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Lithium-sulphur battery anode material and preparation method thereof

A cathode material, sulfur battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of rapid capacity decay, low utilization rate of active materials, low specific capacity of sulfur electrodes, etc., and achieve the effect of improving cycle performance

Inactive Publication Date: 2012-09-19
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to use a porous material with lithium storage capacity within the operating voltage range of the sulfur electrode to load elemental sulfur or lithium sulfide to form a composite material, so as to overcome the low utilization rate of the active material of the current lithium-sulfur battery, the rapid capacity decay, and the sulfur electrode. The disadvantage of low overall specific capacity, improve the specific capacity and specific energy of sulfur electrodes and lithium-sulfur batteries

Method used

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  • Lithium-sulphur battery anode material and preparation method thereof
  • Lithium-sulphur battery anode material and preparation method thereof
  • Lithium-sulphur battery anode material and preparation method thereof

Examples

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Effect test

Embodiment 1-84

[0031] The carrier material is lithium titanate (Li 4 Ti 5 o 12 ), the negative plate is made of metal lithium, and the electrolyte is 1mol / L bis-three mixed organic solvent 1,3-dioxolane (DOL): ethylene glycol dimethyl ether (DME) = 1:1 (v:v) Lithium fluoromethanesulfonate imide (LiTFSI) solution.

Embodiment 1

[0033] A lithium-sulfur battery positive electrode material, the specific process of adopting scheme 1 is as follows:

[0034] Li 4 Ti 5 o 12 The preparation process of the composite material with elemental sulfur is as follows: Li 4 Ti 5 o 12 Mix with elemental sulfur at a weight ratio of 1:5, press into tablets, place in a tube furnace, pass argon, and treat at 155°C for 12 hours, and then at 300°C for 2 hours.

[0035] Weigh a certain amount of Li according to the weight percentage 80:15:5 4 Ti 5 o 12 Composite with elemental sulfur, acetylene black and polytetrafluoroethylene (PTFE), ground, rolled out, pressed onto an aluminum mesh, and subsequently dried.

[0036] The charge and discharge curve of the battery in the first week is as follows: figure 1 shown. from figure 1 It can be seen that the discharge specific capacity of the battery in the first week is 1698mAh / g, and the charge specific capacity is 1822mAh / g.

Embodiment 2

[0038] A lithium-sulfur battery positive electrode material, the specific process of adopting scheme 2 is as follows:

[0039] Li 4 Ti 5 o 12 The preparation process of the composite material with elemental sulfur is as follows: Li 4 Ti 5 o 12 Mix with elemental sulfur at a weight ratio of 1:3, press into tablets, put in a tube furnace, pass argon, and treat at 155°C for 12 hours.

[0040] Will Li 4 Ti 5 o 12 Soak the composite material with elemental sulfur in triton (polyethylene glycol p-isooctylphenyl ether) solution for 2 hours, take it out, and dry it in vacuum to obtain polyethylene glycol (PEG)-coated Li 4 Ti 5 o 12 Composite with elemental sulfur.

[0041] Weigh Li respectively according to weight percentage 80:15:5 4 Ti 5 o 12 Composite with elemental sulfur, acetylene black and polytetrafluoroethylene (PTFE), ground, rolled out, pressed onto an aluminum mesh, and subsequently dried.

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Abstract

The invention discloses a lithium-sulphur battery anode material, which adopts the technical scheme that elemental sulphur or lithium sulfide is loaded into one or various carrier materials to form a novel composite electrode for a lithium-sulphur battery. The carrier material (s) is (are) characterized in that within the operation voltage range of the elemental sulphur or the lithium sulfide, the carrier material (s) is (are) also provided with electrochemical activity, that is, is (are) provided with considerable lithium storage capacity, and simultaneously has (have) characteristics of high specific surface and high porosity. The invention also discloses a preparation method of the lithium-sulphur battery anode material. The system of the electrode solves problems that the carrier material of a conventional lithium-sulphur battery anode material is not provided with the electrochemical activity and is low in composite material specific capacity within the operation voltage range of the elemental sulphur or the lithium sulfide, and the integral specific capacity of the composite electrode and the energy density of the lithium-sulphur battery are improved.

Description

technical field [0001] The invention belongs to the technical field of batteries. Especially a kind of cathode material of lithium secondary battery. Background technique [0002] Lithium-ion battery is the secondary battery with the best comprehensive performance at present, and has been widely used in portable electronic products such as mobile phones, digital cameras, notebook computers and electric tools. With the rapid development of various scales of energy storage power stations, electric vehicles, and smart grids, the requirements for the energy density and power density of lithium-ion batteries are also getting higher and higher. However, limited by the theoretical lithium storage capacity of the battery system and electrode materials, the specific energy of lithium-ion batteries will remain at 300Wh even considering the use of positive and negative electrode materials with higher specific capacities and more advanced design and manufacturing technologies in the fu...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/58
CPCY02E60/12Y02E60/10
Inventor 王兆翔王雪锋陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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