Zn5(OH)6(CO3)2-assisted controlled fabrication of microcrystalline cellulose-derived hierarchical porous carbon for high-performance lithium storage
Source abstract
Abstract
The proper N doping engineering and microstructure design are of essential importance to develop advanced carbon anodes for Li-ion batteries. Herein, a facile strategy was developed to fabricate hierarchical porous carbon with controllable pore structures, N doping content and configurations, which was easily realized via introducing zinc salt as recyclable activator and regulator in the precursors. The zinc salt could not only function as pore-forming agent to facilitate the formation of hierarchical porous defect-rich structure, but also act as N-confined reactor to preserve the N-containing intermediates and promote N doping in the carbon matrix during thermal conversion. Specifically, 21.7% N content (increased by 115%) which was mainly composed of pyridinic/pyrrolic N (88.6%) was achieved with the addition of Zn 5(OH) 6(CO 3) 2. Meanwhile, desirable mesopore-dominant hierarchical porous carbon with appropriate specific surface area was obtained. Benefiting from the unique microstructure and N functionalities, the NC-Zn 5(OH) 6(CO 3) 2 anode delivered a high reversible capacity of 564 mAh g −1 at 200 mA g −1 over 100 cycles, which was almost two times higher than those for NC, and remarkable long-term cycling stability with high coulombic efficiency around 100% after 1300 cycles at 1000 mA g −1. This work provides an intriguing and feasible avenue for the reasonable structure design of carbon material with superior electrochemical performance for sustainable energy storage.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advancements in Battery Materials · Supercapacitor Materials and Fabrication · Advanced Battery Materials and Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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