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Multi-layer structured composite electrolyte and secondary battery using same

A composite electrolyte and multilayer composite technology, which is applied in the field of composite electrolyte with multilayer structure and the secondary battery using it, can solve the problem that it is difficult to find polymers or ceramics at the same time, and achieve the effect of excellent thermal stability and excellent capacity

Pending Publication Date: 2019-11-22
SEVEN KING ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, since the positive and negative parts of the secondary battery have different electrochemical reactions and require different electrochemical characteristics, it is difficult to find the optimal polymer or ceramic for both the positive and negative parts.

Method used

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  • Multi-layer structured composite electrolyte and secondary battery using same
  • Multi-layer structured composite electrolyte and secondary battery using same
  • Multi-layer structured composite electrolyte and secondary battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] In the first composite electrolyte layer, LTAP was used as the ceramic material, PVdF was used as the polymer, and 1M LiPF in EC / DMC (ethyl carbonate / dimethyl carbonate, 1:1vol) 6 As a liquid electrolyte, in the second composite electrolyte layer, LLZO is used as a ceramic material, PVdF is used as a polymer, and 1M LiPF in EC / DMC (ethyl carbonate / dimethyl carbonate, 1:1vol) 6 as a liquid electrolyte. A multilayer composite electrolyte was prepared by laminating the first composite electrolyte layer (upper layer) and the second composite electrolyte layer (lower layer). figure 2 A schematic diagram of this multilayer composite electrolyte is shown.

[0059] image 3 A surface SEM image of the first composite electrolyte layer is shown. Figure 4 A surface SEM image of the second composite electrolyte layer is shown. Figure 5 A cross-sectional view showing a multilayer composite electrolyte, Figure 6 The elemental analysis diagram of the section is shown.

[006...

Embodiment 2

[0062] Take LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 (nickel-cobalt-manganese oxide lithium (NMC), lithium nickel-manganese-cobalt oxide) positive electrode material is used as positive electrode, with lithium metal as negative electrode, with the multilayer composite electrolyte of embodiment 1 as electrolyte, has prepared the secondary battery of embodiment 2 .

[0063] Use LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 (NMC, lithium nickel manganese cobalt oxide) positive electrode material as the positive electrode, lithium metal as the negative electrode, and the first composite electrolyte layer single layer of Example 1 as the electrolyte, the secondary battery of Comparative Example 1 was prepared.

[0064] For the above two secondary batteries, charge and discharge tests were carried out under the conditions of a charge voltage of 4.4V, a discharge voltage of 3.0V, and a battery capacity of 0.1C. Figure 7 The discharge capacity showing the number of cycles of the secondary battery of Example ...

Embodiment 3

[0068] Example 3 compares the ionic conductivity and interfacial resistance according to the electrolyte. The multilayer composite electrolyte prepared in Example 1 (Example 3), the multilayer composite electrolyte prepared in Example 1 does not contain liquid electrolyte (comparative example 2), the liquid electrolyte used in Example 1 ( Comparative Example 3) for comparison.

[0069] Figure 12 The ionic conductivities at room temperature of the electrolytes of Example 3, Comparative Example 2, and Comparative Example 3 are shown. Figure 13 The interface resistances of the electrolytes of Example 3, Comparative Example 2, and Comparative Example 3 are shown. Such as Figure 12 As shown, the ionic conductivity of the liquid electrolyte of Comparative Example 3 at room temperature is 2.1×10 -3 S / cm. The multilayer composite electrolyte of embodiment 3 has an ion conductivity of 7.9×10 at room temperature -4 S / cm. The electrolyte of Comparative Example 2 (a multilayer c...

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Abstract

The present invention relates to a multi-layer structured composite electrolyte for a secondary battery and a secondary battery using the same. The multi-layer structured composite electrolyte of thepresent invention is prepared by laminating two or more layers of composite electrolyte containing a small amount of liquid electrolyte in addition to a mixture of a polymer and a ceramic material. The multi-layer structured composite electrolyte of the present invention has equal or superior electrochemical characteristics compared with a liquid electrolyte while having equal stability to the solid electrolyte. The multi-layer structured composite electrolyte of the present invention can also be used in wearable apparatuses since the multi-layer structured composite electrolyte can be arbitrarily folded.

Description

technical field [0001] The present invention relates to a multilayer structure composite electrolyte for a secondary battery and a secondary battery using the same. The multilayer structure composite electrolyte of the present invention is produced by laminating two or more layers of a composite electrolyte containing a small amount of liquid electrolyte in a mixture of a polymer and a ceramic material. The multilayer structure composite electrolyte of the present invention has the same stability as the solid electrolyte, and has the same or better electrochemical characteristics as the liquid electrolyte. And the multilayer structure composite electrolyte of the present invention can be folded arbitrarily, so it can also be used in wearable devices. Background technique [0002] The application fields of secondary batteries are expanding day by day, not only for charging and discharging portable devices such as mobile phones, notebook computers, and video cameras, but also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/052H01M10/054
CPCH01M10/052H01M10/054H01M10/056H01M2300/0025H01M2300/0068H01M2300/0082Y02E60/10H01M50/446H01M50/46H01M2300/0045H01M10/0525H01M10/0562H01M10/0565
Inventor 金宰光
Owner SEVEN KING ENERGY
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