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Improve the low-temperature electrochemical performance of Li4Ti5O12 anode materials by ion doping

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Abstract

We adopt the strategy of doping ions of Mg2+, Cr3+, and F− into Li4Ti5O12 (LTO) to substitute Li, Ti, and O, respectively (called the corresponding sample Mg-LTO, Cr-LTO, and F-LTO, respectively), and investigated its influences on the low-temperature electrochemical performance of LTO. After doping, the electrical conductivity of Mg-LTO, Cr-LTO, and F-LTO increased from less than < 10− 13 S cm− 1 to 3.07 × 10− 7 S cm− 1, 5.57 × 10− 7 S cm− 1, and 7.04 × 10− 7 S cm− 1, respectively. Structural refinement shows that doping has little effect on the radius of the crystal diffusion sites. Further research shows that the main reason for the improvement of low-temperature electrochemical performance is that doping affects the electrical conductivity, micromorphology, and phase composition of LTO. At −20 °C/10 C (1C corresponding to 175 mAh g− 1), the discharge capacities of Mg-LTO, Cr-LTO and, F-LTO are 113 mAh g− 1, 123 mAh g− 1, and 128 mAh g− 1, respectively. As a contrast, there is no discharge capacity for Pure LTO at the same conditions. After 600 cycles at −20 °C/5C, the discharge capacities of the sample of Pure LTO, Mg-LTO, Cr-LTO, and F-LTO are 69.7 mAh g− 1, 107.5 mAh g− 1, 142.3 mAh g− 1, and 133.2 mAh g− 1, respectively. Mg-LTO, Cr-LTO, and F-LTO exhibit excellent low-temperature rate performance and cycling stability. The related electrochemical factors and materials structure mechanisms involved were discussed in detail.

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Acknowledgements

This study was financially supported by Panxi Strategic Resources Innovation Development Fund of Sichuan Province (1840STC30696/01).

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  1. College of Materials Science and Engineering, Sichuan University, 610065, Chengdu, Sichuan, China

    Chunlin Li, Qian Huang & Jian Mao

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  1. Chunlin Li
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Correspondence to Jian Mao.

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Li, C., Huang, Q. & Mao, J. Improve the low-temperature electrochemical performance of Li4Ti5O12 anode materials by ion doping. J Mater Sci: Mater Electron 31, 21444–21454 (2020). https://doi.org/10.1007/s10854-020-04658-z

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