State Key Laboratory of Chem/Bio-sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University , Changsha 410082, China.
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University , Guangdong Sheng 518060, China.
ACS Appl Mater Interfaces. 2017 Oct 25;9(42):36849-36856. doi: 10.1021/acsami.7b11599. Epub 2017 Oct 16.
Black phosphorus (BP) has recently aroused researchers' great interest as promising anode material for sodium-ion battery (SIB), owing to its high theoretical capacity (2596 mAh g) and good electric conductivity (about 300 S m). However, the large volume variation during electrochemical cycling makes it difficult to use for practical applications. Herein, the reversible performance of BP in SIB is significantly enhanced by bridging covalently functionalized BP on graphene. The enhanced interaction between the chemical functionalized BP and graphene improves the stability of BP during long-cycle running of SIB. The bridging reduces the surface energy and increases thickness of BP available for enlarging the channel between BP nanosheet and graphene. The enlarged channel stores more sodium ions for improving cycle performance. Significantly, two types of phosphorus-carbon bond are first detected during experimental analysis. Benefiting from the strategy, the BP-based SIB anode exhibits 1472 mAh g specific capacity at 0.1 A g in the 50th cycle and 650 mAh g at 1 A g after 200 cycles.
黑磷（BP）作为一种很有前途的钠离子电池（SIB）的阳极材料，由于其高理论容量（2596 mAh g）和良好的导电性（约 300 S m），最近引起了研究人员的极大兴趣。然而，在电化学循环过程中体积的剧烈变化使其难以实际应用。在此，通过在石墨烯上桥接共价功能化的 BP 显著提高了 BP 在 SIB 中的可逆性能。化学功能化的 BP 和石墨烯之间增强的相互作用提高了 BP 在 SIB 长循环运行期间的稳定性。桥接降低了表面能并增加了 BP 的厚度，从而扩大了 BP 纳米片和石墨烯之间的通道。扩大的通道可以存储更多的钠离子，从而提高循环性能。值得注意的是，在实验分析中首次检测到了两种类型的磷碳键。得益于该策略，基于 BP 的 SIB 阳极在第 50 次循环时在 0.1 A g 的电流密度下表现出 1472 mAh g 的比容量，在 200 次循环后在 1 A g 的电流密度下仍具有 650 mAh g 的比容量。
