How electrolyte additives work in Li-ion batteries

Qian, Yunxian; Hu, Shiguang; Zou, Xianshuai; Deng, Zixin; Xu, Yuqun; Cao, Zongze; Deng, Yuanfu; Shi, Qiao; Xu, Kang; Deng, Yonghong

doi:10.1016/j.ensm.2018.11.015

Cited by 99 publications

(81 citation statements)

References 43 publications

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“…Another observation, which supports the slow IT step, is related to the very pronounced effect of solvent [ 43 ] and various additives, [ 44,45 ] which alter the structure of the electrode/electrolyte interface, on the intercalation rates. [ 41,45–47 ] The activation energy of charge transfer increases significantly [ 47 ] when the surface of the material is covered by the products of the electrolyte decomposition reactions, i.e., SEI [ 48 ] (solid electrolyte interface on the anode) or cathode/electrolyte interface [ 49 ] (CEI) layers, while in the case when no surface layers are present at the material surface (e.g., in aqueous solutions), the activation energy reduces sharply.…”

Section: Rate‐determining Steps In Ion Intercalation Processesmentioning

confidence: 99%

Metal‐Ion Coupled Electron Transfer Kinetics in Intercalation‐Based Transition Metal Oxides

Nikitina

Vassiliev

Stevenson

2020

Advanced Energy Materials

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Intensive research in the field of lithium ion intercalating systems over the last several decades resulted in the design of hundreds of active material and electrolyte systems for practical battery applications. [1][2][3] Given the high priority of achieving maximum capacity, energy density, and rate capability characteristics of the Li-ion batteries, as well as emerging Na-ion and K-ion batteries, the focus of the majority of studies on the Electrochemical metal-ion intercalation systems are acknowledged to be a critical energy storage technology. The kinetics of the intercalation processes in transition-metal based oxides determine the practical characteristics of metal-ion batteries, such as the energy density, power, and cyclability. With the emergence of post lithium-ion batteries, such as sodium-ion and potassium-ion batteries, which function predominately in nonaqueous electrolytes of special formulation and exhibit quite varied material stability with regard to their surface chemistries and reactivity with electrolytes, the practical routes for the optimization of metal-ion battery performance become essential. Electrochemical methods offer a variety of means to quantitatively study the diffusional, charge transfer, and phase transformation rates in complex systems, which are, however, rather rarely fully adopted by the metal-ion battery community, which slows down the progress in rationalizing the ratecontrolling factors in complex intercalation systems. Herein, several practical approaches for diagnosing the origin of the rate limitations in intercalation materials based on phenomenological models are summarized, focusing on the specifics of charge transfer, diffusion, and nucleation phenomena in redox-active solid electrodes. It is demonstrated that information regarding rate-determining factors can be deduced from relatively simple analysis of experimental methods including cyclic voltammetry, chronoamperometry, and impedance spectroscopy.

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Section: Rate‐determining Steps In Ion Intercalation Processesmentioning

confidence: 99%

Metal‐Ion Coupled Electron Transfer Kinetics in Intercalation‐Based Transition Metal Oxides

Nikitina

Vassiliev

Stevenson

2020

Advanced Energy Materials

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“…2 Electrolytes, as their main component, play an essential role in the critical properties of lithium-ion batteries (LIBs) and lithium-metal batteries (LMBs), such as safety, cycle-life, and power density. 3,4 Designing application-oriented electrolytes have become an efficient way to enhance the performance and the safety of LIBs and LMBs. 5,6 The oxidation stability and the reductive inertness are two essential criteria to design electrolytes for improving the efficiency of a battery system.…”

Section: Introductionmentioning

confidence: 99%

“…Even the most commonly used carbonate-based solvents, such as ethylene-or propylene carbonate (EC and PC), and their derivatives, their disparity in forming SEI on the graphitic anode of LIBs from electron-level is still not elucidated. 4,16,17 The efforts of developing new electrolytes need more investigations focusing on the mechanisms, to reduce the consumption of resources originating from semi-empirical trial-and-error. Although Borodin et al [18][19][20] investigated the electrochemical properties of many electrolytes/solvents, direct and comprehensive EC and PC studies are rare.…”

Section: Introductionmentioning

confidence: 99%

Exploring the redox decomposition of ethylene carbonate–propylene carbonate in Li-ion batteries

Zhang

Yang

et al. 2021

Mater. Adv.

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“…[ 63 ] To overcome this issue, SEI‐forming additives, such as VC, can be introduced into electrolytes to facilitate the formation of a protective SEI layer on the Li anode. [ 64 ] The electrolyte composed of 10 m LiFSI in AN:VC (10:1 by volume) possessed a high oxidative stability of 5.5 V, and the Coulombic efficiency reached more than 99.2% when applied in a Li||Cu cell. [ 65 ] A smooth and compact Li deposition was detected, confirming the synergetic optimization effect of high salt concentration and SEI‐forming additive.…”

Section: Non‐flammable Organic Liquid Electrolytesmentioning

confidence: 99%

Non‐Flammable Liquid and Quasi‐Solid Electrolytes toward Highly‐Safe Alkali Metal‐Based Batteries

Jaumaux

Shanmukaraj

et al. 2020

Adv Funct Materials

174

133

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Rechargeable alkali metal (i.e., lithium, sodium, potassium)‐based batteries are considered as vital energy storage technologies in modern society. However, the traditional liquid electrolytes applied in alkali metal‐based batteries mainly consist of thermally unstable salts and highly flammable organic solvents, which trigger numerous accidents related to fire, explosion, and leakage of toxic chemicals. Therefore, exploring non‐flammable electrolytes is of paramount importance for achieving safe batteries. Although replacing traditional liquid electrolytes with all‐solid‐state electrolytes is the ultimate way to solve the above safety issues, developing non‐flammable liquid electrolytes can more directly fulfill the current needs considering the low ionic conductivities and inferior interfacial properties of existing all‐solid‐state electrolytes. Moreover, the electrolyte leakage concern can be further resolved by gelling non‐flammable liquid electrolytes to obtain quasi‐solid electrolytes. Herein, a comprehensive review of the latest progress in emerging non‐flammable liquid electrolytes, including non‐flammable organic liquid electrolytes, aqueous electrolytes, and deep eutectic solvent‐based electrolytes is provided, and systematically introduce their flame‐retardant mechanisms and electrochemical behaviors in alkali metal‐based batteries. Then, the gelation techniques for preparing quasi‐solid electrolytes are also summarized. Finally, the remaining challenges and future perspectives are presented. It is anticipated that this review will promote a safety improvement of alkali metal‐based batteries.

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How electrolyte additives work in Li-ion batteries

Cited by 99 publications

References 43 publications

Metal‐Ion Coupled Electron Transfer Kinetics in Intercalation‐Based Transition Metal Oxides

Metal‐Ion Coupled Electron Transfer Kinetics in Intercalation‐Based Transition Metal Oxides

Exploring the redox decomposition of ethylene carbonate–propylene carbonate in Li-ion batteries

Non‐Flammable Liquid and Quasi‐Solid Electrolytes toward Highly‐Safe Alkali Metal‐Based Batteries

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