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Modified lithium-free negative electrode, preparation method thereof and lithium ion battery with modified lithium-free negative electrode

A lithium-ion battery and lithium negative electrode technology, applied in the field of nanomaterials, can solve the problems of high energy consumption, high production equipment requirements, and limited efficiency improvement of graphite negative electrodes, and achieve low energy consumption, low production equipment requirements, and improved circulation. The effect of stability

Inactive Publication Date: 2019-02-05
CHINA ENERGY CAS TECH CO LTD
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

However, the modified graphite prepared by this method needs to be sintered at a high temperature of 800°C-1000°C under the protection of an inert gas, so the requirements for production equipment are relatively high and energy consumption is large
In addition, this method of modifying graphite has a limited improvement in the first efficiency of graphite negative electrode, the highest is only 93.53%.

Method used

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  • Modified lithium-free negative electrode, preparation method thereof and lithium ion battery with modified lithium-free negative electrode
  • Modified lithium-free negative electrode, preparation method thereof and lithium ion battery with modified lithium-free negative electrode
  • Modified lithium-free negative electrode, preparation method thereof and lithium ion battery with modified lithium-free negative electrode

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preparation example Construction

[0029] In some embodiments, the carbon nanotube microspheres can be prepared by dispersing carbon nanotubes in a solvent to form a dispersion, and then spray drying. For example, the preparation method may include the following steps:

[0030] A, the carbon nanotubes are dispersed into a dispersion solvent (without surfactant) by ultrasonic treatment to obtain a dispersion;

[0031] B. The dispersion liquid obtained in step A is sprayed out through the nozzle of the spray dryer, the air inlet temperature and the air outlet temperature are preset, and the solution is kept in a stirring state during the spraying process;

[0032] C. cooling to obtain carbon nanotube microspheres.

[0033] In some embodiments, the solvent is an organic and / or inorganic liquid capable of uniformly dispersing carbon nanotubes / carbon nanofibers and nanocarbon particles, for example, water, ammonia water, hydrochloric acid solution, ethanol, acetone, isopropanol Any one or combination of more.

[...

specific Embodiment approach 1

[0067] Embodiment 1 is a modified lithium-free negative electrode of a lithium-ion battery, wherein the modified lithium-free negative electrode contains metal lithium-skeleton carbon composite material in addition to lithium-free negative electrode material, and the metal lithium-skeleton carbon composite material The content of the material is 2%-20% of the mass of the negative electrode active material in terms of mass percentage.

specific Embodiment approach 2

[0068] Embodiment 2 is the modified lithium-free negative electrode according to Embodiment 1, wherein the metal lithium-skeleton carbon composite material comprises a porous carbon material carrier and a metal present in the pores and on the surface of the porous carbon material carrier lithium.

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Abstract

The invention discloses a modified lithium-free negative electrode, a preparation method thereof and a lithium ion battery with the modified lithium-free negative electrode. The modified lithium-freenegative electrode is prepared from a lithium-free negative electrode material and a metal lithium-framework carbon composite material, wherein the content of the metal lithium-framework carbon composite material is 2 to 20 percent by mass of the negative electrode active material. In the first charging-discharging process of the battery, metal lithium in the metal lithium-framework carbon material can supplement lithium consumed by forming an SEI layer on the surface of the lithium-free negative electrode, so that the first charging-discharging efficiency of the lithium-free negative electrode is improved.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a modified lithium-free negative electrode, a preparation method thereof and a lithium ion battery containing the same. Background technique [0002] Lithium batteries have the characteristics of high energy density, good cycle stability and safety, and have been widely used in portable electronic devices, electric vehicles and grid energy storage. Graphite is a layered structure formed by stacking layers of network structures composed of six-membered carbon rings. This layered structure is conducive to the intercalation and deintercalation of lithium ions between the layers. When charging, lithium ions are inserted into the interlayers to form the compound LiC 6 , its theoretical specific capacity is 372mAh / g. In addition, the deintercalation reaction of lithium in graphite is around 0-0.25V, which has a good charge and discharge platform, and can be compatible with...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/134H01M4/66H01M10/0525
CPCH01M4/133H01M4/134H01M4/662H01M4/663H01M10/0525H01M4/36H01M4/66Y02E60/10
Inventor 陈鹏陈立桅卢威沈炎宾王亚龙郭峰康拓刘承浩
Owner CHINA ENERGY CAS TECH CO LTD
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