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Aromatic condensed ring quinones compound positive pole material for one-class lithium secondary battery

A technology for lithium secondary batteries and positive electrode materials, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of inability to meet the requirements of high-rate charge and discharge, the utilization rate of carbonyl sites is less than half, and the difficulty of bulk electron transport. Achieve the effects of high working voltage, high power density and good cycle performance

Active Publication Date: 2014-12-24
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in most molecular structures densely containing more than two carbonyl groups, the utilization rate of carbonyl sites is often less than half, resulting in the measured capacity of carbonyl compounds is often limited to about 200mAhg -1 about
On the other hand, organic compounds are usually insulators, and it is difficult for electrons to transport in the bulk phase. Most organic electrode materials cannot meet the requirements of high-rate charge and discharge.

Method used

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  • Aromatic condensed ring quinones compound positive pole material for one-class lithium secondary battery
  • Aromatic condensed ring quinones compound positive pole material for one-class lithium secondary battery
  • Aromatic condensed ring quinones compound positive pole material for one-class lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Grind 6mg of isobenzoquinone derivative A-10, 10mg of carbon black and 4mg of polyvinylidene fluoride into a slurry in 80μL of N-methylpyrrolidone, and evenly coat it on an aluminum foil with a diameter of 12mm, and then in -1MPa air, Dry at 343K for 3 hours and at 393K for 2 hours to make electrode sheets. In a glove box filled with argon gas, use the electrode sheet as the positive electrode, polyethylene / polypropylene / polyethylene three-layer film as the separator, and lithium hexafluorophosphate in a 1:1 volume ratio of ethylene carbonate and dimethyl carbonate mixed solvent 1mol / L solution is used as the electrolyte, and metal lithium is used as the negative electrode to assemble a lithium secondary battery. battery at 0.1C (26mA g -1 ) under constant current charge and discharge, the discharge voltage range is 1.8-3.4V. The first charge and discharge curve as figure 1 As shown, the first discharge capacity is 231mAh g -1 , the average discharge voltage is 2.7...

Embodiment 2

[0034] The synthesis of isobenzoquinone derivative PA-6 is shown in the following formula

[0035]

[0036] 3,8-Dibromophenanthroline on Ni(cod) 2 Under the action of reagents, polyphenanthroline is obtained by reduction polymerization, which is converted into PA-6 under mixed acid oxidation (the method is the same as the synthesis of A-10 above). Grind 10mg of PA-6, 10mg of carbon black and 5mg of polyvinylidene fluoride in 60μL of N-methylpyrrolidone evenly and coat it on aluminum foil, then dry it in 200Pa air at 393K for 4 hours to make an electrode sheet. The fabrication of the battery was the same as in Example 1. At 0.1-2C (26-510mAg -1 ) to charge and discharge the battery with a constant current, and the discharge voltage range is 1.8-3.6V. The cycle charge and discharge capacity retention curve is as follows figure 2 As shown, the discharge capacity at 0.1C reaches 197mAh g -1 , the average discharge voltage is 2.53V, half of the capacity can still be releas...

Embodiment 3

[0038] Grind 5 mg of isobenzoquinone derivative X-1 and 5 mg of carbon black in 60 μL of N-methylpyrrolidone evenly and coat it on an aluminum foil, then dry it in 150 Pa air at 343 K for 3 hours to make an electrode sheet. The fabrication of the battery was the same as in Example 1. on battery at 0.1C (41mA g -1 ) under constant current charge and discharge, the discharge voltage range is 1.6-3.6V. The first charge and discharge curve as image 3 As shown, the first discharge capacity is 360mAhg -1 , the average discharge voltage is 2.59V, and the energy density is 843Wh kg -1 , the first Coulombic efficiency is 99.5%.

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Abstract

The invention discloses an aromatic condensed ring quinones compound positive pole material for a one-class lithium secondary battery. The compound is a quinones compound which takes benzoquinone or isobenzoquinone with an aromatic condensed ring structure as a electrochemical oxidation reduction reaction locus, and the compound comprises an aromatic condensed ring benzoquinone derivative and an aromatic condensed ring isobenzoquinone derivative; the compound can join in pole preparation in a molecular crystal or polymer mode; in the polymer mode, corresponding structural units are directly connected through C-C bonds or connected through S atoms; and the benzoquinone / isobenzoquinone which is stabilized through an aromatic (hetero) condensed ring is used as the electrochemical oxidation reduction reaction locus and is compounded with conductive carbon in the molecular crystal or polymer mode so as to prepare the pole. The material has the advantages that the positive pole material has high energy density, rate power density and circulation stability, 86% of the initial capacity can be still maintained after being circulated for 50 cycles, so that the material can be probably applied to the next generation of environmental-friendliness energy storage batteries with high energy and high power.

Description

technical field [0001] The invention relates to an organic cathode material for lithium secondary batteries, in particular to a class of aromatic condensed ring quinone compound cathode materials for lithium secondary batteries. Background technique [0002] Due to its high energy and power density, lithium secondary batteries occupy a pivotal position in the mobile electronic product market. After the expansion of research technology and application fields in recent years, lithium-ion batteries have begun to move towards diversification. In electric vehicles and storage There is also a huge demand in fields such as power stations. [0003] The working principle of traditional lithium secondary batteries is based on the ion intercalation mechanism, also known as lithium-ion batteries. The negative electrode materials are mainly carbon-based materials (such as graphite-based lithium battery negative electrode materials), and the positive electrode materials are lithium-contai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/60
CPCY02E60/10
Inventor 陈军梁衍亮陶占良张鹏
Owner NANKAI UNIV
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