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1. Nanostructured Titania Bronze Anode Composite for High Capacity Lithium-ion Batteries
Among battery technologies optimized for both energy and power density, lithium ion batteries have a clear edge over other devices. Titania Bronze (“TiO2(B)”) is a new anode material attracting growing interests due to safety, high discharge capacity, stable voltage, and high rate over long cycles. TiO2(B) is not yet produced in manufacturing scale due to the present complex synthesis. Our research adopts a templateless synthesis to obtain mesoporous TiO2(B) with nanosize control and includes integration with Li4Ti5O12 to achieve synergistic performance, including enhanced ionic and electronic conductivity through increased grain boundary density; improved stability; high capacity and superior high rate performance. The developed Li4Ti5O12/TiO2(B) composite (LTO-TB) doubles the discharge capacity of commercial Li4Ti5O12 and maintains 93 % discharge capacity retention over 1000 cycles at 10 C. The desirable performance metrics of high capacity and cyclability at high rates of charge/discharge makes the developed composite a promising next-generation anode material, with good opportunity to extend applications and markets of lithium ion batteries.
2. Metal Oxide Composites for High Capacity and Durable Sodium-ion Batteries
Sodium-ion batteries are potential candidates to substitute lithium-ion batteries in large-scale electrical energy storage applications, such as stationary storage for renewable energy production. Until now, there is no general consensus of next generation anode material for sodium ion batteries. Sodium titanates are among one of the promising anode materials. Utilizing the complementary high theoretical capacity of Na2Ti3O7 and the extended cyclability of Na2Ti6O13, we develop a scalable, template-free and surfactant-free production of Na2Ti3O7/Na2Ti6O13 via low temperature solid-state reaction to tune the composition and structure in multiple length scales to optimize kinetics, electrons and ion transport. The Na2Ti3O7/ Na2Ti6O13 nanorods demonstrate superior performance over conventionally synthesized Na2Ti3O7 irregular particles, with ~80 % capacity retention over 100 cycles at 5 C. This synthesis method opens up a facile route to synthesize 1D nanostructured metal oxides and fine-tune the composition and morphology according to performance demands.
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Bin Qin,Liubin Wang, Chi Kin Jenkin Tsui,Ching-Kit Ho,Wai-Yu Ashley Lam,Fujun Li,Chi-Ying Vanessa Li,Guanhua Chen,Kwong-Yu Chan
ENERGY & FUELSno. 6 (2024): 5522-5533
ACS omegano. 13 (2023): 12362-12371
Yingguang Zhang,Chi-Kin Jenkin Tsui,Chi-Ying Vanessa Li,Kwong-Yu Chan, Dennis Y.C. Leung, Sam M. Sit,Ching-Kit Ho,Ka Ming Leung,Changzhong Liao
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