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Lithium-phosphorus-oxygen-nitrogen modified silicon-carbon composite material and preparation method thereof

A silicon-carbon composite material, lithium phosphorus oxynitride technology, applied in the field of materials, can solve the problems of low initial charge and discharge efficiency, poor cycle life, etc., and achieve the effects of good electronic conductive network, improved electrical conductivity, and stable chemical properties

Inactive Publication Date: 2020-01-10
深圳市汇鑫利电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above technical problems, the present invention discloses a silicon-carbon composite material modified by lithium phosphorus, oxygen and nitrogen and its preparation method, which solves the technical problems of low initial charge and discharge efficiency and poor cycle life of the existing silicon carbon as the negative electrode material

Method used

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  • Lithium-phosphorus-oxygen-nitrogen modified silicon-carbon composite material and preparation method thereof
  • Lithium-phosphorus-oxygen-nitrogen modified silicon-carbon composite material and preparation method thereof
  • Lithium-phosphorus-oxygen-nitrogen modified silicon-carbon composite material and preparation method thereof

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preparation example Construction

[0034] Such as figure 1 As shown, a method for preparing a silicon-carbon composite material includes the following steps:

[0035] In step S01, firstly, the silicon powder and the silicon oxide powder are mixed by high-energy ball milling to obtain a mixed powder SiO x .

[0036] Step S02, the mixed powder SiO x After ball milling and mixing with a certain amount of lithium phosphate powder, a mixed precursor is obtained.

[0037] Step S03, sintering the mixed precursor in a nitrogen source atmosphere to obtain a modified precursor.

[0038] In step S04, an organic carbon source such as sucrose or citric acid is added to the modified precursor, and then sintering is performed in an argon-containing atmosphere to obtain an LPON modified silicon-carbon composite material.

[0039] Wherein, in step S01, the silicon powder and the silicon oxide powder are subjected to ball milling and mixing, on the one hand, the components are fully mixed, and on the other hand, the particles of each comp...

Embodiment 1

[0052] This embodiment provides a LPON modified silicon carbon composite material, which is prepared by the following steps:

[0053] S11: Mix and grind nanometer silicon powder and submicron silicon oxide powder according to the molar ratio of 1:1, and put them in a ball mill for high-energy ball milling after uniform grinding. The milling speed is set to 300r / min, and the milling conditions are Set to forward rotation for 1h, reverse rotation for 1h, ball milling time 8 hours, after ball milling, after grinding, pass through a 100-150 mesh screen to collect materials, and obtain mixed powder SiO x .

[0054] S12: Then the powder SiO will be mixed x It is ball-milled and mixed with a certain amount of lithium phosphate powder, specifically according to the mass ratio of 6:4. The speed of the ball milling is set to 300r / min, the conditions of the ball milling are set to forward rotation for 1h, reverse rotation for 1h, and the milling time is 8 hours. After the milling, the materia...

Embodiment 2

[0058] This embodiment provides a LPON modified silicon carbon composite material, which is prepared by the following steps:

[0059] S11: Mix and grind nanometer silicon powder and submicron silicon oxide powder according to the molar ratio of 1:1, and put them into a ball mill for high-energy ball milling. The speed of the ball milling is set to 300 r / min. The conditions are set to forward rotation for 1 hour, reverse rotation for 1 hour, and the ball milling time is 8 hours. After ball milling, the material is collected through a 100-150 mesh screen to obtain a mixed powder SiO x .

[0060] S12: Then the powder SiO will be mixed x It is ball-milled and mixed with a certain amount of lithium phosphate powder, specifically according to the mass ratio of 5:5. The speed of the ball milling is set to 300r / min, the conditions of the ball milling are set to forward rotation for 1h, reverse rotation for 1h, and the milling time is 8 hours. After the milling, the materials are collected ...

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Abstract

The invention provides a lithium-phosphorus-oxygen-nitrogen modified silicon-carbon composite material and a preparation method thereof. The preparation method comprises the following steps: ball-milling and mixing silicon powder and silicon monoxide powder to obtain mixed powder SiO<x>, x being larger than 0 and smaller than 2; ball-milling and mixing the mixed powder SiO<x> and lithium phosphatepowder to obtain a mixed precursor; sintering the mixed precursor in an atmosphere containing a nitrogen source to obtain a modified precursor; and adding an organic carbon source into the modified precursor, and carrying out sintering in an atmosphere containing argon to obtain the lithium-phosphorus-oxygen-nitrogen modified silicon carbon composite material. When used as a negative electrode ofa lithium ion battery, the silicon-carbon composite material obtained by adopting the technical scheme has low negative electrode resistance, high lithium ion conduction rate, high structure stability and high capacity retention ratio, and endows the lithium ion battery with high first-time charging and discharging efficiency, better cycle performance, long cycle life and higher safety performance.

Description

Technical field [0001] The invention belongs to the technical field of materials, and particularly relates to a lithium-phosphorus-oxy-nitrogen modified silicon-carbon composite material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used as a portable new energy source in many electronic product fields because of their safety, long service life, and convenience and portability. At present, the key research direction of anode materials for lithium-ion batteries is developing towards lithium battery materials with high specific capacity, large rate, high cycle performance and high safety performance. [0003] Silicon has an ultra-high theoretical capacity (4200 mAh / g) and a low delithiation potential ( <0.5 V) and is concerned. However, silicon-based anode materials have serious volume expansion. In the process of complete lithium insertion, the volume expansion rate can reach 300%. This will not only affect the crushing of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/134H01M10/0525
CPCH01M4/362H01M4/386H01M4/583H01M4/134H01M10/0525H01M2004/027Y02E60/10
Inventor 于朝明俞兆喆
Owner 深圳市汇鑫利电子科技有限公司
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