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하손,현종찬,정예빈,최연화,윤영수 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
In this study, we propose a hierarchically nanoporous 3D assembly (HNA) composed of functionalized onion-like graphitic carbon building blocks, several nanometers in diameter, as a catalytic scaffold for Li-metal storage. The HNA-based electrodes can lead to a high Li ion concentration in the nanoporous structure by ion-exchange mechanism, showing a high CE of ~99.1%, high rate capability of 12 mA cm<sup>-2</sup>, and a stable cycling behavior of more than 750 cycles. In addition, anode minimized LMBs were achieved using the HNA that has limited Li content (~0.13 mg cm<sup>-2</sup>), corresponding to 6.5% of the cathode material (commercial NCM622 (~2 mg cm<sup>-2</sup>)). The LMBs demonstrated a feasible electrochemical performance with high energy and power densities of ~510 W h kg electrode<sup>-1</sup> and ~2760 W kg electrode<sup>-1</sup>, respectively, for more than 100 cycles.
Effects of Pseudocapacitive Nanocarbon Electrodes for Lithium Metal Anode
박지민,하손,윤영수 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Lithium metal anode (LMA) has attracted much attention as one of the most attractive anode candidates for next-generation high-energy-density batteries because of high theoretical capacity (3860 mAh g<SUP>-1</SUP>) and low redox potential (-3.04 V vs. SHE) of lithium. However, LMA has the intrinsic issue, continuous solid electrolyte interphase (SEI) formation induced by electrolyte decomposition. Inhomogeneous SEI layers can induce heterogeneous lithium ion diffusion, leading to dendrite formation. In addition, SEI layer is prone to be cracked and reformed with lithium metal deposition/dissolution cycles, which causes critical decays of Coulombic efficiencies and cycling performances. In this study, a heteroatom-rich carbon materials were used as a lithiophilic LMA to guide homogeneous lithium metal growth. In addition, effects of the lithiophilic LMA on the electrochemical performances of lithium metal batteries were studied through several electrochemical analysis methods.
현종찬,하손,강동혁,이은지,윤영수 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
In this study, waste pinecone-derived hierarchically porous pyropolymers (WP-HPPs) were fabricated from natural polymer precursors through simple heating process, and their specific surface areas and pore structures were tuned through a chemical activation process. The unique materials properties of WP-HPPs possessing high effective surface areas and hierarchically open nanopores led to high specific capacities of ~412 mAh g<sup>-1</sup> and considerable rate/cycling performances as a cathode for lithium ion batteries. In addition, when the WP-HPPs based cathode was assembled with a pseudocapacitive pyropolymer counterpart, the pseudocapacitive electrode pair exhibited high specific energy of ~340 Wh kg<sup>-1</sup> and a high specific power of ~11,000 W kg<sup>-1</sup> with long cycling stability over 2000 galvanostatic charge/discharge cycles. These results provide us an insight that natural polymers can be a useful electrode material through exquisite pyrolysis and activation process.
강동혁,현종찬,하손,박지민,윤영수 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Research interest in aqueous rechargeable batteries (ARBs) has increased in recent years, because ARBs have many advantages such as high kinetic performances, environmental benignity, and nonflammable aqueous electrolytes. Among of ARBs, one of the most promising candidates is aqueous zinc batteries (AZBs) owing to high theoretical capacity, low redox potential, and excellent chemical stability. However, the AZBs suffers from poor electrochemical performances of zinc metal anode (ZMA) such as low CE originating from side reactions and dendritic metal growth during cycling process. Although mildly acidic aqueous electrolytes are partly effective for the issues, the ZMA still suffers from the poor electrochemical performances. In this study, we propose a surface-modified carbon-based electrode material to guide a selective zinc metal deposition with no side reaction. Hence, high-performance AZBs were achieved by introducing the surface-modified carbon-based electrode materials for ZMA.