Citation: Yue Yang, Jiawei Zhu, Pengyan Wang, Haimi Liu, Weihao Zeng, Lei Chen, Zhixiang Chen, Shichun Mu. NH₂-MIL-125 (Ti) Derived Flower-Like Fine TiO₂ Nanoparticles Implanted in N-doped Porous Carbon as an Anode with High Activity and Long Cycle Life for Lithium-Ion Batteries[J]. Acta Physico-Chimica Sinica, ;2022, 38(6): 210600. doi: 10.3866/PKU.WHXB202106002 shu

NH₂-MIL-125 (Ti) Derived Flower-Like Fine TiO₂ Nanoparticles Implanted in N-doped Porous Carbon as an Anode with High Activity and Long Cycle Life for Lithium-Ion Batteries

Yue Yang ^{1, 2} ,
Jiawei Zhu ¹ ,
Pengyan Wang ¹ ,
Haimi Liu ¹ ,
Weihao Zeng ¹ ,
Lei Chen ¹ ,
Zhixiang Chen ¹ ,
Shichun Mu ^{1, 2,,}

1.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
2.
Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu Hydrogen Valley, Foshan 528200, Guangdong Province, China

Corresponding author: Shichun Mu, msc@whut.edu.cn
Received Date: 2 June 2021
Revised Date: 6 August 2021
Accepted Date: 9 August 2021
Available Online: 19 August 2021
Fund Project: the National Key Research and Development Program of China 2016YFA0202603the National Natural Science Foundation of China 22075223

Owing to their advantages such as safe operation, high power density, long cycle life, and low self-discharge rate, lithium-ion batteries (LIBs) have attracted attention for applications ranging from portable electronics to electric vehicles (EVs)/hybrid EVs (HEVs). However, the striking exothermic reaction and growth of lithium dendrites during lithiation-delithiation cycles for commercial graphite anodes are hidden safety risks associated with LIBs. Titanium dioxide (TiO₂) is considered as an important material for LIBs because of its high safety and excellent cycling stability. In addition, TiO₂ anode used in lithium-ion storage system has a relatively high voltage (~1.5 V vs. Li/Li⁺), and thus, it meets the strict safety standards of commercial LIBs. However, the unsatisfactory conductivity and ion diffusion rate prevent the further application of TiO₂ in LIBs. To date, the combination of graphene, carbon nanotubes (CNTs), carbon quantum dots (QDs) and porous carbon with TiO₂ has attracted significant research attention. Nevertheless, it is still challenging to introduce a unique nanostructure design by organically compounding TiO₂ with N-doped porous carbon matrix. Herein, N-doped porous carbon incorporating fine TiO₂ nanoparticles (NPs) with a flower-like structure (denoted as FL-TiO₂/NPC) is successfully prepared using flower-like NH₂-MIL-125(Ti) as the hard template. The as-prepared Ti-based framework shows a flower-like structure, which is assembled with two-dimensional (2D) corrugated porous nanosheets. On the one hand, the corrugated carbon nanosheets incorporating fine TiO₂ particles can offer a magnifying contact area between electrode matrix and electrolyte. On the other hand, the N-doped porous carbon plays a crucial role in improving the conductivity and structural integrity of the whole matrix. Therefore, the as-prepared FL-TiO₂/NPC can deliver an excellent reversible lithium storage capacity of 384.2 mAh·g^-1 at the current density of 0.5 A·g^-1 after 300 cycles and 279.1 mAh·g^-1 at 1 A·g^-1 after 500 cycles. Furthermore, even when tested at 2 A·g^-1, FL-TiO₂/NPC can deliver a reversible capacity of 256.5 mAh·g^-1 with a coulombic efficiency of 100% after 2000 cycles. The superior electrochemical performance and the structural toughness of LIBs originate from the unique flower-like structure. We believe that the proposed synthesis strategy will provide a new idea for the preparation of metal oxides/N-doped porous carbon composites with high lithium storage performance.
- TiO₂ nanoparticles,
- N-doped porous carbon nanosheet,
- Flower-like structure,
- NH₂-MIL-125 (Ti),
- Anode,
- Lithium-ion battery
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NH2-MIL-125 (Ti) Derived Flower-Like Fine TiO2 Nanoparticles Implanted in N-doped Porous Carbon as an Anode with High Activity and Long Cycle Life for Lithium-Ion Batteries

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NH₂-MIL-125 (Ti) Derived Flower-Like Fine TiO₂ Nanoparticles Implanted in N-doped Porous Carbon as an Anode with High Activity and Long Cycle Life for Lithium-Ion Batteries