Synergy of Black Phosphorus-Graphite-Polyaniline-Based Ternary Composites for Stable High Reversible Capacity Na-Ion Battery Anodes.
Synergy of Black Phosphorus-Graphite-Polyaniline-Based Ternary Composites for Stable High Reversible Capacity Na-Ion Battery Anodes.
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DOI：
10.1021/acsami.9b04088
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发表时间：
2019-04
影响因子：
9.5
通讯作者：
Hongchang Jin;Taiming Zhang;Chenghao Chuang;Ying-Rui Lu;T. Chan;Zhenzhen Du;Hengxing Ji;L. Wan
中科院分区：
文献类型：
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作者：
Hongchang Jin;Taiming Zhang;Chenghao Chuang;Ying-Rui Lu;T. Chan;Zhenzhen Du;Hengxing Ji;L. Wan
近年来，少层黑磷（BP）由于其特殊的二维结构、良好的电子导电性和高的理论容量而作为一种有前途的钠离子电池负极材料引起了人们的极大关注。基于BP的材料的主要缺点是基于BP的复合材料的实际比容量比预期的低，这是由于低的P原子利用率和由于在钠化/去钠化循环期间发生的大体积膨胀而导致的结构断裂。在这项工作中，我们报告了一个三元复合材料，包括BP，石墨，聚苯胺（BP-G/PANI）与BP的质量含量为65wt%。三元复合物提供了优化的离子路径（电解质→ PANI → BP-G → BP），这降低了电极的电荷转移电阻。此外，进一步的非原位X射线吸收光谱测量表明，BP-G复合材料中石墨的存在允许BP的深度钠化，并且还导致更高的钠化/去钠化可逆性。此外，均匀包覆的聚苯胺还抑制了BP电极在充放电过程中的体积膨胀，保证了BP-G/PANI的稳定循环性能。因此，我们的复合材料显示出1530 mAh gcompo的高可逆重量容量。1，0.25 A g-1，容量保持率为520 mAh gcompo.- 1在4 A g-1的高电流密度下1000次循环后，
In recent times, few-layer black phosphorus (BP) has attracted tremendous attention as a promising anode material for sodium-ion batteries due to its particular two-dimensional structure, good electron conductivity, and high theoretical capacity. The main disadvantages of BP-based materials are the lower practical specific capacity of the BP-based composite than expectation because of the low P atom utilization and the structural fracture due to the large volume expansion that occurs during sodiation/desodiation cycles. In this work, we report a ternary composite comprising BP, graphite, and polyaniline (BP-G/PANI) with a BP mass content of ∼65 wt %. The ternary composite provides an optimized ion pathway (electrolyte → PANI → BP-G → BP), which reduces the charge transfer resistance of the electrode. Also, further ex situ X-ray absorption spectroscopy measurements demonstrate that the presence of graphite in the BP-G composite allows a deep sodiation of BP and also leads to a higher sodiation/desodiation reversibility. In addition, the uniformly coated PANI also restricts the huge volume expansion of the BP electrode through discharge/charge processes, which promise the stable cycling performance of BP-G/PANI. Thus, our composite shows a high reversible gravimetric capacity of 1530 mAh gcompo.-1 at 0.25 A g-1 and a capacity retention of 520 mAh gcompo.-1 after 1000 cycles at a high current density of 4 A g-1.