Adiponitrile-based electrolytes for high voltage, graphite-based Li-ion battery

JOURNAL OF POWER SOURCES

卷:397

Article

Ehteshami, Niloofar¹  Eguia-Barrio, Aitor²  de Meatza, Iratxe²  Porcher, Willy³  Paillard, Elie¹ 

[1] Forschungszentrum Julich IEK12, Helmholtz Inst Munster, Correnstr 80, D-48149 Munster, Germany

[2] IK4 CIDETEC, Parque Tecnol San Sebastian,Paseo Miramon 196, Donostia San Sebastian 20014, Spain

[3] CEA LITEN, 17 Ave Martyrs, F-38000 Grenoble, France

关键词: Adiponitrile;    Graphite;    Additive;    LiFSI;    LiDFOB;    Lithium-ion;   

DOI  :  10.1016/j.jpowsour.2018.07.004

来源: Elsevier

【 摘 要 】

Operating high voltage lithium-ion batteries (LIB) is still an obstacle due to the limited anodic stability of state-of-the-art alkyl carbonates-based electrolytes which incorporate ethylene carbonate (EC). Thus, we replace here the widely used ethylene carbonate (EC)/dimethyl carbonate (DMC) solvent formulation by adiponitrile (ADN)/ DMC (1/1, wt./wt.), to enable room temperature electrolyte formulations with high anodic stabilities. The possibility of operating graphite with 1 M LiDFOB & 1 M LiFSI ADN/DMC (1/1, wt./wt.) without additive is evidenced, with a clear advantage for the LiDFOB electrolyte. The addition of fluoroethylene carbonate (FEC) as a SEI additive results in improved graphite electrode performance in both cases and, less expectedly, in improved anodic stabilities. Cathodes operating above 4.3 V vs Li+/Li have been paired with graphite as well and allowed improved rate capability as compared to graphite half-cells. The safety of the electrolytes versus a charged graphite anode is improved as compared with state-of-the-art, EC-based electrolytes.

【 授权许可】

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