Anatase TiO2 nanoparticles for lithium-ion batteries

Abstract

International audienceAnatase TiO2 nanoparticles were prepared by a simple sol-gel method at moderate temperature. X-ray powder diffraction (XRD) and Raman spectroscopy revealed the exclusive presence of anatase TiO2 without impurities such as rutile or brookite TiO2. Thermogravimetric analysis confirmed the formation of TiO2 at about 400 °C. Particle size of about 20 nm observed by transmission electron microscopy matches well with the dimension of crystallites calculated from XRD. The electrochemical tests of the sol-gel-prepared anatase TiO2 show promising results as electrode for lithium-ion batteries with a stable specific capacity of 174 mAh g−1 after 30 cycles at C/10 rate. The results show that improvement of the electrochemical properties of TiO2 to reach the performance required for use as an electrode for lithium-ion batteries requires not only nanosized porous particles but also a morphology that prevents the self-aggregation of the particles during cycling

Recent advances in hierarchical anode designs of TiO2‐B nanostructures for lithium‐ion batteries

“…53 During Liinsertion into lattices at a high potential of $1.75 V, the symmetry of the anatase unit cell decreases, and when x = 0.5 (Li 0.5 TiO 2 -Li rich phase), its original I41/amd symmetry transforms into the orthorhombic Pmn21 space group due to the loss of symmetry in the direction. [57][58][59] Although the anatase polymorph can deliver a theoretical capacity of 168 mAh g À1 , its performance has been limited because of the high resistance and poor Li + / ion diffusivity at the electrode/electrolyte interface. [60][61][62][63][64] Unlike other polymorphs, TiO 2 -B is a unique anode material whose bulk and nanostructural forms can lithiate/delithiate through surface charge-transfer process (pseudocapacitive charging mechanism) and also Faradaic diffusion-controlled insertion processes.…”

Nanostructured Graphene Oxide-Based Hybrids as Anodes for Lithium-Ion Batteries

“…The capacity retention was 63% after 30 cycles. [322,323], which affects the cycling performance and rate capability. To overcome these drawbacks, researchers have tried to combine TiO 2 with high conductive carbonaceous substances such as graphene [324], GO [325], and rGO [326][327][328][329].…”

Pan‐Milling: Instituting an All‐Solid‐State Technique for Mechanical Metastable Oxides as High‐Performance Lithium‐Ion Battery Anodes

“…As the dominant power source for portable electronic devices and electric/hybrid vehicle, lithium‐ion batteries (LIBs) with high energy density, high power density, super‐long cycle life, and reliability are highly anticipated. Electrochemically active metal oxides (MOs) such as SnO 2 , [ 1 ] TiO 2 , [ 2,3 ] Mn 3 O 4 , [ 4 ] and Fe 3 O 4 [ 5 ] have attracted significant attention as promising anode materials owing to their high theoretical capacities and natural abundance. However, the low electronic conductivity (≈10 –12 S cm –1 ) of MOs is an impediment to its practical application, as a result of poor cycling stability and rate capability.…”