Unveiling the Influence of Water Molecules on the Structural Dynamics of Prussian Blue Analogues.

3D-framework Prussian blue analogues (PBAs) are appealing as a cost-effective, sustainable cathodes for Na-ion batteries. However, the aqueous-based synthesis of PBAs inherently introduces three different forms of water molecules (surface, interstitial and crystal) into the structure. Removal of water molecules causes phase transformation from monoclinic (M) to rhombohedral (R).

Characterisation and modelling of potassium-ion batteries.

Potassium-ion batteries (KIBs) are emerging as a promising alternative technology to lithium-ion batteries (LIBs) due to their significantly reduced dependency on critical minerals. KIBs may also present an opportunity for superior fast-charging compared to LIBs, with significantly faster K-ion electrolyte transport properties already demonstrated. In the absence of a viable K-ion electrolyte, a full-cell KIB rate model in commercial cell formats is required to determine the fast-charging potential for KIBs.

The impact of magnesium content on lithium-magnesium alloy electrode performance with argyrodite solid electrolyte.

Solid-state lithium-based batteries offer higher energy density than their Li-ion counterparts. Yet they are limited in terms of negative electrode discharge performance and require high stack pressure during operation. To circumvent these issues, we propose the use of lithium-rich magnesium alloys as suitable negative electrodes in combination with LiPSCl solid-state electrolyte.

A 3.2 V Binary Layered Oxide Cathode for Potassium-Ion Batteries.

Potassium-ion batteries (KIBs) can offer high energy density, cyclability, and operational safety while being economical due to the natural abundance of potassium. Utilizing graphite as an anode, suitable cathodes can realize full cells. Searching for potential cathodes, this work introduces P3-type KNiMnO layered oxide as a potential candidate synthesized by a simple solid-state method.

Mitigating Sodium Ordering for Enhanced Solid Solution Behavior in Layered NaNiO Cathodes.

The O-type layered nickel oxides suffer from undesired cooperative Jahn-Teller distortion stemming from Ni ions and undergo multiple biphasic structural transformations during the insertion/extraction of large Na ions, posing a significant challenge to stabilize the structural integrity. We present here a systematic investigation of the impact of substituting 5 % divalent (Mg) or trivalent (Al or Co) ions for Ni to alleviate Naion ordering and perturb the Jahn-Teller effect to enhance structural stability. We gauge a fundamental understanding of the Mg-O and Na-O or Mg-O-Na bonding interactions, noting that the ionicity of the Mg-O bond deshields the electronic cloud of oxygen from Na ions.

Potassium Cobalt Pyrophosphate as a Nonprecious Bifunctional Electrocatalyst for Zinc-Air Batteries.

Economic and sustainable (ecological) energy storage forms a major pillar of the global energy sector. Bifunctional electrocatalysts, based on oxygen electrolysis, play a key role in the development of rechargeable metal-air batteries. Pursuing precious metal-free economic catalysts, here, we report KCoPO pyrophosphate as a robust cathode for secondary zinc-air batteries with efficient oxygen evolution and oxygen reduction (OER||ORR) activity.

P3-type layered KMnCoO: a novel cathode material for potassium-ion batteries.

P3-type layered KMnCoO was synthesized using a solid-state method. By stabilising into a rhombohedral structure [s.g.

Electrochemical potassium-ion intercalation in NaCoO: a novel cathode material for potassium-ion batteries.

Reversible electrochemical potassium-ion intercalation in P2-type NaCoO was examined for the first time. Hexagonal NaCoO platelets prepared by a solution combustion synthesis technique were found to work as an efficient host for K intercalation. They deliver a high reversible capacity of 82 mA h g, good rate capability and excellent cycling performance up to 50 cycles.