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Lithium metal negative pole preparation method, lithium metal negative pole and lithium battery

A technology for metal lithium and lithium batteries, which is applied in the preparation and application of stable metal lithium negative electrodes, can solve problems such as uneven deposition of lithium and uneven distribution of surface potential, and achieves the advantages of simple and easy method, excellent cycle performance and strong practicability Effect

Inactive Publication Date: 2018-05-15
SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Lithium metal has a very attractive application prospect in high-efficiency energy storage, but due to the uneven surface potential distribution of lithium in the process of charging and discharging, uneven deposition of lithium

Method used

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  • Lithium metal negative pole preparation method, lithium metal negative pole and lithium battery
  • Lithium metal negative pole preparation method, lithium metal negative pole and lithium battery
  • Lithium metal negative pole preparation method, lithium metal negative pole and lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Preparation of a stable metal lithium negative electrode:

[0030] Accurately weigh 0.1g of polyvinylidene fluoride (PVDF) and fully dissolve in 3.4g of solvent N-methylpyrrolidone (NMP). After mixing evenly, add 0.1g of conductive carbon black and mix evenly. Add 0.8g of carbon fluoride and mix evenly. Stir Evenly coated on the copper foil current collector after overnight, punched and cut into 18mm pole piece; after drying, put the metal lithium piece and the carbon fluoride pole piece in sequence in the CR2016 button battery case, and add an appropriate amount of electrolyte LiPF 6 (EC:DMC 3:7), disassembled after standing for 24h, and obtained lithium metal sheet after processing, such as figure 1 After the treatment shown, there is a layer of gray substance on the surface of the metal lithium sheet, which may be the protective layer of lithium fluoride after the reaction. The metal lithium sheet after the treatment can be used as a stable metal lithium negativ...

Embodiment 2

[0037] The reaction time for preparing the stable metal lithium negative electrode is different, which is to stand still for 12 hours, and the rest are the same as in Example 1.

Embodiment 3

[0039] (1) Preparation of a stable metal lithium negative electrode:

[0040] Accurately weigh 0.1g PVDF and fully dissolve in 3.4g NMP, mix evenly, add 0.1g conductive carbon black, mix evenly, add 0.8g carbon fluoride, mix evenly, stir overnight and spread evenly on the copper foil current collector, die-cut into a 18mm pole piece; after drying, put the lithium metal sheet and the carbon fluoride pole piece in the CR2016 button battery case in sequence, and add an appropriate amount of electrolyte bistrifluoromethanesulfonamide lithium LiTFSI (ethylene glycol di Dimethyl ether (DME) / 1,3-dioxolane (DOL)), after standing for 24 hours, take it apart for use.

[0041] (2) Assemble metal lithium-sulfur battery (Li-S):

[0042] In the CR2016 button battery shell, put the processed metal lithium sheet, diaphragm and sulfur carbon pole piece in sequence, add an appropriate amount of electrolyte LiTFSI (DME / DOL), and compact it to obtain a stable metal lithium-sulfur battery.

[00...

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Abstract

The invention discloses a lithium metal negative pole preparation method, a lithium metal negative pole and a lithium battery. The preparation method comprises the steps: step 1, utilizing carbon fluoride as a positive pole active material to prepare positive pole plate slurry, coating a current collector with the positive pole plate slurry and punching to prepare carbon fluoride pole pieces; step2, utilizing a lithium metal sheet, a carbon fluoride pole piece and a lithium ion conductive solution to assemble a button battery, wherein the lithium metal sheet and the carbon fluoride pole piecedirectly contact each other; step 3, standing for a period, disassembling the button battery and taking the lithium metal sheet out, wherein a lithium metal protecting layer is formed on the surfaceof the lithium metal sheet. According to the preparation method disclosed by the invention, lithium fluoride is introduced to the surface of the lithium metal in an in-situ reaction mode, so that stable lithium metal can be prepared; the preparation method has the advantages of no addition of any extra technology, simpleness, easiness and practicability in method, strong industrial feasibility andindustrial application value and potential. The lithium metal negative pole prepared by the preparation method disclosed by the invention has excellent circulation performance in all kinds of lithiumbatteries and has a good application prospect and universality in lithium secondary batteries.

Description

technical field [0001] The invention belongs to the field of chemical power sources and also belongs to the technical field of energy materials. Specifically relates to the preparation and application of a stable metal lithium negative electrode. Background technique [0002] With the continuous innovation and development of electronic communication technology, secondary batteries have been paid more and more attention by people. With the advantages of high specific capacity and good cycle stability, lithium-ion batteries are considered to be the most promising secondary batteries. With the continuous improvement of people's requirements for energy density, it is difficult for lithium-ion batteries to meet the increasing demand for specific energy. The development of high-capacity negative electrodes is an important prerequisite for the development of 400Wh / kg lithium batteries, so metals with high specific capacity natural advantages Lithium anodes have drawn attention. ...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M4/134H01M10/052
CPCH01M4/134H01M4/1395H01M10/052Y02E60/10
Inventor 王勇方聪聪罗伟林解晶莹杨炜婧郭瑞张熠霄刘雯俞超
Owner SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH
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