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<p>Lithium titanate (Li<sub>2</sub>Ti<sub>3</sub>O<sub>7</sub>) exhibits high ionic conductivity, but it faces commercialization challenges due to its high synthesis temperature (&gt; 1100 ℃) and high cost. Sodium titanate (Na<sub>2</sub>Ti<sub>3</sub>O<sub>7</sub>) has been explored as a stable anode material for aqueous sodium-ion batteries (SIBs) and is considered a potential alternative to Li<sub>2</sub>Ti<sub>3</sub>O<sub>7</sub>. However, its wide bandgap energy (3.7&#xa0;eV) limits both electronic conductivity and practical applications. In this study, LiNaTi<sub>3</sub>O<sub>7</sub> was synthesized through a mechano-chemical method using Li<sub>2</sub>CO<sub>3</sub>, Na<sub>2</sub>CO<sub>3</sub>, and TiO<sub>2</sub> as precursors. The material was calcined at various temperatures (700–900 ℃) for 12&#xa0;h to optimize crystallinity and electrochemical performance. The phase purity and crystallinity were verified via X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. Notably, the sample calcined at 800 ℃ for 12&#xa0;h showed the sharpest diffraction peaks and minimal particle agglomeration. The electrochemical tests of LNTO-800–12 revealed a stable voltage plateau at 1.3&#xa0;V, an initial discharge capacity of 141.7 mAh/g, and capacity retention of 93.6% after 120 cycles at 50&#xa0;mA/g. The cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) tests demonstrated excellent reversibility and low charge transfer resistance (167 Ω). These findings demonstrate that LiNaTi<sub>3</sub>O<sub>7</sub> is a promising high-performance, cost-effective anode material for LIBs.</p>

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Research on the synthesis and electrochemical properties of LiNaTi3O7 as a lithium-ion battery anode material

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Yucai Zhang,
  • Jiaxuan Xi,
  • Xiaomin Wang,
  • Peilong Ji,
  • Renpan Deng

摘要

Lithium titanate (Li2Ti3O7) exhibits high ionic conductivity, but it faces commercialization challenges due to its high synthesis temperature (> 1100 ℃) and high cost. Sodium titanate (Na2Ti3O7) has been explored as a stable anode material for aqueous sodium-ion batteries (SIBs) and is considered a potential alternative to Li2Ti3O7. However, its wide bandgap energy (3.7 eV) limits both electronic conductivity and practical applications. In this study, LiNaTi3O7 was synthesized through a mechano-chemical method using Li2CO3, Na2CO3, and TiO2 as precursors. The material was calcined at various temperatures (700–900 ℃) for 12 h to optimize crystallinity and electrochemical performance. The phase purity and crystallinity were verified via X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. Notably, the sample calcined at 800 ℃ for 12 h showed the sharpest diffraction peaks and minimal particle agglomeration. The electrochemical tests of LNTO-800–12 revealed a stable voltage plateau at 1.3 V, an initial discharge capacity of 141.7 mAh/g, and capacity retention of 93.6% after 120 cycles at 50 mA/g. The cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) tests demonstrated excellent reversibility and low charge transfer resistance (167 Ω). These findings demonstrate that LiNaTi3O7 is a promising high-performance, cost-effective anode material for LIBs.