A kind of protection method of lithium-sulfur battery negative electrode

A lithium-sulfur battery and negative electrode technology, which is applied in the field of lithium-sulfur battery negative electrode protection, can solve the problems of reducing the conductivity of the solution, increasing the viscosity, etc., and achieve the effects of improving cycle performance and Coulombic efficiency, preventing corrosion, and excellent electrochemical performance

Active Publication Date: 2018-03-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, adding additives to the electrolyte often reduces the conductivity of the solution, increases the viscosity, and has a negative impact on the electrochemical performance.

Method used

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  • A kind of protection method of lithium-sulfur battery negative electrode
  • A kind of protection method of lithium-sulfur battery negative electrode
  • A kind of protection method of lithium-sulfur battery negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Soak the used lithium sheet in 2.3-dimethyldibutene for 1 min, wipe it and dry it after taking it out.

[0029] The electrolyte used in lithium-sulfur batteries uses ethylene glycol dimethyl ether (DME) and dioxolane (DIOX) as solvents, lithium trifluoromethanesulfonimide (LiTFSI) as lithium salt, and the mass of DME 1% LiNO by mass of the mixture of , DIOX and lithium trifluoromethanesulfonimide 3 .

[0030] Wherein, the volume ratio of DME to DIOX is 1:1; the concentration of LiTFSI in the solvent is 1mol / L.

[0031] The pretreated lithium sheet was used as the negative electrode, the composite of Ketjen Black ECP600JD and sulfur (the mass ratio of Ketjen Black ECP600JD to sulfur was 1:1) was used as the positive electrode, and a button cell was fabricated for electrochemical performance testing. A blank battery with lithium sheet pretreatment was used for comparison. Such as figure 1 As shown, in comparison, the performance of the lithium-sulfur battery after pre...

Embodiment 2

[0033] Soak the used lithium sheet in butadiene for 1 min, wipe it and dry it after taking it out.

[0034] The electrolyte used in lithium-sulfur batteries uses polyethylene glycol dimethyl ether (TEGDME) as a solvent, Li[N(SO 2 CF 3 ) 2 ] is a lithium salt, and the added mass is TEGDME and Li[N(SO 2 CF 3 ) 2 ] 1% LiNO by mass of the mixture 3 . Li[N(SO 2 CF 3 ) 2 ] The concentration in the solvent is 1mol / L.

[0035] The pretreated lithium sheet was used as the negative electrode, the composite of Ketjen Black ECP600JD and sulfur (the mass ratio of Ketjen Black ECP600JD to sulfur was 1:1) was used as the positive electrode, and a button cell was fabricated for electrochemical performance testing. A blank battery with lithium sheet pretreatment was used for comparison. Such as figure 2 It is shown that the lithium ion migration resistance on the surface of the lithium anode increases after the pretreatment of the lithium sheet, which reflects the polymerization o...

Embodiment 3

[0037] Soak the used lithium sheet in cyclopentadiene for 1 min, wipe it and dry it after taking it out.

[0038] The electrolyte used in lithium-sulfur batteries uses polyethylene glycol dimethyl ether (TEGDME) as a solvent, Li[N(SO 2 CF 3 ) 2 ] is a lithium salt, and the added mass is TEGDME and Li[N(SO 2 CF 3 ) 2 ] 1% LiNO by mass of the mixture 3 . The concentration of Li[N(SO2CF3)2] in the solvent is 1mol / L.

[0039] The pretreated lithium sheet was used as the negative electrode, the composite of Ketjen Black ECP600JD and sulfur (the mass ratio of Ketjen Black ECP600JD to sulfur was 1:1) was used as the positive electrode, and a button cell was fabricated for electrochemical performance testing. A blank battery with lithium sheet pretreatment was used for comparison.

[0040] Through experimental verification and results, it is shown that the lithium ion migration resistance on the surface of lithium negative electrode increases after pretreatment with cyclopenta...

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Abstract

The invention discloses a method for protecting the anode of a lithium sulphur battery. The anode of a lithium sheet is immersed in an organic compound including double bonds and / or three bonds, such that a flexible protective film is formed on the surface of the lithium sheet; and thus, polysulfide ions and the shuttling effect and the anode surface passivation caused by reaction are inhibited. Compared with the blank lithium sulphur battery, the lithium sheet of which is not pre-processed, the electrochemical performance of the lithium sulphur battery, the lithium sheet anode of which is pre-processed by using the organic compound including the double bonds, is obviously improved; the capacity is still above 400 mAh / g after 100 weeks; the cycle life is relatively long; and the electrochemical performance is excellent.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur batteries, and in particular relates to a method for protecting the negative electrodes of lithium-sulfur batteries. Background technique [0002] Given that lithium-sulfur batteries have many advantages such as ultra-high theoretical specific capacity and cheap and easy-to-obtain sulfur in nature, they are expected to become a new generation of battery energy storage systems in the future, but there are still certain technical bottlenecks before their commercial application. This is mainly due to the rapid capacity decline caused by the dissolution and shuttling of polysulfide ions formed in the battery charge and discharge process, in which the polysulfide ions react with the negative electrode of the lithium sheet to form lithium disulfide, the passivation of lithium sulfide This layer not only consumes the active material of the positive electrode, but also leads to corrosion and passivation of t...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/052
CPCH01M4/13H01M4/139H01M10/052Y02E60/10
Inventor冯金奎张震姬冰
OwnerSHANDONG UNIV