Emerging Catalysts to Promote Kinetics of Lithium–Sulfur Batteries

It is of fundamental and technological significance to develop dual-role anode materials for both lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) with high performance. Here, a composite material based on CoSe2 nanoparticles encapsulated in N-doped carbon framework intertwined with carbon nanotubes (CoSe2@N-CF/CNTs) is prepared successfully from cobalt-based zeolitic imidazolate framework (ZIF-67). As anode materials for LIBs, CoSe2@N-CF/CNTs composites deliver a reversible capacity of 428 mAh g-1 even after 500 cycles at a current density of 1 A g-1 with almost 100% Coulombic efficiency. The charge and discharge mechanisms of CoSe2 are characterized using ex situ X-ray diffraction and Raman analysis, from which the lithiation products of CoSe2 are found to be Li x CoSe2 and Li2Se, which are further converted to CoSe2 upon delithiation. The CoSe2@N-CF/CNTs composites also demonstrate excellent electrochemical performance as anode materials for SIBs with a carbonate-based electrolyte, with specific capacities of 606 and 501 mAh g-1 at 0.1 and 1 A g-1 in the 100th cycle. The electrochemical performance of the anode materials is further studied by pseudocapacitance and galvanostatic intermittent titration technique (GITT) measurements. This work may be exploited for the rational design and development of dual-role anode materials for both Li- and Na-ion batteries.

https://onlinelibrary.wiley.com/doi/pdf/10.1002/advs.201800763

CoSe2 Nanoparticles Encapsulated by N-Doped Carbon Framework Intertwined with Carbon Nanotubes: High-Performance Dual-Role Anode Materials for Both Li- and Na-Ion Batteries.

Synthesis of MOF-derived nanostructures and their applications as anodes in lithium and sodium ion batteries

MXene combining high metal-like conductivity, high hydrophilicity, and abundant surface functional groups has been recognized as a class of versatile two-dimensional materials for many applications. However, the aggregation of MXene nanosheets from interlayer van der Waals force and hydrogen bonds represents a major problem that severely limits their practical use. Here, we report an aerogel structure of MOFs@MXene, in which the in situ formed MOF particles can effectively prevent the accumulation of MXene, enabling a three-dimensional (3D) hierarchical porous conductive network to be composed with an ultralight feature. Subsequently, a 3D porous MXene aerogel threaded hollow CoS nanobox composite ((CoS NP@NHC)@MXene) derived from the MOFs@MXene aerogel precursor was synthesized, and the highly interconnected MXene network and hierarchical porous structure coupled with the ultrafine nanocrystallization of the electrochemically active phase of CoS yield the hybrid system with excellent electron and ion transport properties. Benefiting from the synergistic effect of the components, the (CoS NP@NHC)@MXene composite manifests outstanding electrochemistry properties as electrode materials for all of the lithium-ion batteries (LIBs), sodium-ion batteries (SIBs), and potassium-ion batteries (PIBs). It demonstrated the excellent cycle stability and high capacities of 1145.9 mAh g-1 at 1 A g-1 after 800 cycles and 574.1 mAh g-1 at 5 A g-1 after 1000 cycles for LIBs, 420 mAh g-1 at 2 A g-1 after 650 cycles for SIBs, and 210 mAh g-1 at 2 A g-1 after 500 cycles for PIBs. First-principle calculations confirmed that the (CoS NP@NHC)@MXene hybrid could enhance the charge transfer reaction kinetics, particularly at the interface. More importantly, the excellent rate performance under high mass loading and the high volumetric energy and power density of the entire electrode represent the potential of (CoS NP@NHC)@MXene composites for applications to practical electrochemical energy storage devices. The synthesis method reported in this Article is versatile and can be easily extended to produce other porous MXene-aerogel-based materials for various applications.

Three-Dimensional MOFs@MXene Aerogel Composite Derived MXene Threaded Hollow Carbon Confined CoS Nanoparticles toward Advanced Alkali-Ion Batteries.

Metal selenides for high performance sodium ion batteries

PdRu alloy nanoparticles of solid solution in atomic scale: outperformance towards formic acid electro-oxidation in acidic medium

Ruthenium nanoparticles (2.06 ± 0.46 nm in diameter) stabilized by 1-hexyl-4-isocyanobenzene (CNBH), denoted as RuCNBH, were prepared by the self-assembly of isonitrile molecules onto the surface of “bare” Ru colloids by virtue of the formation of Ru=C=N− interfacial bonds. FTIR measurements showed that the stretching vibration of the terminal −N≡C bonds at 2119 cm−1 for the monomeric ligands disappeared and concurrently three new bands at 2115, 2043, and 1944 cm−1 emerged with RuCNBH nanoparticles, which was ascribed to the transformation of −N≡C to Ru=C=N− by back donation of Ru-d electrons to the π* orbital of the organic ligands. Metathesis reaction of RuCNBH with vinyl derivatives further corroborated the nature of the Ru=C interfacial bonds. When 1-isocyanopyrene (CNPy) was bounded onto the Ru nanoparticles surface through Ru=C=N interfacial bond (denoted as RuCNPy), the emission maximum was found to red-shift by 27 nm, as compared to that of the CNPy monomers, along with a reduced fluorescence lifetime, due to intraparticle charge delocalization that arose from the conjugated Ru=C=N− interfacial bonds. The results of this study further underline the significance of metal−organic interfacial bonds in the control of intraparticle charge-transfer dynamics and the optical and electronic properties of metal nanoparticles.

Isonitrile-functionalized ruthenium nanoparticles: intraparticle charge delocalization through Ru=C=N interfacial bonds

The invention belongs to the technical field of lithium batteries, and discloses a lithium-selenium battery positive electrode material capable of reducing loss of polyselenide, an electrode plate anda button cell The positive electrode material of the lithium-selenium battery is prepared by the following steps of (1) preparing cobalt-containing porous carbon; (2) mixing elemental selenium withthe cobalt-containing porous carbon, heating and reacting in a protective atmosphere to obtain the positive electrode material, wherein the heating reaction temperature ranges from 200 DEG C to 300 DEG C The electrode plate is prepared from the positive electrode material The button cell comprises the electrode plate The mesoporous structure of the porous carbon matrix in the positive electrodematerial disclosed by the invention is connected in a staggered manner, so that the diffusion of electrons and ions is facilitated, and in addition, the volume expansion of selenium in the charging and discharging process can be reduced; and the positive electrode material can prevent the polyselenide from being dissolved, so that the loss of polyselenide is reduced; and the positive electrode material disclosed by the invention has excellent electrochemical performance

Lithium-selenium battery positive electrode material capable of reducing loss of polyselenide, electrode plate and button cell

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Papers

CoSe2 Nanoparticles Encapsulated by N-Doped Carbon Framework Intertwined with Carbon Nanotubes: High-Performance Dual-Role Anode Materials for Both Li- and Na-Ion Batteries.

PdRu alloy nanoparticles of solid solution in atomic scale: outperformance towards formic acid electro-oxidation in acidic medium

Isonitrile-functionalized ruthenium nanoparticles: intraparticle charge delocalization through Ru=C=N interfacial bonds

Lithium-selenium battery positive electrode material capable of reducing loss of polyselenide, electrode plate and button cell