Gao Xiaoliang, Zheng Yihe, Chang Jin, Xu Hai, Hui Zengyu, Dai Henghan, Wang Huifang, Xia Zhongming, Zhou Jinyuan, Sun Gengzhi
Institute of Advanced Materials, Nanjing Tech University, Nanjing 211816, China.
School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China.
ACS Appl Mater Interfaces. 2022 Apr 6;14(13):15298-15306. doi: 10.1021/acsami.2c01382. Epub 2022 Mar 25.
Prussian blue analogues (PBAs) are believed to be intriguing anode materials for Li storage because of their tunable composition, designable topologies, and tailorable porous structures, yet they suffer from severe capacity decay and inferior cycling stability due to the volume variation upon lithiation and high electrical resistance. Herein, we develop a universal strategy for synthesizing small PBA nanoparticles hosted on two-dimensional (2D) MXene or rGO (PBA/MX or PBA/rGO) an transformation from ultrathin layered double hydroxides (LDH) nanosheets. 2D conductive nanosheets allow for fast electron transport and guarantee the full utilization of PBA even at high rates; at the meantime, PBA nanoparticles effectively prevent 2D materials from restacking and facilitate rapid ion diffusion. The optimized NiMn-PBA/MX as an anode for lithium-ion batteries (LIBs) delivers a capacity of 442 mAh g at 0.1 A g and an excellent cycling robustness in comparison with bare PBA bulk crystals. We believe that this study offers an alternative choice for rationally designing PBA-based electrode materials for energy storage.
普鲁士蓝类似物（PBAs）因其可调节的组成、可设计的拓扑结构和可定制的多孔结构，被认为是用于锂存储的极具吸引力的负极材料。然而，由于锂化过程中的体积变化和高电阻，它们存在严重的容量衰减和较差的循环稳定性。在此，我们开发了一种通用策略，通过超薄层状双氢氧化物（LDH）纳米片的转变来合成负载在二维（2D）MXene或rGO上的小尺寸PBA纳米颗粒（PBA/MX或PBA/rGO）。二维导电纳米片允许快速电子传输，并确保即使在高倍率下也能充分利用PBA；与此同时，PBA纳米颗粒有效地防止二维材料重新堆叠，并促进快速离子扩散。优化后的NiMn-PBA/MX作为锂离子电池（LIBs）的负极，在0.1 A g的电流密度下提供442 mAh g的容量，与裸露的PBA块状晶体相比，具有出色的循环稳定性。我们相信，这项研究为合理设计用于能量存储的基于PBA的电极材料提供了另一种选择。
