Citation: Liu Kun, Liu Yao, Zhu Haifeng, Dong Xiaoli, Wang Yonggang, Wang Congxiao, Xia Yongyao. NaTiSi₂O₆/C Composite as a Novel Anode Material for Lithium-Ion Batteries[J]. Acta Physico-Chimica Sinica, ;2020, 36(11): 191203. doi: 10.3866/PKU.WHXB201912030 shu

NaTiSi₂O₆/C Composite as a Novel Anode Material for Lithium-Ion Batteries

Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Fudan University, Shanghai 200433, P. R. China

Corresponding author: Wang Congxiao, cxwang@fudan.edu.cn Xia Yongyao, yyxia@fudan.edu.cn
Received Date: 10 December 2019
Revised Date: 7 January 2020
Accepted Date: 7 January 2020
Available Online: 13 January 2020
Fund Project: the National Natural Science Foundation of China 21875045The project was supported by the National Natural Science Foundation of China (21875045) and the National Key Research and Development Program of China (2016YFB0901500)the National Key Research and Development Program of China 2016YFB0901500

The development of human society and the continuously emerging environmental problems call for cleaner energy resources. Lithium-ion batteries, since their commercialization in the early 1990s, have been an important power source of mobile phones, laptops as well as other portable electronic devices. Their advantages include environment-friendliness, light weight, and no memory effect compared with lead-acid or nickel-cadmium batteries. Electrode materials play an important role in the performance of lithium-ion batteries. The traditional commercial anode material, graphite, has a theoretical specific capacity of 372 mAh·g^-1 and working potential close to 0 V (vs Li⁺/Li), making it prone to the formation of lithium dendrite, which may cause short circuit especially when large current is applied. Another commercial anode material Li₄Ti₅O₁₂, which also undergoes an intercalation reaction during lithiation process, has a theoretical specific capacity of 175 mAh·g^-1 along with three lithium-ion intercalations per formula unit. This is relatively small, and it has a relatively high working potential of 1.55 V (vs Li⁺/Li), which reduces its output voltage and specific energy when assembled in full battery. To overcome the shortcomings mentioned above, it is essential to search for new anode materials that are low-cost, environment-friendly, and easy to synthesize. Silicate materials have gained widespread attention owing to their low cost and facile synthesis. Herein, we report for the first time a novel titanosilicate, NaTiSi₂O₆, synthesized by sol-gel and solid sintering. It is isostructural to pyroxene jadeite NaAlSi₂O₆, belonging to monoclinic crystal system with a space group of C2/c. By in situ pyrolysis and carbonization of glucose, nanosized NaTiSi₂O₆ mixed with carbon was successfully obtained with a specific surface area of 132 m²·g^-1, calculated according to the Brunauer–Emmett–Teller formula. The specific charge/discharge capacity in the first cycle at current density of 0.1 A·g^-1 is 266.6 mAh·g^-1 and 542.9 mAh·g^-1, respectively, with an initial coulombic efficiency of 49.1%. After 100 cycles, it retains a specific charge capacity of 224.1 mAh·g^-1, corresponding to a capacity retention rate of 84.1%. The average working potential of NaTiSi₂O₆ is 1.2–1.3 V (vs Li⁺/Li), slightly lower than that of Li₄Ti₅O₁₂. The reaction mechanism while charging and discharging was determined by in situ X-ray diffraction test as well as selected area electron diffraction. The results showed that NaTiSi₂O₆ undergoes an intercalation reaction during lithiation process, with two lithium-ion intercalations per formula unit. This makes NaTiSi₂O₆ a new member of the silicate anode material family, and may provide insights into the development of new silicate electrode materials in the future.
- NaTiSi₂O₆,
- Lithium-ion battery,
- Anode material,
- Silicate electrode material
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NaTiSi₂O₆/C Composite as a Novel Anode Material for Lithium-Ion Batteries