Table 2.

Composite polymer electrolytes with different fillers

Filler	System	Conductivity [S cm−1]	Transference number	Ref.
Al2O3	PEO/LiClO4	1 × 10−5 @30 °C (Initial: 10−6)	0.31 (Initial: 0.16)	[95]
Gd0.1Ce0.9O1.95/La0.8Ga0.8Mg0.2O2.55 (full with oxygen vacancies)	PEO/LiTFSI	1.9 × 10−4 @30 °C (Initial: 10−6)	0.26 (Initial: 0.13)	[94b]
Nanosized Al2O3 with oxygen vacancies	PEO/LiTFSI	3.81 × 10 −4 @70 °C (Initial: 10−5)	0.27 (Initial: 0.27)	[96]
Monodispersed SiO2	PEO/LiClO4	4.4 × 10 − 5 @30 °C (Initial: ≈3 × 10−7)	—	[88]
Palygorskite nanowires ((Mg,Al)2Si4O10(OH))	PVDF/LiClO4	1.2 × 10−4 @40 °C	0.54 (Initial: 0.54)	[75]
AlF3‐modified anodized aluminum oxide	PEO/LiTFSI	5.82 × 10−4 @30 °C (Initial: 3 × 10−7)	—	[16b]
Y2O3‐doped ZrO2 nanowires (Highly concentrated oxygen vacancies)	PAN/LiClO4	1.07 × 10−5 @30 °C (Initial: 2.1 × 10−7)	0.56 (Initial: 0.56)	[89]
Mg2B2O5 nanowires	PEO/LiTFSI	1.53 × 10−4 @40 °C (Initial: ≈1 × 10−5)	0.44 (Initial: 0.44)	[97]
Ta‐doped LLZO	PVDF/LiClO4	5 × 10−4 @25 °C (Initial: ≈7 × 10−5)	—	[94a]