用于锂硫电池的正电极

Positive electrodes for lithium-sulphur batteries

Abstract

本发明涉及一种形成电极用组合物[组合物(C)],该组合物包含:(a)水性乳胶,该水性乳胶包含至少一种包含衍生自偏二氟乙烯(VDF)、至少一种氢化单体[单体(H)]、以及任选地至少一种不同于VDF的其他氟化单体[单体(F)]的重复单元的氟聚合物[聚合物(F)],并且,均匀地分散其中,(b)至少一种由硫组成的粉末状形成电极用材料[材料(E)],(c)至少一种粉末状导电材料[材料(C)],(d)任选地,至少一种表面活性剂[表面活性剂(S)],(e)任选地,至少一种粘合剂[试剂(B)],以及(f)任选地,基于该组合物(C)的总重量按重量计低于10%的至少一种有机溶剂[溶剂(S)],其中该水性乳胶中的聚合物(F)是呈具有如根据ISO 13321测量的平均初级颗粒尺寸小于1μm的初级颗粒的形式。本发明还涉及一种用于制造所述组合物(C)的方法,以及所述组合物(C)在用于制造锂硫电池用正电极的方法中的用途。
The present invention pertains to an electrode-fornning composition [composition (C)] comprising: (a) an aqueous latex comprising at least one fluoropolymer [polymer (F)] comprising recurring units derived from vinylidene fluoride (VDF), at least one hydrogenated monomer [monomer (H)] and, optionally, at least one other fluorinated monomer [monomer (F)] different from VDF, and, homogeneously dispersed therein, (b) at least one powdery electrode-forming material consisting of Sulphur [material (E)], (c) at least one powdery electrically conducting material [material (C)], (d) optionally, at least one surfactant [surfactant (S)], (e) optionally, at least one binding agent [agent (B)], and (f) optionally, less than 10% by weight, based on the total weight of the composition (C), of at least one organic solvent [solvent (S)], wherein the polymer (F) in the aqueous latex is under the form of primary particles having an average primary particle size of less than 1 um, as measured according to ISO 13321. The present invention also pertains to a process for the manufacture of said composition (C) and to use of said composition (C) in a process for the manufacture of a positive electrode for a Lithium-Sulphur battery.

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