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Lithium ion battery negative electrode composite material and preparation method thereof

A lithium-ion battery and composite material technology, which is applied in the field of lithium-ion battery negative electrode composite materials and its preparation, can solve problems such as restricting the effective application of red phosphorus negative electrodes, high energy consumption by mechanical ball milling, and unfavorable mass production, etc. The effect of electrical conductivity, low cost, and stable structure

Active Publication Date: 2021-12-24
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the energy consumption of the mechanical ball milling method is too high and it is difficult to realize the nanometerization of red phosphorus. Although the sublimation-condensation method can realize the nanometerization of red phosphorus by combining with the carbon matrix, there are certain safety hazards in the process. Good for mass production
These problems seriously restrict the effective application of red phosphorus anode

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A porous carbon-coated mesoporous red phosphorus composite material, such as figure 1 As shown, the composite material is composed of multiple spherical nano-scale red phosphorus@carbon primary particles superimposed into micron-scale spherical secondary particles. The nano-scale red phosphorus@carbon primary particle is a carbon layer uniformly coated on the surface of the nano-red phosphorus particle The carbon layer has a porous structure, the nano red phosphorus particles have a mesoporous structure, and there is a gap microstructure between the carbon layer and the nano red phosphorus particles. Its preparation method is as follows:

[0027] Grind 400 mg of micron-sized red phosphorus for 20 minutes, put it into a closed reactor, add 25 mL of propylenediamine and 5 mL of ethylene glycol, and ultrasonicate for 30 minutes; put it in a constant temperature box for 24 hours at 200 ° C, cool to room temperature after the reaction, and let it stand , centrifugation, was...

Embodiment 2

[0030] Same as the above Example 1, the difference is that its preparation method is as follows: take 400mg of micron-sized red phosphorus and grind it for 20min, put it into a closed reactor, add 25mL of butanediamine and 5mL of propylene glycol, and sonicate for 30min; put it in a constant temperature box at 250°C React for 12 hours. After the reaction, cool to normal temperature, let stand, centrifuge, and dry to obtain mesoporous nano red phosphorus particles. Mix 300mg of nano-red phosphorus particles with 250mg of glucose and 2.5mg of nickelocene, and emulsify through high-speed shearing to prepare an emulsion; the emulsion is spray-dried (200°C) to obtain a material precursor; the precursor is placed in a nitrogen-filled The porous carbon-coated mesoporous nano-red phosphorus composite material A2 was obtained by treating in a closed quartz tube at 350°C for 2 hours. The content of red phosphorus in the composite material was determined to be about 75%. The composite ma...

Embodiment 3

[0032] Grind 400mg of micron-sized red phosphorus for 20 minutes, put it into a closed reactor, add 25mL of hexamethylenediamine and 5mL of ethylene glycol, and sonicate for 30 minutes; put it in a thermostat for 36 hours at 150°C, cool to room temperature after the reaction, and let it stand , centrifuging and drying to obtain mesoporous nanometer red phosphorus particles. Mix 300mg of nano-red phosphorus particles with 350mg of polypyrrole and 7mg of ferrocene, and emulsify through high-speed shearing to prepare an emulsion; the emulsion is spray-dried (120°C) to obtain a material precursor; the precursor is placed in a nitrogen-filled The porous carbon-coated mesoporous nano-red phosphorus composite material A3 was obtained by treating in a closed quartz tube at 300°C for 8 hours. The content of red phosphorus in the composite material was determined to be 75%. The composite material was smeared to prepare an electrode, which was assembled with a lithium sheet to form a hal...

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Abstract

The invention discloses a lithium ion battery negative electrode composite material and a preparation method thereof. The composite material is characterized in that a plurality of spherical nanoscale red phosphorus@carbon primary particles are superposed and combined into micron-sized spherical secondary particles, and the nanoscale red phosphorus@carbon primary particles are porous carbon layers uniformly coated on the surfaces of mesoporous nanoscale red phosphorus particles. The preparation method comprises the steps of uniformly mixing commercial red phosphorus, organic amine and an alcohol additive, and reacting under certain process conditions to obtain mesoporous nano red phosphorus particles; mixing the mesoporous nano red phosphorus, an organic carbon source and a carbonizer, and carrying out high-speed shearing emulsification to prepare an emulsion; and carrying out spray drying treatment on the emulsion, putting the emulsion into a closed quartz tube filled with inert gas, and carrying out low-temperature roasting treatment to obtain the composite material. The composite material has the advantages that the pore structure of the composite material can effectively buffer volume expansion of red phosphorus, avoid pulverization of an electrode material and increase the contact area of the red phosphorus, a conductive material and an electrolyte, the composite material has relatively high red phosphorus content and tap density, and the energy density of the battery is improved.

Description

technical field [0001] The invention relates to a lithium ion battery material, in particular to a lithium ion battery negative electrode composite material and a preparation method thereof. Background technique [0002] The rapid development of new energy vehicles and portable electronic products has made the industry put forward higher requirements for the performance of lithium-ion batteries. Positive and negative electrode materials are the key to the electrochemical performance of batteries. In recent years, the research on positive electrode materials has made great progress. The development of new negative electrode materials with high specific capacity and long life has become the key to breaking through the technical bottleneck of the new generation of lithium-ion batteries. Red phosphorus has a theoretical capacity of up to 2600mAh·g -1 It is considered to be a promising anode material for lithium-ion batteries. Moreover, red phosphorus has the advantages of chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525C01B25/00C01B32/05
CPCH01M4/366H01M4/5805H01M4/583H01M10/0525C01B25/003C01B32/05H01M2004/027Y02E60/10
Inventor 隋裕雷伍凌张晓萍
Owner SUZHOU UNIV
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