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Lithium-pre-embedded hard carbon material, and preparation method and application thereof

A technology of pre-embedding lithium and hard carbon, which is applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problem of lower volume specific energy of capacitors, and achieve constant volume specific energy, short time consumption and cost saving Effect

Active Publication Date: 2018-01-30
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Similarly, this method is only applied to capacitors. In addition, in this method, there will be space left after the metal lithium is completely consumed, resulting in a decrease in the volume specific energy of the capacitor.

Method used

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  • Lithium-pre-embedded hard carbon material, and preparation method and application thereof
  • Lithium-pre-embedded hard carbon material, and preparation method and application thereof
  • Lithium-pre-embedded hard carbon material, and preparation method and application thereof

Examples

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preparation example Construction

[0032] A preparation method for pre-intercalated lithium hard carbon material, comprising the following steps:

[0033] S1. Mix the hard carbon active material, binder, and conductive agent, add a solvent and stir evenly to obtain a slurry, coat the slurry on a copper foil, and dry to obtain an initial hard carbon material;

[0034] S2. Under the protective atmosphere of inert gas, add electrolyte on the initial hard carbon material until the electrolyte wets the surface of the initial hard carbon material, and then completely cover the metal lithium sheet on the initial hard carbon material for pre-intercalation lithium reaction, after After a certain reaction time t, the metal lithium sheet is removed to obtain a pre-intercalated lithium hard carbon material, 0min<t≤120min.

Embodiment 1

[0036] Such as figure 1 As shown, the preparation method of a kind of pre-intercalated lithium hard carbon material of the present embodiment comprises the following steps:

[0037] S1. Preparation of initial hard carbon materials

[0038] Mix the hard carbon / graphene composite material as the active material, polyvinylidene fluoride (PVDF) as the binder, and acetylene black as the conductive agent in a mass ratio of 8:1:1, add N-methylpyrrolidone as the solvent, and stir evenly After the slurry is obtained, the slurry is coated on a copper foil with a thickness of 10 μm, and after drying, it is punched into a disc with a diameter of 12 mm, and the disc is placed in an oven at 110 ° C for 6 hours to obtain the initial hard carbon material;

[0039] In this embodiment, the hard carbon / graphene composite material is prepared by the following steps:

[0040] S1-1. Add 0.4g of graphene oxide and 2g of hard carbon prepared by the Hummers method to an aqueous solution of 100mL of ...

Embodiment 2

[0052] The preparation method of the pre-embedded lithium hard carbon material in this example is the same as that in Example 1, the difference is that:

[0053] The pre-intercalation lithium reaction time t in the step S2 is 30 min.

[0054] figure 2 Be the SEM figure of initial hard carbon material in the present embodiment, image 3 This is the SEM image of the pre-intercalated lithium hard carbon material in this example, which shows that an obvious porous solid electrolyte interface (SEI) film has been formed.

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Abstract

The invention discloses a preparation method of a lithium-pre-embedded hard carbon material. The preparation method includes S1, mixing a hard carbon active material with a binding agent and an electric-conducting agent, adding solvent to stir evenly to obtain thick liquid, spreading the thick liquid onto a copper foil, and drying the copper foil to obtain an initial hard carbon material; S2, in an inertia gas protection atmosphere, adding electrolyte onto the initial hard carbon material until the electrolyte immerses the surface of the initial hard carbon material, completely covering the initial hard carbon material with a metal lithium sheet I to allow lithium-pre-embedded reaction, and removing the metal lithium sheet I after a certain reaction time t to obtain the lithium-pre-embedded hard carbon material, wherein the t is longer than 0 minute but shorter than or equal to 120 minutes. The preparation method has the advantages of simplicity and convenience in operation, short duration, low cost, capability of improving first coulombic efficiency of high-negative-electrode materials and the like.

Description

technical field [0001] The invention relates to the field of hard carbon negative electrode materials for lithium ion batteries, in particular to a pre-embedded lithium hard carbon material and a preparation method and application thereof. Background technique [0002] Due to the high first-time irreversible capacity and low first-time Coulombic efficiency of the negative electrode material in lithium-ion batteries, after forming a battery with the positive electrode material, a part of lithium in the positive electrode material will inevitably be lost, resulting in the reversible capacity and energy of the lithium-ion battery. The density drops significantly. Therefore, it is of great significance to improve the first Coulombic efficiency of anode materials. [0003] In recent years, the method of pre-intercalating lithium in the negative electrode material is considered to be a method that can effectively solve this problem. At present, the methods for pre-intercalating l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/0525
CPCY02E60/10
Inventor 张翔范长岭韩绍昌
Owner HUNAN UNIV
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