期刊
SMALL
卷 18, 期 16, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202106403
关键词
aqueous batteries; electrodeposition; mixed metal sulfides; polymer electrodes; reduced graphene oxides
类别
资金
- European Union's Horizon 2020 research and innovation programme under GrapheneCore3 - Graphene Flagship [881603]
- Swedish Research Council [Janus 2017-04456]
- VINNOVA [GO-FOR-WATER 2019-05353]
- Swedish Innovation Agency
- Spanish Ministry of Science, Innovation, and Universities (MCI) through the SUSBAT project [RTI2018-101049-B-I00]
- Juan de la Cierva-formation fellowship (MCI-AEI/FEDER, UE) [FJC2018-037781-I]
- Consiglio Nazionale delle Ricerche within the CRUI-CARE agreement
This study demonstrates a two-step approach combining electrophoretic deposition and cathodic electrodeposition to fabricate multilayer hierarchical electrodes. The assembled battery shows high energy density, high power density, and excellent cycling stability.
Energy-storage materials can be assembled directly on the electrodes of a battery using electrochemical methods, this allowing sequential deposition, high structural control, and low cost. Here, a two-step approach combining electrophoretic deposition (EPD) and cathodic electrodeposition (CED) is demonstrated to fabricate multilayer hierarchical electrodes of reduced graphene oxide (rGO) and mixed transition metal sulfides (NiCoMnSx). The process is performed directly on conductive electrodes applying a small electric bias to electro-deposit rGO and NiCoMnSx in alternated cycles, yielding an ideal porous network and a continuous path for transport of ions and electrons. A fully rechargeable alkaline battery (RAB) assembled with such electrodes gives maximum energy density of 97.2 Wh kg(-1) and maximum power density of 3.1 kW kg(-1), calculated on the total mass of active materials, and outstanding cycling stability (retention 72% after 7000 charge/discharge cycles at 10 A g(-1)). When the total electrode mass of the cell is considered, the authors achieve an unprecedented gravimetric energy density of 68.5 Wh kg(-1), sevenfold higher than that of typical commercial supercapacitors, higher than that of Ni/Cd or lead-acid Batteries and similar to Ni-MH Batteries. The approach can be used to assemble multilayer composite structures on arbitrary electrode shapes.
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