Hierarchical MnCo 2 O 4 constructed by mesoporous nanosheets@polypyrrole composites as anodes for lithium ion batteries

Zhai

Crystal Research and Technology

et al. 2017

Self Cite

Erythrocyte like MnCo 2 O 4 has been synthesized using a facile solvothermal method and sintering treatment. The obtained sample is constructed by many smaller nanocrystals and possesses high surface area, which can efficiently increase the contact area for electrode/electrolyte, shorten the pathway for Li + diffusion and buffer the volume variation during electrochemical cycling. Electrochemical investigations demonstrate that the erythrocyte like MnCo 2 O 4 exhibits good electrochemical performance. A specific capacity of 960 mAh g −1 can be achieved after 100 cycles at the current density of 200 mA g −1 .

Section: Resultssupporting

confidence: 91%

“…Similar result can be observed in our previous work, and the reaction process is illustrated in the following Eqs. . The FESEM image in figureb presents that the as‐prepared sample is composed of numerous erythrocyte like crystals.…”

Section: Resultsmentioning

confidence: 98%

Synthesis of erythrocyte like MnCo₂O₄ as anode for high performance lithium ion batteries

Zhai

Crystal Research and Technology

et al. 2017

Self Cite

“…[35][36][37][38][39][40][41] Furthermore, the last fitting peak appeared in different locations. [26,51] Moreover, the obvious peaks around 1064 and 1401 cm À 1 in FC0 and FCN are assigned to the CÀ C stretching bands [52][53][54] and in plane vibration of CÀ H, [55][56][57][58][59] respectively. [35,38] And the one located at 285.6 eV in FCN was indexed to CÀ O/CÀ N bonds, which due to sp 2 C atoms bonded to N. [36,42,43] Similar to the characterization results of C1s, the signal about N was detected only in FCN, which at binding energy of 400.1 eV and corresponding to pyrrolic N (nitrogen in a five-atom heterocyclic ring).…”

Section: Introductionmentioning

confidence: 99%

“…[46,[48][49][50] Furthermore, the bending vibration of OÀ H also observed at 1614 cm À 1 . [26,51] Moreover, the obvious peaks around 1064 and 1401 cm À 1 in FC0 and FCN are assigned to the CÀ C stretching bands [52][53][54] and in plane vibration of CÀ H, [55][56][57][58][59] respectively. The particular peak (1230 cm À 1 ) in FCN is considered to be derived from CÀ N stretching vibrations, which imply the nitrogen atoms were doped into the carbon skeleton.…”

Section: Introductionmentioning

confidence: 99%

Improved Electrochemical Performance of FeF₃ by Inlaying in a Nitrogen‐Doped Carbon Matrix

Zhu

et al. 2019

ChemElectroChem

FeF 3 is favored by researchers because of its high theoretical specific capacity and high voltage. It is expected to be utilized as a cathode material for lithium-ion batteries in the future. However, the poor electronic conductivity, inferior reaction kinetics, and severe volume expansion seriously prevents its practical application. Herein, a FeF 3 @N-doped carbon nanocomposite was successfully produced by in situ fluorination and dehydration. In addition, the nanocomposite showed a reversible capacity of 84.9 mAh g À 1 for 200th cycle after cycling at a high current of 2 C, which is approximately 300 times higher than that of bare FeF 3 . Benefitting from the N-doped carbon matrix, the composite electrodes exhibited minor transfer resistance (117.4 Ω, only 44.0 % of that of bare FeF 3 ) and very low polarization voltage (ca. 0.19 V). Meanwhile, it provided a buffer for volume expansion during the insertion of Li + and maintained cycling stability. This work can supply a simple pathway for designing ultrahigh-rate and long-life FeF 3 cathode materials.

“…To meet the growing requirement, various transition metal oxides (e. g. TiO 2 , ZnO, Co 3 O 4 , SnO 2 and NiO) have been exploited as anode materials due to their higher theoretical capacities . Furthermore, there has emerged a great interest in ternary cobalt‐based metal oxides such as ZnCo 2 O 4 , NiCo 2 O 4 , and MnCo 2 O 4 owing to the synergic effects of multiple metal species and complementarities during Li + insertion and extraction . ZnCo 2 O 4 (ZCO) is of particular interest for LIBs due to its high theoretical capacity, lower cost, and environmental friendliness.…”

Section: Introductionmentioning

confidence: 99%

Solvothermal Fabrication of Hollow Nanobarrel‐Like ZnCo₂O₄ Towards Enhancing the Electrochemical Performance of Rechargeable Lithium‐Ion Batteries

Wang

Chen

et al. 2017

ChemElectroChem

Hollow nanobarrel‐like ZnCo2O4 has been designed and synthesized by means of a simple solvothermal method and subsequent calcination. The obtained samples were systematically characterized by powder X‐ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high‐resolution transmission electron microscopy (HRTEM), N2 adsorption–desorption experiments and X‐ray photoelectron spectroscopy (XPS). This hollow structure could not only relieve the volume expansion effect, but also facilitate the diffusion of lithium ions. We obtained a reversible lithium storage capacity of 1350 mAh g−1 even after 300 cycles at a current density of 500 mA g−1 with a voltage window of 0.01–3.0 V. As‐prepared samples demonstrate the high reversible capacity and excellent cycle life. The good cycling capability and high rate performance suggest that the material will be an attractive anode material for lithium‐ion batteries.