SBA-15 confined synthesis of TiNb2O7 nanoparticles for lithium-ion batteries

Abstract

Unlike most conventional anode materials, the newly developed TiNb2O7 (TNO) does not form a solid electrolyte interface (SEI) layer, which makes it safe for high power requiring lithium-ion batteries. In this paper, we demonstrated an SBA-15 confined synthetic approach to prepare TNO nanoparticles (S-TNO) with a small particle size around 10 nm and a large BET surface area of 79.5 m(2) g(-1). It is worth mentioning that this is the smallest size reported so far for TNO. In contrast, the TNO (L-TNO) synthesized without SBA-15 has a particle size above 100 nm and a BET surface area of only 4.3 m(2) g(-1). The S-TNO shows better lithium-ion storage properties than L-TNO. The excellent electrochemical performance of S-TNO is attributed to its small crystalline size, which not only provides a larger effective area for better contact between the electrode material and the electrolyte, but also reduces the rate-limiting Li diffusion path. Moreover, S-TNO shows a high Coulombic efficiency (above 98% over 300 cycles) and negligible increase of impedance after cycling, which confirms no SEI layer formation in the operational voltage (1-3 V) of TNO.

TiNb2O7/Graphene hybrid material as high performance anode for lithium-ion batteries

“…6d shows the ragone plot, which clearly depicts the superiority of the TNO-TG nanocomposite over pristine TNO nanoparticles in terms of both energy and power densities of the material. The overall electrochemical performance of TNO-TG sample is superior to several TNO based electrodes reported in the literature [5,12,30]. Fig.…”

“…Cyclic voltammogram (Fig. 4b), obtained for TNO-TG electrode at a scan rate of 0.05 mVs -1 , showed sharp oxidation/reduction peaks at 1.67/1.50 V, attributed to the change of valency between Nb 5+ and Nb 4+ [5,28,29].…”

“…Recent reports on another Ti-based transition metal oxide, TiNb 2 O 7 , as an alternative anode material for lithium-ion battery, are very promising [5,[12][13][14][15][16][17][18][19][20]. TiNb 2 O 7 (TNO), with a layered monoclinic structure has Ti and Nb coordinated to six oxygen atoms each forming edge-shared and corner-shared octahedral with TiO 6 and NbO 6 [21].…”

“…In particular, lithium-ion battery, with its high gravimetric and volumetric capacities, has been dominating the portable electronics market and has recently been in the limelight for its vehicular applications [1][2][3][4][5]. However, challenges ahead are many, in the development of a safe and high power lithium battery that meets the growing energy demands, spanning the whole regime of applications from miniaturized devices to electric vehicles and power grids [6,7].…”

Porous TiNb2O7 Nanospheres as ultra Long-life and High-power Anodes for Lithium-ion Batteries

“…Their advantage is to avoid the formation of passivating solid-electrolyte interphase (SEI) layer [4]. Among these candidates [5][6][7][8][9][10][11][12][13][14][15], TiNb2O7 with a voltage platform at about 1.65 V has attracted considerable interests owing to the high theoretical capacity of 387.6 mA h/g [15][16][17][18][19][20][21][22][23][24][25][26]. However, the low ionic and electronic conductivity of TiNb2O7 materials have limited the electrochemical performance [15,16].…”