Impact of the Specific Surface Area on the Memory Effect in Li-Ion Batteries: The Case of Anatase TiO2

Nanosize anatase TiO2 powders have been synthesized by hydrothermal synthesis by using technical grade TiOSO4 as precursor and urea as precipitating agent. The initial pressure of the reaction system was set at 6 MPa. Stirring speed was fixed at 300r/min. The reaction system reacted at the temperature ranged from 110 to 150°C for holding 2hrs to 8hrs and the concentration of the precursor was ranged from 0.25M to1.5M. XRD patterns show that the synthesized powders are in the form of anatase phase. Calculated grain size is ranged from 6.7 to 8.9nm by Scherrer method from the line broadening of the (101) diffraction peak of anatase. The specific surface area of the powders synthesized under different conditions is ranged from 124 to 240m2/g. The grain size of the powders increases with the increase of the reaction temperature, holding time and precursor concentration, respectively. The specific surface area decreases with the increase of reaction temperature and holding time, and does not obviously change with the change of precursor concentration when the concentration of the precursor is less than 1M. However, when the concentration is higher than 1M, the specific surface area will decrease quickly with the increase of the precursor concentration. XRD and DSC-TG analysis shows that the synthesized anatase TiO2 will begin to transform to rutile TiO2 at about 840°C. When heated to 1000°C for holding 1h, the anatase powders will transform to rutile completely.

Download Full-text

Ultrastable Li-ion battery anodes by encapsulating SnS nanoparticles in sulfur-doped graphene bubble films

Nanoscale ◽

10.1039/c9nr10608a ◽

2020 ◽

Vol 12 (6) ◽

pp. 3941-3949 ◽

Cited By ~ 4

Author(s):

Bing Zhao ◽

Daiyun Song ◽

Yanwei Ding ◽

Juan Wu ◽

Zhixuan Wang ◽

...

Keyword(s):

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Flake Graphite ◽

Li Ion Battery ◽

Doped Graphene ◽

Li Ion

SnS nanoparticles are encapsulated into sulfur-doped graphene bubble film presenting a flake-graphite-like structure. The closely packed SnS@G composite shows much lower specific surface area, smaller irreversible Li+ consumption.

Download Full-text

Micro-mesoporous anatase TiO2 nanorods with high specific surface area possessing enhanced adsorption ability and photocatalytic activity

Microporous and Mesoporous Materials ◽

10.1016/j.micromeso.2016.08.015 ◽

2016 ◽

Vol 235 ◽

pp. 185-194 ◽

Cited By ~ 24

Author(s):

T.V. Gerasimova ◽

O.L. Evdokimova (Galkina) ◽

A.S. Kraev ◽

V.K. Ivanov ◽

A.V. Agafonov

Keyword(s):

Photocatalytic Activity ◽

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

High Specific Surface Area ◽

Anatase Tio2 ◽

Tio2 Nanorods ◽

Adsorption Ability ◽

Enhanced Adsorption

Download Full-text

Influence of Synthesis Condition on N2 Adsorption Characteristics of Anatase TiO2 Particles Prepared in an Aqueous Solution

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.388.103 ◽

2008 ◽

Vol 388 ◽

pp. 103-106

Author(s):

Yoshitake Masuda ◽

Kazumi Kato

Keyword(s):

Aqueous Solution ◽

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Anatase Tio2 ◽

N2 Adsorption ◽

Tio2 Particles ◽

Bet Specific Surface Area ◽

Desorption Isotherms ◽

Adsorption Desorption

TiO2 was crystallized to form particles in aqueous solutions containing ammonium hexafluorotitanate and boric acid. XRD diffraction patterns indicated they were in a single phase of anatase TiO2. TiO2 particles prepared at 90 °C exhibited N2 adsorption-desorption isotherms of type IV. BET specific surface area of the particles was estimated to 13 m2/g. On the other hand, TiO2 particles prepared at 50 °C exhibited N2 adsorption-desorption isotherms of type I. BET specific surface area of the particles was estimated to 168 m2/g. Crystal growth of TiO2 was strongly affected by synthesis temperature. Nano-sized pores or surface structure of TiO2 particles prepared at 50 °C would increase N2 adsorption volume to realize high BET specific surface area. Additionally, aqueous solution process described here had an advantage that TiO2 crystallized at ambient temperature. Anatase TiO2 was prepared without annealing at high temperature which caused aggregation of particles and disappearance of surface nanostructures. The particles with large surface area can be thus utilized for catalyst, cosmetic, photocatalyst, dye-sensitized solar cell or sensors.

Download Full-text

Fabrication of Mesoporous C60/Carbon Hybrids with 3D Porous Structure for Energy Storage Applications

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2021.19141 ◽

2021 ◽

Vol 21 (3) ◽

pp. 1483-1492

Author(s):

Arun V. Baskar ◽

Jefrin M. Davidraj ◽

Ajanya M. Ruban ◽

Stalin Joseph ◽

Gurwinder Singh ◽

...

Keyword(s):

Specific Surface ◽

Porous Structure ◽

Surface Area ◽

Specific Surface Area ◽

Hybrid Materials ◽

Current Density ◽

Specific Capacity ◽

3D Structure ◽

Li Ion Battery ◽

Li Ion

We report on the synthesis of 3D mesoporous fullerene/carbon hybrid materials with ordered porous structure and high surface area by mixing the solution of fullerene and sucrose molecules in the nanochannels of 3D mesoporous silica, KIT-6 via nanotemplating approach. The addition of sucrose molecules in the synthesis offers a thin layer of carbon between the fullerene molecules which enhances not only the specific surface area and the specific pore volume but also the conductivity of the hybrid materials. The prepared hybrids exhibit 3D mesoporous structure and show a much higher specific surface area than that of the pure mesoporous fullerene. The hybrids materials are used as the electrodes for supercapacitor and Li-ion battery applications. The optimised hybrid sample shows an excellent rate capability and a high specific capacitance of 254 F/g at the current density of 0.5 A/g, which is much higher than that of the pure mesoporous fullerene, mesoporous carbon, activated carbon and multiwalled carbon nanotubes. When used as the electrode for Li-ion battery, the sample delivers the largest specific capacity of 1067 mAh/g upon 50 cycles at the current density of 0.1 A/g with stability. These results reveal that the addition of carbon in the mesoporous fullerene with 3D structure makes a significant impact on the electrochemical properties of the hybrid samples, demonstrating their potential for applications in Li-ion battery and supercapacitor devices.

Download Full-text

Hydrothermally Synthesized Li4Ti5O12 Nanotubes Anode Material with Enhanced Li-Ion Battery Performances

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2019.16668 ◽

2019 ◽

Vol 19 (11) ◽

pp. 7387-7391 ◽

Cited By ~ 7

Author(s):

Xiao-Chong Zhao ◽

Pan Yang ◽

Tao Ding ◽

Li-Jun Yang ◽

Xianmin Mai ◽

...

Keyword(s):

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Hollow Structure ◽

High Specific Surface Area ◽

High Rate ◽

Li Ion Battery ◽

Initial Discharge ◽

Li Ion ◽

Improved Performance

Hollow Li4Ti5O12 nanotubes were synthesized by stirring in a heated oil bath using P25 as titanium source and lithium hydroxide as lithium source. The as-prepared samples displayed a nanotube structure, with diameter of about 20~50 nm and length of 0.4 μm. The specific surface area of as-prepared samples reached 153.2 m2g−1. It is demonstrated that the Li4Ti5O12 nanotubes with improved performance can be obtained by hollow structure and high specific surface area. In consequence, it delivered a high reversible initial discharge capacity of 174.2 mAh g−1 at 0.5 C rate. A stable capacity of 170.9 mAh g−1 was delivered when the rate was reduced back to 0.5 C, suggesting good structural stability of the nanocable, high reversibility even after high rate charge– discharge, and good cycle stability. In addition, a capacity of 134.9 mAh g−1 and 98 mAhg−1 could be retained at a high rate of 5 C and 10 C, indicating excellent rate performances.

Download Full-text