All-solid-state polymer electrolyte used for lithium-sulfur secondary battery and its preparation method
An all-solid-state polymer and sulfur secondary battery technology, applied in secondary batteries, battery components, circuits, etc., can solve short circuit, poor utilization rate of positive electrode active material and cycle stability, and limited application of lithium-sulfur batteries and other issues, to achieve the effect of reducing cost, not demanding operation and environment requirements, and reducing production process
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[0033] The preparation method of the all-solid polymer electrolyte of the present invention comprises the following steps:
[0034] (1) Mix and stir lithium salt and organic solvent evenly, then add polyethylene oxide (PEO) powder into the above mixture and continue to stir until uniform, wherein the molar ratio of lithium salt to EO group in PEO is 1:2~ 32, preferably 1:6-20, more preferably 1:8-16; the mass ratio of PEO to solvent is 1:10-100, preferably 1:20-90, more preferably 1:20-50.
[0035] (2) will Li 4 Ti 5 o 12 Particles are mixed with organic solvents, where Li 4 Ti 5 o 12 The particle size is 0.05-0.5um (preferably 0.05-0.5um, more preferably 0.05-0.1um) and the mass ratio of PEO is 0.01-0.25:1 (preferably 0.05-0.20:1, more preferably 0.1-0.15:1), ultrasonic After oscillating for 30-60 minutes, stir at a speed of 200-500 r / min until uniform, and let stand for 5-10 minutes.
[0036] (3) The mixture of step (1) and step (2) is mixed and stirred until uniform,...
Embodiment 1
[0042] The all-solid polymer electrolyte of this embodiment consists of LiCF 3 SO 3 , polyethylene oxide (PEO) and Li 4 Ti 5 o 12 Particle composition, where LiCF 3 SO 3 The molar ratio to the EO group of polyethylene oxide is 1:16, Li 4 Ti 5 o 12 The mass ratio of particles to PEO is 0.1:1.
[0043] The electrical conductivity of the all-solid polymer electrolyte is measured by an AC impedance method, the frequency range of the test is 1-100 kHz, and the amplitude is 10 mV. The conductivity of the all-solid polymer electrolyte δ=L / (S×R), L is the thickness of the all-solid polymer electrolyte, S is the area of the all-solid polymer electrolyte, R is the bulk resistance of the all-solid polymer electrolyte, after testing The conductivity of the all-solid polymer electrolyte at 80°C is 2.5×10 -3 S / cm.
[0044] The all-solid polymer electrolyte invented in this embodiment can be applied in the preparation of lithium-sulfur batteries. -P, 10% LA132), all-solid polym...
Embodiment 2
[0046] The all-solid polymer electrolyte of the present embodiment is made of LiTFSI, polyethylene oxide (PEO) and Li 4 Ti 5 o 12 Particle composition, in which the molar ratio of LiTFSI to EO groups of polyethylene oxide is 1:6, Li 4 Ti 5 o 12 The mass ratio of particles to PEO was 0.05:1. The conductivity of the all-solid polymer electrolyte at 90°C was tested to be 3.2×10 -3 S / cm.
[0047] The all-solid polymer electrolyte invented in this embodiment can be applied in the preparation of lithium-sulfur batteries. -P, 10% LA132), all-solid polymer electrolyte and negative electrode material metal lithium to form a 2032 all-solid button battery, charge and discharge at 90°C and 50mA / g, the first discharge capacity is 1596.4mAh / g, and the utilization rate of sulfur is 95.5%, and the discharge specific capacity after 50 cycles is 982.1mAh / g.
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