Li4Ti5O12/TiO2-SiO2 and Li4Ti5O12/SiO2 composites as an anode material for Li-ion batteries

Abstract

The commercial electrode Li 4 Ti 5 O 12 was modified with SiO 2 and TiO 2 -SiO 2 . All samples were characterized by scanning electron microscope (SEM), particle size distribution (PSD), porous structure parameters (low-temperature N 2 sorption), galvanostatic charge-discharge test, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). Appropriate amount of TiO 2 -SiO 2 and SiO 2 could effectively reduce the electrochemical polarization of Li 4 Ti 5 O 12 and enhance electrochemical reaction kinetics of Li + insertion/ deinsertion. Moreover, Li 4 Ti 5 O 12 /TiO 2 -SiO 2 provides a high rate capacity of 165 mAh g −1 at the high current density of 0.5 C. To investigate cycle stability of the electrode materials at high current density, the measurements were directly carried out at 3 C. SEM images of the LTO/TiO 2 -SiO 2 , LTO, and LTO/SiO 2 particles after galvanostatic charging/discharging show that they were coated by a uniform layer (the SEI layer).

Fast-Charging Anode Materials and Novel Nanocomposite Design of Rice Husk-Derived SiO2 and Sn Nanoparticles Self-Assembled on TiO2(B) Nanorods for Lithium-Ion Storage Applications

“…As demonstrated in eqs and , when the material was first discharged, amorphous SiO 2 was converted to Si and produced Li 2 Si 2 O 5 or Li 4 SiO 4 . , The irreversible Li 4 SiO 4 phase produced during the reaction required a significant capacity. As indicated in eq , the characteristic peaks associated with the reversible alloy/de-alloy reaction with Li + of Si include cathodic peaks of 0.19–0.21 V, which correspond to the transformation from Si to Li x Si, and anodic peaks of 0.52 V (Li x Si to Si) . Therefore, this reaction contributes to the electrode’s lithium storage capacity.…”

Polymer-templated mesoporous lithium titanate microspheres for high-performance lithium batteries

“…15,17,20,42 Differences between experimental and theoretical capacities during the initial discharge cycles are commonly justified by surface defects, irreversible lithium insertion, and contaminants like residual trace water common to high-surface area materials. 20,41,43,44 It is also possible that the differing pore structures have different electrolyte wettability and interconnectivity, limiting access to electrochemically active material, particularly in LTO-C.…”

Preparation and application of a high-temperature–resistant EVOH-SO3Li/PI fiber membrane with self-closing pores

“…Currently, the electronics industry is developing rapidly, and batteries play an indispensable role in electronic products. [4][5][6] Traditional batteries exhibit large energy consumption, significant environmental pollution, and short life. When compared with conventional batteries, environmentally harmful elements are absent in a lithium-ion battery, and this results in less pollution to the environment.…”