Positive pole composite system of lithium sulphur battery containing catalytic additive

A lithium-sulfur battery and additive technology, applied in the field of electrochemistry, can solve problems such as unfavorable large-scale production and commercial application, complex preparation process of special structure carbon materials or conductive polymers, and structural damage.

Inactive Publication Date: 2013-02-27
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

This research method has achieved certain results, but its main disadvantage is that the preparation process of special structural carbon materials or conductive polymers is complicated, which is not conducive to large-scale production and commercial application, and due to the existence of volume effect, the cycle performance of batteries needs to be further improved
[0006] Young-Jin uses sputtering to coat the surface of sulfur particles with a carbon layer. The first discharge specific capacity of the composite material is 1178mAh / g. However, after 50 cycles of the battery, the discharge specific capacity is less than half of the original capacity, which is only 500mAh / g. The reason is that the structure is destroyed by the volume effect during the battery cycle (Y.J.Choi, Y.D.Chuang, C.Y.Baek, K.W.Kim, J.H.Ahn.Journal of Power Sources (Energy Magazine), 184:548-552)
[0007] J.Wang et al. aggregated a layer of polypyrrole on the surface of sulfur particles to form a core-shell structure of polypyrrole and sulfur. The first discharge specific capacity of the composite electrode reached 1280mAh / g, but the discharge specific capacity of the battery after 20 cycles was only 600mAh / g. , the capacity retention rate is less than 50% (J.Wang, J.Chen, K.konstantinov, L.Zhao, S.H.Ng, G.X.Wang, Z.P.Guo, H.K.Liu. Electrochimica Acta, 51:4634-4638)
[0008] In summary, the art lacks a technical solution to improve the conductivity of positive electrode materials and suppress the shuttle effect

Method used

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  • Positive pole composite system of lithium sulphur battery containing catalytic additive
  • Positive pole composite system of lithium sulphur battery containing catalytic additive
  • Positive pole composite system of lithium sulphur battery containing catalytic additive

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preparation example Construction

[0077] The present invention also provides a method for preparing the positive electrode, which includes the following steps:

[0078] Add the required active substances, inorganic nano-additives, and conductive agents into the solvent, and obtain a uniform dispersion through treatment;

[0079] The dispersion liquid is heated and evaporated to dryness in a water bath to obtain a uniformly dispersed solid powder material.

[0080] In a preferred embodiment, the solvent is selected from the group consisting of water, ethanol, acetone, butanone, carbon disulfide, carbon tetrachloride, benzene, toluene, xylene, and NMP.

[0081] When preparing the positive electrode, put an appropriate amount of electrode material in a solvent, stir evenly to form a slurry, coat it on the current collector electrode such as aluminum foil, dry, roll and cut to obtain the positive electrode sheet of the lithium-sulfur battery. Preferably, the positive electrode slurry has a solid content of 0.01g / ...

Embodiment approach

[0095] The present invention designs an inorganic nano-compound with catalytic activity as a sulfur positive electrode additive. The inorganic nano-additive has a catalytic effect on the lithium-sulfur battery reaction, reduces the activation energy of the reaction, and improves the reversibility of the battery reaction. Therefore, the coulombic efficiency of the battery can be improved, and the discharge ratio of the battery can be improved. capacity and battery cycle performance. At the same time, additives can be adsorbed on sulfur and polysulfides generated in the battery reaction, which can improve the dispersion of sulfur and inhibit the shuttle effect; oxide additives can increase the specific surface area and pore volume of the electrode, improve the contact between the electrode and the electrolyte, and reduce Battery resistance; In short, oxide additives can significantly improve battery performance and prolong battery life.

[0096] The disadvantages of low sulfur u...

Embodiment 1

[0115] Co 3 o 4 As an additive, it is added to the positive electrode of lithium-sulfur battery by ultrasonic mixing method to obtain the following figure 1 The microstructure shown, Co 3 o 4 adsorbed on the surface of S. The additive content is 10%, the positive electrode active material is sulfur, the content is 25%, acetylene black is the conductive agent, the content is 45%, and 20% polyvinylidene fluoride solution (solvent is N-methylpyrrolidone) is used as the bond The positive electrode slurry was prepared by using the same agent, and then the slurry was uniformly coated on the aluminum foil, and dried to obtain the electrode film.

[0116] Cut the obtained electrode membrane into 14mm discs directly, use metal lithium as the negative electrode, Celgard membrane as the separator, and the electrolyte as 1MLiTFSI (lithium bistrifluoromethanesulfonimide) DOL (1,3-dioxolane ring) / TEGDME(1 / 1, v / v). The assembly of the entire battery is done in a glove box.

[0117] Ad...

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Abstract

The invention provides a positive pole additive of a sulfur electrode, wherein the additive is an inorganic nanometer material with high specific surface area, and the size of a nanometer granule is 2-800 nanometers. The invention also provides a positive pole containing the positive pole additive and a battery. The positive pole additive and the obtained electric pole and battery which are provided by the invention have the advantages of high positive pole material conductivity and shuttle inhibition effect.

Description

technical field [0001] The invention relates to a sulfur positive pole piece containing additives and a lithium-sulfur battery composed of the same, belonging to the technical field of electrochemistry. Background technique [0002] At present, electrochemical energy storage and conversion devices are more and more widely used in daily life, such as mobile phones, computers, electric vehicles, and other portable electronic products and electrochemical energy storage. Among them, lithium batteries have received widespread attention due to their high specific energy, and have occupied most of the market in small portable electronic devices. With the development of economy and society, people put forward urgent expectations for next-generation lithium batteries with high specific energy, long service life, high safety and low cost. [0003] Among all lithium batteries, lithium-sulfur batteries with chalcogenide materials as the positive electrode have attracted a lot of resear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/139H01M10/052
CPCY02E60/122Y02E60/10
Inventor 温兆银马国强靳俊崔言明张敬超吴相伟吴梅芬彭鹏
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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