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Compound for positive electrode material of lithium ion battery, and preparation method and application

A technology for lithium ion batteries and cathode materials, which is applied in the field of electrochemical energy storage, can solve problems such as voltage reduction and specific capacity reduction, and achieves the effects of high reaction yield and simple synthesis.

Active Publication Date: 2020-05-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The first method has limited performance improvement, and the introduction of inactive parts makes the actual specific capacity greatly reduced; the molecular solubility prepared by the second method is still very good, and gel or solid electrolyte is required; the third method Method Due to the limitation of the polymerization method, the resulting polymer structure contains electron-donating groups, resulting in a large decrease in voltage (about 2.0V)

Method used

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  • Compound for positive electrode material of lithium ion battery, and preparation method and application
  • Compound for positive electrode material of lithium ion battery, and preparation method and application
  • Compound for positive electrode material of lithium ion battery, and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1-compound synthesis

[0037] In a 100ml branch bottle connected to a double-row tube with a built-in magnet, add 3.55g (19.5mmol, 2.4eqv.) 2,5-dimethoxyphenylboronic acid, 2.00g (8.13mmol, 1.0 eqv.) p-dibromobenzene, 0.750g (0.650mmol, 0.08eqv.) tetrakis (triphenylphosphine) palladium and 3.93g (28.5mmol, 3.5eqv.) potassium carbonate, after pumping nitrogen three times, add in sequence with a syringe Toluene, methanol and water after nitrogen sparging. Heating to 100°C, to mild reflux, and reflux for 10 hours under nitrogen atmosphere. Stop the reaction, after cooling to room temperature, use a rotary evaporator to spin off most of the solvent, add 300 ml of water, extract the aqueous phase with 150 ml of dichloromethane three times, dry the organic phase with anhydrous magnesium sulfate, and separate the crude product by column chromatography , the eluent was petroleum ether: ethyl acetate (8:1), and 1.70 g (67%) of pure product was obtained. 1 H NMR (De...

Embodiment 2

[0039] Example 2-compound synthesis

[0040] In a 100ml three-neck flask connected to a double-row tube, a magnet was built in, and 3.25g (17.9mmol, 2.2eqv.) 2,5-dimethoxyphenylboronic acid, 2.00g (8.13mmol, 1.0eqv.) were added successively .) p-dibromobenzene, 0.469g (0.406mmol, 0.05eqv.) tetrakistriphenylphosphine palladium and 2.25g (16.3mmol, 2.0eqv.) potassium carbonate, after replacing the nitrogen twice, use a constant pressure ground liquid funnel Nitrogen-bubbled toluene, methanol and water were added sequentially. Heat to 70° C., to mild reflux, and reflux under nitrogen atmosphere for 5 hours. Stop the reaction, after cooling to room temperature, use a rotary evaporator to spin off most of the solvent, add 300 ml of water, extract the aqueous phase with 150 ml of dichloromethane three times, dry the organic phase with anhydrous magnesium sulfate, and separate the crude product by column chromatography , the eluent was petroleum ether: ethyl acetate (8:1), and 1.50...

Embodiment 3

[0042] Embodiment 3-compound synthesis

[0043] In a 150ml round-bottomed bottle connected to a double row tube with a built-in magnet, add 4.44g (24.4mmol, 3eqv.) 2,5-dimethoxyphenylboronic acid, 2.00g (8.13mmol, 1.0eqv. .) p-dibromobenzene, 2.250g (1.218mmol, 0.15eqv.) tetrakistriphenylphosphine palladium and 4.49g (32.6mmol, 3.5eqv.) potassium carbonate, after changing the nitrogen four times, add the nitrogen drum in turn with a graduated cylinder After soaking in toluene, methanol and water. Heat to 120° C., to mild reflux, and reflux under nitrogen atmosphere for 24 hours. Stop the reaction, after cooling to room temperature, use a rotary evaporator to spin off most of the solvent, add 300 ml of water, extract the aqueous phase with 150 ml of dichloromethane three times, dry the organic phase with anhydrous magnesium sulfate, and separate the crude product by column chromatography , the eluent was petroleum ether: ethyl acetate (8:1), and 1.85g (72.9%) of pure product ...

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Abstract

The invention relates to a compound for the positive electrode material of a lithium ion battery, a preparation method and application. The compound is 1, 4-dibenzoquinonyl benzene. A precursor is obtained from 1, 4-dibromobenzene and 2, 5-dimethoxyphenylboronic acid under the catalytic action of tetrakis (triphenylphosphine) palladium; and the precursor compound is oxidized with ceric ammonium nitrate, so that a target product can be obtained. The raw materials in the reactions of the above two steps are cheap and easily available, and simple to synthesize; the yield of the compound is greater than 60%. The carbon composite electrode of the compound is used as the positive electrode of the lithium battery; under the current density of 0.1 C, the initial discharge capacity of the lithium battery reaches a theoretical value (370mAh / g), after 100 cycles, the actual specific capacity of the lithium battery is still 300mAh / g or above, and the retention rate of the lithium battery is about83.0%; the average discharge voltage of the lithium battery is 60 V; under the current density of 1C, the specific capacity of the lithium battery can reach 260mAh / g. Compared with that of a lithium battery with the capacity of 0.1 C, the retention rate of the lithium battery is about 70.3%.

Description

technical field [0001] The invention relates to a new organic cathode material for a lithium-organic battery, belonging to the technical field of electrochemical energy storage. In particular, it relates to a compound used for lithium-ion battery cathode materials, a preparation method and an application. Background technique [0002] As an energy storage device with the highest energy density, lithium-ion batteries have been widely used in all aspects of social life, especially in portable electronic products. The cathode materials currently used in lithium-ion batteries are metal oxides or phosphides, such as LiCoO 2 、LiFePO 4 And nickel-cobalt-manganese ternary materials, etc. With the rapid development of electric vehicles and smart grids, it is necessary to seek high-energy density and low-cost high-performance energy storage devices to meet market demand. In the large-scale use of lithium batteries, metal compounds have the disadvantages of high cost, high pressure...

Claims

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Application Information

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IPC IPC(8): H01M4/60H01M4/1399H01M4/62H01M10/0525
CPCH01M4/60H01M4/1399H01M4/622H01M4/625H01M4/62H01M10/0525H01M2004/028Y02E60/10
Inventor 杨继兴许运华石叶青孙鹏飞王撰平
Owner TIANJIN UNIV
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