Co-Modification of commercial TiO2 anode by combining a solid electrolyte with pitch-derived carbon to boost cyclability and rate capabilities
| Autor: | Hui-Ling Zhu, Jing An, Yong-Xin Qi, Shu-Xian Kang, Yu-Jun Bai, Huan Yang, Meng Huang, Xue Bai, Ning Lun, Ling-Yun Kong |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
General Engineering chemistry.chemical_element Ionic bonding Bioengineering 02 engineering and technology General Chemistry Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Anode chemistry Chemical engineering Ionic conductivity General Materials Science Lithium 0210 nano-technology Current density Carbon |
| Zdroj: | Nanoscale Advances. 2:2531-2539 |
| ISSN: | 2516-0230 |
| DOI: | 10.1039/d0na00192a |
| Popis: | The bad electrochemical performance circumscribes the application of commercial TiO2 (c-TiO2) anodes in Li-ion batteries. Carbon coating could ameliorate the electronic conductivity of TiO2, but the ionic conductivity is still inferior. Herein, a co-modification method was proposed by combining the solid electrolyte of lithium magnesium silicate (LMS) with pitch-derived carbon to concurrently meliorate the electronic and ionic conductivities of c-TiO2. The homogeneous mixtures were heated at 750 °C, and the co-modified product with suitable amounts of LMS and carbon demonstrates cycling capacities of 256.8, 220.4, 195.9, 176.4, and 152.0 mA h g−1 with multiplying current density from 100 to 1600 mA g−1. Even after 1000 cycles at 500 mA g−1, the maintained reversible capacity was 244.8 mA h g−1. The superior rate performance and cyclability correlate closely with the uniform thin N-doped carbon layers on the surface of c-TiO2 particles to favor the electrical conduction, and with the ion channels in LMS as well as the cation exchangeability of LMS to facilitate the Li+ transfer between the electrolyte, carbon layers, and TiO2 particles. The marginal amount of fluoride in LMS also contributes to the excellent cycling stability of the co-modified c-TiO2. |
| Databáze: | OpenAIRE |
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