采用回流法制备出了蜂窝状的TiO2/石墨烯（GNs）复合材料.扫描电子显微镜（SEM）及透射电子显微镜（TEM）表征结果表明，TiO2颗粒约5~10 nm，均匀地分散在石墨烯的表面.锂电池测试显示，1C充电容量稳定在240.1 mAh?g-1；30C充电容量为169.5 mAh?g-1；当电流调回1C时，其充电容量仍可完全恢复（241.7 mAh?g-1）；10C 300周期循环电极容量保持率为89.8%.
秦琳琳
,
张焕
,
刘晓静
,
许剑辉
,
施一宁
,
郑明森
,
董全峰
. 功率型锂离子电池负极材料TiO2/石墨烯的制备及其电化学性能研究[J]. 电化学, 2012
, 18(3)
: 201
-204
.
DOI: 10.61558/2993-074X.2904
The honeycomb-like porous TiO2/graphenes (TiO2/GNs) nanocomposite was prepared by a reflux method. SEM and TEM results showed that nanosized anatase TiO2 (about 5~10 nm) were dispersed uniformly on the surface of the GNs. The TiO2/GNs composite showed excellent rate and cycling performance: A stable charge capacity of 169.5 mAh?g-1 was obtained at 30C, and can restore to 241.7 mAh?g-1 while current went back to 1C. The stable charge capacity of TiO2/GNs nanocomposite electrode up to 201.9 mAh?g-1 was achieved at 10C in the first cycle, and could be maintained at 181.4 mAh?g-1 after 300 times of cycling.
[1] Linsebigler A L, Lu G, Yates J T. Photocatalysis on TiO2 surfaces: principles, mechanisms, and selected results[J]. Chemical Review, 1995, 95(3): 735-758.
[2] Bach U, Lupo D, Comte P, et al. Solid-state dye-sensitized mesoporous TiO2 solar cells with high photon-to-electron conversion efficiencies[J]. Nature, 1998, 395(6702): 583-585.
[3] Xia Y Y. Review: Ti-based compounds as anode materials for Li-ion batteries[J]. Energy & Environmental Science, 2012, 5(5): 6652-6657.
[4] Sudant G, Baudrin E, Larcher D, et al. Electrochemical lithium reactivity with nanotextured anatase-type TiO2[J]. Journal of Materials Chemistry, 2005, 15(12): 1263-1269.
[5] Hu Y S, Kienle L, Guo Y G, et al. High lithium electroactivity of nanometer-sized rutile TiO2[J]. Advanced Materials, 2006, 18(11): 1421-1426.
[6] Lee D H, Park J G, Jin C K, et al. Preparation of brookite-type TiO2/carbon nanocomposite electrodes for application to Li ion batteries[J]. European Journal of Inorganic Chemistry, 2008, 2008(6): 878-882.
[7] Moriguchi I, Hidaka R, Yamada H, et al. A mesoporous nanocomposite of TiO2 and carbon nanotubes as a high-rate Li-intercalation electrode material[J]. Advanced Materials, 2006, 18(1): 69-73.
[8] Chen P C, Tsai M C, Chen H C, et al. Self-carbonized lamellar nano/micro hierarchical structure C/TiO2 and its Li-ion intercalation performance[J]. Journal of Materials Chemistry, 2012, 22(12): 5349-5355.
[9] Ding Y-H, Zhang P, Ren H-M, et al. Preparation of graphene/TiO2 anode materials for lithium-ion batteries by a novel precipitation method[J]. Materials Research Bulletin, 2011, 46(12): 2403-2407.
[10] Bong S, Kim Y R, Kim I, et al. Graphene supported electrocatalysts for methanol oxidation[J]. Electrochemistry Communications, 2010, 12(1): 129-131.
[11] Kamat P V. Graphene-based nanoassemblies for energy conversion[J]. The Journal of Physical Chemistry Letters, 2011, 2(3): 242-251.
[12] Wang C, Li D, Too C O, et al. Electrochemical properties of graphene paper electrodes used in lithium batteries[J]. Chemistry of Materials, 2009, 21(13): 2604-2606.
[13] Ding S, Chen J S, Luan D, et al. Graphene-supported anatase TiO2 nanosheets for fast lithium storage[J]. Chemical Communications, 2011, 47(20): 5780-5782.
[14] Wang D, Kou R, Choi D, et al. Ternary self-assembly of ordered metal oxide-graphene nanocomposites for electrochemical energy storage[J]. ACS Nano, 2010, 4(3): 1587-1595.
