Negative electrode material for high-specific-power lithium ion battery as well as preparation and application thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problem of low initial efficiency and achieve high rate performance, high initial efficiency, and high comprehensive performance.

Active Publication Date: 2021-06-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the larger layer spacing makes the material have a lower first-time efficiency (70%)

Method used

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  • Negative electrode material for high-specific-power lithium ion battery as well as preparation and application thereof
  • Negative electrode material for high-specific-power lithium ion battery as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Mix fluorinated graphene (F:C=0.2) and hard carbon into a dopamine tris buffer solution with a pH of 9.4 according to a mass ratio of 2.5:97.5, and a dopamine concentration of 2%. After stirring for 3 hours, filter and wash until the pH= 7 until neutral, dry, and calcined at a temperature of 1000°C in an argon atmosphere for 24 hours, and cool naturally to prepare the electrode material. The F:C molar ratio in the fluorinated graphene is 0.3. The fluorinated graphene accounts for 10% of the total weight of the composite negative electrode material, which is used to further test the first efficiency and rate performance, which are recorded in Table 1.

[0026] figure 1 Electron micrograph for the negative electrode material prepared in Example 1. It can be seen from the figure that the negative electrode material of the present invention uses fluorinated graphene as the shell and hard carbon as the core. The structure of hard carbon in the negative electrode material i...

Embodiment 2

[0032] Mix fluorinated graphene (F:C=0.1) and hard carbon into a dopamine tris buffer solution with a pH of 9.2 at a mass ratio of 5:95, and a dopamine concentration of 1.5%. After stirring for 3 hours, filter and wash until the pH= 7 until neutral, dry, and calcined at a temperature of 1200°C in an argon atmosphere for 36 hours, and cool naturally to prepare the electrode material. The F:C molar ratio in the fluorinated graphene is 0.4. The fluorinated graphene accounts for 10% of the total weight of the composite negative electrode material, which is used to further test the first efficiency and rate performance, which are recorded in Table 1.

[0033] The hard carbon structure in the negative electrode material is characterized by interlayer spacing in the range of 0.40nm. The fluorinated graphene sheet has 6 layers, and the thickness of the shell composed of fluorinated graphene is 150nm.

Embodiment 3

[0035] Mix fluorinated graphene (F:C=0.5) and hard carbon into a dopamine tris buffer solution with a pH of 9.4 according to a mass ratio of 2.5:97.5, and a dopamine concentration of 2%. After stirring for 3 hours, filter and wash until the pH= 7 until neutral, dry, and calcined at a temperature of 1000°C in an argon atmosphere for 24 hours, and cool naturally to prepare the electrode material. The F:C molar ratio in the fluorinated graphene is 0.5. The fluorinated graphene accounts for 10% of the total weight of the composite negative electrode material. For further testing the first efficiency and rate performance, recorded in Table 1.

[0036] The hard carbon structure in the negative electrode material is characterized by interlayer spacing in the range of 0.40nm. The fluorinated graphene sheet is 4 layers, and the thickness of the shell composed of fluorinated graphene is 20nm.

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Abstract

The invention provides a negative electrode material for a high-specific-power lithium ion battery as well as a preparation method and application of the negative electrode material. The negative electrode material for the battery is of a core-shell structure; the internal core has a hard carbon structure characteristic, and the external shell has a fluorinated graphene structure characteristic; the battery negative electrode material is a micron-scale particle formed by tightly combining the inner part and the outer part. A hard carbon structure is arranged inside, and a fluorinated graphene structure is arranged on the surface; and the internal interlayer spacing is large and the surface interlayer spacing is small. The rapid charge-discharge inside the electrode can be met, the compact solid electrolyte interface film outside the negative electrode can be achieved; and the solid electrolyte interface film formed by the participation of the fluorine atoms in the fluorinated graphene has the lithium ion transmission low interface impedance so as to achieve the high rate performance of the negative electrode material.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a negative electrode material for high specific power lithium ion batteries and a preparation method thereof. Background technique [0002] As the current mainstream secondary battery technology, lithium-ion batteries have been widely used in industries such as consumer electronics, electric vehicles, and large-scale energy storage, and have greatly improved human life. As the application environment changes, lithium-ion batteries are increasingly required to have fast charge and discharge capabilities, such as start-stop batteries for automobiles, high-speed rail, and subways, and drone model batteries. [0003] Rapid charge and discharge performance requires lithium-ion batteries to complete electrochemical reactions in a very short time. Therefore, the requirements for electron and ion transmission are very high, especially the transmission speed of lithium io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M10/0525
CPCH01M4/366H01M4/583H01M4/5835H01M10/0525H01M2004/027Y02E60/10
Inventor 曲超张洪章李先锋刘翠连张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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