Improved electrochemical performance of SiO2-coated Li-rich layered oxides-Li1.2Ni0.13Mn0.54Co0.13O2

Abstract

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.

Deposition of Thick SiO2 Coatings to Carbonyl Iron Microparticles for Thermal Stability and Microwave Performance

“…Protective coatings based on silica prevent direct contact between material and the oxidizing environment, display an improved thermal stability behavior that does not depend on the choice of the source precursor of Si [ 22 ]. For instance, the onset temperature of lithium-rich layered oxides coated with SiO 2 utilizing a sol–gel process shifts from 217.84 for uncoated material to 245.78 °C [ 54 ]. Furthermore, nanocomposite AlCr(Si)N protective coatings with increasing Si-content protect against oxidization [ 55 ].…”

“…Herein, the presence of SiO 2 -coating on the carbonyl iron particles prevents the diffusion of oxygen oxidation from the coating surface to the iron core during the early stages of oxidation [ 54 , 55 ]. That displacement of the peak toward the higher temperatures (see Figure 10 B–D), enhances the thermal stability by 5% and, also, the hydrophobicity [ 56 ] and corrosion resistance [ 19 ].…”

Minimizing ion/electron pathways through ultrathin conformal holey graphene encapsulation in Li- and Mn-rich layered oxide cathodes for high-performance lithium-ion batteries

“…Various materials, including oxides such as Li 3 PO 4 , MgO, SiO 2 , TiO 2 , ZrO 2 , ZnO, AlPO 4 , and MnO 2 , have been extensively investigated for their potential as coating materials for cathode particles. [10][11][12][13][14][15][16][17] However, although these coating materials improve the surface stability of the cathode particles, they exhibit low electrical conductivity. 18 To address this limitation, researchers have explored coating methods using highly conductive materials such as carbon.…”

Surface Grafting SiO2 on Lithium-Rich Layered Oxide Cathode Material for Improving Structural Stability

“…Lee et al 33 reported that 0.25 wt.% SiO 2 -coated ternary LiNi 0.8 Co 0.1 Mn 0.1 O 2 electrodes demonstrated significantly better cyclic and thermal stability (84.5% after 100 cycles at 0.5 C). Chen et al 34 prepared SiO 2 coated Ni rich layered LiNi 0.5 Co 0.2 Mn 0.3 O 2 in SiO 2 powder suspension, and the capacity retention of optimized 0.5 wt% SiO 2 -coated sample reached 82.5% after 100 cycles at 0.1 C. Abraham et al 36 reported the surface modification of Li 1.2 Ni 0.13 Mn 0.54 Co 0.13 O 2 of homogeneous SiO 2 layer utilizing dry ball milling technique. As a result, the SiO 2 -coated layered cathodes exhibited enhanced electrochemical z E-mail: huihuanghan@kmust.edu.cn; heyapeng@kmust.edu.cn performances in terms of capacity retention and cycling stability for the primary sample benefitting from the prevention of electrolyte decomposition and unwanted side reactions.…”