Lithium-sulfur battery positive copolymer sulfur material and prepared lithium-sulfur battery made from material

A lithium-sulfur battery and copolymerization technology, which is applied in the battery cathode material and battery field to achieve the effects of convenient operation, favorable for large-scale production, and cheap and easy-to-obtain raw materials

Active Publication Date: 2019-03-29
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above three types of methods can all play a role in inhibiting the "polysul

Method used

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  • Lithium-sulfur battery positive copolymer sulfur material and prepared lithium-sulfur battery made from material
  • Lithium-sulfur battery positive copolymer sulfur material and prepared lithium-sulfur battery made from material
  • Lithium-sulfur battery positive copolymer sulfur material and prepared lithium-sulfur battery made from material

Examples

Experimental program
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Effect test

Example Embodiment

[0039] Example 1:

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

[0041] (2) The mixture obtained in step (1) is heated to 120°C at a temperature increase rate of 10°C / min.

[0042] (3) Keep the mixture obtained in step (2) at 120° C. and stir for 6 hours.

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

[0044] See photos of sublimated sulfur powder figure 1 The leftmost sample, the second from the left is a photo of the 10% copolymerized sulfur product of valeronitrile prepared in this example. figure 2 This is an electron micrograph of the copolymerized sulfur product, and it can be seen that the particle size of the pow...

Example Embodiment

[0048] Example 2

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

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

[0051] (3) Keep the mixture obtained in step (2) at 120° C. and stir for 6 hours.

[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 a copolymerized sulfur product containing 20% ​​valeronitrile prepared in this example. image 3 It is an electron microscope photo of the copolymerized sulfur product. It can be seen in the figure that the copolymerized sulfur presents agglomerated state, the block size is large, and there are a few granular protrusions on the surface. Figure 4 It is the XRD pattern of the product. Figure 5 In order to perform thermogravimetric analysis on the product obtained i...

Example Embodiment

[0055] Example 3

[0056] (1) Add 1.5 g of valeronitrile to 3.5 g of sublimed sulfur powder, and perform low-speed ball milling for 4 hours at a ball milling speed of 400 r / min to obtain a stable uniform mixture;

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

[0058] (3) Keep the mixture obtained in step (2) at 120° C. and stir for 6 hours.

[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 a copolymerized sulfur product containing 30% valeronitrile prepared in this example. Figure 4 It is the XRD pattern of the product. Figure 5 In order to perform thermogravimetric analysis on the product obtained in this example, the polymerized sulfur samples of 0~650°C, 10wt.%, 20wt.% and 30wt.% valeronitrile start to lose weight at about 130°C, which basically guarantees the battery preparation process The thermal stability. Image...

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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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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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