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Lithium metal negative electrode dual protection method and application

A lithium metal negative electrode and double protection technology, applied in the field of material science, can solve problems such as difficult to meet the requirements of power batteries, loss of electronic conductivity, and restricted cycle performance, to achieve excellent ion conductivity, improve electrochemical performance and safety performance, Effect of reducing lithium deposition

Active Publication Date: 2019-04-05
安徽盟维新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its shortcomings are also very obvious. In the process of charging and discharging, uneven lithium deposition leads to the generation of lithium dendrites. The growth of lithium dendrites may pierce the separator and cause the battery to short circuit or even explode; at the same time, during the discharge process, the dendrite root The preferential dissolution of lithium leads to the fracture of dendrite lithium, which loses its electronic conductivity and forms "dead lithium", which seriously restricts its cycle performance.
Therefore, the secondary battery based on the lithium metal negative electrode has not achieved real commercial application. The commonly used negative electrode materials are still mainly graphite materials, but its theoretical specific capacity is only one tenth of that of the lithium metal negative electrode, which is difficult to meet Power Battery Requirements

Method used

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Examples

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Embodiment 1

[0103] In the glove box, a commercially purchased lithium strip (thickness 200 μm) was cut with long-blade scissors to obtain a rectangular lithium metal negative electrode sheet with a size of 6 × 8.5 cm. The surface of the negative electrode is scratched horizontally once, and the surface of the lithium metal negative electrode presents a silver-white metallic luster. Then, the ZnCl was heated using a magnetic stirrer 2 Solid and LiNO 3 Dry the solid at 75°C for 8-12 hours to remove trace moisture that may be contained, and dry 0.10g of ZnCl 2 solid with 0.10 g of dried LiNO 3 The solids were dissolved together in 40 mL of THF solvent, and then magnetically stirred at 100 rpm for 40 min to form a clear and transparent solution. Pour the prepared solution into a watch glass, flatten and completely soak the polished lithium sheet in the solution, and react at 35°C for 100 seconds. After the reaction is completed, immediately take out the lithium sheet and rinse the lithium ...

Embodiment 2

[0105] This embodiment is basically the same as Embodiment 1 above. In this example LiNO 3 The mass of the solid is 0.05g, ZnCl 2 / LiNO 3 The reaction time of the mixed solution at 40° C. was 60 s. The other specific preparation process was the same as that of Example 1, and the cycle performance of the assembled secondary battery was basically similar to that of Example 1.

Embodiment 3

[0107] This embodiment is basically the same as Embodiment 1 above. In this example ZnCl 2 The mass of the solid is 0.40g, ZnCl 2 / LiNO 3 The reaction time of the mixed solution at 45° C. was 10 s. The other specific preparation process was the same as that of Example 1, and the cycle performance of the assembled secondary battery was basically similar to that of Example 1.

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Abstract

The invention discloses a lithium metal negative electrode dual protection method and application. The method comprises the steps of: infiltrating a lithium metal negative electrode in a mixture of ametal halide and an additive, and forming a composite protective layer in situ on the surface of the lithium metal negative electrode, wherein the composite protective layer comprises combination of an alloy and an inorganic salt; and coating the surface of a membrane with an organic polymer solution to obtain a membrane having an inner surface coated with an elastic organic modifying layer. The lithium metal negative electrode dual protection method and application are simple to operate, high in controllability, low in raw material cost, easy to obtain the raw materials and low in cost, and can form a layer of stable composite protective layer at the surface of the lithium metal negative electrode. The protective layer can effectively inhibit the growth of the lithium dendrites and can reduce the side reaction generated by contact of the lithium metal negative electrode and the electrolyte, and the obtained modified lithium metal negative electrode is stable in cycle performance to effectively inhibit the generation of the dendrites of the lithium metal negative electrode and can be widely applied to the novel high specific energy electrochemical energy storage device, such as a lithium ion battery and a lithium-sulfur battery.

Description

technical field [0001] The invention relates to a modification method of a lithium metal negative electrode, in particular to a method for double protection of the negative electrode of a lithium metal negative electrode secondary battery and its application, and belongs to the field of material science and technology. Background technique [0002] Among many energy storage systems, lithium-ion secondary batteries have been widely used in 3C digital, electric transportation and other fields due to their advantages such as high working voltage, high specific capacity, and long cycle life. In recent years, with the rapid development of new energy vehicles, the requirements for energy density are getting higher and higher. However, the energy density of lithium-ion secondary batteries is limited by the electrode material system and has not been significantly improved, making it difficult to meet the needs of various products. Therefore, the development of new electrode material...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M4/04H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/411H01M50/417H01M50/426H01M50/449
CPCH01M4/049H01M10/0525H01M10/4235H01M50/403H01M50/409Y02E60/10
Inventor 张跃钢周飞戎泽汪利萍何俊孙亢张辉周莉莎
Owner 安徽盟维新能源科技有限公司
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