Nonaqueous Liquid Electrolytes for Lithium-Based Rechargeable Batteries

Lithium metal batteries (LMBs) are among the most promising candidates of high‐energy‐density devices for advanced energy storage. However, the growth of dendrites greatly hinders the practical applications of LMBs in portable electronics and electric vehicles. Constructing stable and efficient solid electrolyte interphase (SEI) is among the most effective strategies to inhibit the dendrite growth and thus to achieve a superior cycling performance. In this review, the mechanisms of SEI formation and models of SEI structure are briefly summarized. The analysis methods to probe the surface chemistry, surface morphology, electrochemical property, dynamic characteristics of SEI layer are emphasized. The critical factors affecting the SEI formation, such as electrolyte component, temperature, current density, are comprehensively debated. The efficient methods to modify SEI layer with the introduction of new electrolyte system and additives, ex‐situ‐formed protective layer, as well as electrode design, are summarized. Although these works afford new insights into SEI research, robust and precise routes for SEI modification with well‐designed structure, as well as understanding of the connection between structure and electrochemical performance, is still inadequate. A multidisciplinary approach is highly required to enable the formation of robust SEI for highly efficient energy storage systems.

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“…The present electrolyte systems in LMBs mostly contain solvents and Li salts 16, 17, 18. The common solvents are esters (e.g.…”

Section: Mechanism Of Sei Formationmentioning

confidence: 99%

A Review of Solid Electrolyte Interphases on Lithium Metal Anode

et al. 2015

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“…(iii) Improvement of safety, in addition to suppression of lithium dendrites, the quasi-solid-state construction of a polymer electrolyte is more tolerant to mechanical deformation. (iv) Better shape flexibility and manufacturing integrity [10][11][12][13][14][15][16][17]. Meanwhile, to be successfully used in practice, GPE must meet the following basic requirements: (i) ionic conductivity higher than~10 −4 S cm −1 at room temperature, (ii) lithium ion transference number close to unity, (iii) good thermal, chemical and electrochemical stability and (iv) a considerable mechanical strength [10,12,[18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…Lithium hexafluorophosphate (LiPF 6 ) is predominant lithium salt in liquid electrolyte system [9,10]. However, LiPF 6 is known to be extremely sensitive to moisture and thermally decompose at about 60°C.…”

Section: Introductionmentioning

confidence: 99%

A single-ion gel polymer electrolyte based on polymeric lithium tartaric acid borate and its superior battery performance

et al. 2014

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A single-ion gel polymer electrolyte of PLTB@PVDF-HFP (polymeric lithium tartaric acid borate@poly(vinylidene fluoride-co-hexafluoropropene)) was prepared and its ionic conductivity was optimized via solvent composition tailoring. It was manifested that the ethylene carbonate/dimethyl carbonate (EC/DMC) swollen PLTB@PVDF-HFP exhibited a superior lithium ionic conductivity at room temperature to that of the traditional liquid electrolyte system (1 M LiPF 6 /EC/DMC). The Li 4 Ti 5 O 12 /LiFePO 4 cells using the EC/DMC swollen PLTB@PVDF-HFP as polymer electrolyte showed stable charge/discharge voltage profiles with small voltage hysteresis, preferable rate capability and excellent cycle performance at room temperature. These superior performances of EC/DMC swollen PLTB@ PVDF-HFP could endow this class of gel polymer electrolyte a very promising alternative to state of the art liquid electrolyte system.

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“…Interfaces at battery electrodes have been studied for a long time; however, they are not fully understood yet. For instance, the so‐called solid electrolyte interface (SEI) formed at the negative electrode of common Li‐ion batteries has attracted a special attention since it drastically influences the key parameters in the performance of a battery, e.g., cycle‐life and safety 6, 7. This SEI is probably the most important and the least understood element in rechargeable Li‐ion batteries 8.…”

mentioning

confidence: 99%