Improved efficiency and cyclability of cells containing LiBr demonstrate that the appropriate choice electrolyte solution is key to a successful Li–O₂ battery.

Although lithium–oxygen batteries are attracting considerable attention because of the potential for an extremely high energy density, their practical use has been restricted owing to a low efficiency and poor cycle life compared lithium-ion batteries. Here we present nanostructured cathode based on molybdenum carbide nanoparticles (Mo2C) dispersed carbon nanotubes, which dramatically increase electrical up 88% with more than 100 cycles. We found that Mo2C nanoparticle catalysts contribute...

A novel lithium–oxygen battery exploiting PYR14TFSI–LiTFSI as ionic liquid-based electrolyte medium is reported. The Li/PYR14TFSI–LiTFSI/O2 was fully characterized by electrochemical impedance spectroscopy, capacity-limited cycling, field emission scanning electron microscopy, high-resolution transmission and X-ray photoelectron spectroscopy. results of this extensive study demonstrate that new Li/O2 cell a stable electrode–electrolyte interface highly reversible charge–discharge cycling...

This work deals with core issues of Li–oxygen battery systems; intrinsic stability polyether electrolyte solutions and the role important redox mediators such as LiI/I₂.

The kinetics and thermodynamics of oxygen reduction reactions (ORR) in aprotic Li electrolyte were shown to be highly dependent on the surrounding chemical environment electrochemical conditions. Numerous reports have demonstrated importance high donor number (DN) solvents for enhanced ORR, attributed this phenomenon stabilizing interactions between reduced species solvent molecules. We focus herein often overlooked effect salt used solution. show that level dissociation plays a significant...

Abstract Recently, various approaches for adding redox mediators to electrolytes and introducing protective layers onto Li metal have been suggested overcome the low energy efficiency poor cycle life of Li–O 2 batteries. However, catalytic effect mediator oxygen evolution gradually deteriorates during repeated cycling owing its decomposition at surfaces both electrode (cathode) (anode). Here, optimized batteries are designed with a continuously effective stable layer by optimizing LiBr...

Abstract Non-aqueous lithium-oxygen batteries cycle by forming lithium peroxide during discharge and oxidizing it recharge. The significant problem of the solid insulating can greatly be facilitated incorporating redox mediators that shuttle electron-holes between porous substrate peroxide. Redox mediator stability is thus key for energy efficiency, reversibility, life. However, gradual deactivation repeated cycling has not conclusively been explained. Here, we show organic are predominantly...

A silicon (Si) anode is a high-capacity alternative for carbonaceous anodes in lithium ion batteries. However, large volume change during cycling and continuous side reactions with the electrolyte significantly limit its applications. We designed localized high-concentration using 1H,1H,5H-octafluoropentyl 1,1,2,2-tetrafluoroethyl ether (OTE) as diluent desired molecular structure tailored Si operating over wide temperature range. This exhibits an optimized solvation enabled better stability...

A new concept of an elemental iron-based sodium ion battery PC–Fe₃O₄/Na₂FeP₂O₇ was reported, and it is the first example to introduce element-rich configuration in from viewpoint sustainability.

A positive effect of the polyacrylic acid (PAA)-carboxymethyl cellulose (CMC) binder to enhance performance an oxide-based anode was reported in batteries. series super high capacity and cycling ability oxide powders rarely achieved before obtained, particularly most them without any specific carbon modification and/or morphology control.

NCL is rationally designed as the stable protective layer on Li metal for dendrite- and oxygen-proof in Li–O₂ batteries.

Abstract Lithium–oxygen batteries are in fact the only rechargeable that can rival internal combustion engines, terms of high energy density. However, they still under development due to low‐efficiency and short lifetime issues. There problems side reactions on cathode side, reactivity Li anode with solution species, consumption redox mediators via metallic lithium. Therefore, efforts made protect/block lithium metal these cells, order mitigate reactions. new approach is required solve...

Lithium–oxygen (Li–O2) batteries with high reversibility require a stable electrolyte against the side reactions Li-metal anode and reactive oxygen species. Moreover, an that can effectively utilize low partial pressure of in atmosphere has significant effect on practical application Li–air batteries. In this study, localized high-concentration (LHCE) was developed using 1H,1H,5H-octafluoropentyl 1,1,2,2-tetrafluoroethyl ether (OTE) as diluent, which satisfies all these conditions...

This work highlights recent progress on K metal as an anode and provides a valuable outlook the scientific practical issues concerning development of rechargeable potassium-based battery systems.

Owing to the high theoretical capacity, low operating potentials, and natural abundance, silicon (Si) is considered as one of most promising anode materials for lithium-ion batteries. However, a large volume change during alloying–dealloying often results in pulverization, electrical contact loss, unstable solid-electrolyte interphase (SEI) formation, leading rapid capacity fading. We present rational encapsulation strategy silicon–carbon (Si–C) composite high-performance material batteries...

Abstract A stable electrolyte is critical for practical application of lithium–oxygen batteries (LOBs). Although the ionic conductivity and electrochemical stability electrolytes have been extensively investigated before, their oxygen solubility, viscosity, volatility, against singlet ( 1 O 2 ) still need to be comprehensively provide a full picture electrolytes, especially an open system such as LOBs. Herein, systematic investigation reported on localized high‐concentration (LHCEs) using...

ADVERTISEMENT RETURN TO ISSUEPREVViewpointNEXTControversial Topics on Lithium Superoxide in Li–O2 BatteriesWon-Jin Kwak†, Jin-Bum Park†, Hun-Gi Jung‡, and Yang-Kook Sun*†View Author Information† Department of Energy Engineering, Hanyang University, Seoul 133-791, Republic Korea‡ Center for Convergence Research, Green City Technology Institute, Korea Institute Science Technology, 136-791, Korea*E-mail: [email protected]. Tel: +82-2-2220-0524. Fax: +81-2-2292-7329.Cite this: ACS Lett. 2017, 2,...

Abstract The lithium storage capacity of an iron oxide‐based anode porous carbon–Fe 3 O 4 (i.e., PC–Fe ) was investigated by varying the initial current and mass density electrode to achieve a good utilization coefficient oxide. It confirmed that these factors largely affected certain key high area (μAh cm −2 ). Moreover, chemical electrochemical lithiation were related time pressure both systemically studied. After optimization, new battery /Li[Ni 0.59 Co 0.16 Mn 0.25 ]O 2 with 748 μAh...

FeCo bimetal decorated CNTs were synthesized as highly efficient and cost-effective non-noble metal catalysts for Li-O₂batteries.

Li–O2 batteries are plagued by side reactions that cause poor rechargeability and efficiency. These were recently revealed to be predominantly caused singlet oxygen, which can neutralized chemical traps or physical quenchers. However, irreversibly consumed thus only active for a limited time, so far identified quenchers lack oxidative stability suitable typically required recharge potentials. Thus, reducing the charge potential within limit of quencher and/or finding more stable is required....

Due to their high theoretical specific capacity and energy density, LiO 2 batteries are considered as candidates for next‐generation battery systems in place of conventional Li‐ion advanced applications such electric vehicles. However, low efficiency, poor cycle life, Li‐metal safety issues make the use yet impractical. In addition, actual cell capacities very low, since only small‐scale electrodes currently tested, it is hard predict properties large‐size cells, thus evaluating judging...