황장연 교수

Energy production and storage technologies have attracted a great deal of attention for day-to-day applications. In recent decades, advances in lithium-ion battery (LIB) technology have improved living conditions around the globe. LIBs are used in most mobile electronic devices as well as in zero-emission electronic vehicles. However, there are increasing concerns regarding load leveling of renewable energy sources and the smart grid as well as the sustainability of lithium sources due to their

Abstract The topic of sustainable and eco‐friendly energy storage technologies is an issue of global significance. To date, this heavy burden is solely addressed by lithium‐ion battery technology. However, the ongoing depletion of limited global lithium resources has restricted their future availability for Li‐ion battery technology, and hence, a significant price increase is expected. This grim situation is the driving force for the development of the “beyond Li‐ion battery” strategy involving

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 Ni2+/3+/4+ is readily available to deliver a discharge capacity of 1

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_0.69CrO₂ 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_0.5Mn_0.5]O₂ cathode produces great synergy in sodium-ion battery performances.

Nano-scale Al₂O₃ coating was effective at resolving the degradation pathways of the cathode surface in sodium-ion batteries.

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

We customized a combination of cathode, anode, and electrolyte to develop an LMB capable of cycling both at a high loading capacity and at a high current density that satisfy the capacity and charging rate requirements for future electric vehicles.

Abstract 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 2 O 4 @C (Mn‐d‐ZMO@C) nanoarchitecture cathode material from self‐assembly of ZnO‐MnO@C for rechargeable AZIBs is reported. Analytical

Spherical O3-type layered Na[Ni_xCo_yMn_z]O₂ 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.