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Electrolyte for lithium secondary battery and lithium-oxygen secondary battery

A lithium secondary battery, secondary battery technology, applied in secondary batteries, fuel cell type half cells, secondary battery type half cells, battery electrodes, etc., can solve the complex reaction process conditions and consume large energy raw materials and other problems, to achieve the effects of corrosion mitigation, voltage stabilization, corrosion mitigation and even exhaustion

Active Publication Date: 2017-09-29
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some progress has been made, the reaction process conditions are relatively complicated, requiring a large amount of energy and expensive raw materials

Method used

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  • Electrolyte for lithium secondary battery and lithium-oxygen secondary battery
  • Electrolyte for lithium secondary battery and lithium-oxygen secondary battery
  • Electrolyte for lithium secondary battery and lithium-oxygen secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] This embodiment provides a lithium-oxygen secondary battery based on a highly reversible lithium negative electrode (high cycle life lithium negative electrode), and its structure can be referred to figure 1 As shown, the cathode gas (ie working gas) used in this embodiment is oxygen, and the battery number of this embodiment is marked as A1.

[0095] The negative electrode of the present embodiment is lithium metal;

[0096] Lithium flakes can be made by:

[0097] In an argon-protected glove box, the dried lithium plates were rolled into flakes with a thickness of 0.4 mm.

[0098] The metal lithium prepared in the above steps of the present invention is detected. see image 3 , image 3 The X-ray diffraction patterns of the initial state of the lithium negative electrode prepared in Example 1 of the present invention, after 10 cycles, after 20 cycles and after 50 cycles.

[0099] The positive electrode in this embodiment is composed of conductive carbon black and ...

Embodiment 2

[0117] This embodiment provides a lithium-oxygen secondary battery based on a highly reversible lithium negative electrode (high cycle life lithium negative electrode), denoted as A2, and its structure is basically the same as that of the battery provided in Example 1. The amount of silicate / silane added was varied in this example.

[0118] In this embodiment, the amount of silicate / silane added accounts for 1 wt% of the electrolyte.

[0119] The morphology of the lithium negative electrode of the lithium-oxygen battery assembled in the above steps of the present invention is analyzed.

[0120] see Figure 8 , Figure 8 Scanning electron microscope pictures of the lithium negative electrode of the lithium-oxygen secondary battery prepared in Example 2 of the present invention after 10 cycles. Depend on Figure 8 It can be seen that after 10 cycles, the surface of metal lithium is uneven, indicating that the surface is corroded seriously.

[0121] The electrochemical test ...

Embodiment 3

[0124] This embodiment provides a lithium-oxygen secondary battery based on a highly reversible lithium negative electrode (high cycle life lithium negative electrode), denoted as A3, and its structure is basically the same as that of the battery provided in Example 1. The amount of silicate / silane added was varied in this example.

[0125] In this embodiment, the addition amount of silicate / silane accounts for 10 wt% of the electrolyte solution.

[0126] The morphology of the lithium negative electrode of the lithium-oxygen battery assembled in the above steps of the present invention is analyzed.

[0127] see Figure 10 , Figure 10 Scanning electron microscope pictures of the lithium negative electrode of the lithium-oxygen secondary battery prepared in Example 3 of the present invention after 10 cycles. Depend on Figure 10 It can be seen that after 10 cycles, there is no obvious corrosion on the surface, indicating that the protection performance is good.

[0128] Th...

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Abstract

The invention provides an electrolyte for a lithium secondary battery, the electrolyte includes a material which can be reacted with a corrosion matter on the surface of a negative electrode of the lithium secondary battery to form a silicon-containing protection layer, and the lithium secondary battery includes a lithium-oxygen secondary battery or a lithium-sulfur battery. According to the characteristic that corrosion matter lithium hydroxide is formed inevitably on the lithium surface of the lithium secondary battery of the opening system, a silicate material and / or silane material are / is added in the electrolyte, and the silicate material and / or the silane material are / is easy to react with the lithium hydroxide to form a silicon-containing protection film, further erosion of the lithium negative electrode can be effectively prevented, and with the charge and discharge, silicate / silane in the electrolyte can dynamically repair of the protective film, namely, growth of the protection film is continued on the corroded lithium surface, in the circulating charge and discharge process, the lithium negative electrode can be dynamically protected in real time in situ, the effect is better, the protective layer is more compact, metal lithium corrosion can be effectively reduced, and the metal lithium reversibility can be significantly improved.

Description

technical field [0001] The invention relates to the technical field of metal-air or lithium-sulfur secondary batteries, relates to an electrolyte solution for a lithium secondary battery and a lithium-oxygen secondary battery, in particular to a lithium-oxygen secondary battery or a lithium-sulfur secondary battery Electrolyte and lithium-oxygen secondary battery with self-healing ability. Background technique [0002] Air battery is a kind of chemical battery. Its construction principle is similar to that of dry battery. The difference is that its positive electrode active material is taken from oxygen or pure oxygen in the air. It is also called oxygen battery. It is usually divided into lithium-air battery according to the negative electrode material. , Zinc-air batteries, aluminum-air batteries and magnesium-air batteries. [0003] Lithium-oxygen batteries have a higher energy density than lithium-ion batteries. In theory, oxygen is not limited as a positive electrode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M12/08H01M2/16H01M4/66H01M4/90H01M4/62
CPCH01M4/622H01M4/623H01M4/625H01M4/661H01M4/663H01M4/9016H01M4/9041H01M10/0566H01M12/08H01M50/431H01M50/44H01M50/409Y02E60/10
Inventor 张新波于越鲍迪徐吉静
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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