Lithium battery electrode and preparation method and application thereof

A lithium battery and electrode technology, applied in the field of energy storage, can solve problems such as the safety and stability of lithium batteries

Pending Publication Date: 2022-04-22
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, provide a lithium battery electrode and its preparation method and application, to solve the safety and stability problems of lithium batteries in the prior art

Method used

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  • Lithium battery electrode and preparation method and application thereof
  • Lithium battery electrode and preparation method and application thereof
  • Lithium battery electrode and preparation method and application thereof

Examples

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preparation example Construction

[0031] A method for preparing a lithium metal negative electrode with uniform lithium ion distribution artificial SEI, comprising the following steps:

[0032] Step 1, synthesis of TAPT-DHTA-COF: 2-4,6-tris(4-aminophenyl)-1,3,5-triazine and 2,5-dihydroxy-1,4-benzenedicarbaldehyde According to the molar ratio of 1:(1~2), preferably 1:1-1:1.5, suspended in anhydrous N,N-dimethylformamide solution under nitrogen atmosphere, 2-4,6-tri( The total molar amount of 4-aminophenyl)-1,3,5-triazine and 2,5-dihydroxy-1,4-benzenedicarbaldehyde and the volume ratio of anhydrous N,N-dimethylformamide solution 5mmol: (15-20)mL, heat and reflux at >120°C for 8-15h, cool to room temperature, filter the crude product, wash with N,N-dimethylformamide and ethanol to obtain a red powder, which is TAPT -DHTA-COF;

[0033] Step 2, the synthesis of Nafion-Li: LiOH·H 2 O added (5wt%) Nafion solution, LiOH·H 2 The molar ratio of O and Nafion solution is 1:1, and the lithiation is completed under vigo...

Embodiment 1

[0042] A method for preparing a lithium battery negative electrode with uniform lithium ion distribution artificial SEI layer, comprising the following preparation steps:

[0043] 1) Synthesis of TAPT-DHTA-COF: 2-4,6-tris(4-aminophenyl)-1,3,5-triazine (0.71g, 2.00mmol) and 2,5-dihydroxy-1 , 4-Phenylenedicarbaldehyde (0.42 g, 3.00 mmol) was suspended in anhydrous N,N-dimethylformamide solution (15 mL) under nitrogen atmosphere. The mixture was refluxed for 12 hours at 130°C. After cooling to room temperature, the crude product was filtered and washed with N,N-dimethylformamide and ethanol to obtain a red powder;

[0044] 2) Synthesis of Nafion-Li: Add 25.2mg LiOH·H2O into 10mL Nafion suspension (5wt%), stir vigorously at 100°C for 6h to complete lithiation. Then, the Nafion-Li solution was frozen with liquid nitrogen for 10 minutes until the freezing was complete, and then the sample was placed in a freeze dryer and freeze-dried for 12 hours under negative atmospheric pressur...

Embodiment 2

[0057] A method for preparing a lithium battery negative electrode with uniform lithium ion distribution artificial SEI layer, comprising the following preparation steps:

[0058] 1) Synthesis of TAPT-DHTA-COF: 2-4,6-tris(4-aminophenyl)-1,3,5-triazine (0.71g, 2.00mmol) and 2,5-dihydroxy-1 , 4-Phenylenedicarbaldehyde (0.42 g, 3.00 mmol) was suspended in anhydrous N,N-dimethylformamide solution (15 mL) under nitrogen atmosphere. The mixture was refluxed for 8 hours at 130°C. After cooling to room temperature, the crude product was filtered and washed with N,N-dimethylformamide and ethanol to obtain a red powder;

[0059] 2) Synthesis of Nafion-Li: 25.2mg LiOH·H 2 O was added to 10 mL of Nafion suspension (5 wt %), and vigorously stirred at 100 °C for 6 h to complete lithiation. Then, the Nafion-Li solution was frozen with liquid nitrogen for 10 minutes until the freezing was complete, and then the sample was placed in a freeze dryer and freeze-dried for 12 hours under negativ...

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Abstract

The invention discloses a lithium battery electrode and a preparation method and application thereof, the lithium battery electrode takes a lithium-loving covalent organic framework (COF) with a triazine ring and carbonyl as a multifunctional artificial SEI layer of a lithium metal battery (LMB), so that smooth deposition of lithium and formation of less lithium dendrites are ensured. Nafion-Li in the artificial SEI layer is used as a binding phase, so that excellent flexibility and mechanical property can be provided, the artificial SEI layer can effectively adapt to violent volume change in a lithium negative electrode circulation process, and the stability of the structure of the artificial SEI layer is kept; and meanwhile, the lithium ion flux is adjusted by pre-designing functional polar groups on the COF, so that smooth deposition of lithium metal is realized.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to a lithium battery electrode and a preparation method and application thereof. Background technique [0002] Lithium metal has a very high theoretical specific capacity (3860mAh / g) and ultra-low electrode potential (-3.04V relative to the standard hydrogen electrode), and is an ideal negative electrode for the next generation of secondary lithium-ion batteries. However, due to the high activity of lithium metal, regional aggregation occurs through additional deposition, and eventually non-planar electrodeposition occurs in the form of moss or dendrite structures, resulting in extremely unstable solid electrolyte interfacial layer (SEI), which is the key factor for lithium anodes in challenges in practical applications. The uncontrolled growth of lithium plating creates at least two serious problems: (1) parasitic side reactions between lithium and electrolyte c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/134H01M4/139H01M4/1395H01M4/62
CPCH01M4/13H01M4/139H01M4/625H01M4/134H01M4/1395
Inventor 宋江选许子轩
Owner XI AN JIAOTONG UNIV
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