Electrolytes for improved performance of cells with high-capacity anodes based on micron-scale moderate volume-changing particles
摘要
說(shuō)明書
In some designs (e.g., in cells with Si-comprising anodes), it may be preferable for electrolyte to comprise a combination of 30-70 vol. % (e.g., around 50 vol. %) of ester(s) (in some case, with the majority of all esters exhibiting a formula C5H10O2) with 15-30 vol. % (e.g., around 20 vol. %) of cyclic carbonates (e.g., PC), 15-30 vol. % (e.g., around 20 vol. %) of linear carbonates (e.g., a mixture of EMC and DMC) and 5-20 vol. % (e.g., around 5 or around 7 vol. %) of a fluorinated solvent (e.g., FEC). The vol. % is given as a percentage of all the solvents in the electrolyte. In some designs, such an electrolyte may preferably comprise a combination of two or more (in some designs, three or more) salts with the total concentration preferably in excess of 1.2 M and below 2.0 M. In one illustrative example, such a combination may be 1 M LiPF6, 0.2 M LiFSI, and 0.1 M LiBOB. In another illustrative example, such a combination may be 1.1 M LiPF6, 0.1 M LiFSI, and 0.1 M LiBOB. In yet another illustrative example, such a combination may be 1.2 M LiPF6, 0.2 M LiFSI, and 0.1 M LiBOB.
