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Lithium metal-based battery taking copper selenide in-situ coated foamy copper as lithium metal carrier and preparation method of lithium metal-based battery

An in-situ coating and foaming copper technology, applied in the field of electrochemistry, can solve the problems of poor cycle performance, potential safety hazards, and low Coulomb efficiency of battery systems, and achieve the advantages of inhibiting lithium dendrite growth, reducing overpotential, and reducing specific surface area. Effect

Active Publication Date: 2021-02-26
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nevertheless, Li dendrites will continue to grow at the bottom of the SEI film, causing problems such as poor cycle performance of the battery system, low Coulombic efficiency, and potential safety hazards.

Method used

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  • Lithium metal-based battery taking copper selenide in-situ coated foamy copper as lithium metal carrier and preparation method of lithium metal-based battery
  • Lithium metal-based battery taking copper selenide in-situ coated foamy copper as lithium metal carrier and preparation method of lithium metal-based battery
  • Lithium metal-based battery taking copper selenide in-situ coated foamy copper as lithium metal carrier and preparation method of lithium metal-based battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In this example, see figure 1 , a method for preparing a lithium metal-based battery in which copper selenide is in-situ coated with copper foam as a lithium metal carrier, comprising the following steps:

[0051] (1) Synthetic selenic acid mixed solution:

[0052] Add 2 mass parts of chloroplatinic acid and 100 mass parts of distilled water into the beaker, stir evenly, dissolve selenium dioxide in the aqueous solution to obtain a selenic acid mixed solution, and set aside;

[0053] (2) Preparation of copper selenide in-situ coated foamed copper current collector:

[0054] (2-1) Purify and pretreat the copper foam net, the steps are as follows:

[0055] (2-1-1) First, pickle the foamed copper mesh with dilute hydrochloric acid, using dilute hydrochloric acid with a concentration of 5% by mass, controlling the temperature at 30°C, and pickling time for 10 minutes;

[0056] (2-1-2) Then use alcohol supplemented by ultrasonic vibration to clean the foamed copper mesh 3...

Embodiment 2

[0071] This embodiment is basically the same as Embodiment 1, especially in that:

[0072] In this example, see figure 1 , a method for preparing a lithium metal-based battery in which copper selenide is in-situ coated with copper foam as a lithium metal carrier, comprising the following steps:

[0073] (1) Synthetic selenic acid mixed solution:

[0074] The chloroplatinic acid of 5 mass parts, the distilled water of 80 mass parts are added in the beaker, stir evenly, selenium dioxide is dissolved in aqueous solution, obtain selenic acid mixed solution, for subsequent use;

[0075] (2) Preparation of copper selenide in-situ coated foamed copper current collector:

[0076] (2-1) Purify and pretreat the copper foam net, the steps are as follows:

[0077] (2-1-1) First, pickle the foamed copper mesh with dilute hydrochloric acid, using dilute hydrochloric acid with a mass percentage concentration of 3%, controlling the temperature at 20°C, and pickling time for 5 minutes;

[...

Embodiment 3

[0089] This embodiment is basically the same as the previous embodiment, and the special features are:

[0090] In this example, see figure 1 , in the step (4-3), assemble the full battery, the positive electrode of the full battery uses lithium cobaltate electrode or the aluminum foil collector composite electrode coated with LiFePO4 (LFP), and the negative electrode uses the selenium prepared in the step (3) CuCu in-situ coated foam copper / lithium metal composite electrode. Assemble the full battery and assemble it into a button battery in a glove box. The glove box is an argon atmosphere, and the oxygen value of water is 0.1ppm; the electrolyte of the symmetrical battery and the full battery is 1mol LiPF 6 Dissolved in 1L of EC:DEC mixed solution electrolyte, the volume ratio of EC and DEC in the electrolyte of the EC:DEC mixed solution is 1:2, and contains FEC additive with a mass percentage of 10%.

[0091] In this example, a full battery is prepared, and the negative e...

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Abstract

The invention discloses a lithium metal-based battery taking copper selenide in-situ coated foamy copper as a lithium metal carrier and a preparation method of the lithium metal-based battery. The preparation method comprises the following specific steps: (1) dissolving selenium dioxide in an aqueous solution; (2) immersing the purified foamy copper into a solution; (3) putting the soaked modifiedfoamy copper into a vacuum drying oven for drying; (4) carrying out lithium metal loading and electrochemical performance characterization on the copper selenide in-situ coated foamy copper current collector obtained after modification. According to the invention, liquid-phase selenylation is adopted to carry out surface lithium-affinity modification on low-price foamy copper, the foamy copper iscompounded with lithium metal, and the chemical composition, multi-dimensional interpenetrating structure and good conductivity of the foamy copper and the lithium affinity of a surface layer are utilized to achieve the effects of accommodating and uniformizing lithium nucleation, inhibiting lithium dendritic crystal growth and improving the performance of the lithium ion battery. And finally, the coulombic efficiency and the cycle performance of the lithium metal negative electrode are improved. The method has the advantages of short production period, simple process, low production cost andhigh cycling stability.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a preparation method of a lithium metal-based battery in which copper selenide is in-situ coated with foamed copper as a lithium metal carrier. Background technique [0002] Lithium-ion batteries are widely used in smart portable electronic products and electric vehicles. At present, graphite materials are the mainstream commercial lithium battery anode materials, but their theoretical capacity is low, which cannot meet people's needs for high energy density and high power density rechargeable batteries. . Lithium (Li) anode has an ultra-high theoretical specific capacity (3860mA h g -1 ), extremely low redox potential (-3.04V vs. SHE) and low density (0.53g cm -3 ) and other characteristics, it is considered to be the most likely negative electrode material to replace graphite. However, lithium metal still faces severe challenges in its practical applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/66H01M4/62H01M4/80H01M10/052C23C26/00C23G1/10
CPCH01M4/667H01M4/661H01M4/808H01M4/628H01M10/052H01M10/058C23G1/103C23C26/00H01M2004/021H01M2004/027Y02E60/10Y02P70/50
Inventor 傅倩茹邵勤思颜蔚王健宜陈春华
Owner SHANGHAI UNIV
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