines the advantages of batteries and electrochemical capacitors (ECs). A NIC cell is configured with a battery electrode as the anode, an EC electrode as the cathode and an electrolyte containing sodium ions.However, finding a high-performance anode material has been one of the great challenges in developing this sustainable electrochemical energy storage technology. Transition-metal oxides (TMOs), such as TiO 2 , Nb 2 O 5 , NiCo 2 O 4, and Fe 3 O 4 , have been demonstrated to be promising anode materials for sodium-ion storage. Nickel cobaltite (NiCo 2 O 4 ) is of particular importance because of its low cost, abundance in nature, and high theoretical specific capacity (890 mAh g -1 ). However, this material suffers from critical problems, including sluggish sodium ion diffusion kinetics, low electrical conductivity, and large volume changes during charge/discharge, resulting in poor rate capability and cycling stability in NICs.This PhD thesis project aims to improve the electrochemical properties of NiCo 2 O 4 (NCO) with regard to a number of physical and electrochemical aspects, including morphology, structure, electrical conductivity, ion diffusivity, and cycling stability. The main innovations and key findings in this thesis work include:• Spherical NCO particles have been synthesized by using a solvothermal method. It was found that subsequent thermal treatment temperature played an important role in determining the crystalline structure and particle size of the NCO. The NCO sample thermally treated at 350 o C showed an optimal and promise performance in NICs. Hollow NCO spheres with a chestnut shell morphology have also been synthesized using the solvothermal method. VII

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Na2CoSiO4 as a novel positive electrode material for sodium-ion capacitors

Cited by 28 publications

References 27 publications

First-principles study of the structural stability and electrochemical properties of Na₂MSiO₄ (M = Mn, Fe, Co and Ni) polymorphs

First-principles study of the structural stability and electrochemical properties of Na₂MSiO₄ (M = Mn, Fe, Co and Ni) polymorphs

A High‐Energy Aqueous Sodium‐Ion Capacitor with Nickel Hexacyanoferrate and Graphene Electrodes

Nickel cobaltite-based anode materials for sodium-ion capacitors

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Na2CoSiO4 as a novel positive electrode material for sodium-ion capacitors

Cited by 28 publications

References 27 publications

First-principles study of the structural stability and electrochemical properties of Na2MSiO4 (M = Mn, Fe, Co and Ni) polymorphs

First-principles study of the structural stability and electrochemical properties of Na2MSiO4 (M = Mn, Fe, Co and Ni) polymorphs

A High‐Energy Aqueous Sodium‐Ion Capacitor with Nickel Hexacyanoferrate and Graphene Electrodes

Nickel cobaltite-based anode materials for sodium-ion capacitors

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First-principles study of the structural stability and electrochemical properties of Na₂MSiO₄ (M = Mn, Fe, Co and Ni) polymorphs

First-principles study of the structural stability and electrochemical properties of Na₂MSiO₄ (M = Mn, Fe, Co and Ni) polymorphs