Nanomaterial for negative electrode protection layer, negative electrode protection slurry, lithium negative electrode and lithium battery

A technology of nanomaterials and protective layers, applied in nanotechnology for materials and surface science, lithium batteries, nanotechnology, etc., can solve problems such as uneven deposition of lithium on lithium anodes, improve lithium affinity, and relieve lithium branches. The generation of crystals and the uniform effect of lithium deposition

Active Publication Date: 2022-05-17
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned defects or deficiencies in the prior art, the present application expects to provide a nano-material for the negative electrode protective layer, a negative electrode protective slurry, a lithium negative electrode and a lithium battery, in order to solve the problem of the existing lithium negative electrode by improving the lithium affinity of the negative electrode. The problem of uneven lithium deposition, thus effectively stabilizing the lithium negative electrode

Method used

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  • Nanomaterial for negative electrode protection layer, negative electrode protection slurry, lithium negative electrode and lithium battery
  • Nanomaterial for negative electrode protection layer, negative electrode protection slurry, lithium negative electrode and lithium battery
  • Nanomaterial for negative electrode protection layer, negative electrode protection slurry, lithium negative electrode and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] (1) Preparation of nanomaterials

[0079] ① Preparation of iron-containing precursor:

[0080] 116mg FeCl 3 ·6H 2 O and 270mg terephthalic acid were added in 5mL dimethylformamide (DMF) to form a mixed solution, wherein 0.8mol sodium hydroxide was contained in the dimethylformamide;

[0081] Transfer the mixed solution to a reaction kettle and heat it up to 100°C at a heating rate of 5°C / min, and keep the reaction at this temperature for 12 hours, then vacuum dry to obtain the crude product;

[0082] Wash the crude product several times with ethanol, then disperse the crude product in ethanol, maintain it at 70°C for 3 hours, and dry it in vacuum to obtain the crude product, which is the iron-containing precursor;

[0083] ②Add 1.5g of ultrasonically dispersed graphene and 1.5g of the prepared precursor into 30mL of deionized water, stir and react for 24 hours, and then remove the solvent by rotary evaporation to obtain powder;

[0084] ③The powder obtained in step ...

Embodiment 2

[0092] The lithium battery was prepared according to the method of Example 1, except that the preparation process of the nanomaterials was different so that the thickness of the carbon layer shell of the nanomaterials, the size of the outer diameter of the core and the size of the inner diameter of the inner core were different.

[0093] The preparation of nanomaterials in this embodiment is as follows:

[0094] ① Preparation of iron-containing precursor:

[0095] 120mg FeCl 3 ·6H 2 O and 250mg terephthalic acid are added in 5mL dimethylformamide (DMF) to form a mixed solution, wherein, 0.8mol sodium hydroxide is contained in the dimethylformamide;

[0096] Transfer the mixed solution to a reaction kettle and heat it up to 100°C at a heating rate of 5°C / min, and keep the reaction at this temperature for 12 hours, then vacuum dry to obtain the crude product;

[0097] Wash the crude product several times with ethanol, then disperse the crude product in ethanol, maintain it at...

Embodiment 3

[0102] Lithium batteries were prepared according to the method of Example 1, the difference being that the preparation process of the nanomaterials was different so that the thickness of the carbon layer shell of the nanomaterials was different:

[0103] The preparation of the nanomaterial is as follows:

[0104] Similar to the preparation method of nanomaterials in Example 1, the amount of graphene and iron-containing precursors in step ② is set to 2.5g and 1.5g, and the final product is collected after the reaction. After identification, the carbon layer shell of the resulting nanomaterials It consists of 5-7 carbon layers, the thickness of the carbon layer shell is 12nm, the outer diameter of the inner core is 45nm, and the inner diameter of the inner core is 5.4nm.

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Abstract

The invention discloses a nanometer material for a negative electrode protection layer, negative electrode protection slurry, a lithium negative electrode and a lithium battery. The nanometer material comprises an inner core and a carbon layer shell covering the surface of the inner core, and a cavity is formed between the inner core and the carbon layer shell; wherein the inner core is transition metal carbide nano-particles or transition metal sulfide nano-particles, and the inner core is of a hollow spherical structure. The nanometer material can form a protective layer on the surface of a lithium negative electrode in situ, and the lithium affinity can be improved and the lithium deposition is more uniform through the synergistic effect between the inner core and the carbon layer shell, so that the lithium negative electrode is effectively stabilized, the side reaction is reduced, the generation of lithium dendrites is relieved, the coulombic efficiency of a lithium battery is improved, and the cycle life of the lithium battery is prolonged.

Description

technical field [0001] The present application generally relates to the field of battery technology, and specifically relates to a nanomaterial used for a negative electrode protective layer, a negative electrode protective slurry, a lithium negative electrode, and a lithium battery. Background technique [0002] Batteries using metallic lithium as the negative electrode have attracted much attention because of their considerably higher energy density than conventional lithium-ion batteries. However, there are the following problems in its use: 1) the formation of lithium dendrites in the metal lithium anode is easy to cause short circuit of the battery during the cycle charge and discharge process; 2) the generation of SEI film causes dead lithium to be generated, resulting in low coulombic efficiency. [0003] At present, the above problems are solved by setting a protective layer on the lithium negative electrode. The materials forming the protective layer include carbon ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/058H01M10/052H01M4/13B82Y40/00B82Y30/00
CPCH01M10/4235H01M4/13H01M10/058H01M10/052B82Y30/00B82Y40/00Y02P70/50Y02E60/10
Inventor 张露露何科峰
Owner BYD CO LTD
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