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Lithium ion battery negative electrode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc. Membrane breakage and other problems, to achieve the effect of suppressing expansion, increasing the contact area, and simplifying the method

Active Publication Date: 2021-11-09
HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent publication with the application number "201910158874.2" and the title "A Hollow Sandwich SiO2 / C / MoS2 Hybrid Microsphere for Lithium-ion Battery Anode Material" A hollow sandwich structure hybrid microsphere with SiO2 as the inner layer, carbon layer as the middle layer, and MoS2 as the outer layer was developed. The disadvantage of this material is that On the one hand, it is silicon dioxide obtained by hydrolysis of ethyl orthosilicate, resulting in the ratio between silicon dioxide and carbon, MoS2 is not adjustable, the performance of the final product is difficult to meet the needs On the other hand, it has been reported that SiO2 can generate Li2SiO3 or Li in the battery reaction 4SiO4, but irreversible, its existence mainly plays a buffer role, and the effect of improving battery performance is not significant
[0004]The theoretical specific capacity of silicon is 4200mAh / g, and it is abundant in the earth's crust, low in cost, and environmentally friendly, so silicon is the most potential new negative electrode material However, the huge volume expansion (~300%) of silicon during charge and discharge will lead to the pulverization of particles and the damage of SEI film, which seriously affects the cycle stability of the battery.

Method used

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  • Lithium ion battery negative electrode material and preparation method thereof
  • Lithium ion battery negative electrode material and preparation method thereof
  • Lithium ion battery negative electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] A lithium ion battery anode material preparation method, including the steps of:

[0022] (1) 1 g of the block copolymer F127, 1.5 g of a dopamine is dissolved in 50 mL of deionized water and 50 mL of ethanol, and the stirring is continuously stirred at room temperature to become a colorless clarified solution, and 2 ml1 is added to the solution. 3,5-trimethylbenzene, adding ammonia water to adjusting pH of 8, continuous reactions for 4 h, centrifugation, centrifugation, centrifugation with water and ethanol 5 times, last at 60 ° C vacuum ovens for 12 h, resulting in polybatamine nano Microspheres.

[0023] (2) 50 mg of the resulting polyopaline nanopospheres were dispersed in a dispersion of 30 ml of deionized water and 30 ml of ethanol, then 200 mg of sodium molybdate and 200 mg of thiourea were mixed to uniformly gave a mixed liquid, then transfer the mixture to In the 100 ml tetrafluoroethylene lined stainless steel autoclave, the black product was collected at 200 ° C,...

Embodiment 2

[0028] (1) 1 g of the block copolymer F127, 1.5 g of a dopamine is dissolved in 50 mL of deionized water and 50 mL of ethanol, and the stirring is continuously stirred at room temperature to become a colorless clarified solution, and 2 ml1 is added to the solution. 3,5-trimethylbenzene, the addition of ammonia water regulates the pH of 8. After the reaction is reacted for 4 h, the black product was centrifuged, washed with water and ethanol multiple centrifugation 3-5 times, and finally dried in a vacuum oven at 60 ° C. Get polybatamine nano microspheres.

[0029](2) 50 mg of the resulting polyopaline nanopospheres were dispersed in a dispersion of 30 ml of deionized water and 30 ml of ethanol, then 200 mg of sodium molybdate and 200 mg of thiourea were mixed to uniformly gave a mixed liquid, then transfer the mixture to In the 100 ml tetrafluoroethylene lined stainless steel autoclave, the black product was collected at 200 ° C, and the black product was centrifuged, washed with ...

Embodiment 3

[0032] (1) 1 g of the block copolymer F127, 1.5 g of a dopamine is dissolved in 50 mL of deionized water and 50 mL of ethanol, and the stirring is continuously stirred at room temperature to become a colorless clarified solution, and 2 ml1 is added to the solution. 3,5-trimethylbenzene, the addition of ammonia water regulates the pH of 8. After the reaction is reacted for 4 h, the black product was centrifuged, washed with water and ethanol multiple centrifugation 3-5 times, and finally dried in a vacuum oven at 60 ° C. Get polybatamine nano microspheres.

[0033] (2) 50 mg of the resulting polyopaline nanopospheres were dispersed in a dispersion of 30 ml of deionized water and 30 ml of ethanol, then 200 mg of sodium molybdate and 200 mg of thiourea were mixed to uniformly gave a mixed liquid, then transfer the mixture to In the 100 ml tetrafluoroethylene lined stainless steel autoclave, the black product was collected at 200 ° C, and the black product was centrifuged, washed with...

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Abstract

The invention discloses a lithium ion battery negative electrode material and a preparation method thereof, and the preparation method of the material is as follows: firstly, synthesizing polydopamine nano-microspheres by a nano-emulsion assembly method, and then uniformly coating molybdenum disulfide nanosheets on the surfaces of the polydopamine nano-microspheres by hydrothermal reaction; preparing molybdenum disulfide / polydopamine derived carbon microspheres (MoS2 / C composite material) through a high-temperature calcination process; and finally, mixing and grinding the MoS2 / C composite material and nano silicon according to a certain ratio to obtain a final product. The preparation method disclosed by the invention is simple and environment-friendly, and the prepared negative electrode material has high capacity, long circulation and excellent conductivity; and besides, according to the scheme, the mixing ratio of the MoS2 / C composite material to the nano silicon can be accurately regulated and controlled by controlling the adding amount of the nano silicon, so that a slave product with optimal performance is obtained.

Description

Technical field [0001] The present invention belongs to the technical field of lithium ion battery materials, and more particularly to a lithium ion battery anode material and a preparation method thereof. Background technique [0002] It is well known that lithium-ion batteries (LIBS) are one of the important energy storage systems for portable electronic devices and electric vehicles. In the past few decades, the lithium-ion battery has been widely concerned due to the continuous increase in energy consumption and energy storage demand. Graphite has the advantages of environmentally friendly, low cost, low cycle stability, is a standard commercial negative material for lithium-ion batteries, but its relatively low theoretical capacity (372mAh · g) -1 ) Has hindered the application of LIBS in high energy systems. Therefore, high-energy electrode materials develop high-energy density and high circulation stability have become a priority of portable electronics and even electric v...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/0525B82Y40/00B82Y30/00
CPCH01M4/362H01M4/386H01M4/5815H01M4/62H01M4/625H01M4/628H01M10/0525B82Y40/00B82Y30/00Y02E60/10
Inventor 徐懋饶媛媛姚停李献帅
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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