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A lithium-sulfur battery cathode copolymerized sulfur material and a lithium-sulfur battery made of it

A lithium-sulfur battery and positive electrode technology, applied in the field of energy materials, to achieve the effects of easy operation, large-scale production, and cheap and easy-to-obtain raw materials

Active Publication Date: 2020-10-09
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above three types of methods can all play a role in inhibiting the "polysulfide shuttle" from different perspectives, but each has certain limiting factors

Method used

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  • A lithium-sulfur battery cathode copolymerized sulfur material and a lithium-sulfur battery made of it
  • A lithium-sulfur battery cathode copolymerized sulfur material and a lithium-sulfur battery made of it
  • A lithium-sulfur battery cathode copolymerized sulfur material and a lithium-sulfur battery made of it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Add 0.5g valeronitrile to 4.5g sublimated sulfur powder, and carry out low-speed ball milling to it for 4h, (the ball milling speed is 400r / min, every ten minutes interval of ball milling is 3 minutes) to obtain a stable homogeneous mixture;

[0041] (2) Heat the mixture obtained in step (1) to 120° C. at a heating rate of 10° C. / min.

[0042] (3) The mixture obtained in step (2) was kept at 120° C. and stirred for 6 h.

[0043] (4) The mixture obtained in step (3) was cooled to room temperature and then ball milled for 4 hours (the ball milling speed was 400 r / min, and the milling interval was 3 minutes every 10 minutes).

[0044] For pictures of sublimated sulfur powder see figure 1 The leftmost sample, the second from the left is the photo of the copolymerized sulfur product in which valeronitrile made in this embodiment accounts for 10%. figure 2 It is an electron micrograph of the copolymerized sulfur product, and it can be seen that the particle size of the...

Embodiment 2

[0049] (1) Add 1g of valeronitrile to 4g of sublimated sulfur powder, and carry out low-speed ball milling to it for 4h to obtain a stable homogeneous mixture;

[0050] (2) Heat the mixture obtained in step (1) to 120° C. at a heating rate of 10° C. / min.

[0051] (3) The mixture obtained in step (2) was kept at 120° C. and stirred for 6 h.

[0052] (4) The mixture obtained in step (3) was cooled to room temperature and ball milled for 4 hours.

[0053] figure 1 The third sample from the left is a photo of the copolymerized sulfur product in which valeronitrile produced in this example accounts for 20%. image 3 It is an electron micrograph of the copolymerized sulfur product. It can be seen from the figure that the copolymerized sulfur is in an agglomerated state, with a large particle size and a small amount of granular protrusions on the surface. Figure 4 is the XRD pattern of the product. Figure 5 As a result of the thermogravimetric analysis experiment on the product...

Embodiment 3

[0056] (1) Add 1.5g valeronitrile to 3.5g sublimated sulfur powder, and carry out low-speed ball milling to it for 4h at a ball milling speed of 400r / min to obtain a stable homogeneous mixture;

[0057] (2) Heat the mixture obtained in step (1) to 120° C. at a heating rate of 10° C. / min.

[0058] (3) The mixture obtained in step (2) was kept at 120° C. and stirred for 6 h.

[0059] (4) The mixture obtained in step (3) was cooled to room temperature and ball milled for 4 hours.

[0060] figure 1 The rightmost sample is a photo of the copolymerized sulfur product in which valeronitrile produced in this embodiment accounts for 30%. Figure 4 is the XRD pattern of the product. Figure 5 As a result of the thermogravimetric analysis experiment on the product obtained in this example, the polymerized sulfur samples of 10wt.%, 20wt.% and 30wt.% valeronitrile at 0-650°C began to lose weight at about 130°C, which basically guaranteed the battery preparation process. thermal stabili...

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Abstract

The invention provides a lithium-sulfur battery positive copolymer sulfur material. The lithium-sulfur battery positive copolymer sulfur material is prepared through steps as follows, (1), sublimed sulfur powder and organic polymerization agent are collected to obtain uniform mixture through grinding, and the organic polymerization agent is nitrile organic substance; (2), the uniform mixture of the sublimed sulfur and the organic polymerization agent is sealed in a container under the high temperature condition and is insulated and stirred; and (3), the copolymerized sulfur obtained in the step (2) is pulverized to obtain positive electrode copolymerized sulfur particles. The invention further provides a lithium-sulfur battery made from the lithium-sulfur battery positive copolymer sulfurmaterial. The lithium-sulfur battery positive copolymer sulfur material is advantaged in that preparation requirements can be met through simple heating equipment, and the preparation process has characteristics of convenient operation and simple process. The preparation method is advantaged in that chemical bonding between the organic matter and the sulfur is produced through bond opening reaction of nitrile compounds'unique carbon-nitrogen triple bond and the 8-membered ring structure of the sublimated sulfur at the high temperature, and the polymeric sulfur copolymer can be formed.

Description

technical field [0001] The invention belongs to the field of energy materials, and in particular relates to a battery cathode material and a battery made of the cathode material. Background technique [0002] With the rapid development of mobile devices, the energy density (~150Wh / kg) of existing commercial lithium-ion batteries can no longer meet the increasing energy consumption demands of these devices, and there is an urgent need to develop new high-energy-density secondary batteries. Among many candidate batteries, lithium-sulfur batteries have become one of the most promising secondary batteries due to their high energy density, long working and storage life, high safe operation performance, and low cost. [0003] Elemental sulfur has always been regarded as the most potential cathode material for rechargeable lithium batteries. It has a very high theoretical specific capacity (1675mAh / g), low price, environmental protection, non-toxic, safety and other outstanding pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/60H01M4/36H01M10/052
CPCH01M4/362H01M4/602H01M10/052Y02E60/10
Inventor 李彬杨树斌徐鸿飞
Owner BEIHANG UNIV
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