Centre of Polymer Systems, Tomas Bata University in Zlin, Tr. T. Bati 5678, 760 01 Zlin, Czech Republic.
Int J Mol Sci. 2022 Jan 27;23(3):1457. doi: 10.3390/ijms23031457.
The electrochemical parameters of a novel binder-free self-standing biomimetic cathode based on lithium manganese oxide (LMO) and carbon nanotubes (CNT) for rechargeable Lithium-ion aqueous batteries (ReLIAB) are improved using polyaniline (PANI) core-shell in situ polymerization and graphene (Gr). The fabricated cathode material exhibits the so-called "tectonic plate island bridge" biomimetic structure. This constitution is created by combining three components as shown by a SEM and a TEM analysis: the Gr substrates support an entangled matrix of conductive CNT which connect island of non-conductive inorganic material composed of LMO. The typical spinel structure of the LMO remains unchanged after modifying the basic structure with Gr and PANI due to a simplified hydrothermal method used for synthesis. The Gr and PANI core-shell coating improves the electric conductivity from 0.0025 S/cm up to 1 S/cm. The electrochemical performances of the LMO/CNT-Gr/PANI composite electrode are optimized up to 136 mA h g compared to 111 mA h g of the LMO/CNT. Besides that, the new electrode shows good cycling stability after 200 galvanostatic charging/discharging cycles, making this structure a future candidate for cathode materials for ReLIAB.
采用聚苯胺（PANI）核壳原位聚合和石墨烯（Gr）对基于锂锰氧化物（LMO）和碳纳米管（CNT）的新型无粘结剂自支撑仿生阴极的电化学参数进行了改进，用于可充电锂离子水电解质电池（ReLIAB）。所制备的阴极材料呈现出所谓的“构造板块岛桥”仿生结构。SEM 和 TEM 分析表明，这种结构是通过结合三种成分形成的：Gr 基底支撑着由导电 CNT 组成的缠结基质，这些 CNT 连接由 LMO 组成的非导电无机材料的岛。Gr 和 PANI 对基本结构的修饰由于使用了简化的水热合成方法，保持了 LMO 的典型尖晶石结构不变。Gr 和 PANI 核壳涂层将电导率从 0.0025 S/cm 提高到 1 S/cm。与 LMO/CNT 的 111 mA h g 相比，LMO/CNT-Gr/PANI 复合电极的电化学性能优化高达 136 mA h g。此外，新电极在 200 次恒电流充放电循环后显示出良好的循环稳定性，因此这种结构是 ReLIAB 用阴极材料的未来候选材料。
