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Halogenated cyclic sulfite, and an electrolyte, lithium cell and lithium-sulfar cell

A cyclic sulfite, halogenated vinyl sulfite technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low discharge capacity, low cycle capacity, poor storage performance of lithium-sulfur batteries, etc. To achieve the effect of increasing the decomposition voltage

Inactive Publication Date: 2007-01-10
PEKING UNIV
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Problems solved by technology

At present, it is generally believed that the self-discharge reaction between positive electrode sulfur and metallic lithium in the electrolyte is an important reason for the poor storage performance, low discharge capacity and low cycle capacity of lithium-sulfur batteries.

Method used

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  • Halogenated cyclic sulfite, and an electrolyte, lithium cell and lithium-sulfar cell
  • Halogenated cyclic sulfite, and an electrolyte, lithium cell and lithium-sulfar cell
  • Halogenated cyclic sulfite, and an electrolyte, lithium cell and lithium-sulfar cell

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Experimental program
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Embodiment Construction

[0053] Synthesis of halogenated cyclic sulfites:

[0054] refer to figure 1 , taking 1-chloropropylene sulfite (ClPS) as an example:

[0055] 101.0 grams of triethylamine, 84.9 grams of dichloromethane and 110.5 grams of 3-chloro-1,2-propanediol are placed in a glass container with a volume of 1000 mL and mixed evenly, 119 grams of thionyl chloride and 84.9 grams of dichloromethane The mixture was added dropwise to the container, and the dropwise addition process continued for 3 hours while stirring the contents of the container. After the dropwise addition, the reaction system was heated to 65° C. and kept for 2 hours.

[0056] The reaction mixture was filtered under normal pressure, and the filtrate was distilled under normal pressure at 60°C until no distillate flowed out of the filtrate. After the above operations, the remaining liquid obtained was the crude product of 1-chloropropylene sulfite. The crude product was Dehydration was performed using a total reflux dehydr...

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Abstract

The invention provides a halogeno-cyclic-sulfite, which is halogenated compound of cyclic sulfite. The halogenated compound contains sulfurous-ethylene-ester,fluoride of sulfurous-propylene-ester, chloride, bromidum and iodide. The halogeno-cyclic-sulfite has a high decomposition voltage, which is put in the electrolyte of lithium batteries, then the decomposition voltage of the overall lithium can be improved, so that the practical application of lithium secondary batteries with high electrical potential can be realized. Meanwhile, the halogeno-cyclic-sulfite can inhibit self-discharging of sulfur battery to add this kind of material in the electrolyte of lithium batteries to increase the discharge capacity of lithium-sulfur batteries obviously.

Description

technical field [0001] The invention belongs to the field of lithium batteries, in particular to a halogenated cyclic sulfite and an electrolyte prepared by using the compound, a lithium battery and a lithium-sulfur battery. Background technique [0002] Since its birth in the 1990s, secondary lithium batteries have developed rapidly and vigorously. Typically, a nonaqueous lithium battery includes a lithium negative electrode, an electrolyte composed of a lithium salt dissolved in at least one organic solvent, and a positive electrode of an electrochemically active material. During the charging process, lithium ions migrate from the positive electrode to the negative electrode through the electrolyte, and the flow of lithium ions is reversed during the discharging process. Various non-aqueous lithium batteries are disclosed in Chinese patents 97112161.3, 96114510.2, 97120125.0, and 97190138.4. In recent years, people have paid great attention to some new active materials th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D327/10H01M10/40H01M10/0525H01M10/0567
CPCY02E60/122
Inventor 徐国祥其鲁闻雷陈永翀晨辉安平
Owner PEKING UNIV
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