한양대학교 · Engineering
강연엽 교수 연구실은 리튬-황 배터리, 나트륨 이온 배터리, 칼륨 이온 배터리 등 차세대 이차전지의 핵심 소재와 기기 설계를 중심으로 연구를 진행하고 있습니다. 특히 다공성 탄소, 나노복합재, 계면공학적 구조 설계를 통해 이온 확산 저항을 줄이고, 다이아몬드형 다이아몬드 전극의 안정성과 반응 동력을 향상시키는 데 초점을 맞추고 있습니다. 고용량, 고속 충·방전, 우수한 사이클 수명을 동시에 확보하는 혁신적 전극 및 전지 구성 요소의 개발이 핵심 연구 목표입니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
A novel nanocomposite cathode consisting of sulfur and hollow‐mesoporous titania (HMT) embedded within carbon nanotubes (CNT), which is designated as S‐HMT@CNT, has been obtained by encapsulating elemental sulfur into the pores of hollow‐mesoporous, spherical TiO 2 particles that are connected via CNT. A carbon‐paper interlayer, referred to as dual functional porous carbon wall (DF‐PCW), has been obtained by filling the voids in TiO 2 spheres with carbon and then etching the TiO 2 template with
Delivery of high capacity with good retention is a challenge in developing cathodes for rechargeable sodium-ion batteries. Here we present a radially aligned hierarchical columnar structure in spherical particles with varied chemical composition from the inner end (Na[Ni0.75Co0.02Mn0.23]O2) to the outer end (Na[Ni0.58Co0.06Mn0.36]O2) of the structure. With this cathode material, we show that an electrochemical reaction based on Ni(2+/3+/4+) is readily available to deliver a discharge capacity of
Abstract Herein, a new P2‐type layered oxide is proposed as an outstanding intercalation cathode material for high energy density sodium‐ion batteries (SIBs). On the basis of the stoichiometry of sodium and transition metals, the P2‐type Na 0.55 [Ni 0.1 Fe 0.1 Mn 0.8 ]O 2 cathode is synthesized without impurities phase by partially substituting Ni and Fe into the Mn sites. The partial substitution results in a smoothing of the electrochemical charge/discharge profiles and thus greatly improves t
P3-K<sub>0.69</sub>CrO<sub>2</sub> cathode is successfully synthesized <italic>via</italic> an electrochemical ion-exchange route and delivers excellent cycling stability and power capability in K-ion batteries.
Simultaneous surface MgO coating to bulk Mg doping of Na[Ni<sub>0.5</sub>Mn<sub>0.5</sub>]O<sub>2</sub> cathode produces great synergy in sodium-ion battery performances.
Abstract Designing an optimum cell configuration that can deliver high capacity, fast charge–discharge capability, and good cycle retention is imperative for developing a high‐performance lithium–sulfur battery. Herein, a novel lithium–sulfur cell design is proposed, which consists of sulfur and magnesium–aluminum‐layered double hydroxides (MgAl‐LDH)–carbon nanotubes (CNTs) composite cathode with a modified polymer separator produced by dual side coating approaches (one side: graphene and the ot
Nano-scale Al<sub>2</sub>O<sub>3</sub> coating was effective at resolving the degradation pathways of the cathode surface in sodium-ion batteries.
Manganese (Mn)-based cathode materials have garnered huge research interest for rechargeable aqueous zinc-ion batteries (AZIBs) due to the abundance and low cost of manganese and the plentiful advantages of manganese oxides including their different structures, wide range of phases, and various stoichiometries. A novel in situ generated Mn-deficient ZnMn<sub>2</sub>O<sub>4</sub>@C (Mn-d-ZMO@C) nanoarchitecture cathode material from self-assembly of ZnO-MnO@C for rechargeable AZIBs is reported. A
Spherical O3-type layered Na[Ni<sub>x</sub>Co<sub>y</sub>Mn<sub>z</sub>]O<sub>2</sub> cathodes were synthesized by co-precipitation. An increase in the Ni concentration results in an increase of specific discharge capacity but the corresponding capacity retention and thermal stability progressively decreased.
A rechargeable potassium–sulfur battery based on SPAN cathode and PAA binder demonstrated high reversible capacity and excellent cycling stability.
Based on the reversible conversion reactions, K2Sx (5 ≤ x ≤ 6) →discharge K2S3 →charge K2S5, the proposed K–S battery delivered a high discharge capacity of ∼400 mAh g–1 at 0.1 C-rate with stable cycle retention (94% after 20 cycles) and good rate capability up to 2 C-rate. In addition, instead of an explosive and highly reactive potassium metal electrode, a full cell consisting of an electrochemically potassium-impregnated hard carbon and the K2Sx (5 ≤ x ≤ 6) catholyte was constructed to demons
The development of high‐energy and high‐power density sodium‐ion batteries is a great challenge for modern electrochemistry. The main hurdle to wide acceptance of sodium‐ion batteries lies in identifying and developing suitable new electrode materials. This study presents a composition‐graded cathode with average composition Na[Ni 0.61 Co 0.12 Mn 0.27 ]O 2 , which exhibits excellent performance and stability. In addition to the concentration gradients of the transition metal ions, the cathode is
