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A composite flexible negative electrode material for lithium battery and a preparation method thereof

A negative electrode material, lithium battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as consumption of active materials, thermal runaway of battery system, battery short circuit, etc., to achieve excellent rate performance, high cycle efficiency, and good cycle life. Effect

Active Publication Date: 2019-01-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problem that currently limits the application of metal lithium anodes is the dendrite growth during charging.
On the one hand, the growth of dendrites will lead to a short circuit of the battery, which will cause a series of safety accidents such as thermal runaway of the battery system and ignition of the electrolyte; Decrease in battery utilization

Method used

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  • A composite flexible negative electrode material for lithium battery and a preparation method thereof
  • A composite flexible negative electrode material for lithium battery and a preparation method thereof
  • A composite flexible negative electrode material for lithium battery and a preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The thickness is 330μm, the area weight density is 12mg cm -2 , the surface resistivity is less than 3mΩcm 2 The carbon cloth is cut into electrode sheets, and then the two poles of the battery are formed with metal lithium, and the battery is assembled in a glove box. The electrolyte is a DOL / DME (v / v=1:1) solution of 1M LiTFSI, and 1w% of LiNO 3 . At 35% overintercalation, at 1mA cm -2 99.9% Coulombic efficiency can still be maintained when cycling 160 cycles at the highest current density, the results are as follows figure 1 shown.

Embodiment 2

[0032] The thickness is 330μm, the area weight density is 12mg cm -2 , the surface resistivity is less than 3mΩcm 2 The carbon cloth is cut into electrode sheets, and then the two poles of the battery are formed with metal lithium, and the battery is assembled in a glove box. The electrolyte is a DOL / DME (v / v=1:1) solution of 1M LiTFSI, and 1w% of LiNO 3 . At 35% overintercalation, at 3mA cm -2 99.7% Coulombic efficiency can still be maintained when cycling 50 cycles at the same current density, the results are as follows figure 2 shown.

Embodiment 3

[0034] The thickness is 330μm, the area weight density is 12mg cm -2 , the surface resistivity is less than 3mΩcm 2 The carbon cloth is cut into electrode sheets, and then the two poles of the battery are formed with metal lithium, and the battery is assembled in a glove box. The electrolyte is a DOL / DME (v / v=1:1) solution of 1M LiTFSI, and 1w% of LiNO 3 . At 35% overintercalation, at 5mA cm -2 99.6% Coulombic efficiency can still be maintained when cycling for 30 cycles at the highest current density. The results are as follows: image 3 shown.

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Abstract

The invention relates to a composite flexible negative electrode material for lithium battery and preparation thereof. the negative electrode material comprises flexible carbon fibers and metal lithium clusters grown on the surface of the flexible carbon fibers in a cluster shape, wherein the metal lithium clusters account for 0-50% of the capacity of the flexible carbon fibers and are not zero. The preparation method comprises the following steps: placing a flexible carbon fiber in an electrolyte, intercalating lithium in the electrolyte by a constant-current lithium intercalation mode, and growing metal lithium clusters on the surface of the flexible carbon fiber to obtain a composite flexible negative electrode material for a lithium battery. Compared with the prior art, the present invention has the advantages of large specific capacity, high first efficiency cycle efficiency, excellent rate performance, good safety and cycle life, and meets the requirements of novel high power density lithium ion batteries.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a composite flexible negative electrode material for lithium batteries and a preparation method thereof. Background technique [0002] Lithium-ion battery is a secondary battery that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. The mechanism of lithium-ion battery energy storage is very direct. It uses electric energy to intercalate (deintercalate) lithium ions on the battery electrode, thereby causing a reduction (oxidation) reaction, which converts electrical energy and chemical energy. Graphite is used as the negative electrode of lithium batteries. Material, LiCoO 2 as anode material. [0003] During charging, the Li + ions in LiCoO 2 The positive electrode is deintercalated, and through the conduction of the electrolyte, it finally moves to the graphite negative electrode and is embedded in the graphite lay...

Claims

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Application Information

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IPC IPC(8): H01M4/62
CPCH01M4/625Y02E60/10
Inventor 段华南田然
Owner SHANGHAI JIAO TONG UNIV
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