“…3e due to the excessive thickness of SEI and material inactivation. 42 In comparison, Fig. S13b reveals that a stable SEI film is formed for ZMC-H 2 sample with a low charge transfer resistance and no obvious additional semicircles is observed in the Nyquist plot after repeated cycles.…”
A rational synthesis route towards <5 nm transition metal-based nanodots confined in a highly porous carbon matrix is proposed without adding external carbon sources and applied for highly reversible lithium storage.
“…3e due to the excessive thickness of SEI and material inactivation. 42 In comparison, Fig. S13b reveals that a stable SEI film is formed for ZMC-H 2 sample with a low charge transfer resistance and no obvious additional semicircles is observed in the Nyquist plot after repeated cycles.…”
A rational synthesis route towards <5 nm transition metal-based nanodots confined in a highly porous carbon matrix is proposed without adding external carbon sources and applied for highly reversible lithium storage.
“…By contrast, this trend slows down significantly for ZnO-coated electrodes. The capacity decline between 1 and 0.01 V is smaller than that between 3 and 1 V, which is speculated that it is an energetically favoured lithium storage process rather than a kinetic one that dominates in the voltage range of 1–0.01 V [10,35]. Figure 3.Discharge–charge profiles of ( a ) pristine electrode LTOZnO00, ( b ) coated Li 4 Ti 5 O 12 composite electrodes LTOZnO05 (5 min) and ( c ) sputtered ZnO (20 min) film on Cu foil.…”
Oxide is widely used in modifying cathode and anode materials for lithium-ion batteries. In this work, a facile method of radio magnetron sputtering is introduced to deposit a thin film on Li4Ti5O12 composite electrodes. The pristine and modified Li4Ti5O12 electrodes are characterized at an extended voltage range of 3–0.01 V. The reversible capacity reaches a high level of 286 mAh g−1, which is a little less than its theoretical capacity (293 mAh g−1). Electrodes modified by ZnO thin films with various thickness show elevated rate capability and improved cycle performance.
“…Several coating materials have been proposed and reported [37][38][39]. Among them, SiO 2 is readily available, cheap and environmentally friendly material [40][41][42][43]. However, it is challenging to develop a homogenous SiO 2 coating on the surface of particles since it requires high heat treatment temperatures and additional heat treatment step, which significantly increase the processing cost.…”
Lithium-rich layered oxides (LLOs) such as Li1.2Ni0.13Mn0.54Co0.13O2 are suitable cathode materials for future lithium-ion batteries (LIBs). Despite some salient advantages, like low cost, ease of fabrication, high capacity, and higher operating voltage, these materials suffer from low cyclic stability and poor capacity retention. Several different techniques have been proposed to address the limitations associated with LLOs. Herein, we report the surface modification of Li1.2Ni0.13Mn0.54Co0.13O2 by utilizing cheap and readily available silica (SiO2) to improve its electrochemical performance. Towards this direction, Li1.2Ni0.13Mn0.54Co0.13O2 was synthesized utilizing a sol–gel process and coated with SiO2 (SiO2 = 1.0 wt%, 1.5 wt%, and 2.0 wt%) employing dry ball milling technique. XRD, SEM, TEM, elemental mapping and XPS characterization techniques confirm the formation of phase pure materials and presence of SiO2 coating layer on the surface of Li1.2Ni0.13Mn0.54Co0.13O2 particles. The electrochemical measurements indicate that the SiO2-coated Li1.2Ni0.13Mn0.54Co0.13O2 materials show improved electrochemical performance in terms of capacity retention and cyclability when compared to the uncoated material. This improvement in electrochemical performance can be related to the prevention of electrolyte decomposition when in direct contact with the surface of charged Li1.2Ni0.13Mn0.54Co0.13O2 cathode material. The SiO2 coating thus prevents the unwanted side reactions between cathode material and the electrolyte. 1.0 wt% SiO2-coated Li1.2Ni0.13Mn0.54Co0.13O2shows the best electrochemical performance in terms of rate capability and capacity retention.
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