Red Phosphorus Single-Walled Carbon Nanotube Composite as a Superior Anode for Sodium Ion Batteries
Red Phosphorus Single-Walled Carbon Nanotube Composite as a Superior Anode for Sodium Ion Batteries
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DOI：
10.1021/acsnano.5b00376
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发表时间：
2015-03-01
期刊：
影响因子：
17.1
通讯作者：
Wang, Chunsheng
中科院分区：
文献类型：
--
作者：
Zhu, Yujie;Wen, Yang;Wang, Chunsheng
钠离子电池（SIB）已被认为是锂离子电池的首选替代品，因为与锂相比，钠的地球丰度和低成本。在所有提议的SIB阳极材料中，赤磷（P）是非常有前途的候选者，因为它具有最高的理论容量（类似于2600 mAh/g）。在这项研究中，红色P-单壁碳纳米管（表示为红色P-SWCNT）复合材料，其中红色P均匀分布在缠结的单壁碳纳米管束之间，通过改进的蒸发-冷凝法制备。得益于非破坏性制备过程，高导电性和机械强度的SWCNT网络得以保留，这增强了复合材料的导电性并稳定了固体电解质界面。结果，红色P-SWCNT复合材料呈现出高的总钠存储容量（类似于在50 mA/g（复合材料）下的700 mAh/g（复合材料））、快速率容量（类似于在2000 mA/g（复合材料）下的300 mAh/g（复合材料））和稳定的长期循环性能，在2000次钠化-去钠化循环后具有80%的容量保持率。通过蒸发冷凝法制备的红色P-SWCNT复合材料显著地将P/碳复合材料的循环稳定性从电流近似100次循环延长到近似2000次循环。
Sodium ion batteries (SIBs) have been,considered as a top alternative to lithium ion batteries due to the earth abundance and low cost of sodium compared With lithium. Among all proposed anode materials for SIBs, red phosphorus (P) is a very promising candidate because it:has the highest theoretical capacity (similar to 2600 mAh/g). In this study, a red P-single-walled carbon nanotube (denoted as red P-SWCNT) composite, in which red P is uniformly distributed between tangled SWCNTs bundles, is fabricated by a modified vaporization-condensation method. Benefiting from the nondestructive preparation process, the highly conductive and mechanically strong SWCNT network is preserved, which enhances the conductivity of the composite and stabilizes the solid electrolyte interphase. As a result, the red P-SWCNT composite presents a-high overall sodium storage capacity (similar to 700 mAh/g(composite) at 50 mA/g(composite)), fast rate capability (similar to 300 mAh/g(composite) at 2000 mA/g(composite)), and stable long-term cycling performance with 80% capacity retention after 2000 sodiation-desodiation cycles. The red P-SWCNT composite fabricated by the vaporization condensation method significantly extends the cycling stability of P/carbon composite from current similar to 100 cycles to similar to 2000 cycles.