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

Inactive Publication Date: 2012-06-13
RUISHENG NEW ENERGY DEV CHANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, due to the matching of liquid electrolysis or gel polymer electrolyte with metal lithium, metal lithium negative electrodes are prone to dendrites, breaking through the separator and short circuiting, and lithium-sulfur batteries using common electrolytes, the utilization of positive active materials The rate and cycle stability are poor, which limits the application of lithium-sulfur batteries

Method used

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  • All-solid-state polymer electrolyte used for lithium-sulfur secondary battery and its preparation method
  • All-solid-state polymer electrolyte used for lithium-sulfur secondary battery and its preparation method
  • All-solid-state polymer electrolyte used for lithium-sulfur secondary battery and its preparation method

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preparation example Construction

[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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Abstract

Belonging to the technical field of lithium-sulfur secondary battery preparation, the invention relates to an all-solid-state polymer electrolyte used for a lithium-sulfur secondary battery and its preparation method. Directed at the current situation that a metal lithium negative electrode is likely to generate a dendrite which can break a diaphragm so as to cause a short circuit when the liquid electrolyte or gel polymer electrolyte of a lithium-sulfur secondary battery matches with metal lithium, the invention provides an all-solid-state polymer electrolyte used for a lithium-sulfur secondary battery. The electrolyte comprises PEO (polyethylene oxide), a Li4Ti5O12 particle and a lithium salt, which can be LiClO4, LiPF6, LiBF4, LiCF3SO3 or LiTFSI. At a temperature of 30DEG C, the electrolyte has electric conductivity greater than 10<-4>S/cm, which is far higher than the electric conductivity of 10<-6>-10<-7>S/cm of PEO/a lithium salt at a temperature of 30DEG C. In a lithium-sulfur secondary battery, the electrolyte can serve both as an electrolyte and a diaphragm, and the double functions can substantially enhance the utilization rate and circulation stability of a positive active material.

Description

technical field [0001] The invention relates to an all-solid polymer electrolyte for a lithium-sulfur secondary battery and a preparation method and application thereof, belonging to the technical field of lithium-sulfur secondary battery manufacturing. Background technique [0002] Due to the advantages of small size, light weight and high specific energy, lithium-ion secondary batteries occupy a mainstream position in portable consumer electronics products, but the development of electric vehicles urgently requires the development of secondary batteries with higher specific energy, and lithium-sulfur Batteries have the advantages of high specific energy (theoretical specific energy is as high as 2600Wh / Kg), low cost and environmental friendliness, and are one of the ideal power sources for electric vehicles. However, the room temperature conductivity of elemental sulfur is only 5×10 -30 S / cm is close to electronic insulation; the cycle performance of sulfur electrodes is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M2/16H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 潘中来谭斌黄兴兰杨克润马先果李仁贵邓正华
Owner RUISHENG NEW ENERGY DEV CHANGZHOU
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