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Sulfur-based electrolyte solution and application thereof in solid lithium battery

A technology of electrolyte solution and solid lithium, which is applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, secondary battery, etc., and can solve problems such as dead lithium, solid electrolyte layer rupture, and difficulty in mixing the positive electrode and sulfide solid electrolyte evenly

Active Publication Date: 2018-01-16
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, metal lithium as a negative electrode also has the following problems: lithium deposition is uneven during charging, and a large amount of local lithium deposition will accelerate the volume expansion, which leads to the rupture of the solid electrolyte layer (SEI); Li dendrites are formed, and dendrites easily penetrate the separator. The short circuit caused by dendrites has high chemical reaction activity, which is easy to react with the electrolyte and consume the electrolyte; and the dissolution of lithium at the root of the dendrites easily breaks the dendrites and forms dead lithium, resulting in low energy efficiency of the battery bank.
A better composite positive electrode can be prepared by cold pressing, but it is difficult to mix the positive electrode and the sulfide solid electrolyte evenly (the sulfide solid electrolyte usually exists in the form of particles on the surface of the positive electrode), and the preparation conditions of the conventional sulfide solid electrolyte are high. , poor air stability

Method used

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  • Sulfur-based electrolyte solution and application thereof in solid lithium battery
  • Sulfur-based electrolyte solution and application thereof in solid lithium battery
  • Sulfur-based electrolyte solution and application thereof in solid lithium battery

Examples

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Effect test

Embodiment 1

[0104] This example is used to illustrate the preparation of sulfur-based electrolyte solution. Specifically, the preparation of the preparation of the sulfur-based electrolyte solution is as follows:

[0105] (1) According to the molar ratio of 2:1:1, take the S and Li with a total mass of 0.499g 2 S and P 2 S 5 , was added to 2.5ml of triethylene glycol dimethyl ether (TEGDME), stirred at 30°C and a stirring speed of 20rmp for 72h to prepare a solution of polysulfides, the results are shown in figure 1 .

[0106] Such as figure 1 As shown, the polysulfide was completely dissolved and no precipitation was observed.

[0107] (2) Add lithium salt to the solution prepared in step (1), stir and dissolve, so as to obtain a sulfur-based electrolyte solution, which is numbered as electrolyte 10. The ratio of each component in the electrolyte solution 10 is shown in Table 6.

Embodiment 2

[0109] This example is used to illustrate the preparation of sulfur-based electrolyte solution. Specifically, the preparation of the preparation of the sulfur-based electrolyte solution is as follows:

[0110] (1) According to the molar ratio of 4:3:3, take the S and Li with a total mass of 0.467g 2 S and P 2 S 5 , was added into 4ml of tetrahydrofuran (THF), stirred at 50°C and a stirring speed of 100rmp for 36h to prepare a solution of polysulfides, the results are shown in figure 2 .

[0111] Such as figure 2 As shown, the polysulfide was completely dissolved and no precipitation was observed.

[0112] (2) Add lithium salt to the solution prepared in step (1), stir and dissolve, so as to obtain a sulfur-based electrolyte solution, which is numbered electrolyte 6. The ratio of each component in the electrolyte solution 6 is shown in Table 6.

Embodiment 3

[0114] This example studies the polysulfide Li 2 S-P 2 S 5 Solubility in triethylene glycol dimethyl ether (TEGDME). Specifically, according to the molar ratio of 1:3, 2:3, 3:3, 4:3, 5:3, 6:3, 7:3, the total mass of 0.500g Li 2 S and P 2 S 5 , was added to 2.5ml of triethylene glycol dimethyl ether (TEGDME), stirred at a speed of 100rmp for 48h, wherein, Li 2 S:P 2 S 5 = 7:3 dissolution tests were performed at 60°C, while the rest of the tests were performed at room temperature.

[0115] The result after stirring and dissolving for 48h is as follows image 3 shown. From image 3 It can be seen that different proportions of Li 2 S-P 2 S 5 Solubility is not the same, only in Li 2 S:P 2 S 5 = 3: Dissolved at 3, and the rest of the proportions were not completely dissolved, especially for Li 2 S-P 2 S 5 =7:3 polysulfides, still not dissolved under heating conditions.

[0116] Example 3 shows that the polysulfide Li 2 S-P2 S 5 Solubility in solvents is possibl...

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Abstract

The invention provides a sulfur-based electrolyte solution comprising a soluble polysulfide and an organic solvent, the chemical formula of the soluble polysulfide is Sy (Li2S) 100-x-y-z (LiX) z (P2S5) x, wherein, X is one or a plurality of elements of Cl, Br and I, 15<= x <= 90, 0 <=y <=80, 0<=z <=60, x-10 <=100-x-y-z<= x + 10; the mass concentration of the soluble polysulfide in the sulfur-basedelectrolyte solution is 0.1%-40%. The invention also provides a method for preparation of a solid lithium battery by using of the sulfur-based electrolyte solution and the prepared solid lithium battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry and new energy materials, and in particular relates to a sulfur-based electrolyte solution and its application in solid-state lithium batteries. Background technique [0002] In recent years, the rapidly developing electric vehicle and energy storage industries have put forward higher requirements on the energy density, cost, cycle and safety of lithium-ion batteries. [0003] The metal lithium anode is considered as the fourth generation anode, with a capacity up to 3860mAh / g and a low deposition potential (-3.04V). Using metal lithium as the negative electrode can increase the energy density of the battery to 300wh / kg, which can effectively alleviate the mileage anxiety of electric vehicles. At the same time, it can also use lithium-free positive electrodes to reduce battery costs. [0004] The core problem of metallic lithium as the negative electrode lies in the infinite expansion of...

Claims

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Application Information

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IPC IPC(8): H01M10/0568H01M10/058
CPCY02E60/10Y02P70/50
Inventor 黄杰李泓陈立泉
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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