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A lithium-sulfur battery charging method

A charging method and lithium-sulfur battery technology, which is applied in the direction of lithium battery, secondary battery charging/discharging, secondary battery, etc., can solve the problem of battery charging and discharging efficiency reduction, and achieve the effect of improving charging and discharging efficiency and cycle performance

Active Publication Date: 2018-12-04
SHANGHAI INST OF SPACE POWER SOURCES
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that lithium nitrate is gradually consumed in the battery, and develop a charging method to alleviate the problem of reduced battery charge and discharge efficiency after the lithium nitrate additive is exhausted, and improve the cycle performance of lithium-sulfur batteries

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  • A lithium-sulfur battery charging method
  • A lithium-sulfur battery charging method
  • A lithium-sulfur battery charging method

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Experimental program
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Embodiment 1

[0023] Lithium-sulfur battery preparation:

[0024] Sulfur cathode preparation: Weigh 300g of elemental sulfur, 90g of superconducting carbon black Super P, 60g of vapor-grown carbon fiber VGCF, and 50g of binder polyvinylidene fluoride PVDF, and use N-methylpyrrolidone NMP as solvent to adjust the viscosity. After the slurry was stirred for 12 hours at 2 . Then apply the same thickness of coating on the reverse side. The prepared sulfur cathode was cut into 700mm x 83mm wide pole pieces, and dried in a vacuum oven at 60°C for 48 hours for later use.

[0025] Lithium-sulfur battery assembly: Under dry air conditions with a dew point 3 ), the electrolyte filling volume is 1.5g. The initial discharge current of the battery is 250mA, and the discharge cut-off voltage is 1.5V.

[0026] Lithium-sulfur battery charge and discharge cycle:

[0027] At room temperature of 20°C±5°C, charge the 5Ah lithium-sulfur battery in the discharge state above, and record the battery voltage an...

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Abstract

The invention discloses a charging method of a lithium-sulfur battery, which comprises the following steps of: S1, at a room temperature of 20 DEG C plus and minus 5 DEG C, firstly charging the battery with a first current for over 2 hours to reach a voltage of 2.35V; and S2, continuously charging the battery with the first current, when a charging voltage-time curve reaches an inflection point, starting to charge the battery with a second current, and when the voltage reaches over 2.5V, stopping charging, wherein the first current is smaller than the second current. The charging method of the lithium-sulfur battery, which is disclosed by the invention, can solve the problem of obvious reduction of battery charging-discharging efficiency after a lithium nitrate additive is consumed up, overcomes a self-discharge current of a shuttle effect by increasing the charging current, and improves charge-discharge efficiency and cycle performance of the lithium-sulfur battery.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a charging method for a lithium-sulfur battery. Background technique [0002] Due to its advantages of high energy density and low cost, lithium-sulfur batteries have become a secondary green chemical power source that has attracted much attention and invested a lot of research in recent years. The theoretical energy density of lithium-sulfur batteries is as high as 2600Wh / kg, and the actual energy density can even reach more than 500Wh / kg, which has obvious application potential. The discharge of sulfur belongs to the dissolution reaction mechanism. During the discharge process, it will be reduced to a soluble intermediate product lithium polysulfide, which can move freely in the electrolyte. When charging, the low-valence lithium polysulfide on the positive electrode side is oxidized to a high-valence state, and the high-valence lithium polysulfide will diffuse ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/052
CPCH01M10/052H01M10/44H01M10/446Y02E60/10
Inventor 郭瑞刘雯裴海娟李永解晶莹
Owner SHANGHAI INST OF SPACE POWER SOURCES