Journal
CHEMICAL ENGINEERING JOURNAL
Volume 389, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124370
Keywords
Cobalt phosphide; Self-supporting; Aluminum-ion battery; Porous structure; High loading
Categories
Funding
- National Natural Science Foundation of China [51874020]
- Fundamental Research Funds for the Central Universities [FRF-IP-19-001]
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Metallic cathode materials for Al-ion batteries (AIBs) are attracting more and more attention due to high intrinsic capacity. However, powdery metal-based active materials loaded on a current collector by binders are often designed. Low loading mass, small practical capacity and poor cycling stability limit the advancement of high-energy Al-ion batteries. Here, a novel self-supporting hierarchically porous cobalt phosphide (Co-P) on 3D carbon cloth (CC) as cathode for AIBs was designed and constructed by Co-P electrodeposition on gas-liquid-solid interface and heating treatment. The self-supporting hierarchically porous Co-P/CC cathode exhibits high initial discharge capacity of 257.9 mAh g(-1) and maintains 85.1 mAh g(-1) with a high Coulombic efficiency of 99.6% after 400 cycles at 200 mA g(-1). The value is much higher than that of powdery Co2P/Ta cathode (43.7 mAh g(-1) with Coulombic efficiency less than 90%). More importantly, the loading mass of self-supporting Co-P is up to 12.6 mg cm(-2) and delivers extremely high areal capacity of 1072 mAh cm(-2), which is more than 10 times compared with those of powdery active materials. This work provides effective metal-based cathode to develop advanced high-energy-density Al-ion battery.
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