Metal lithium negative electrode of lithium battery

A technology for metal lithium and lithium batteries, applied in the field of metal lithium anodes, can solve problems such as multiple side reactions of three-dimensional nano-skeletons, and achieve the effects of simple and feasible methods, improved cycle life, and reduced side reactions

Inactive Publication Date: 2017-08-18
TSINGHUA UNIV
View PDF4 Cites 59 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods provide many new ideas for suppressing dendrites, but they are limited by many conditions in the application process, such as a certain additive can only be used in a specific solvent, and the three-dimensional nano-skeleton will bring more side reactions, etc. Wait

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: Lithium sheet is placed in electrolyzer, the electrolytic solution that adopts is two (trifluoromethylsulfonyl) lithium (2mol L -1 )-lithium nitrate (0.001mol L -1 )-1,3-dioxolane / dimethoxyethane, plating once, current density 1μA cm -2 , the time is 1000h, and the thickness of the protective film obtained on the surface of the lithium sheet is 200um. The lithium sheet is taken out and assembled with the sulfur positive electrode to form a lithium-sulfur battery. After testing, it is found that the coulombic efficiency of the lithium-sulfur battery can reach 99%, and the cycle life can reach Reach 5000 laps.

Embodiment 2

[0017] Embodiment 2: Lithium sheet is placed in the electrolyzer, and the electrolytic solution that adopts is lithium dioxalate borate (0.1mol L -1 )-fluoroethylene carbonate (0.01mol L -1 )-ethylene carbonate / diethyl carbonate, electroplated 50 times at a current density of 4mA cm -2 , the time is 10h, and the thickness of the protective film obtained on the surface of the lithium sheet is 100um. The lithium sheet is taken out and assembled into a lithium-air battery. After testing, it is found that the coulombic efficiency of the lithium-air battery can reach 92%, and the cycle life can reach 500 cycles.

Embodiment 3

[0018] Embodiment 3: Lithium sheet is placed in electrolyzer, the electrolytic solution that adopts is bisfluoroxanthimide lithium (5mol L -1 )-vinylene carbonate (0.1mol L -1 )-dimethylsulfoxide, electroplating 100 times at a current density of 100mA cm -2 , the time is 1s, and the thickness of the protective film obtained on the surface of the lithium sheet is 50um. The lithium sheet is taken out and assembled with the ternary material to form a battery. After testing, it is found that the Coulombic efficiency of the battery can reach 80%, and the cycle life can reach 100. lock up.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention discloses a metal lithium negative electrode of a lithium battery. A solid-state electrolyte protection layer is on the surface of the metal lithium negative electrode. By performing electrochemical pretreatment on the lithium negative electrode, an efficient and stable solid-state electrolyte interface membrane is introduced to the surface of a lithium sheet; in the repeated deposition and separation processes of lithium ions, the solid-state electrolyte protection layer can suppress appearance of dendritic crystals and improve safety performance of the battery; in addition, the electrolyte and metal lithium also can be isolated to protect the lithium metal from being corroded by the electrolyte; by virtue of an electroplating process and screening of electrolyte types, effective protection of the metal lithium negative electrode is realized, and the cycle life of the lithium metal battery is prolonged; and compared with an unprocessed lithium negative electrode, the metal lithium negative electrode protected by the solid-state electrolyte layer can effectively suppress appearance of dendritic crystal-shaped lithium sediments, reduce secondary reactions of the electrolyte and the metal lithium, and improve cycling efficiency and cycling stability, thereby prolonging the cycle life of the lithium metal battery which takes the metal lithium as the negative electrode.

Description

technical field [0001] The invention relates to a metal lithium negative electrode, belonging to the technical field of metal lithium batteries using metal lithium as the negative electrode. Background technique [0002] Energy is closely related to people's lives, and the emergence of batteries makes the use of energy more convenient and faster. In the 1990s, Sony Corporation developed a graphite anode that can be safely used, which brought about the large-scale application of lithium-ion batteries in personal electronic devices and other fields. However, with the increasing demand for high-end electronic equipment and electric vehicles, lithium-ion batteries based on traditional oxide positive electrodes and graphite negative electrodes are gradually difficult to meet the demand, and the development of energy storage systems with higher energy density is imminent. Among the known electrode materials, the lithium metal negative electrode is 3860mAh·g -1 The high capacity ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13
CPCH01M4/13Y02E60/10
Inventor 张强程新兵闫崇
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap