Wang Hay Kan
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View article: A medium-entropy garnet-type oxide as a solid electrolyte with enhanced air stability for Li-ion batteries
A medium-entropy garnet-type oxide as a solid electrolyte with enhanced air stability for Li-ion batteries Open
A novel medium-entropy garnet Li 6.5 La 3 Zr 0.5 Ta 0.5 Nb 0.5 Y 0.5 O 12 (LLZTNYO) was synthesized via a solid-phase method. LLZTNYO exhibited high Li-ion conductivity (1.87 × 10 −4 S cm −1 ) and maintained for 30 days in an air without d…
View article: A Li‐Rich Fluorinated Lithium Zirconium Chloride Solid Electrolyte for 4.8 V‐Class All‐Solid‐State Batteries
A Li‐Rich Fluorinated Lithium Zirconium Chloride Solid Electrolyte for 4.8 V‐Class All‐Solid‐State Batteries Open
Chloride solid‐state electrolytes (SEs) represent an important advance for applications in all‐solid‐state batteries (ASSBs). Among various chloride SEs, lithium zirconium chloride (Li 2 ZrCl 6 ) is an attractive candidate considering the …
View article: Promoting high-voltage stability through local lattice distortion of halide solid electrolytes
Promoting high-voltage stability through local lattice distortion of halide solid electrolytes Open
Stable solid electrolytes are essential to high-safety and high-energy-density lithium batteries, especially for applications with high-voltage cathodes. In such conditions, solid electrolytes may experience severe oxidation, decomposition…
View article: Over‐Stoichiometric Metastabilization of Cation‐Disordered Rock Salts
Over‐Stoichiometric Metastabilization of Cation‐Disordered Rock Salts Open
Cation‐disordered rock salts (DRXs) are well known for their potential to realize the goal of achieving scalable Ni‐ and Co‐free high‐energy‐density Li‐ion batteries. Unlike in most cathode materials, the disordered cation distribution may…
View article: Solvent-free mechanochemical synthesis of organic proton conducting salts incorporating imidazole and dicarboxylic acids
Solvent-free mechanochemical synthesis of organic proton conducting salts incorporating imidazole and dicarboxylic acids Open
Solventless mechanochemical synthesis by manual grinding was applied to grow organic proton conducting salts, imidazole-succinic acid (C3H4N2-HOOC(CH2)2COOH) and imidazole-glutaric acid (C3H4N2-HOOC(CH2)3COOH). This synthesis method induce…
View article: Evaluation of polymorphism and charge transport in a BaO–CaO–Ta<sub>2</sub>O<sub>5</sub> perovskite phase diagram using TOF-neutron and synchrotron X-ray diffraction, the bond-valence method and impedance spectroscopy
Evaluation of polymorphism and charge transport in a BaO–CaO–Ta<sub>2</sub>O<sub>5</sub> perovskite phase diagram using TOF-neutron and synchrotron X-ray diffraction, the bond-valence method and impedance spectroscopy Open
In the present work, we develop a comprehensive functional phase diagram for the Ba–Ca–Ta–O quaternary system Ba 3 Ca 1+ x Ta 2− x O 9−3 x /2 (0 ≤ x ≤ 0.36) between 1000 and 1550 °C, coupled with theoretical calculations of the cationic or…
View article: Layered-rocksalt intergrown cathode for high-capacity zero-strain battery operation
Layered-rocksalt intergrown cathode for high-capacity zero-strain battery operation Open
The dependence on lithium-ion batteries leads to a pressing demand for advanced cathode materials. We demonstrate a new concept of layered-rocksalt intergrown structure that harnesses the combined figures of merit from each phase, includin…
View article: Enabling Facile Anionic Kinetics through Cationic Redox Mediator in Li-Rich Layered Cathodes
Enabling Facile Anionic Kinetics through Cationic Redox Mediator in Li-Rich Layered Cathodes Open
Anionic oxygen redox has aroused great interests in developing high-capacity Li-ion battery cathode materials. The fundamental understanding of this concept, compared to cationic redox, has promoted extensive studies on lithium transition …
View article: Structural and Electrochemical Impacts of Mg/Mn Dual Dopants on the LiNiO<sub>2</sub> Cathode in Li-Metal Batteries
Structural and Electrochemical Impacts of Mg/Mn Dual Dopants on the LiNiO<sub>2</sub> Cathode in Li-Metal Batteries Open
Doping chemistry has been regarded as an efficient strategy to overcome some fundamental challenges facing the "no-cobalt" LiNiO2 cathode materials. By utilizing the doping chemistry, we evaluate the battery performance and structural/chem…
View article: Distinct Surface and Bulk Thermal Behaviors of LiNi<sub>0.6</sub>Mn<sub>0.2</sub>Co<sub>0.2</sub>O<sub>2</sub> Cathode Materials as a Function of State of Charge
Distinct Surface and Bulk Thermal Behaviors of LiNi<sub>0.6</sub>Mn<sub>0.2</sub>Co<sub>0.2</sub>O<sub>2</sub> Cathode Materials as a Function of State of Charge Open
Understanding how structural and chemical transformations take place in particles under thermal conditions can inform designing thermally robust electrode materials. Such a study necessitates the use of diagnostic techniques that are capab…
View article: Dopant Distribution in Co-Free High-Energy Layered Cathode Materials
Dopant Distribution in Co-Free High-Energy Layered Cathode Materials Open
The practical implementation of Co-free, LiNiO2-derived cathodes has been prohibited by their poor cycle life and thermal stability, resulting from the structural instability, phase transformations, reactive surfaces, and chemomechanical b…
View article: An Ordered P2/P3 Composite Layered Oxide Cathode with Long Cycle Life in Sodium-Ion Batteries
An Ordered P2/P3 Composite Layered Oxide Cathode with Long Cycle Life in Sodium-Ion Batteries Open
Developing stable cathode materials represents a crucial step toward long-life sodium-ion batteries. P2-type layered oxides are important as cathodes for their reversibility, but their long-term performance in full cells remains a key chal…
View article: Understanding Performance Degradation in Cation‐Disordered Rock‐Salt Oxide Cathodes
Understanding Performance Degradation in Cation‐Disordered Rock‐Salt Oxide Cathodes Open
The collective redox activities of transition‐metal (TM) cations and oxygen anions have been shown to increase charge storage capacity in both Li‐rich layered and cation‐disordered rock‐salt cathodes. Repeated cycling involving anionic red…
View article: Surface Characterization of Li-Substituted Compositionally Heterogeneous NaLi<sub>0.045</sub>Cu<sub>0.185</sub>Fe<sub>0.265</sub>Mn<sub>0.505</sub>O<sub>2</sub> Sodium-Ion Cathode Material
Surface Characterization of Li-Substituted Compositionally Heterogeneous NaLi<sub>0.045</sub>Cu<sub>0.185</sub>Fe<sub>0.265</sub>Mn<sub>0.505</sub>O<sub>2</sub> Sodium-Ion Cathode Material Open
The understanding of surface chemical and structural processes can provide some insights into designing stable sodium cathode materials. Herein, Li-substituted and compositionally heterogeneous NaLi0.045Cu0.185Fe0.265Mn0.505O2 is used as a…
View article: Evolution of Local Structural Ordering and Chemical Distribution upon Delithiation of a Rock Salt–Structured Li<sub>1.3</sub>Ta<sub>0.3</sub>Mn<sub>0.4</sub>O<sub>2</sub> Cathode
Evolution of Local Structural Ordering and Chemical Distribution upon Delithiation of a Rock Salt–Structured Li<sub>1.3</sub>Ta<sub>0.3</sub>Mn<sub>0.4</sub>O<sub>2</sub> Cathode Open
Lithium‐rich disordered rock‐salt oxides have attracted great interest owing to their promising performance as Li‐ion battery cathodes. While experimental and theoretical efforts are critical in advancing this class of materials, a fundame…
View article: Lithium‐Ion Batteries: Inducing Favorable Cation Antisite by Doping Halogen in Ni‐Rich Layered Cathode with Ultrahigh Stability (Adv. Sci. 4/2019)
Lithium‐Ion Batteries: Inducing Favorable Cation Antisite by Doping Halogen in Ni‐Rich Layered Cathode with Ultrahigh Stability (Adv. Sci. 4/2019) Open
In article number 1801406, Daobin Mu, Feng Wu, and co‐workers propose a mechanism of favorable antisite induced by bulk halogen‐doped in Ni‐rich layered cathode material for lithium‐ion batteries. The LiNi0.85Co0.075Mn0.075O2 (LNCM) cathod…
View article: Correction: Consolidating the grain boundary of the garnet electrolyte LLZTO with Li<sub>3</sub>BO<sub>3</sub> for high-performance LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub>/LiFePO<sub>4</sub> hybrid solid batteries
Correction: Consolidating the grain boundary of the garnet electrolyte LLZTO with Li<sub>3</sub>BO<sub>3</sub> for high-performance LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub>/LiFePO<sub>4</sub> hybrid solid batteries Open
Correction for ‘Consolidating the grain boundary of the garnet electrolyte LLZTO with Li3BO3 for high-performance LiNi0.8Co0.1Mn0.1O2/LiFePO4 hybrid solid batteries’ by Huilin Xie et al., J. Mater. Chem. A, 2019, DOI: 10.1039/c9ta03263k.
View article: Hybrid Preheating Method for Lithium-ion Battery Used in Cold Environment
Hybrid Preheating Method for Lithium-ion Battery Used in Cold Environment Open
：Due to the poor charge-discharge performance of lithium-ion batteries and the lithium precipitation during the charging process in cold environment, which may even result in safety accidents, it is necessary and urgent to preheat lithium-…
View article: Inducing Favorable Cation Antisite by Doping Halogen in Ni‐Rich Layered Cathode with Ultrahigh Stability
Inducing Favorable Cation Antisite by Doping Halogen in Ni‐Rich Layered Cathode with Ultrahigh Stability Open
The cation antisite is the most recognizable intrinsic defect type in nickel‐rich layered and olivine‐type cathode materials for lithium‐ion batteries, and important for electrochemical/thermal performance. While how to generate the favora…
View article: Unravelling Solid-State Redox Chemistry in Li<sub>1.3</sub>Nb<sub>0.3</sub>Mn<sub>0.4</sub>O<sub>2</sub> Single-Crystal Cathode Material
Unravelling Solid-State Redox Chemistry in Li<sub>1.3</sub>Nb<sub>0.3</sub>Mn<sub>0.4</sub>O<sub>2</sub> Single-Crystal Cathode Material Open
Recent reports on high capacities delivered by Li-excess transition-metal oxide cathodes have triggered intense interest in utilizing reversible oxygen redox for high-energy battery applications. To control oxygen electrochemical activitie…