Precise Synthesis of 4.75 V-Tolerant LiCoO with Homogeneous Delithiation and Reduced Internal Strain.

The rapid advancements in 3C electronic devices necessitate an increase in the charge cutoff voltage of LiCoO to unlock a higher energy density that surpasses the currently available levels. However, the structural devastation and electrochemical decay of LiCoO are significantly exacerbated, particularly at ≥4.5 V, due to the stress concentration caused by more severe lattice expansion and shrinkage, coupled with heterogeneous Li intercalation/deintercalation reactions.

Tailoring the Electrode-Electrolyte Interface for Reliable Operation of All-Climate 4.8 V Li||NCM811 Batteries.

Combining high-voltage nickel-rich cathodes with lithium metal anodes is among the most promising approaches for achieving high-energy-density lithium batteries. However, most current electrolytes fail to simultaneously satisfy the compatibility requirements for the lithium metal anode and the tolerance for the ultra-high voltage NCM811 cathode. Here, we have designed an ultra-oxidation-resistant electrolyte by meticulously adjusting the composition of fluorinated carbonates.

A Rechargeable "Rocking Chair" Type Zn-CO Battery.

Rising global temperatures and critical energy shortages have spurred researches into CO fixation and conversion within the realm of energy storage such as Zn-CO batteries. However, traditional Zn-CO batteries employ double-compartment electrolytic cells with separate carriers for catholytes and anolytes, diverging from the "rocking chair" battery mechanism. The specific energy of these conventional batteries is constrained by the solubility of discharge reactants/products in the electrolyte.

Facilitating an Ultrastable O3-Type Cathode for 4.5 V Sodium-Ion Batteries via a Dual-Reductive Coupling Mechanism.

O3-type layered oxides for sodium-ion batteries (SIBs) have attracted extensive attention due to their inherently sufficient Na content, which have been considered as one of the most promising candidates for practical applications. However, influenced by the irreversible oxygen loss and the phase transition of O3-P3, the O3-type cathodes are always limited by low cutoff voltages (typically <4.2 V), restraining the full release of the capacity.

Perspective on High-Stability Single-Crystal Li-Rich Cathode Materials for Li-Ion Batteries.

Benefiting from anionic and cationic redox reactions, Li-rich materials have been regarded as next-generation cathodes to overcome the bottleneck of energy density. However, they always suffer from cracking of polycrystalline (PC) secondary particles and lattice oxygen release, resulting in severe structural deterioration and capacity decay upon cycling. Single-crystal (SC) design has been proven as an effective strategy to relieve these issues in traditional Li-rich cathodes with PC morphology.

A solid-state lithium-ion battery with micron-sized silicon anode operating free from external pressure.

Applying high stack pressure (often up to tens of megapascals) to solid-state Li-ion batteries is primarily done to address the issues of internal voids formation and subsequent Li-ion transport blockage within the solid electrode due to volume changes. Whereas, redundant pressurizing devices lower the energy density of batteries and raise the cost. Herein, a mechanical optimization strategy involving elastic electrolyte is proposed for SSBs operating without external pressurizing, but relying solely on the built-in pressure of cells.

Boosting a practical Li-CO battery through dimerization reaction based on solid redox mediator.

Li-CO batteries offer a promising avenue for converting greenhouse gases into electricity. However, the inherent challenge of direct electrocatalytic reduction of inert CO often results in the formation of LiCO, causing a dip in output voltage and energy efficiency. Our innovative approach involves solid redox mediators, affixed to the cathode via a Cu(II) coordination compound of benzene-1,3,5-tricarboxylic acid.

A Bio-Inspired Trehalose Additive for Reversible Zinc Anodes with Improved Stability and Kinetics.

The moderate reversibility of Zn anodes, as a long-standing challenge in aqueous zinc-ion batteries, promotes the exploration of suitable electrolyte additives continuously. It is crucial to establish the absolute predominance of smooth deposition within multiple interfacial reactions for stable zinc anodes, including suppressing side parasitic reactions and facilitating Zn plating process. Trehalose catches our attention due to the reported mechanisms in sustaining biological stabilization.

Bifunctional electrolyte additive MgI for improving cycle life in high-efficiency redox-mediated Li-O batteries.

Here, MgI is introduced as a bifunctional self-defense redox mediator into dimethyl sulfoxide-based Li-O batteries. During charging, I is first oxidized to I, which facilitates the decomposition of LiO, and thus reduces overpotential. In addition, Mg spontaneously reacts with the Li anode to form a very stable SEI layer containing MgO, which can resist the synchronous attack by the soluble I and improve the interface stability between the Li anode and the electrolyte.

Trifunctional imidazolium bromide: a high-efficiency redox mediator for high-performance Li-O batteries.

In this work, 1-aminopropyl-3-methylimidazolium bromide (APMImBr) is introduced in dimethyl sulfoxide-based Li-O batteries. The Br functions as a redox mediator to catalyze the decomposition of the LiO products. Meanwhile, the APMIm serves as a scavenging agent for superoxide radicals as well as protects the lithium metal anodes an formed LiN-rich solid electrolyte interface layer.

Modulation of Local Charge Distribution Stabilized the Anionic Redox Process in Mn-Based P2-Type Layered Oxides.

An anionic redox reaction is an extraordinary method for obtaining high-energy-density cathode materials for sodium-ion batteries (SIBs). The commonly used inactive-element-doped strategies can effectively trigger the O redox activity in several layered cathode materials. However, the anionic redox reaction process is usually accompanied by unfavorable structural changes, large voltage hysteresis, and irreversible O loss, which hinders its practical application to a large extent.

Binuclear Cu complex catalysis enabling Li-CO battery with a high discharge voltage above 3.0 V.

Li-CO batteries possess exceptional advantages in using greenhouse gases to provide electrical energy. However, these batteries following LiCO-product route usually deliver low output voltage (<2.5 V) and energy efficiency.

Fluorinated Rocksalt Cathode with Ultra-high Active Li Content for Lithium-ion Batteries.

The key to increasing the energy density of lithium-ion batteries is to incorporate high contents of extractable Li into the cathode. Unfortunately, this triggers formidable challenges including structural instability and irreversible chemistry under operation. Here, we report a new kind of ultra-high Li compound: Li MoO F (1≤x≤3) for cathode with an unprecedented level of electrochemically active Li (>3 Li per formula), delivering a reversible capacity up to 438 mAh g .

Dual Honeycomb-Superlattice Enables Double-High Activity and Reversibility of Anion Redox for Sodium-Ion Battery Layered Cathodes.

Anion redox contributes to the anomalous capacity exceeding the theoretical limit of layered oxides. However, double-high activity and reversibility is challenging due to the structural rearrangement and potential oxygen loss. Here, we propose a strategy for constructing a dual honeycomb-superlattice structure in Na [Li Mn ][Mg Mn ]O to simultaneously realize high activity and reversibility of lattice O redox.

Achieving long cycle life for all-solid-state rechargeable Li-I battery by a confined dissolution strategy.

Rechargeable Li-I battery has attracted considerable attentions due to its high theoretical capacity, low cost and environment-friendliness. Dissolution of polyiodides are required to facilitate the electrochemical redox reaction of the I cathode, which would lead to a harmful shuttle effect. All-solid-state Li-I battery totally avoids the polyiodides shuttle in a liquid system.

Diagnosing the SEI Layer in a Potassium Ion Battery Using Distribution of Relaxation Time.

Understanding the solid electrolyte interphase (SEI) formation process in novel battery systems is of primary importance. Alongside increasingly powerful in situ techniques, searching for readily accessible, noninvasive, and low-cost tools to probe battery chemistry is highly demanded. Here, we applied distribution of relaxation time analysis to interpret in situ electrochemical impedance spectroscopy results during cycling, which is able to distinguish various electrochemical processes based on their time constants.

A β-FeOOH/MXene sandwich for high-performance anodes in lithium-ion batteries.

FeOOH is one of the earth abundant and high-capacity anode materials for lithium-ion batteries (LIBs), but faces problems of inevitable structure collapse and thus poor capacity retention. Herein, we report a composite of β-FeOOH/TiCT MXene sandwich by an intercalation of β-FeOOH nanorods within single-layer TiCT MXene flakes. After 100 cycles, the β-FeOOH/TiCT composite retains a capacity of 937.

Disproportionation of Sodium Superoxide in Metal-Air Batteries.

The sodium oxygen battery is a promising metal-air battery; however, the discharge process is not well understood and the major discharge product is still under debate. The discharge products determined the theoretical specific energy and electrochemical performance of the battery. Now it is demonstrated that NaO spontaneously disproportionates to Na O , no matter whether it is dissolved in solution or stays on the surface.