Liquid sulfur positive electrode and semi-liquid lithium-sulfur battery

A liquid sulfur and positive electrode technology, which is applied in the direction of lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of limited improvement in battery performance, low utilization of active materials, and large volume changes, and achieve good cycle stability and Power characteristics, solution to positive electrode sulfur insulation and volume expansion, and good ion conductivity

Active Publication Date: 2021-04-30
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at this stage, there are always problems such as low utilization of active materials and poor cycle stability. The main reasons are poor conductivity of elemental sulfur, large volume change before and after sulfur lithiation, slow conversion kinetics, easy dissolution and shuttle of intermediate products, etc.
Moreover, the battery usually needs to use more electrolyte (that is, the E/S ratio is high), which is not conducive to the actual specific energy improvement, thus greatly hindering its practical application process.
[0003] The existing technology usually combines sulfur with conductive materials, which can improve the conductivity of the electrode and confine lithium pol...

Method used

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  • Liquid sulfur positive electrode and semi-liquid lithium-sulfur battery
  • Liquid sulfur positive electrode and semi-liquid lithium-sulfur battery
  • Liquid sulfur positive electrode and semi-liquid lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Prepare 1.2mol / L Li in a mixed solvent of 1,3-dioxolane (DOL) and N,N-dimethylacetamide (DMAC) at a volume ratio of 0.5:1 2 S 6 Solution (that is, the sulfur concentration is 7.2mol / L), further according to the volume ratio of 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE) and DMAC is 1.5:1 with TTE added as a supporting solvent. Finally add NiCl with a mass fraction of 0.5% 2 and 2% LiNO 3 , and get the desired sulfur-containing solution after mixing evenly.

[0049] The above-mentioned sulfur-containing solution is dropped on the surface of carbon fiber cloth, and the separator and lithium metal are stacked to form a semi-liquid lithium-sulfur battery, such as figure 1 shown.

Embodiment 2

[0051] Prepare 1.0mol / L Li 2 S 8 solution (that is, the sulfur concentration is 8mol / L), and further press the volume ratio of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether (TFTFE) and DMSO to be 1:1 TFTFE was added as a supporting solvent. Finally add NH with a mass fraction of 10% 4 FSI, mixed evenly to obtain the desired sulfur-containing solution.

[0052] The above-mentioned sulfur-containing solution is dropped on the surface of carbon paper, and then laminated with separator and lithium metal to form a semi-liquid lithium-sulfur battery.

Embodiment 3

[0054] Prepare 1.5mol / L Li in dimethyl sulfoxide (DMSO) 2 S 6 solution (that is, the sulfur concentration is 9mol / L), further add TFEE according to the volume ratio of 1,2-bis(1,1,2,2-tetrafluoroethoxy)ethane (TFEE) and DMSO as 3:1 as a supporting solvent. Finally add 0.2% CoCl 2 and 0.2% LiNO 3 , and get the desired sulfur-containing solution after mixing evenly.

[0055] The above-mentioned sulfur-containing solution is dropped on the surface of the nickel mesh, and the semi-liquid lithium-sulfur battery is assembled by stacking with the diaphragm and lithium metal.

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Abstract

The invention discloses a liquid sulfur positive electrode and a semi-liquid lithium-sulfur battery, the liquid sulfur positive electrode comprises a current collector and a sulfur-containing solution, and the sulfur-containing solution at least comprises polysulfide, a high donor number solvent, organic fluoroether and a catalyst. The liquid sulfur positive electrode is high in sulfur loading capacity, low in electrolyte consumption, moderate in viscosity and good in ionic conductivity, the problems of insulation and volume expansion of the sulfur positive electrode can be solved, meanwhile, sulfur conversion reaction kinetics is promoted, and shuttling of polysulfide can be inhibited. The semi-liquid lithium-sulfur battery manufactured by utilizing the liquid positive electrode has high reversible capacity, good cycling stability and rate capability, and the actual energy density has more advantages than that of the traditional solid lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a liquid sulfur positive electrode and a semi-liquid lithium-sulfur battery. Background technique [0002] The theoretical energy density of lithium-sulfur batteries is close to 10 times that of traditional lithium-ion batteries, and the source of raw materials is abundant, and the cost is advantageous. However, there are always problems such as low utilization of active materials and poor cycle stability at this stage. The main reasons are poor conductivity of elemental sulfur, large volume change before and after sulfur lithiation, slow conversion kinetics, and easy dissolution and shuttling of intermediate products. Moreover, the battery usually needs to use more electrolyte (that is, the E / S ratio is high), which is not conducive to the actual specific energy improvement, thus greatly hindering its practical application. [0003] The existing technology usuall...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M10/052
CPCH01M4/362H01M4/5815H01M4/62H01M4/628H01M4/136H01M10/052Y02E60/10
Inventor 卢海周犇袁艳曾富宝杜慧玲郑斌郑学召刘长春
Owner XIAN UNIV OF SCI & TECH
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