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Lithium battery negative electrode material, and preparation method of lithium battery applying lithium battery negative electrode material

A negative electrode material, lithium battery technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of unstable peel strength, lithium precipitation, etc., to avoid lithium precipitation problems, optimize battery performance, and improve negative electrode capacity. Effect

Pending Publication Date: 2022-01-28
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a lithium battery negative electrode material and its preparation method applied to a lithium battery, which overcomes the defect that lithium-based lithium-ion battery graphite-based negative electrode materials are prone to lithium precipitation during high-current charging and discharging, and at the same time solves the problem of coating Unstable peel strength caused by adhesive migration to the surface during the drying process when using a thicker negative electrode material

Method used

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  • Lithium battery negative electrode material, and preparation method of lithium battery applying lithium battery negative electrode material
  • Lithium battery negative electrode material, and preparation method of lithium battery applying lithium battery negative electrode material
  • Lithium battery negative electrode material, and preparation method of lithium battery applying lithium battery negative electrode material

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Embodiment 1

[0032] See figure 1 , a preparation method of a lithium battery negative electrode material, comprising the following steps:

[0033] (1) Pretreatment of carbon-based materials: soak carbon-based materials in acetone for 3 hours at room temperature, filter and wash with deionized water for 5 times, dry at 60°C in an inert gas, and then put them in an oxidant Reflux, control the reflux temperature at 60°C; take out the carbon-based material after 3 hours, wash the carbon-based material with 0.1mol / L hydrochloric acid until neutral, and finally fully dry it in a vacuum oven at 80°C to obtain activated carbon-based Material;

[0034] (2), the activated carbon-based material prepared in step (1) together with the transition metal ion salt Zn(NO 3 ) 2 ·6H 2O. The multidentate organic ligand HBDC is added to N,N-dimethylformamide DMF that has been dehydrated by molecular sieves and mixed evenly, and then 99.999% high-purity argon gas is introduced at a speed of 0.5L / min for 3 ho...

Embodiment 2

[0041] A kind of preparation method of lithium battery negative electrode material is consistent with embodiment 1, just the transition metal ion salt Zn(NO in step (2) 3 ) 2 ·6H 2 Replace O with Cu(NO 3 ) 2 ·6H 2 O, Cu-MOF@C composites were finally prepared.

[0042] The method for preparing the lithium battery from the negative electrode material of the lithium battery is completely consistent with that in Example 1.

Embodiment 3

[0044] A kind of preparation method of negative electrode material of lithium battery and the preparation method of lithium battery are completely consistent with embodiment 1, just in step (c), negative pole piece is 30g·m together with areal density -2 , The compacted density is 3.5g·cm -3 The NCM811 ternary material positive pole piece, PP dry-process separator and electrolyte complete the assembly of the square shell lithium-ion battery.

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Abstract

The invention discloses a lithium battery negative electrode material, and a preparation method of a lithium battery applying the lithium battery negative electrode material. The preparation method comprises the following steps: firstly, activating a carbon-based material, then preparing an MOF@C composite material from the carbon-based material, a transition metal ion salt and a polydentate organic ligand by using a hydrothermal method, then proportioning the MOF@C composite material and a binder into negative electrode slurry with different binder contents, carrying out multilayer coating according to a sequence that the concentration of the binder is gradually reduced from the inner layer to the outer layer by adopting a slit type extrusion coating method so as to prepare a negative electrode piece, and finally assembling the negative electrode piece into the corresponding lithium battery. According to the prepared MOF@C composite material, the electrical conductivity is improved while the advantages of MOF are reserved, and active sites in the charging and discharging process are increased; and the multilayer coating mode is adopted to compensate for the influence caused by migration of the binder to the surface in the drying process, the peeling strength of the negative electrode material on the foil is effectively improved, meanwhile, preparation of a thick electrode is facilitated, and then the negative electrode capacity is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a lithium battery negative electrode material and a preparation method thereof applied to lithium batteries. Background technique [0002] As an electrochemical storage method with great development potential nowadays, lithium-ion batteries have further become a research hotspot. [0003] Lithium-ion batteries have gradually penetrated into every aspect of life, ranging from small electronic products to heavy machinery such as ships and cranes. With the gradual heating up of application scenarios such as electric vehicles and energy storage batteries, higher requirements are placed on batteries, among which the continuous optimization of consistency, safety, rate performance, and long life is particularly important. The key to improving these performances is to develop positive and negative materials for lithium-ion batteries that can reversibly and quickly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393H01M4/36H01M10/0525
CPCH01M4/1393H01M4/133H01M4/366H01M10/0525H01M2004/027Y02E60/10
Inventor 董骄曹勇王义飞苏峰马仁良项胜
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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