Zwitterion Intercalated Manganese Dioxide Nanosheets as High-Performance Cathode Materials for Aqueous Zinc Ion Batteries.

In this study, a novel approach is introduced to address the challenges associated with structural instability and sluggish reaction kinetics of δ-MnO in aqueous zinc ion batteries. By leveraging zwitterionic betaine (Bet) for intercalation, a departure from traditional cation intercalation methods, Bet-intercalated MnO (MnO-Bet) is synthesized. The positively charged quaternary ammonium groups in Bet form strong electrostatic interactions with the negatively charged oxygen atoms in the δ-MnO layers, enhancing structural stability and preventing layer collapse.

MnO superstructure cathode with boosted zinc ion intercalation for aqueous zinc ion batteries.

The simultaneous intercalation of protons and Zn ions in aqueous electrolytes presents a significant obstacle to the widespread adoption of aqueous zinc ion batteries (AZIBs) for large-scale use, a challenge that has yet to be overcome. To address this, we have developed a MnO/tetramethylammonium (TMA) superstructure with an enlarged interlayer spacing, designed specifically to control H/Zn co-intercalation in AZIBs. Within this superstructure, the pre-intercalated TMA ions work as spacers to stabilize the layered structure of MnO cathodes and expand the interlayer spacing substantially by 28 % to 0.

Electrochemical Failure Mechanism of δ-MnO in Zinc Ion Batteries Induced by Irreversible Layered to Spinel Phase Transition.

Phase transitions of Mn-based cathode materials associated with the charge and discharge process play a crucial role on the rate capability and cycle life of zinc ion batteries. Herein, a microscopic electrochemical failure mechanism of Zn-MnO batteries during the phase transitions from δ-MnO to λ-ZnMnO is presented via systematic first-principle investigation. The initial insertion of Zn intensifies the rearrangement of Mn.

Manipulating the crystal plane angle within the primary particle arrangement for the radial ordered structure in a Ni-rich cathode.

Ni-rich cathodes with a radial ordered microstructure have been proved to enhance materials' structural stability. However, the construction process of radial structures has not yet been clearly elaborated. Herein, the formation process of radial structures induced by different doped elements has been systematically investigated.

The benefits of combining 1D and 3D nanofillers in a piezocomposite nanogenerator for biomechanical energy harvesting.

Mechanical energy harvesting using piezoelectric nanogenerators (PNGs) offers an attractive solution for driving low-power portable devices and self-powered electronic systems. Here, we designed an eco-friendly and flexible piezocomposite nanogenerator (c-PNG) based on H(ZrTi)O nanowires (HZTO-nw) and BaCaZrTiO multipods (BCZT-mp) as fillers and polylactic acid (PLA) as a biodegradable polymer matrix. The effects of the applied stress amplitude, frequency and pressing duration on the electric outputs in the piezocomposite nanogenerator (c-PNG) device were investigated by simultaneous recording of the mechanical input and the electrical outputs.

First-principles calculations of bulk WX(X = Se, Te) as anode materials for Na ion battery.

Two-dimensional transition metal dichalcogenides are promising anode materials for Na ion batteries (NIBs). In this study, we carried out a comprehensive investigation to analyze the structural, electrochemical characteristics, and diffusion kinetics of bulk WX(X = Se, Te) by employing first-principles calculation in the framework of density functional theory. We deeply studied the full intercalation of Nain WXand diagnosed NaX phase through conversion reaction mechanism.

LiNiTiFe(PO)/C Electrode Material for Lithium Ion Batteries Exhibiting Faster Kinetics and Enhanced Stability.

Natrium super ionic conductor (NASICON) materials providing attractive properties such as high ionic conductivity and good structural stability are considered as very promising materials for use as electrodes for lithium- and sodium-ion batteries. Herein, a new high-performance electrode material, LiNiTiFe(PO)/C, was synthesized via the sol-gel method and was electrochemically tested as an anode for lithium ion batteries, providing enhanced electrochemical performance as a result of nickel substitution into the lithium site in the LiTi(PO) family of materials. The synthesized material showed good ionic conductivity, excellent structural stability, stable long-term cycling performance, and improved high rate cycling performance compared to LiTi(PO).

Understanding the redox process upon electrochemical cycling of the P2-NaCoMnNiO electrode material for sodium-ion batteries.

Rechargeable sodium-ion batteries have recently attracted renewed interest as an alternative to Li-ion batteries for electric energy storage applications, because of the low cost and wide availability of sodium resources. Thus, the electrochemical energy storage community has been devoting increased attention to designing new cathode materials for sodium-ion batteries. Here we investigate P2- NaCoMnNiO as a cathode material for sodium ion batteries.

New Ni Ti (PO ) @C NASICON-type Electrode Material with High Rate Capability Performance for Lithium-Ion Batteries: Synthesis and Electrochemical Properties.

Ni Ti (PO ) /C NASICON-type phosphate is introduced as a new anode material for lithium-ion batteries (LIBs). Ni Ti (PO ) /C was synthesized through the sol-gel route and delivered some remarkable electrochemical performances. Specifically, the Ni Ti (PO ) /C electrode demonstrates a high rate capability performance and delivers high reversible capacities ranging from 130 mAh g to about 111 mAh g at current rates ranging from 0.

On the P2-NaCo(MnNi)yO Cathode Materials for Sodium-Ion Batteries: Synthesis, Electrochemical Performance, and Redox Processes Occurring during the Electrochemical Cycling.

P2-type NaMO sodiated layered oxides with mixed transition metals are receiving considerable attention for use as cathodes in sodium-ion batteries. A study on solid solution (1 - y)P2-NaCoO-(y)P2-NaMnNiO (y = 0, 1/3, 1/2, 2/3, 1) reveals that changing the composition of the transition metals affects the resulting structure and the stability of pure P2 phases at various temperatures of calcination. For 0 ≤ y ≤ 1.

Effect of Titanium Substitution in a P2-NaCoTiO Cathode Material on the Structural and Electrochemical Properties.

Worries about lithium supplies have led to the development of research on sodium batteries. Sodium-ion batteries are regarded as the next generation of energy-storage devices thanks to the generous resources of sodium. In spite of that, structural changes in the electrode materials remain the main challenge of this storage technology.

Electrochemical lithiation/delithiation of SnP₂O₇ observed by in situ XRD and ex situ⁷Li/³¹P NMR, and ¹¹⁹Sn Mössbauer spectroscopy.

SnP2O7 was prepared by a sol-gel route. The structural changes of tin pyrophosphate during the electrochemical lithiation were followed by using in situ XRD measurements that reveal the existence of a crystalline phase at the beginning of the discharge process. Nevertheless, it becomes amorphous after the full discharge as a result of a conversion reaction leading to the formation of LixSny alloys.

Passivation Layer and Cathodic Redox Reactions in Sodium-Ion Batteries Probed by HAXPES.

The cathode material P2-Nax Co2/3 Mn2/9 Ni1/9 O2, which could be used in Na-ion batteries, was investigated through synchrotron-based hard X-ray photoelectron spectroscopy (HAXPES). Nondestructive analysis was made through the electrode/electrolyte interface of the first electrochemical cycle to ensure access to information not only on the active material, but also on the passivation layer formed at the electrode surface and referred to as the solid permeable interface (SPI). This investigation clearly shows the role of the SPI and the complexity of the redox reactions.