One-Step Synthesis of Carbon Nanotubes-Modified and Carbon-Coated Li4Ti5O12 and Its Application to Li Half Cell and LiNi0.8Co0.1Mn0.1O2/Li4Ti5O12 Full Cell
| Autor: | Aolin Hou, Pengfei Zhang, Yameng Fan, Chai Fengtao, Yanxia Liu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Diffusion chemistry.chemical_element 02 engineering and technology Carbon nanotube 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences Cathode Electronic Optical and Magnetic Materials law.invention Anode chemistry.chemical_compound chemistry Chemical engineering law 0103 physical sciences Materials Chemistry Lithium Electrical and Electronic Engineering 0210 nano-technology Polarization (electrochemistry) Lithium titanate |
| Zdroj: | Journal of Electronic Materials. 49:2529-2538 |
| ISSN: | 1543-186X 0361-5235 |
| Popis: | Li4Ti5O12 (LTO) composites modified with carbon nanotubes (CNTs) and carbon coating (LTO@C/CNTs) were synthesized by a simple solid-state reaction. The carbon-coated layers reduce the growth of the primary particles, inhibit interface side reactions and increase electron conductivity, so CNTs-modified LTO can form a conductive network and improve the diffusion path of lithium ions. The LTO@C/CNTs composites show a high-rate capability (150 mAh g−1 at 10 C, 145 mAh g−1 at 20 C) with good cycling performance (90.1% and 82.8% capacity retentions after 1000 cycles at 10 C and 20 C, respectively). In addition, superior electrochemical performance is also demonstrated in a full cell with a LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode and LTO@C/CNTs anode (97.1% capacity retentions after 200 cycles at 1 C). The carbon coating and CNTs-modified in LTO can reduce the polarization of potential difference and charge-transfer resistance, improve the diffusion coefficient of lithium ions, and lead to high rate performance and cycle stability. |
| Databáze: | OpenAIRE |
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