A high-performance Te@CMK-3 composite negative electrode for Na rechargeable batteries
We report a new class of high-capacity chalcogen–carbon composite negative electrodes for Na rechargeable batteries, consisting of tellurium-infiltrated ordered mesoporous carbon CMK-3. Its unparalleled electric conductivity makes Te a promising electrode material with high-capacity utilization. The rechargeable cell Na/Te@CMK-3, using a carbonate-based electrolyte, exhibited a large stable capacity of ~ 320 mA h (g-Te)−1 at 0.2 C with an excellent rate capability (55% of the theoretical specific capacity at 2 C-rate), and long-term cyclability (> 500 cycles), as well as 100% coulombic efficiency. Our study evidences the great potential of mesoporous carbon-encapsulated Te materials concepts as a new class of high-performance chalcogen-based electrode materials for Na rechargeable batteries.
KeywordsTellurium Chalcogen CMK-3 mesoporous carbon Na-ion battery negative electrode
We thank Benjamin Paul for help with SEM. Partial financial support from the Federal Ministry of Education and Research through funding within the “Sino German TU9 network for electromobility” under the grant reference number 16N11929 is gratefully acknowledged.
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