Tian Xue, Zhang Peng, Liao Yizhi, Soomro Razium A, Xu Bin
State Key Laboratory of Organic-Inorganic Composites, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing, 100029, China.
Small Methods. 2023 Aug;7(8):e2201525. doi: 10.1002/smtd.202201525. Epub 2023 Feb 24.
Antimony-based anode materials are recognized for their high potassium storage capacities and appropriate operating potentials. However, the large volume expansion of Sb during the potassiation/depotassiation process, which results in a quick capacity decay, severely limits its practical application in potassium-ion batteries (PIBs). Here, a carbon-coated Sb/MXene heterostructure composite (CSM) is synthesized by adsorption of Sb on MXene nanosheets via Sb-O-Ti bonds followed by carbothermic reduction to construct dual-confined MXene@carbon conductive framework capable of withstanding high volume expansion of Sb and conducive to enabling accelerated electron transfer kinetics. The CSM composite, particularly CSM-700, when configured as an anode for PIBs, realized high capacity (484.4 mAh g at 0.1 A g ), an ultra-stable cycling performance with a high reversible capacity of 435.9 mAh g at 0.1 A g after 100 cycles corresponding to a capacity retention rate of 90.0%, and superior rate performance of 323.0 mAh g at 1 A g . The proposed strategy offers a simple route to construct high-performance Sb-based anodes for advanced PIBs.
锑基负极材料因其高钾存储容量和合适的工作电位而受到认可。然而，在钾化/脱钾过程中Sb会发生大量体积膨胀，导致容量迅速衰减，这严重限制了其在钾离子电池（PIB）中的实际应用。在此，通过Sb-O-Ti键将Sb吸附在MXene纳米片上，然后进行碳热还原，合成了一种碳包覆的Sb/MXene异质结构复合材料（CSM），以构建能够承受Sb的高体积膨胀并有利于加速电子转移动力学的双限域MXene@碳导电框架。CSM复合材料，特别是CSM-700，当用作PIB的负极时，实现了高容量（在0.1 A g时为484.4 mAh g）、超稳定的循环性能，在0.1 A g下经过100次循环后具有435.9 mAh g的高可逆容量，对应容量保持率为90.0%，以及在1 A g下323.0 mAh g的优异倍率性能。所提出的策略为构建用于先进PIB的高性能Sb基负极提供了一条简单途径。
