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Self-assembly polyimide porous material, preparation method thereof and application thereof in lithium sulfur battery

A technology of polyimide and porous materials, which is applied in the fields of polyimide particles, porous carbon precursors, and positive electrode carbon materials. It can solve the problems of positive electrode structure collapse, capacity drop, and poor conductors, and achieve mild reaction conditions Reduce contact resistance and facilitate charging and discharging

Inactive Publication Date: 2017-08-01
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the following problems hinder the commercialization of lithium-sulfur batteries: 1. Sulfur and the discharge product lithium sulfide (Li 2 S) is a poor conductor of electrons
2. About 80% volume change will occur during charging and discharging, which will likely lead to the collapse of the positive electrode structure
3. The "shuttle effect" of the intermediate product polysulfide will reduce the utilization rate of the active material, resulting in a lower Coulombic efficiency of the battery and a faster decline in capacity
However, the post-processing of the existing carbon materials synthesized by the template method is cumbersome; the carbon materials synthesized by the self-assembly method are mostly two kinds of solvents, and there are many influencing factors

Method used

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  • Self-assembly polyimide porous material, preparation method thereof and application thereof in lithium sulfur battery
  • Self-assembly polyimide porous material, preparation method thereof and application thereof in lithium sulfur battery
  • Self-assembly polyimide porous material, preparation method thereof and application thereof in lithium sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] At room temperature, add 0.200g of 4,4-diaminodiphenyl ether (ODA) and PVB of equal mass to 6.5ml of DMF solution, stir vigorously to disperse evenly, add 0.266g of 1,4,5,8- Naphthalene tetracarboxylic anhydride, stirred at room temperature for 10 hours.

[0031] Transfer the above solution into a polytetrafluoroethylene liner, put the reaction kettle in an oven, react at 180°C for 10h, cool to room temperature, filter, wash, and dry to obtain porous polyamic acid particles.

[0032] The obtained polyimide acid particles were placed in a tube furnace under N 2 Under the atmosphere, the temperature was raised to 400°C at 3°C / min and maintained for 1h to obtain polyimide particles; the temperature was continued to be raised to 900°C at 3°C / min and maintained for 1h to obtain porous carbon spheres.

[0033] Dissolve 0.19g of elemental sulfur in 40ml of toluene, weigh 0.08g of the above-mentioned carbon material, mix the sulfur toluene solution with the carbon material, st...

Embodiment 2

[0040] At room temperature, add 0.4234g of 4,4-diaminodiphenyl ether (ODA) and equal mass of PVB to 13.2ml of DMF solution, stir vigorously to disperse evenly, add 0.6460g of 1,4,5,8-naphthalene tetrachloride in batches Formic anhydride, stirred at room temperature for 9 hours.

[0041] Transfer the above solution into a polytetrafluoroethylene liner, place the reaction kettle in an oven, react at 180°C for 10h, cool to room temperature, filter, wash, and dry to obtain porous polyamic acid particles.

[0042] Place the obtained polyimide acid particles in a tube furnace, raise the temperature to 350°C at 3°C / min under N2 atmosphere, and keep it for 1h to obtain polyimide particles; continue to raise the temperature to 800°C at 3°C / min , maintained for 1h, to obtain porous carbon spheres.

[0043] Dissolve 0.3g of elemental sulfur in 60ml of toluene, weigh 0.3g of the above-mentioned carbon material, mix the toluene solution of sulfur with the carbon material, stir at room tempe...

Embodiment 3

[0050] At room temperature, add 0.445g of 4,4-diaminodiphenyl ether (ODA) and equal mass of PVB to 13ml of 1-methyl-2-pyrrolidone (NMP) solution, stir vigorously to disperse evenly, add 0.530g1 in batches ,4,5,8-Naphthalene tetracarboxylic anhydride was added to the above solution, stirred vigorously to disperse evenly, and stirred at room temperature for 10 hours.

[0051] Transfer the above solution into a polytetrafluoroethylene liner, place the reaction kettle in an oven, react at 180°C for 10h, cool to room temperature, filter, wash, and dry to obtain porous polyamic acid particles.

[0052] Place the obtained polyimide acid particles in a tube furnace, raise the temperature to 350°C at 3°C / min under N2 atmosphere, and maintain it for 1h to obtain polyimide particles; continue to raise the temperature to 900°C at 3°C / min , maintained for 3h, to obtain porous carbon spheres.

[0053] Dissolve 0.19g of elemental sulfur in 40ml of toluene, weigh 0.08g of the above-mentioned...

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Abstract

The invention discloses a self-assembly polyimide porous material, a preparation method thereof and application thereof in a lithium sulfur battery. The self-assembly polyimide porous material is obtained by taking aromatic dianhydride and diamine as raw materials, forming multi-layer poreous polyimide particles in a single organic solvent by self-assembly of molecules and performing high-temperature carbonization and sulfur washing, the polyimide porous material is formed by assembling polyimide sheet layers, the thickness of each sheet layer is 20-40 nanometers, and gaps of 50-200 nanometers exist among the sheet layers. The self-assembly polyimide porous material is used for preparing a lithium sulfur battery positive electrode material. The self-assembly polyimide porous material has the beneficial effect of moderate reaction condition and is simple to operate; the morphology of the self-assembly polyimide porous material can be controlled only by controlling reaction time and concentration of a reactant; the synthesized carbon material contains a nitrogen element and has a certain suppression effect on shuttling of a polysulfide of the lithium sulfur battery; and the self-assembly polyimide porous material is relatively large in size, the contact resistance can be reduced, and charging and discharging under large rate are facilitated.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur batteries, and in particular relates to a polyimide particle obtained by a self-assembly method, which is used as a precursor of porous carbon and used as a positive electrode carbon material of the lithium-sulfur battery. Background technique [0002] With the increase of people's demand for high-performance batteries, the existing lithium-ion secondary battery system, due to the limitation of the theoretical lithium storage capacity of traditional transition metal oxide-based cathode materials, has encountered a bottleneck in the improvement of lithium intercalation capacity. [0003] Compared with traditional lithium-ion batteries, lithium-sulfur batteries have become a new generation of secondary batteries due to their theoretical specific capacity of 1675mAh / g, theoretical specific energy of 2600Wh / Kg, abundant elemental sulfur in nature, low toxicity, and low price. potential army. [0004] Ho...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/62H01M4/628H01M10/052Y02E60/10
Inventor 张凤祥赵淑鹏马艳娇郭峻岭
Owner DALIAN UNIV OF TECH
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