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Preparation method of crystalline Cu2O composite metal lithium negative electrode

A composite metal and lithium negative electrode technology, which is applied to battery electrodes, lithium batteries, structural parts, etc., can solve the problems of non-dense deposition structure and uncontrollable deposition and peeling morphology, and achieve smooth and dense electrode surface, easy continuous mass production, Effect of High Coulombic Efficiency

Pending Publication Date: 2022-04-12
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the deposition and peeling morphology of the existing metal lithium on the Cu current collector is uncontrollable, resulting in the formation of non-dense deposition structures such as moss lithium and dendrite lithium during cycle charge and discharge, and to provide a crystalline Cu 2 Preparation method of O composite metal lithium negative electrode

Method used

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  • Preparation method of crystalline Cu2O composite metal lithium negative electrode
  • Preparation method of crystalline Cu2O composite metal lithium negative electrode
  • Preparation method of crystalline Cu2O composite metal lithium negative electrode

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Experimental program
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specific Embodiment approach 1

[0022] Specific implementation mode one: a kind of crystalline Cu in this implementation mode 2 The preparation method of O composite metal lithium negative electrode, it realizes in the following steps:

[0023] 1. The commercial Cu current collector is ultrasonically cleaned with hydrochloric acid with a concentration of 36% to 38% by weight for 1 to 5 minutes to obtain a Cu current collector with the surface oxide layer removed, then ultrasonically cleaned with absolute ethanol for 1 to 5 minutes, and then deionized Washing with water and drying to obtain a clean current collector;

[0024] 2. Put the above-mentioned clean Cu current collector in a tube furnace device, vacuumize and pass in an inert protective gas, and raise the temperature to 500-900°C at a rate of 5-10°C / min, then pass in oxygen, and Under the condition of 500-900°C heat preservation, oxidize the Cu current collector for 10-480min, stop feeding oxygen after the end, cool down to 300°C at a rate of 2-10°C...

specific Embodiment approach 2

[0029] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the commercial Cu current collector in step 1 is Cu foam, Cu foil or Cu mesh. Other steps and parameters are the same as those in Embodiment 1.

[0030] The commercial Cu current collectors described in this embodiment are commercially available.

specific Embodiment approach 3

[0031] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that in step 1, the commercial Cu current collector is ultrasonically cleaned with hydrochloric acid with a concentration of 37% by weight for 3 minutes. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a preparation method of a crystalline Cu2O composite metal lithium negative electrode, and belongs to the field of secondary batteries. The method solves the problem that the deposition stripping morphology of existing metal lithium on a Cu current collector is uncontrollable, so that moss lithium, dendrite lithium and other incompact deposition structures are generated in cyclic charging and discharging. The method comprises the following steps: 1, preparing a clean Cu current collector; 2, heating in an inert atmosphere, and preserving heat in low-pressure oxygen to prepare a crystal Cu2O modified Cu current collector; and 3, assembling the Li-Cu half battery, carrying out constant-current discharge lithium plating, and disassembling to obtain the crystallized Cu2O composite metal lithium negative electrode. The product is stable in performance, the preparation process is simple, the process cost is low, and continuous mass production is easy; the crystalline Cu2O composite metal lithium negative electrode has the advantages of cycle stability, excellent rate capability, deep charge-discharge performance and high and stable coulombic efficiency. After multiple times of charging and discharging, the surface of the electrode is flat and compact, and no obvious dendritic lithium is formed. The method is suitable for preparing the metal lithium negative electrode.

Description

technical field [0001] The invention belongs to the field of secondary batteries, in particular to a crystalline Cu 2 The invention discloses a preparation method of an O composite metal lithium negative electrode. Background technique [0002] With the rapid development of the world economy and the increasing consumption of traditional fossil resources such as coal and oil, global warming and environmental degradation have become crises and challenges faced by all countries in the world. In order to ensure the sustainable development of my country's economy, my country put forward the grand goal of "peaking carbon emissions before 2030 and neutralizing carbon emissions before 2060" at the United Nations General Assembly. In order to realize the carbon neutral strategy, the development of green clean energy and related advanced energy storage technologies is imminent. [0003] Compared with traditional lithium-ion batteries, metal lithium batteries are attracting increasin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/131H01M4/66H01M10/052
Inventor 亓钧雷蔡逸飞秦斌曹健冯吉才
Owner HARBIN INST OF TECH
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