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模板法制备纳米锂硫电池材料
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采用模板法制备了100nm的锂硫电池电极材料，提供了一种新思路，分享下~ 摘要： Herein, a novel technique, i.e., a hard template and scalable method, is proposed to engineer nanoLi2S composites with core–shell structures as cathodes of Li–S batteries. The size of the as-prepared nanostructured Li2S is around 100 nm. With the assistance of FETEM, HRTEM and EFTEM elemental mapping, an excellent core–shell structure has been confirmed and the outside carbon shell has a thickness of 20–50 nm, effectively retarding polysulfide outflow and dissolution. A high initial capacity of 915 mA h g−1 at 0.2 C has been achieved upon electrochemical cycling and the battery still has exceptional capacity retention after prolonged 200 cycles with a limited decay of 0.18% per cycle. Also, at 0.5 C the electrode exhibits 60% capacity retention with a long life of 300 cycles. We attribute these good performances to the nano-architecture constructed by the novel and facile method. |
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2016-02-26 12:08:10, 4.77 M
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