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Positive electrode material of lithium sulfur battery and preparation method and application of material

A sulfur cathode material, a technology for lithium-sulfur batteries, applied in battery electrodes, lithium batteries, positive electrodes, etc., can solve problems such as low load, damage to electrode structure, and loss of electrode capacity from active materials

Active Publication Date: 2014-04-16
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor stability of sulfur, during the discharge process, due to the generation of polysulfides and their dissolution in the electrolyte, a large amount of active material will be lost and the electrode capacity will be rapidly attenuated.
In addition, these polysulfides will also deposit and agglomerate on the surface of the positive and negative electrodes, destroying the electrode structure, and even leading to battery failure in severe cases.
[0003] In order to improve the dissolution of polysulfides, the most commonly used method at present is to carry out carbon coating or polymer coating on the sulfur element. This method can prevent the dissolution of polysulfides well, but it is difficult for the final active substance, that is, the loading of sulfur. The amount is usually relatively low, resulting in a large difference between the actual electrode capacity and the theoretical capacity
In addition, this physical packaging method also has a defect that it is easy to limit the rapid charge and discharge of the active substance sulfur.

Method used

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  • Positive electrode material of lithium sulfur battery and preparation method and application of material
  • Positive electrode material of lithium sulfur battery and preparation method and application of material
  • Positive electrode material of lithium sulfur battery and preparation method and application of material

Examples

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preparation example Construction

[0076] The sulfur cathode material of the present invention can be prepared by conventional methods in the art, and a preferred preparation method includes the following steps:

[0077] (a) mixing nanomaterials of the present invention, elemental sulfur, conductive carbon black, binder and solvent to obtain slurry;

[0078] (b) coating the obtained slurry on a conductive current collector to obtain the sulfur cathode material of the present invention.

[0079] Preferably, in step (b), the conductive current collector coated with the slurry is dried under vacuum for 1-24 hours at a drying temperature of 20-80°C (preferably 40-60°C).

[0080] Wherein, the conductive current collector includes aluminum film, nickel film, etc., and the solvent can be selected from organic solvent or water, preferably N-methylpyrrolidone (NMP).

[0081] The above-mentioned features mentioned in the present invention, or the features mentioned in the embodiments can be combined arbitrarily. All th...

Embodiment 1

[0094] Example 1: Porous Fe 2 o 3 Preparation and structure characterization of nanoparticles

[0095] Weigh 3.8 grams of PVP, dissolve 0.11 grams of potassium ferrocyanide in 50 ml of 0.1 molar hydrochloric acid solution, and dissolve all solids by magnetic stirring. The obtained solution was placed in an oil bath at 80° C. for 12 h to obtain a precipitate. The precipitate was centrifuged at 9000 rpm to obtain the product, which was washed three times with distilled water and ethanol respectively and centrifuged to obtain solid particles. The resulting solid particles were vacuum dried at room temperature and then calcined at 500 °C to obtain porous Fe 2 o 3 nanoparticles.

[0096] Porous Fe prepared in this example 2 o 3 Nanoparticles were analyzed by SEM structure, and the test results were as follows: figure 1 shown, from figure 1 It can be seen that the prepared porous Fe 2 o 3 The size distribution of nanoparticles is uniform, between 300-500nm. figure 2 wit...

Embodiment 2

[0097] Example 2: Porous Fe 2 o 3 Preparation of nanoparticles and their structural characterization (as a comparative example, the temperature is 550°C)

[0098] Porous Fe in this embodiment 2 o 3 The preparation of nanoparticles is basically the same as in Example 1, except that the calcination temperature is 550°C.

[0099]The specific steps are as follows: Weigh 3.8 grams of PVP, dissolve 0.11 grams of potassium ferrocyanide in 50 ml of 0.1 molar hydrochloric acid solution, and dissolve all solids by magnetic stirring. The obtained solution was placed in an oil bath at 80° C. for 12 h to obtain a precipitate. The precipitate was centrifuged at 9000 rpm to obtain the product, which was washed three times with distilled water and ethanol respectively and centrifuged to obtain solid particles. The obtained solid particles were vacuum-dried at room temperature and then calcined at 550 °C to obtain porous Fe 2 o 3 nanoparticles. The pore size of the particles is 20-40 n...

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Abstract

The invention relates to a positive electrode material of a lithium sulfur battery and a preparation method and application of the material and in particular discloses a nanometer material. The material has the following characteristics: (i) the material refers to Fe2O3 nano-particles; (ii) the nano-particles are in a cube shape and have the size of 300-500nm; (iii) the material is in a porous structure, and the pore size distribution of the particles is in the range of 1-10nm. According to the nanometer material, polysulfide produced by the sulfur positive electrode material in a discharging process can be effectively stored, loss caused by dissolution of the polysulfide is avoided, and the capacity and cycling stability of the battery are obviously improved. In addition, the invention also discloses a preparation method and application of the nanometer material.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a positive electrode material for a lithium-sulfur battery and a preparation method and application thereof. Background technique [0002] With the society's increasing demand for energy and the depletion of petroleum fuels, people's demand for new alternative energy is becoming more and more urgent. Due to its energy density, it is difficult for traditional lithium-ion batteries to break through 300Wh / kg, which limits their large-scale application in the field of pure electric vehicles. The theoretical specific capacity of elemental sulfur can also reach 1680mAh / g, and the theoretical specific capacity of a lithium-sulfur battery formed with lithium can be as high as 2600Wh / kg. At the same time, because sulfur is rich in reserves, cheap, and has no pollution to the environment, it is a new type of secondary battery with great application prospects. However, due to the poor sta...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M10/0525C01G49/06B82Y30/00
CPCY02E60/122B82Y30/00C01G49/06H01M4/364H01M4/52H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 沈彩赵冲冲韩伟强
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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