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A method for grow a protective layer on that surface of a metal negative electrode of a secondary lithium battery

A technology for secondary lithium batteries and metal negative electrodes, applied in the field of lithium ion batteries, can solve the problems of difficult operability, complicated preparation methods, poor cycle performance of lithium dendrite growth batteries, etc., to solve lithium dendrites, improve cycle performance, Practical effect

Active Publication Date: 2018-12-21
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although many methods for protecting the lithium negative electrode and forming a protective layer on the surface of the lithium negative electrode have been proposed in the existing invention patents, the operability is relatively difficult, the preparation method is relatively complicated, and it cannot fundamentally solve the problem of lithium dendrite growth and poor battery cycle performance. The problem

Method used

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  • A method for grow a protective layer on that surface of a metal negative electrode of a secondary lithium battery
  • A method for grow a protective layer on that surface of a metal negative electrode of a secondary lithium battery
  • A method for grow a protective layer on that surface of a metal negative electrode of a secondary lithium battery

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Effect test

Embodiment 1

[0019] This example is used to illustrate the preparation and application of the metal lithium negative electrode surface protection layer of the present invention.

[0020] In the glove box, respectively dissolve 2-methylimidazole and cobalt nitrate in dimethyl carbonate (DMC), then quickly pour the cobalt nitrate solution into the methylimidazole solution, and after 30 seconds, commercial lithium metal Put it into the above mixed solution, let it stand for an hour, take it out, rinse it with DMC, and let it dry naturally.

[0021] The scanning electron microscope (SU-3500, Hitachi, Japan) photo of the surface of metal lithium electrode is as follows figure 1 As shown, the visible surface is basically flat. The surface of the treated lithium sheet is as follows figure 2 As shown, it can be seen that there is obviously a covering layer on the surface of this bright lithium sheet. The lithium sheet before and after treatment was used as the negative electrode of the simulat...

Embodiment 2

[0027] This example is used to illustrate the preparation and application of the metal lithium negative electrode surface protection layer of the present invention.

[0028] In the glove box, dissolve N-ethylimidazole and ferric sulfate in dimethyl carbonate (DMC), and quickly pour the cobalt nitrate solution into the methylimidazole solution. After 30 seconds, put the lithium-boron alloy into the In the above mixed solution, after standing still for one hour, take it out, rinse it with DMC, dry it naturally, and record it as A2.

[0029] Then, the positive electrode of the simulated battery was prepared according to the method of Example 1. After 300 cycles, the specific capacity of the positive electrode of the simulated battery phase remained at 130 mAh / g, see Table 1.

Embodiment 3

[0031] This example is used to illustrate the preparation and application of the metal lithium negative electrode surface protection layer of the present invention.

[0032] In the glove box, 1-vinylimidazole and ferrous sulfate were dissolved in dimethyl carbonate (DMC), and then the cobalt nitrate solution was quickly poured into the methylimidazole solution. After 30 seconds, the lithium aluminum alloy was placed Put it into the above mixed solution, stand still for one hour, take it out, rinse it with DMC, dry it naturally, and record it as A3.

[0033] Then, the positive electrode of the simulated battery was prepared according to the method of Example 1. After 300 cycles, the specific capacity of the positive electrode of the simulated battery phase remained at 128 mAh / g, see Table 1.

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Abstract

The invention discloses a method for growing a protective layer on the surface of a metal negative electrode of a secondary lithium battery, Dimethyl carbonate is chosen as base liquid, salt compoundof transition metal is chosen as treating agent, imidazole reagent is chosen as solvent, base liquid is mixed, and the treating agent which accounts for 0.1-15% of base liquid and the solvent which accounts for 10-65% of base liquid are mixed to prepare protective liquid. B, that metal negative electrode is place in the protective liquid for standing, vibration, shake or agitation treatment, and the treatment temperature is -20 to 120 DEG C and the time is 5 to 5 hour. A layer of protective layer can be formed on that surface of a lithium metal or a lithium alloy negative electrode effectively, the growth of lithium dendrite on the surface can be inhibited, and the safety performance and the cycle performance of the battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for growing a protective layer on the surface of a metal negative electrode of a secondary lithium battery. Background technique [0002] At present, with the rapid development of consumer electronic products, people's demand for high energy density secondary power supply is becoming more and more urgent. Due to the use of graphite negative electrodes, traditional lithium-ion batteries are limited by their theoretical specific capacity, and it is difficult to meet people's needs in terms of energy density. [0003] Lithium metal is the next-generation high-energy anode material that has received widespread attention. Its theoretical specific capacity is as high as 3860mAh / g, and it has a high exchange current density and low polarization, so it has great development prospects. However, due to the instability of metal lithium during the cycle, l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1395H01M4/36H01M4/38H01M4/40H01M4/62H01M10/0525
CPCH01M4/0402H01M4/1395H01M4/366H01M4/382H01M4/405H01M4/628H01M10/0525Y02E60/10
Inventor 朱刚刘强周思思隋鑫吴军
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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