Surface spinel and interface oxygen vacancies enhanced lithium-rich layered oxides with excellent electrochemical performances

Zhang, Gaige; Chen, Min; Li, Caixing; Wu, Binhong; Chen, Jiakun; Xiang, Wenjin; Wen, Xinyang; Zou, Dehui; Cao, Guozhong; Li, Weishan

doi:10.1016/j.cej.2022.136434

Cited by 43 publications

(23 citation statements)

References 59 publications

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“…According to the literature, − the lithium-ion diffusion coefficient (D) is in direct proportion to the slope of the fitting line. In particular, the fitting slope of the YS-SiO x /C@C electrode is the lowest, indicating the highest D in the electrode, which suggests the facilitated electrochemical reaction kinetics in the YS-SiO x /C@C electrode. − …”

Section: Resultsmentioning

confidence: 96%

Constructing a Yolk–Shell Structure SiO_x/C@C Composite for Long-Life Lithium-Ion Batteries

Luo

Zhang

et al. 2022

ACS Appl. Energy Mater.

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Silicon oxide is one of the most representative anode materials for lithium-ion storage. However, the poor conductivity of silicon oxide and the large volume expansion during the repeated lithium alloying/dealloying reaction have a huge impact on the cycle stability of the electrode. Here, we propose a design strategy for constructing a yolk−shell structure to enhance the electrochemical performance of the silicon oxidebased anode. Using a silane coupling agent as the raw material, organosilicon nanoparticles are prepared by hydrolysis and a selfcondensation reaction. Combining with polydiallyldimethylammonium chloride modification and polymethyl methacrylate coating, the SiO x /C@C composite with a yolk−shell structure (YS-SiO x /C@C) was obtained by one-step carbonization. The modification of polydiallyldimethylammonium chloride ensures the formation of a stable cavity during the pyrolysis process, which can effectively relieve the volume variation of the silicon oxide electrode, and the carbon shell can enhance the overall conductivity. As the anode of lithium-ion batteries, the YS-SiO x /C@C electrode showed outstanding electrochemical stability with a high specific capacity of 770 mAh g −1 and a Coulombic efficiency of 99% after 500 cycles (0.5 A g −1 ). This research provides a direction for the preparation of yolk−shell electrode materials and promotes further development of high-performance silicon oxide-based anodes.

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Section: Resultsmentioning

confidence: 96%

Constructing a Yolk–Shell Structure SiO_x/C@C Composite for Long-Life Lithium-Ion Batteries

Luo

Zhang

et al. 2022

ACS Appl. Energy Mater.

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“…Their initial charge and discharge profiles in Figure S2a–d show the typical charge and discharge characteristics of LLOs. The initial potential ramp corresponds to the activation of the LiMO 2 component, and the second potential plateau is related to the activation process of Li 2 MnO 3 . , From their profiles, the percentages of charge capacity from the C 2/ m phase activation could be estimated to be 43.72, 45.43, 42.21, and 40.68% for PL, Fe-doped, F-doped, and co-doped samples, respectively, as shown in Figure S2d. The Fe doping could escalate the capacity slightly from the C 2/ m phase activation.…”

Section: Resultsmentioning

confidence: 99%

“…The initial potential ramp corresponds to the activation of the LiMO 2 component, and the second potential plateau is related to the activation process of Li 2 MnO 3 . 17,18 From their profiles, the percentages of charge capacity from the C2/m phase activation could be estimated to be 43.72, 45.43, 42.21, and 40.68% for PL, Fe-doped, F-doped, and co-doped samples, respectively, as shown in Figure S2d. Figure S5 gives their experimental, simulated, and different XRD profiles.…”

Section: Resultsmentioning

confidence: 99%

Unveiling the Roles of Trace Fe and F Co-doped into High-Ni Li-Rich Layered Oxides in Performance Improvement

Mao

Tan

Fan

et al. 2023

ACS Appl. Mater. Interfaces

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High-Ni Li-rich layered oxides (HNLOs) derived from Li-rich Mn-based layered oxides (LRMLOs) can effectively mitigate the voltage decay of LRMLOs but normally suffered from decreased capacity and cycling stability. Herein, an effective, simple, and up-scalable co-doping strategy of trace Fe and F ions via a facile expanded graphite template-sacrificed approach was proposed for improving the performance of HNLOs. The trace Fe and F codoping can far more effectively improve both its rate capability and cycling stability in a synergistic manner compared to the introduction of individual Fe cations and F anions. The co-doping of Fe and F increased the Li−O bonds by a magnitude far larger than the summation of the increments by their individual doping, quite favorable for the performance. The trace Fe doping can escalate the capacity and enhance the rate capability significantly by increasing the components of lower valence transition metals to activate their redox reactions more effectively and improving both the electronic and ionic conduction. In contrast, trace F can improve the cycling stability remarkably by lowering the O 2p band top to suppress the lattice oxygen escape effectively which were revealed by density functional theory calculations. The co-doped cathode exhibited excellent cycling stability with a superior capacity retention of 90% after 200 cycles at 1 C, much higher than 64% for the pristine sample. This study offers an idea for synergistically improving the performance of Li-rich layered oxides by co-doping trace Fe cations and F anions simultaneously, which play a complementary role in performance improvement.

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“…34 Zhang et al synthesized interfacial oxygen vacancies-enhanced Li-richlayered oxide for Li-ion battery, delivered higher initial Coulombic efficiency, the best cycling stability, and rate capability. 35 Li et al prepared oxygen defect-rich MnO 2 ultrathin nanosheets for zinc-ion batteries, exposed markedly boosted electrochemical performance in capacity, rate performance, and cycling stability. 36 Wang et al reported oxygen vacancies-rich NiCo 2 O 4À4x nanowires as an effective HER catalyst with a low overpotential of 135.9 mV to reach 10 mA cm À2 and further demonstrated superior specific capacitance of 1002.2 F g À1 .…”

Section: Introductionmentioning

confidence: 99%

“…Fan et al fabricated oxygen‐vacancy rich MnO 2 nanowires @ NiMn x O y−δ nanosheets core‐shell heterostructure for supercapacitor, revealed a specific capacitance of 463.5 C g −1 at 1 A g −1 and demonstrating the superior cyclic stability 34 . Zhang et al synthesized interfacial oxygen vacancies‐enhanced Li‐rich‐layered oxide for Li‐ion battery, delivered higher initial Coulombic efficiency, the best cycling stability, and rate capability 35 . Li et al prepared oxygen defect‐rich MnO 2 ultrathin nanosheets for zinc‐ion batteries, exposed markedly boosted electrochemical performance in capacity, rate performance, and cycling stability 36 .…”

Section: Introductionmentioning

confidence: 99%

Impact of oxygen‐defects induced electrochemical properties of three‐dimensional flower‐like CoMoO ₄ nanoarchitecture for supercapacitor applications

Sivakumar

Raj

Kulandaivel

et al. 2022

Intl J of Energy Research

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The rational strategy to design the well-ordered morphology of the metal oxides with defective engineering and tailoring them into specific electrode fabrication can significantly improve their electrochemical properties for high-performance energy storage systems. Herein, we adopted an effective strategy to introduce oxygen-defect into the well-ordered three-dimensional flower-like CoMoO 4 nanoarchitecture. The Co-Mo precursor leads to the introduction of oxygendefects into the CoMoO 4 (rCMO) nanoarchitecture during the heat-treatment under an oxygen-controlled environment (argon). The oxygen-defects in the material could facilitate abundant electroactive sites and intrinsically enhance the conductivity and supercapacitor performance. The oxygen-defect CoMoO 4 (rCMO) exhibits a specific capacity of 531 mAh g À1 at a current density of 1 A g À1 compared to the pristine CoMoO 4 (CMO; ambient atmosphere) of 322 mAh g À1 under the same current density. Meanwhile, the fabricated hybrid supercapacitor (HSC) of rCMO//AC provides a maximum specific capacitance of 159 F g À1 . Further, it distributes an energy density of 49.87 Wh kg À1 at the power density of 845.45 W kg À1 with an excellent cyclic life of ~91.03% over 10 000 cycles.

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Surface spinel and interface oxygen vacancies enhanced lithium-rich layered oxides with excellent electrochemical performances

Cited by 43 publications

References 59 publications

Constructing a Yolk–Shell Structure SiO_x/C@C Composite for Long-Life Lithium-Ion Batteries

Constructing a Yolk–Shell Structure SiO_x/C@C Composite for Long-Life Lithium-Ion Batteries

Unveiling the Roles of Trace Fe and F Co-doped into High-Ni Li-Rich Layered Oxides in Performance Improvement

Impact of oxygen‐defects induced electrochemical properties of three‐dimensional flower‐like CoMoO ₄ nanoarchitecture for supercapacitor applications

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Surface spinel and interface oxygen vacancies enhanced lithium-rich layered oxides with excellent electrochemical performances

Cited by 43 publications

References 59 publications

Constructing a Yolk–Shell Structure SiOx/C@C Composite for Long-Life Lithium-Ion Batteries

Constructing a Yolk–Shell Structure SiOx/C@C Composite for Long-Life Lithium-Ion Batteries

Unveiling the Roles of Trace Fe and F Co-doped into High-Ni Li-Rich Layered Oxides in Performance Improvement

Impact of oxygen‐defects induced electrochemical properties of three‐dimensional flower‐like CoMoO 4 nanoarchitecture for supercapacitor applications

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Constructing a Yolk–Shell Structure SiO_x/C@C Composite for Long-Life Lithium-Ion Batteries

Constructing a Yolk–Shell Structure SiO_x/C@C Composite for Long-Life Lithium-Ion Batteries

Impact of oxygen‐defects induced electrochemical properties of three‐dimensional flower‐like CoMoO ₄ nanoarchitecture for supercapacitor applications