Li2ZnTi3O8/C anode with high initial Coulombic efficiency, long cyclic life and outstanding rate properties enabled by fulvic acid
| Autor: | Hui-Ling Zhu, Yong-Xin Qi, Yu-Jun Bai, Ning Lun, Jia-Li Qin |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Carbonization Diffusion chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Anode Membrane chemistry Chemical engineering Particle General Materials Science 0210 nano-technology Carbon Faraday efficiency |
| Zdroj: | Carbon. 163:297-307 |
| ISSN: | 0008-6223 |
| DOI: | 10.1016/j.carbon.2020.03.029 |
| Popis: | Industrialized anode materials for Li-ion batteries (LIBs) require high initial Coulombic efficiency (ICE), long cyclic life and outstanding rate properties. Herein, fulvic acid (FA) with the elements of C, H, O, N and S was adopted as the carbon precursor to mix with Li2ZnTi3O8 (LZTO) followed by carbonizing to optimize the electrochemical performance of the LZTO anode. At a weight ratio of 0.28 for FA/LZTO, the product carbonized at 800 °C reveals high ICE of 88.0%, remarkable rate capabilities (lithiation/delithiation capacities of 195.4/191 and 143.5/143.5 mAh g−1 at 0.1 and 1.6 A g−1, respectively). After undergoing 1000 cycles at 0.5 A g−1, the retained reversible capacity is 215.3 mAh g−1. The excellent performance suitable for industrial power LIBs associates with the N and S co-doped discontinuous carbon coating layers, small carbon bumps and membranes on the LZTO particle surface. The carbon material facilitates electron transfer and the exposed LZTO surface maintains the good Li-ion migration of LZTO. Particularly, the NO3− radicals yielded favor to boost the Li-ion diffusion by transforming into the solid state electrolytes of Li3N and LiNxOy in the lithiation process. |
| Databáze: | OpenAIRE |
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