Energy storage devices with polymer electrolytes and fillers

An energy storage device comprising:

• a first electrode;
• a second electrode, wherein the second electrode is a Si-dominant anode having greater than 50% silicon;
• and
• a blend-based membrane between the first electrode and the second electrode, wherein the blend-based membrane comprises two or more polymer electrolytes;
• lithium bis(trifluoromethanesulfonyl)imide (LiTFSI);
• and
• at least one filler;
• and further wherein the blend-based membrane is selected from the group consisting of:
• PEO/PMVMA/cyclodextrin (CD), PEO/PMVMA/polyacrylamide (PAM), PEO/PMVMA/polysaccharide-based biopolymer, PEO/PMVMA/polyurethane (PU), PEO/PMVMA/R—OH, PEO/PAA/CD, PEO/PAA/PAM, PEO/PAA/polysaccharide-based biopolymer, PEO/PAA/R—OH, PEO/Alginate/PVA, PEO/Alginate/CD, PEO/Alginate/PAM, PEO/Alginate/polysaccharide-based biopolymer, PEO/Alginate/PU, PEO/Alginate/R—OH, PEO/R—COOH/R′—OH, poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)/PMVMA/PVA, PVDF-HFP/PMVMA/CD, PVDF-HFP/PMVMA/PAM, PVDF-HFP/PMVMA/polysaccharide-based biopolymer, PVDF-HFP/PMVMA/PU, PVDF-HFP/PMVMA/R—OH, PVDF-HFP/PAA/PVA, PVDF-HFP/PAA/CD, PVDF-HFP/PAA/PAM, PVDF-HFP/PAA/polysaccharide-based biopolymer, PVDF-HFP/PAA/R—OH, PVDF-HFP/Alginate/PVA, PVDF-HFP/Alginate/CD, PVDF-HFP/Alginate/PAM, PVDF-HFP/Alginate/polysaccharide-based biopolymer, PVDF-HFP/Alginate/PU, PVDF-HFP/Alginate/R—OH, PVDF-HFP/R—COOH/R′—OH, polyacrlonitrle (PAN)/PMVMA/PVA, PAN/PMVMA/CD, PAN/PMVMA/PAM, PAN/PMVMA/polysaccharide-based biopolymer, PAN/PMVMA/PU, PAN/PMVMA/R—OH, PAN/PAA/PVA, PAN/PAA/CD, PAN/PAA/PAM, PAN/PAA/polysaccharide-based biopolymer, PAN/PAA/R—OH, PAN/Alginate/PVA, PAN/Alginate/CD, PAN/Alginate/PAM, PAN/Alginate/polysaccharide-based biopolymer, PAN/Alginate/PU, PAN/Alginate/R—OH, PAN/R—COOH/R′—OH, poly(methyl methacrylate) (PMMA)/PMVMA/PVA, PMMA/PMVMA/CD, PMMA/PMVMA/PAM, PMMA/PMVMA/polysaccharide-based biopolymer, PMMA/PMVMA/PU, PMMA/PMVMA/R—OH, PMMA/PAA/PVA, PMMA/PAA/CD, PMMA/PAA/PAM, PMMA/PAA/polysaccharide-based biopolymer, PMMA/PAA/R—OH, PMMA/Alginate/PVA, PMMA/Alginate/CD, PMMA/Alginate/PAM, PMMA/Alginate/polysaccharide-based biopolymer, PMMA/Alginate/PU, PMMA/Alginate/R—OH, and PMMA/R—COOH/R′—OH;
• wherein said first electrode is a cathode selected from the group consisting of:
• a Ni-rich Li[NixCoyMn(Al)1−x−y]O2 cathode;
• a Ni-rich lithium nickel cobalt manganese oxide LiNiCoMnO2 (NMC) cathode, a Ni-rich lithium nickel cobalt aluminum oxide LiNiCoAlO2 (NCA) cathode, a LiCoO2 cathode, a lithium rich, xLi2Mn3·(1−x)LiNiaCobMncO2 cathode, a nickel-rich layered cobalt oxide (LiNi1−xCoxO2) cathode, a nickel-rich layered manganese oxide (LiNi1−xMnxO2) cathode, a nickel-rich layered aluminum oxide (LiNi1−xAlxO2) cathode, a lithium rich layered cobalt oxide (LiNi1+xCo1−xO2) cathode, a lithium rich layered manganese oxide (LiNi1+xMn1−xO2) cathode, a lithium rich layered nickel oxide (LiNi2O2) cathode, a high-voltage spinel oxide (LiNi0.5Mn1.5O4) cathode, a high-voltage phosphate cathode, a high-voltage sulfate cathode, and a high-voltage silicate cathode;
• and
• wherein the silicon in the second electrode is present as silicon particles.