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Preparation method of high-energy density lithium sulphur power battery and battery

A high energy density, power battery technology, applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle stability and cruising range of less than 350 kilometers, and achieve the effect of increasing energy density, low price, and abundant resources

Inactive Publication Date: 2018-09-14
桑顿新能源科技(长沙)有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this stage, lithium-ion power batteries using ternary materials as positive electrodes have an energy density of only 200Wh / kg to 280Wh / kg, and a cruising range of less than 350 kilometers. Under the current situation of poor cycle stability of high-nickel NCM and NCA positive electrode materials, it is difficult to achieve short-term achieve the above goals

Method used

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  • Preparation method of high-energy density lithium sulphur power battery and battery
  • Preparation method of high-energy density lithium sulphur power battery and battery
  • Preparation method of high-energy density lithium sulphur power battery and battery

Examples

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Embodiment 1

[0031] Step S1: Preparation of sulfur-containing cathode active material

[0032] Weigh the elemental sulfur and sepiolite according to the weight percentage of 75%: 25%, and carry out preliminary mixing to make the elemental sulfur evenly mixed in the sepiolite, then mix and grind in the ball mill for 3 hours, and then put the mixed powder into the tube In the furnace, set the temperature at 155°C under vacuum or N2 atmosphere, and calcined for 3 hours; then further raised the temperature to 320°C, and calcined for 1 hour to remove the elemental sulfur that was not incorporated into the mixing surface; Sepiolite / sulfur composites smaller than 15 μm.

[0033] Step S2: Preparation of cathode slurry

[0034] First weigh sepiolite / sulfur composite material, acetylene black, PVDF respectively according to weight percentage 89%: 7.5%: 3.5%, then weigh solvent NMP according to the ratio of glue liquid solid content 6%, stirring speed 40 rpm, The dispersion speed is 35 rpm, 3h to g...

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Abstract

The invention discloses a preparation method of a high-energy density lithium sulphur power battery and a battery. Metal lithium is compactly pressed into foam copper; the formation of arborescent crystals in the lithium sulphur battery can be relieved through the pore structures of the foam copper; the diaphragm piercing by the lithium arborescent crystals can be avoided; the safety performance of the battery is improved; in addition, a diaphragm bag with an opening at one end is used for encapsulating the foam copper / lithium negative electrode sheet to obtain a fully sealed small unit; on one hand, the short circuit problem due to positive electrode and negative electrode position staggering caused by diaphragm drapes in the sheet lamination process can be solved; on the other hand, thedirect contact between the metal lithium layer with the air or the oxygen gas in the sheet lamination process can be avoided.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a preparation method of a lithium-sulfur power battery with high energy density and the battery. Background technique [0002] As environmental problems become more and more serious and policy-oriented, various countries around the world have successively formulated policies to ban the sale of fuel vehicles in a few years and replace them with new energy electric vehicles. Therefore, new energy vehicles are the only way for the development of my country's current automotive field, and it is necessary to increase research and development efforts to develop new products that meet current needs. In the past two years, China's new energy market has grown rapidly, and various car companies have also begun to vigorously promote new energy vehicles. [0003] The power battery is the core part of electric vehicles, and it is also a key part of the rapid development of new en...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/1397H01M10/0525
CPCH01M4/136H01M4/1397H01M10/0525Y02E60/10
Inventor 伍成徐海平刘学良刘昆武媛王耐清李小兵陈小平
Owner 桑顿新能源科技(长沙)有限公司
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