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xmq135828

铁杆木虫 (著名写手)

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[交流] AFM上最新的锂电负极，Ti3+ Self-Doped Dark Rutile TiO2 Ultrafine Nanorods 已有1人参与

贴上摘要：
Dark-colored rutile TiO2 nanorods doped by electroconducting Ti3+ have been obtained uniformly with an average diameter of ≈7 nm, and have been first utilized as anodes in lithium-ion batteries. They deliver a high reversible specific capacity of 185.7 mAh g−1 at 0.2 C (33.6 mA g−1) and maintain 92.1 mAh g−1 after 1000 cycles at an extremely high rate 50 C with an outstanding retention of 98.4%. Notably, the coulombic efficiency of Ti3+–TiO2 has been improved by approximately 10% compared with that of pristine rutile TiO2, which can be mainly attributed to its prompt electron transfer because of the introduction of Ti3+. Again the synergetic merits are noticed when the promoted electronic conductivity is combined with a shortened Li+ diffusion length resulting from the ultrafine nanorod structure, giving rise to the remarkable rate capabilities and extraordinary cycling stabilities for applications in fast and durable charge/discharge batteries. It is of great significance to incorporate Ti3+ into rutile TiO2 to exhibit particular electrochemical characteristics triggering an effective way to improve the energy storage properties.
感觉近来锂电材料方面做掺杂改善结构的文章比包覆要更多一些，似乎大家意识到改善材料本身晶体结构（电子结构等）才能更有效地改善材料的性能

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