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Preparation method and application of low-volume-change metal secondary battery negative electrode

A solid electrolyte and metal-organic framework technology, applied in the field of electrochemical energy storage, can solve the problems of SEI film stability, dendrite growth, electrode volume change, etc.

Active Publication Date: 2019-07-05
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its conductive properties and the SEI film on the surface cannot remain stable during the long cycle, lithium dendrites will inevitably form and grow on the surface.
The present invention solves the problem of dendrite growth and electrode volume change in metal secondary batteries, and proposes to construct a composite metal negative electrode integrating three-dimensional current collector and artificial SEI film

Method used

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  • Preparation method and application of low-volume-change metal secondary battery negative electrode
  • Preparation method and application of low-volume-change metal secondary battery negative electrode
  • Preparation method and application of low-volume-change metal secondary battery negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Preparation of spun membrane composite three-dimensional porous current collector: First, under the protection of argon atmosphere, commercialized cotton is placed in a carbonization furnace, and the three-dimensional carbon fiber obtained by carbonization at a high temperature of 1200°C for 4 hours. Secondly, the MOF-808 powder and PVDF are uniformly mixed in a ratio of 3:1 to prepare a slurry for use. Next, spread the three-dimensional carbon fiber obtained by carbonization of cotton on a clean copper foil, inject the prepared slurry into a 10mL syringe, set the operating voltage to 10kV, the receiving distance between the needle tip and the three-dimensional carbon fiber is 10cm, and the injection flow rate It is 0.5 mL / h; the membrane is formed by electrospinning technology, and then vacuum dried at 80° C. for 10 hours, and the spinning membrane composite three-dimensional porous current collector is formed after drying, which is taken out for battery testing. Th...

Embodiment 2

[0056] Other conditions are the same as in Example 1, except that (1) Lithium deposited by electrochemical method 15mAh cm -2 . Image 6 It is shown that metallic lithium is uniformly deposited in the three-dimensional porous carbon fiber without dendritic lithium dendrites on the surface. The thickness of the three-dimensional composite electrode after the deposition of metallic lithium is about 124μm, which is close to the electrode thickness before deposition, and the electrode volume change rate is only -1.6 %. The lithium negative electrode is at 1mA cm -2 It can circulate for 700 hours under current density. The reversible capacity of the assembled MOF-HCF@Li|LFP battery can reach 161mA h g -1 Circulate 200 times, the capacity retention rate is 91.8%, and the volume expansion rate is 2.1%.

Embodiment 3

[0058] The other conditions are the same as in Example 1, except for the high-temperature carbonization at 1000°C. The thickness of the spinning membrane is 15μm, and the pore volume per unit area is 0.002cm 3 / cm 2 , A spinning membrane with a pore size of 100-500 nm, and the total thickness of the spinning membrane composite three-dimensional porous current collector is about 111 μm. Lithium deposited by electrochemical method 6mA h cm -2 , The metal lithium is uniformly deposited in the three-dimensional porous carbon fiber, and there is no dendritic lithium dendrites on the surface. The thickness of the three-dimensional composite electrode after the deposition of metal lithium is about 115μm, which is close to the electrode thickness before the deposition, and the electrode volume change rate is only -3.6% . The lithium negative electrode is at 1mA cm -2 It can circulate for 800 hours under current density. The reversible capacity of the assembled MOF-HCF@Li|LFP battery c...

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Abstract

The invention provides a spinning membrane composite three-dimensional porous current collector as well as a preparation method and application thereof; the spinning membrane composite three-dimensional porous current collector comprises a three-dimensional porous current collector material and a spinning membrane which covers the surface of the three-dimensional porous current collector materialand is formed by an electrostatic spinning technology, wherein the spinning membrane is a solid electrolyte interface membrane. The current collector can be used for realizing high-surface-capacity metal deposition, inhibiting dendritic crystal growth and relieving the electrode volume change, so that the safety and the cycle life of the metal negative electrode are improved and prolonged.

Description

Technical field [0001] The invention belongs to the field of electrochemical energy storage, and specifically relates to a hybrid three-dimensional porous current collector, a preparation method thereof, a high-safety metal negative electrode using the hybrid three-dimensional porous current collector, and a safe and long-life metal using the negative electrode Secondary batteries and their applications in high energy density energy storage devices. Background technique [0002] With the increasingly prominent environmental pollution caused by the burning of traditional fossil fuels, people urgently need to develop a cleaner energy system. Due to the advantages of high energy density and excellent cycle stability, lithium-ion batteries have been widely used in small consumer energy fields such as mobile phones, notebook computers and robots. Among the currently commercialized lithium-ion batteries, lithium-ion batteries assembled with graphite as the negative electrode and terna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/80H01M10/05H01M10/052H01M10/42
CPCH01M4/661H01M4/663H01M4/667H01M4/80H01M10/05H01M10/052H01M10/4235Y02E60/10
Inventor 郭玉国叶欢郑自建
Owner INST OF CHEM CHINESE ACAD OF SCI
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