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A three-dimensional mixed ion-electronic conductor current collector and its preparation method and application

An electronic conductor, three-dimensional hybrid technology, applied in three-dimensional mixed ion electronic conductor current collector and its preparation, the application field of three-dimensional mixed ion electronic conductor current collector in lithium-lithium iron phosphate battery, can solve the problem of poor cycle performance of lithium metal battery. It can make up for the uneven distribution of the electrolyte, improve the energy density, and achieve the effect of uniform deposition.

Active Publication Date: 2021-03-02
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the technical problem of poor cycle performance of lithium metal batteries in the prior art, and provides a three-dimensional mixed ion-electronic conductor current collector and its preparation method and application, creatively adopting a three-dimensional mixed ion-electronic conductor current collector, Improve the wetting degree of the electrolyte on the electrode material at the micron scale, make up for the uneven distribution of the electrolyte during the cycle, and make the deposition of lithium metal more uniform; at the same time, by adding additional ion transmission paths, the dissolution of lithium metal occurs In the bulk phase; the three-dimensional mixed ion-electronic conductor current collector of the present invention enables the lithium metal negative electrode to operate at a high capacity (20mAhcm -2 ), high current density (5mA cm -2 ) can be stable for a long time

Method used

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  • A three-dimensional mixed ion-electronic conductor current collector and its preparation method and application
  • A three-dimensional mixed ion-electronic conductor current collector and its preparation method and application
  • A three-dimensional mixed ion-electronic conductor current collector and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Add polyvinyl alcohol with a concentration of 0.05kg / L and LiAc·2H with a concentration of 1.05mol / L 2 O, 0.45mol / L LaAc 3 ·xH 2 O, 0.30mol / L concentration of ZrAc 4 and 0.30mol / L anhydrous citric acid were dissolved in 20mL deionized water, and stirred to obtain a homogeneous solution;

[0031] (2) Using the above solution to carry out electrospinning to obtain an insulating electrospun film, wherein the spinning voltage is 20kV, the injection speed of the syringe needle is 0.40ml / h, and the distance between the syringe needle and the aluminum foil receiver is 20cm, and the spinning The time is 2h;

[0032] (3) Put the electrospun film above in a muffle furnace, and perform pre-oxidation in an air atmosphere, wherein the temperature is 180°C, the time is 5h, and the heating rate is 1°C / min;

[0033] (4) Put the above-mentioned pre-oxidized film in a tube furnace, and perform high-temperature calcination under a protective gas atmosphere, wherein the temperature...

Embodiment 2

[0039] Prepare and test with the method of Example 1, the difference is only that the concentration of polyvinyl alcohol in step (1) is 0.10kg / L, LiAc·2H 2 O concentration is 0.70mol / L, LaAc 3 ·xH 2 O concentration is 0.30mol / L, ZrAc 4 The concentration of citric acid is 0.20mol / L, and the concentration of anhydrous citric acid is 0.20mol / L; the ionic conductor particle Li in the obtained mixed ion electronic conductor current collector 7 La 3 Zr 2 o 12 (LLZO) and electronic conductor fiber network mass ratio is 2:1.

Embodiment 3

[0041] Prepare and test with the method of Example 1, the difference is only that the concentration of polyvinyl alcohol in step (1) is 0.2kg / L, LiAc·2H 2 O concentration is 0.35mol / L, LaAc 3 ·xH 2 O concentration is 0.15mol / L, ZrAc 4 The concentration of citric acid is 0.10mol / L, and the concentration of anhydrous citric acid is 0.1mol / L; the ionic conductor particle Li in the obtained mixed ion electronic conductor current collector 7 La 3 Zr 2 o 12 (LLZO) and the mass ratio of the electronic conductor fiber network is 1:1.

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Abstract

The invention belongs to the field of battery technology, and discloses a three-dimensional mixed ion electronic conductor current collector and its preparation method and application. The current collector has a three-dimensional fiber network structure, including an electronic conductor fiber network and ions uniformly loaded on the electronic conductor fiber network. Conductor particles; the electronic conductor fiber network uses carbon fibers, and the ion conductor particles use LLZO, LLTO or LATP nano-ceramic particles; it is obtained through three steps of precursor solution preparation, electrospinning, and high-temperature calcination; the prepared three-dimensional mixed ion electronic conductor set fluid at up to 5mA cm ‑2 Current density or up to 20mAh cm ‑2 The deposited capacity can be stably cycled in lithium metal batteries and can be used in lithium-iron phosphate batteries with a rate of up to 20C.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a three-dimensional mixed ion-electronic conductor current collector for lithium metal negative electrodes and a preparation method thereof, and the use of the three-dimensional mixed ion-electronic conductor current collector in a lithium-iron phosphate lithium battery Applications. [0002] technical background [0003] Currently, there is an increasing demand for energy density in portable electronic devices, electric vehicles, and the like. The lithium metal anode has a high theoretical capacity (3860mAh g -1 ) and low reduction potential (-3.04V vs. standard hydrogen electrode), which have been extensively studied in recent years. However, problems such as dendrite growth and volume change of the lithium metal anode during the cycle will cause irreversible capacity loss of the battery and changes in the internal pressure of the material, and more seriously wil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/70
CPCH01M4/665H01M4/70Y02E60/10
Inventor 罗加严张婵媛刘山
Owner TIANJIN UNIV
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