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Method for protective treatment of lithium cathodes in lithium secondary batteries

A protective layer and treatment liquid technology, which is applied in the direction of secondary batteries, battery electrodes, non-aqueous electrolyte storage batteries, etc., can solve problems such as discounts and complicated preparation methods, achieve improved cycle performance, simple preparation methods, and suitable for large-scale production Effect

Active Publication Date: 2015-05-13
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, this method does not grow the coating layer in situ on the lithium sheet, which has a certain discount on the effect of inhibiting lithium dendrites, and the preparation method is relatively complicated.

Method used

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  • Method for protective treatment of lithium cathodes in lithium secondary batteries
  • Method for protective treatment of lithium cathodes in lithium secondary batteries
  • Method for protective treatment of lithium cathodes in lithium secondary batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, the preparation of metallic lithium in-situ protective layer

[0027] In a high-purity argon atmosphere, immerse the lithium sheet in tetraethyl orthosilicate and react for 90s at a reaction temperature of 35°C. After taking out the lithium sheet and wiping off the excess orthosilicate liquid on the surface, the SiO provided by the invention can be obtained. 2 The protective layer.

[0028] Observation of SiO with Cold Field Emission Scanning Electron Microscopy (SEM) 2 The morphology of the protective layer, such as figure 1 As shown, the inset is the Mapping picture of the corresponding silicon and oxygen elements. It can be seen from the figure that silicon elements and oxygen elements are evenly distributed on the protective layer. In addition, it can be seen from the cross-sectional view of SEM that SiO 2 The thickness of the protective layer was 150 nm. .

[0029] This kind with SiO 2 The deposition and stripping potential and impedance test r...

Embodiment 2

[0030] Embodiment 2, the preparation of metallic lithium in-situ protective layer

[0031] In a high-purity helium atmosphere, add tetraethyl orthosilicate liquid dropwise on the surface of the lithium sheet, the reaction temperature is 40°C, react for 300s, wipe off the excess tetraethyl orthosilicate liquid on the surface, and the SiO provided by the invention can be obtained. 2 The protective layer.

[0032] Compared with Example 1, the inert atmosphere was changed to helium, the amount of tetraethyl orthosilicate was greatly reduced, and it was dropped on the surface of the lithium sheet instead, and the reaction time was changed to 300s.

[0033] Observation of SiO with Cold Field Emission Scanning Electron Microscopy (SEM) 2 The morphology and structure of the protective layer, the lamellar structure is uniformly grown on the lithium surface, the elements are silicon and oxygen, and the thickness is 100nm.

[0034] This kind with SiO 2 The deposition and stripping pot...

Embodiment 3

[0035] Embodiment 3, the preparation of metallic lithium in-situ protective layer

[0036] Under a high-purity argon atmosphere, immerse the lithium sheet in trimethylchlorosilane and react for 200s at a reaction temperature of 40°C. After taking out the lithium sheet and wiping off the excess trimethylchlorosilane liquid on the surface, the SiO provided by the invention can be obtained. 2 The protective layer.

[0037] Observation of SiO with Cold Field Emission Scanning Electron Microscopy (SEM) 2The morphology of the structure is composed of a multi-layer sheet structure, and the constituent elements are silicon, oxygen and a small amount of chlorine. In addition, it can be seen from the cross-sectional view of SEM that SiO 2 The thickness of the protective layer is about 120nm.

[0038] This kind with SiO 2 The deposition and stripping potential and impedance test results of the lithium sheet of the protective layer are listed in Table 1. The test results when it is u...

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Abstract

The invention discloses a method for in-situ protective treatment of lithium cathodes. The metallic lithium for the in-situ protective treatment of lithium cathodes can be applied to high-performance lithium secondary batteries. The method for in-situ protective treatment of lithium cathodes comprises a method for in-situ generation of silicon dioxide on the surfaces of the lithium cathodes. At a certain temperature, the treating fluid reacts with a passivation layer on the surface of the metallic lithium to obtain a silicon dioxide-containing protective layer. The method for preparing the in-situ protective treatment of lithium cathodes is simple, easy to control and high in practical degree. By applying the metallic lithium for in-situ protection to the lithium secondary batteries, the energy density and cycle performance of the batteries at present can be greatly improved and high practical value is provided.

Description

technical field [0001] The invention relates to a method for protecting and treating lithium negative electrodes in lithium secondary batteries. Background technique [0002] Lithium secondary batteries and lithium-ion batteries play an important role in energy storage devices. Lithium is the metal with the smallest mass and the lowest potential among all simple substances, and its theoretical specific capacity reaches 3860mA h / g. Lithium batteries composed of lithium have the characteristics of high operating voltage, high mass specific capacity and large specific energy. However, lithium batteries using lithium as the anode will generate lithium dendrites and safety issues. In the early 1990s, Sony Corporation of Japan used graphite that can deintercalate lithium as the negative electrode, and successfully prepared a lithium-ion battery with better safety performance. After 30 years of development, lithium-ion batteries have achieved great commercial success. However, t...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M10/0525
CPCH01M4/1395H01M4/382H01M10/0525H01M10/058Y02E60/10
Inventor 郭玉国李念武殷雅侠
Owner INST OF CHEM CHINESE ACAD OF SCI
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