Abstract High energy‐density lithium‐ion batteries are in demand for portable electronic devices and electrical vehicles. Since the energy density of relies heavily on cathode material used, major research efforts have been made to develop alternative materials with a higher degree lithium utilization specific density. In particular, layered, Ni‐rich, transition‐metal oxides can deliver capacity at lower cost than conventional LiCoO 2 . However, these Ni‐rich compounds there still several...

Oxygen reduction reaction (ORR) and oxygen evolution (OER) along with hydrogen (HER) have been considered critical processes for electrochemical energy conversion storage through metal‐air battery, fuel cell, water electrolyzer technologies. Here, a new class of multifunctional electrocatalysts consisting dominant metallic Ni or Co small fraction their oxides anchored onto nitrogen‐doped reduced graphene oxide (rGO) including Co‐CoO/N‐rGO Ni‐NiO/N‐rGO are prepared via pyrolysis cobalt nickel...

A solid solution series of lithium nickel metal oxides, Li[Ni(1-x)M(x)]O2 (with M = Co, Mn, and Al) have been investigated intensively to enhance the inherent structural instability LiNiO2. However, when a voltage range Ni-based cathode materials was increased up >4.5 V, phase transitions occurring above 4.3 V resulted in accelerated formation trigonal (P3m1) NiO phases, leading pulverization during cycling at 60 °C. In an attempt overcome these problems, LiNi0.62Co0.14Mn0.24O2 material with...

Abstract Undesired electrode–electrolyte interactions prevent the use of many high-energy-density cathode materials in practical lithium-ion batteries. Efforts to address their limited service life have predominantly focused on active electrode and electrolytes. Here an advanced three-dimensional chemical imaging analysis a model material, nickel-rich layered lithium transition-metal oxide, reveals dynamic behaviour interphases driven by conductive carbon additives (carbon black) common...

Tremendous research works have been done to develop better cathode materials for a large scale battery be used electric vehicles (EVs). Spinel LiMn2O4 has considered as the most promising among many candidates due its advantages of high thermal stability, low cost, abundance, and environmental affinity. However, it still suffers from surface dissolution manganese in electrolyte at elevated temperature, especially above 60 °C, which leads severe capacity fading. To overcome this barrier, we...

Amorphous SiO2 coating layers with thicknesses of ca. 2, 7, 10, and 15 nm are introduced into bulk@nanowire core@shell Si particles via direct thermal oxidation at 650–850 °C. Of the coated samples, a thickness 7 has best electrochemical performance. This sample shows an initial discharge capacity 2279 mA h g−1 Coulombic efficiency 92% displays 83% retention after 50 cycles 0.2C rate. As service to our authors readers, this journal provides supporting information supplied by authors. Such...

An epitaxy layer on the LiNi_0.8Co_0.1Mn_0.1O₂ cathode significantly suppressed nickel-ion crossover, which enhanced structural/electrochemical stability at high temperature.

The Li‐rich cathode materials have been considered as one of the most promising cathodes for high energy Li‐ion batteries. However, realization these use in batteries is currently limited by their intrinsic problems. To overcome this barrier, a new surface treatment concept proposed which hybrid layer composed reduced graphene oxide (rGO) coating and chemically activated created. A few layers GO are first coated on material, followed hydrazine to produce reducing agent chemical activator Li...

Li‐rich layered metal oxides have attracted much attention for their high energy density but still endure severe capacity fading and voltage decay during cycling, especially at elevated temperature. Here, facile surface treatment of Li 1.17 Ni 0.17 Co Mn 0.5 O 2 (0.4Li MnO 3 ·0.6LiNi 1/3 ) spherical cathode material is designed to address these drawbacks by hybrid protection layers composed Mg 2+ pillar Li‐Mg‐PO 4 layer. As a result, the coated exhibits enhanced cycling stability 60 °C,...

Although various Si-based graphene nanocomposites provide enhanced electrochemical performance, these candidates still yield low initial coloumbic efficiency, electrical disconnection, and fracture due to huge volume changes after extended cycles lead severe capacity fading increase in internal impedance. Therefore, an innovative structure solve problems is needed. In this study, amorphous (a) silicon nanoparticle backboned nanocomposite (a-SBG) for high-power lithium ion battery anodes was...

Understanding the interaction between a catalyst and oxygen has been key step in designing better electrocatalysts for reduction reaction (ORR) as well applying them metal-air batteries fuel cells. Alloying studied to finely tune catalysts' electronic structures afford proper binding affinities oxygen. Herein, we synthesized noble-metal-free nanosized transition metal CuFe alloy encapsulated with graphitic carbon shell highly efficient durable electrocatalyst ORR alkaline solution....

Among the various Ni‐based layered oxide systems in form of LiNi 1‐ y ‐ z Co Al O 2 (NCA), compostions between = 0.1–0.15, 0.05 are most successful and commercialized cathodes used electric vehicles (EVs) hybrid (HEVs). However, tremendous research effort has been dedicted to searching for better composition NCA overcome limitations these cathodes, particularly those that arise when they use at high discharge/charge rates (>5C) temperature (60 °C) environments. In addition, improving...

Li-rich materials are considered the most promising for Li-ion battery cathodes, as high energy densities can be achieved. However, because an activation method is lacking large particles, small particles must used with surface areas, a critical drawback that leads to poor long-term retention and low volumetric densities. Here we propose new material engineering concept overcome these difficulties. Our designed 10 μm-sized secondary composed of submicron scaled flake-shaped primary decrease...

To overcome the chemical instability on exposure to air of Ni-rich materials, a heterostructure composed layered oxide core and Mn-rich LiMn_1.9Al_0.1O₄ shell is explored. The spinel coating alleviates leading superior capacity retention even after air-storage.

A graphene-attached VS₄ composite prepared by a simple hydrothermal method is studied in terms of its lithium reaction mechanism and high rate capability.

Few layered WS2–graphene nanosheet composites are prepared by a simple and scalable hydrothermal reaction subsequent freeze-drying method. The freeze-dried composite exhibits good cycling stability outstanding high-rate capability of lithium storage. reversible capacity remains 647 mA h g−1 after 80 cycles at current density 0.35 A g−1. Comparable capacities 541 296 can still be maintained when even higher densities 7 14 (7 cm−2) respectively.

The Ni‐rich layered oxides with a Ni content of >0.5 are drawing much attention recently to increase the energy density lithium‐ion batteries. However, suffer from aggressive reaction cathode surface organic electrolyte at higher operating voltages, resulting in consequent impedance rise and capacity fade. To overcome this difficulty, we present here heterostructure composed LiNi 0.7 Co 0.15 Mn O 2 core Li‐rich Li 1.2− x 0.2 0.6 shell, incorporating advantageous features structural...

Abstract Für Lithiumionenakkumulatoren mit hohen Energiedichten gibt es eine überaus große Nachfrage im Bereich tragbarer elektronischer Geräte und Elektrofahrzeuge. Weil die der vor allem vom verwendeten Kathodenmaterial abhängen, wird nach alternativen Kathodenmaterialien besserer Lithiumnutzung höherer spezifischer Energiedichte intensiv geforscht. Insbesondere Ni‐reiche Lithium‐Übergangsmetalloxid‐Schichtverbindungen können höhere Kapazitäten als das klassische LiCoO 2 bei geringeren...

In order to keep pace with increasing energy demands for advanced electronic devices and achieve commercialization of electric vehicles energy-storage systems, improvements in high-energy battery technologies are required. Among the various types batteries, lithium ion batteries (LIBs) among most well-developed commercialized systems. LIBs Si anodes Li-rich cathodes one promising alternative electrode materials next-generation, batteries. exhibit high reversible capacities <2000 mAh g(-1)...

Abstract After the research that shows Li 10 GeP 2 S 12 (LGPS)‐type sulfide solid electrolytes can reach high ionic conductivity at room temperature, have been intensively developed with regard to and mechanical properties. As a result, an increasing volume of has conducted employ all‐solid‐state lithium batteries in electric automobiles within next five years. To achieve this goal, it is important review over past decade, understand requirements for future necessary realize practical...

Lithium-ion batteries (LIBs) can be considered as one of the pivotal components required to succeed in drive towards a greener future. However, current processing methods for cathode electrode make it harmful and costly due toxic solvent drying recovery stages. Additionally, reliance on LIBs particularly emphasizes imperative increased energy density both volume weight, which predominantly relies cathode. To surmount these challenges, this research analyses true requirements novel process...

Only a very limited amount of the high theoretical energy density LiCoO 2 as cathode material has been realized, due to its irreversible deterioration when more than 0.6 mol lithium ions are extracted. In this study, new insights into origin such low electrochemical reversibility, namely structural collapse caused by electrostatic repulsion between oxygen during charge process suggested. By incorporating partial cation migration LiNiO , which produces screen effect cations in 3 b ‐Li site,...