Novel hierarchically branched CoC2O4@CoO/Co composite arrays with superior lithium storage performance

He, Zhishun; Huang, Lican; Guo, Jianfeng; Pei, Shien; Shao, Haibo; Wang, Jianming

doi:10.1016/j.ensm.2019.07.037

Cited by 33 publications

(22 citation statements)

References 73 publications

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“…The b value, between 1 and 0.5, can be determined from the slope of log i vs. log v plots (Figure 7 b), which can reveal the related charge storage mechanism. Generally, b =1 represents behavior dominated by pseudocapacitance behavior whereas b =0.5 indicates a diffusion‐controlled process [50, 51] . In this work, the b values for the oxidation/reduction peaks of the pSiFe@C electrode were calculated to be 0.85 and 0.74, respectively, indicating that the storage of lithium ions is controlled by both surface pseudocapacitance behavior and diffusion process.…”

Section: Resultsmentioning

confidence: 74%

“…All Nyquist plots consist of a sloping line in the low‐frequency region and a depressed semicircle in the high‐to‐medium frequency range, which are ascribed to lithium‐ion diffusion and charge‐transfer processes, respectively [52–54] . In the inset of Figure 7 c, the equivalent circuit used to fit the Nyquist plots is presented, in which the corresponding impedance parameters R s , R ct , CPE, and Z w are the ohmic resistance of the overall electrode system, charge‐transfer resistance, interfacial capacitance (constant‐phase element) and diffusion impedance of the electrode system, [50–53] respectively. The parameters fitted according to the equivalent circuit are illustrated in Table S1.…”

Section: Resultsmentioning

confidence: 99%

“…where R , T , A , n , F , σ w , and c correspond to gas constant, absolute temperature, the specific surface area of the corresponding electrode, the number of electrons transferred per mole of active material, Faraday constant, Warburg impedance coefficient, and the molar concentration of lithium ions, respectively. σ w can also be calculated through Equation : [51, 55, 56]

true Z^{'} = R_{s} + R_{ct} + σ_{w} ω^{- 0.5}

…”

Section: Resultsmentioning

confidence: 99%

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Scalable Synthesis of Porous SiFe@C Composite with Excellent Lithium Storage

Gong

et al. 2021

Chemistry A European J

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Utilizing cost‐effective raw materials to prepare high‐performance silicon‐based anode materials for lithium‐ion batteries (LIBs) is both challenging and attractive. Herein, a porous SiFe@C (pSiFe@C) composite derived from low‐cost ferrosilicon is prepared via a scalable three‐step procedure, including ball milling, partial etching, and carbon layer coating. The pSiFe@C material integrates the advantages of the mesoporous structure, the partially retained FeSi2 conductive phase, and a uniform carbon layer (12–16 nm), which can substantially alleviate the huge volume expansion effect in the repeated lithium‐ion insertion/extraction processes, effectively stabilizing the solid–electrolyte interphase (SEI) film and markedly enhancing the overall electronic conductivity of the material. Benefiting from the rational structure, the obtained pSiFe@C hybrid material delivers a reversible capacity of 1162.1 mAh g−1 after 200 cycles at 500 mA g−1, with a higher initial coulombic efficiency of 82.30 %. In addition, it shows large discharge capacities of 803.1 and 600.0 mAh g−1 after 500 cycles at 2 and 4 A g−1, respectively, manifesting an excellent electrochemical lithium storage. This work provides a good prospect for the commercial production of silicon‐based anode materials for LIBs with a high lithium‐storage capacity.

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Section: Resultsmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 99%

true Z^{'} = R_{s} + R_{ct} + σ_{w} ω^{- 0.5}

…”

Section: Resultsmentioning

confidence: 99%

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Scalable Synthesis of Porous SiFe@C Composite with Excellent Lithium Storage

Gong

et al. 2021

Chemistry A European J

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“…In the subsequent CV tests, all the cathodic and anodic peak currents for Si gradually increase, which is ascribed to the electrode activation . It is noted that the two cathodic peaks shift to higher potentials in the second and third CV curves, resulting in the formation of the irreversible SEI film and amorphous silicon. , Sn–PSi@Sn-0.5h and Sn–PSi@Sn-8h show a similar CV behavior with Sn–PSi@Sn-4h (Figure S13a,b), and the PSi electrode presents a typical CV curve for Si (Figure S13c).…”

Section: Resultsmentioning

confidence: 78%

Metallic Tin Nanoparticle-Reinforced Tin-Doped Porous Silicon Microspheres with Superior Electrochemical Lithium Storage Properties

Hou

Guo

et al. 2021

ACS Appl. Energy Mater.

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Improving the electronic conductivity and drastic volume expansion is attractive and challenging for constructing high-performance Si-based anode materials for lithium-ion batteries. Herein, tin-doped porous silicon microspheres embedded with tin nanoparticles (Sn–PSi@Sn) are fabricated from easily available low-cost silicon–aluminum alloy precursors through a simple and scalable strategy with a chemical replacement/etching and a low-temperature annealing process. The 3D porous framework structure of Sn–PSi@Sn microspheres may buffer severe volume expansion during the electrochemical cycling and shorten the transport paths of Li+ ions. The doping of Sn atoms in the Si crystal lattice can lead to a lattice expansion in silicon, reinforce the electronic and ionic conductivities, and minimize the effect of Li trapping, which is advantageous for enhancing the rate performance and improving the initial Coulombic efficiency. The Sn nanoparticles anchoring in porous silicon microspheres may further improve the conductivity and structure stability of Sn–PSi@Sn composites. Based on the density functional theory calculation results, the effects of partial substitution of Sn into the Si lattice mentioned above have been successfully confirmed. As a consequence, the as-prepared tin-doped porous silicon microspheres embedded with tin nanoparticles show a high reversible capacity (1165.6 mA h g–1 at the 400th cycle at 1 A g–1), excellent rate properties (1433.4 mA h g–1 at a high rate of 2.5 A g–1), and superior cycling performance at an ultrahigh rate (910.9 mA h g–1 at the 500th cycle even at a high current density of 4 A g–1). This work provides a promising strategy to design high-performance anode composites.

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“…Meanwhile, the corresponding satellite peaks (Sat.) of Co 3 O 4 were detected at 796.7 and 786.2 eV [7e] . For the Zn 2p spectrum (Figure 6C.…”

Section: Resultsmentioning

confidence: 91%

Hollow Concave Zinc‐Doped Co₃O₄ Nanosheets/Carbon Composites as Ultrahigh Capacity Anode Materials for Lithium‐Ion Batteries

2021

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Composition‐structure strategy is an effective method to improve the electrochemical performance of lithium‐ion batteries (LIBs). Ideal active materials combined with unique structure can lead to potential candidates for next‐generation LIB anode materials. In this research, we designed a hollow concave Zn‐doped Co3O4 nanosheets/carbon composites as active electrodes for LIBs. The hollow concave structure could shorten the path length of Li+ and electron transfer. The interconnected Co3O4 nanosheets could construct a conductive network and enhance the composites’ conductivity. Moreover, defects produced by Zn doping in the Co3O4 phase improves the electronic structure of Co3O4, endowing superior electrochemical performances for the doped Co3O4‐based composites. As expected, the optimized hollow concave Zn‐doped Co3O4/C composites exhibited high specific capacities with stable cyclability (750 mA h g−1 at 500 mA g−1 after 300 cycles) and excellent rate performances (723.5 mA h g−1 at 3.0 A g−1).

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Novel hierarchically branched CoC2O4@CoO/Co composite arrays with superior lithium storage performance

Cited by 33 publications

References 73 publications

Scalable Synthesis of Porous SiFe@C Composite with Excellent Lithium Storage

Scalable Synthesis of Porous SiFe@C Composite with Excellent Lithium Storage

Metallic Tin Nanoparticle-Reinforced Tin-Doped Porous Silicon Microspheres with Superior Electrochemical Lithium Storage Properties

Hollow Concave Zinc‐Doped Co₃O₄ Nanosheets/Carbon Composites as Ultrahigh Capacity Anode Materials for Lithium‐Ion Batteries

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Novel hierarchically branched CoC2O4@CoO/Co composite arrays with superior lithium storage performance

Cited by 33 publications

References 73 publications

Scalable Synthesis of Porous SiFe@C Composite with Excellent Lithium Storage

Scalable Synthesis of Porous SiFe@C Composite with Excellent Lithium Storage

Metallic Tin Nanoparticle-Reinforced Tin-Doped Porous Silicon Microspheres with Superior Electrochemical Lithium Storage Properties

Hollow Concave Zinc‐Doped Co3O4 Nanosheets/Carbon Composites as Ultrahigh Capacity Anode Materials for Lithium‐Ion Batteries

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Hollow Concave Zinc‐Doped Co₃O₄ Nanosheets/Carbon Composites as Ultrahigh Capacity Anode Materials for Lithium‐Ion Batteries