Lithium battery negative electrode material and preparation method thereof

A negative electrode material, lithium battery technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., to shorten the preparation period, avoid electrode crushing, and improve cycle stability.

Active Publication Date: 2016-11-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the technical problems existing in the existing transition metal oxide electrode materials, and provides a method of preparing carbon@transition metal oxide@carbon composite nanofibers (C@ MO x @C) Methods of lithium-ion battery anode materials

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Stir and mix 5 parts of collagen fibers and 400 parts of deionized water evenly, adjust the pH of the system to 1.5-2.0, add titanium sulfate and stir for 4 h, wherein Ti 4+ The content is 40% of the collagen fiber mass. Subsequently, the pH of the system was adjusted to 5.0–5.5, and the temperature was raised to 45 ºC to continue the reaction for 6 h. After the reaction was completed, it was filtered, washed, and dried to obtain collagen fiber-loaded Ti (CF@Ti); the obtained CF@Ti was added to Stir and mix 400 parts of deionized water evenly, then add 0.1 part of bayberry tannin, and stir and react at room temperature for 4 h, filter, wash, and dry; the obtained solid powder is carbonized at high temperature for 3 h under vacuum conditions, and the carbonization temperature is 800 ºC, you can get C@TiO 2 @C.

[0045] Depend on figure 1 It can be seen that C@TiO 2 @C has TiO 2 Typical (311), (400) and (511) crystal plane diffraction peaks.

[0046] Depend on fig...

Embodiment 2

[0052] Stir and mix 5 parts of collagen fibers with 350 parts of deionized water, adjust the pH of the system to 1.5~2.0, and then add SnCl 4 ·5H 2 O stirred the reaction for 4 h, where Sn 4+The dosage is 20% of the collagen fiber mass. Subsequently, the pH of the system was adjusted to 3.5-4.0, and the temperature was raised to 40 ºC to continue the reaction for 6 h. After the reaction was completed, it was filtered, washed, and dried to obtain collagen fiber-loaded Sn (CF@Sn); 0.005 parts of bayberry tannin was dissolved In 50 parts of deionized water, add 1 part of CF@Sn to the above tannin solution, and continue to stir and react at room temperature for 4 h, filter, wash, and dry; the obtained solid powder is carbonized at high temperature for 2 h under vacuum conditions , the carbonization temperature is 500 ºC, and the C@SnO 2 @C.

[0053] The resulting C@SnO 2 @C was assembled into a coin cell as the working electrode, and its cycle stability was tested on a charge...

Embodiment 3

[0055] After stirring and mixing 5 parts of collagen fibers with 350 parts of deionized water, adjust the pH of the system to 1.5~2.0, and then add SnCl 4 ·5H 2 O stirred the reaction for 4 h, where Sn 4+ The dosage is 30% of the collagen fiber mass. Subsequently, the pH of the system was adjusted to 3.5-4.0, and the temperature was raised to 40 ºC to continue the reaction for 6 h. After the reaction was completed, it was filtered, washed, and dried to obtain collagen fiber-loaded Sn (CF@Sn); 0.025 parts of myricetin was dissolved In 50 parts of deionized water, add 1 part of CF@Sn to the above tannin solution, and continue to stir and react at room temperature for 4 h, filter, wash, and dry; the obtained solid powder is carbonized at high temperature for 2 h under vacuum conditions , the carbonization temperature is 500 ºC, and the C@SnO 2 @C.

[0056] The resulting C@SnO 2 @C was assembled into a button battery as the working electrode, and the cycle performance was tes...

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Abstract

The invention provides a method for preparing a lithium battery negative electrode material with collagenous fiber and plant polyphenol as a biological template and a carbon source. The preparation method comprises the following steps that 1, collagenous fiber and transition metal ions react to prepare collagenous fiber loaded transition metal ions; 2, plant polyphenol is utilized for carrying out surface coating modification on the collagenous fiber loaded transition metal ions; 3, high-temperature carbonization treatment is carried out. The prepared material is black powder in appearance, and is a nanometer fiber bundle with the diameter larger than or equal to 1 micrometer composed of carbon-transition metal oxide-carbon nanofiber with the diameter of 10-150 nm. When used as the lithium battery negative electrode material, the carbon coating layer and the carbon nanofiber skeleton of composite nanofiber can form a conductive network, the transition metal oxide can be prevented from being smashed in charging-discharging circulation, the circulation stability can be improved, the excellent conductivity can be provided, and the excellent rate capability is given for the electrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium battery negative electrode materials and their preparation, and specifically relates to a carbon@transition metal oxide@carbon composite nanofiber (C@MO) prepared by using natural collagen fibers and plant polyphenols as biological templates and carbon sources x @C) Lithium-ion battery anode material and its preparation method. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, long service life, good safety performance, no memory effect, green and pollution-free, and short charging time, so they are widely used in mobile devices, emergency power systems, and hybrid electric vehicles. In lithium-ion batteries, the electrode material determines the performance of the lithium battery. At present, commercial lithium-ion batteries mainly use graphite as the negative electrode material, but the theoretical lithium storage capacity provided by graphite is o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/48H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/48H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 黄鑫王晓玲石碧廖学品
Owner SICHUAN UNIV
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