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Sulfur-carbon composite material for cathode of lithium ion battery, preparation method and lithium ion battery

A sulfur-carbon composite material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low cost, poor cycle stability, and difficulty in mass production of lithium-sulfur batteries. Achieve the effect of excellent electrochemical performance, fine particle size and small equipment investment

Active Publication Date: 2014-01-22
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw material polymers mentioned in the above patents are relatively expensive, and it is difficult to reflect the advantages of low cost of lithium-sulfur batteries. The cost for industrial production is too high, and the cycle stability is not very good as the number of cycles increases.
[0008] In short, in the existing manufacturing methods of battery cathode materials, there are more or less disadvantages such as complicated process, high cost, and difficulty in mass production.

Method used

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  • Sulfur-carbon composite material for cathode of lithium ion battery, preparation method and lithium ion battery
  • Sulfur-carbon composite material for cathode of lithium ion battery, preparation method and lithium ion battery

Examples

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Effect test

Embodiment 1

[0031] (1) Preparation of porous catechol formaldehyde resin

[0032] Add 2.20g of catechol, 2ml of formaldehyde and 5ml of concentrated hydrochloric acid into 10ml of ethanol, stir to dissolve completely, put the above solution into a 50ml autoclave, keep it at 100°C for 5 hours, and synthesize the porous polymer ophthalmic acid. Hydroquinone formaldehyde resin gel; the obtained gel is crushed, dried in vacuum at 80° C. for 12 hours, and the vacuum degree is -0.1 MPa, and the obtained material is ground into powder with a mortar for use.

[0033] The obtained phenolic resin scanning electron micrograph is as follows figure 1 As shown in a and b, it can be seen that the sample has a honeycomb structure with small and dense pores. In the low-magnification pictures, it can be seen that there are some independent circular cavities in the sample, and it can be seen that the inner surface is relatively smooth. Synthetic The porous phenolic resin polymer contains micropores of 0.4-...

Embodiment 2

[0038] (1) Preparation of porous hydroquinone formaldehyde resin

[0039] Add 3.30g of hydroquinone, 12ml of formaldehyde and 6ml of concentrated hydrochloric acid into 20ml of ethanol, stir to dissolve it completely, put the above solution into a 50ml autoclave, keep it warm at 120°C for 10 hours, mash the resulting gel, Vacuum drying at 100°C for 12 hours, vacuum degree -0.1MPa, porous hydroquinone formaldehyde resin, and grinding the obtained material into powder with a mortar for use.

[0040] (2) Preparation of sulfur-carbon composite materials

[0041] Mix the polymer phenolic resin and sulfur powder obtained in step (1) uniformly in a mass ratio of 1:2, heat at a heating rate of 5°C / min under the protection of argon, and roast at a constant temperature of 300°C for 2 hours to obtain elemental sulfur / Sulphur-containing polymer composite material, the sulfur content of which is 47.08wt%.

[0042] The obtained positive electrode material is mixed with conductive agent a...

Embodiment 3

[0044] (1) Preparation of porous phenol-formaldehyde resin

[0045] Add 2.82g of phenol, 6ml of formaldehyde and 0.5g of sodium hydroxide into 20ml of deionized water, stir to dissolve it completely, put the above solution into a 50ml autoclave, keep it warm at 150°C for 5 hours, mash the resulting gel, 120 ℃ temperature vacuum drying for 6 hours, vacuum degree -0.1MPa, porous phenol-formaldehyde resin, the obtained material is ground into powder with a mortar for use.

[0046] (2) Preparation of sulfur-carbon composite materials

[0047] The polymer phenolic resin and sulfur powder obtained in step (1) are uniformly mixed in a mass ratio of 1:3, under the protection of a mixed gas of 95% argon and 5% hydrogen, heated at a heating rate of 5°C / min, at 400°C Calcined at constant temperature for 1 hour to obtain elemental sulfur / sulfur-containing polymer composite material with a sulfur content of 41 wt%.

[0048] The obtained positive electrode material is mixed with conductiv...

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Abstract

The invention provides a sulfur-carbon composite material for the cathode of a lithium ion battery, a preparation method, and the lithium ion battery assembled by taking the sulfur-carbon composite material produced by the method as an electrode. The sulfur-carbon composite material consists of two parts which are a porous sulfur-containing macromolecular polymer and elementary sulfur respectively, wherein the porous sulfur-containing macromolecular polymer has high electric conductivity, and is used for holding sulfur and small molecular sulfides generated in an electrolysis process; and the elementary sulfur has electrochemical activity. The sulfur-carbon composite material can serve as the cathode material of the lithium ion battery, and has the sulfur content of 30 to 60 weight percent.

Description

technical field [0001] The invention relates to the technical field of battery manufacturing, in particular to a sulfur-carbon composite material for a positive electrode of a lithium ion battery, a preparation method thereof, and a lithium ion battery. Background technique [0002] At present, environmental and energy issues are increasingly attracting people's attention, and environmentally friendly and efficient energy is being reused more and more. Electric energy can be said to be the most important energy source in the world today. Batteries have also attracted the attention of researchers because they are an important component and storage form of electric energy, and have triggered "battery revolutions" one after another. High energy density, long cycle life and other performance advantages make lithium-ion battery the most promising storage battery system. As a high-performance secondary green battery, it has been widely used in various portable electronic products ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/139H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 朱广燕曾绍忠陈效华
Owner CHERY AUTOMOBILE CO LTD
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