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Preparation method of negative electrode of metal lithium secondary battery

A secondary battery and metal lithium technology, applied in secondary batteries, electrode manufacturing, battery electrodes, etc., can solve problems such as weakening

Active Publication Date: 2018-01-09
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the additives so far improve or inhibit the formation of dendrites by participating in the formation of a protective film, and such additives generally weaken as the number of cycles increases

Method used

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  • Preparation method of negative electrode of metal lithium secondary battery
  • Preparation method of negative electrode of metal lithium secondary battery
  • Preparation method of negative electrode of metal lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of preparation method of metal lithium secondary battery that aluminum foil is used as negative electrode protection, the steps are as follows:

[0032] 1) Weigh 32mg LiFePO 4 The powder is used as the positive electrode active material, 4mg Ketjen black is used as the conductive agent, and 80uL, the concentration is 50mg mL -1 The polyvinylidene fluoride (PVDF) solution (solvent is N-methylpyrrolidone (NMP)) is used as a binding agent, and 3ml NMP is added dropwise as a dispersant, and ball milled in a ball mill tank for 5h to make a slurry one;

[0033] 2) Apply the slurry evenly on the front of the scrubbed clean current collector (that is, the matte surface of the single-sided glossy aluminum foil with a thickness of 16±2um, purchased from Kejing Company) with a doctor knife. Make electrode sheets with a coating thickness of 200 μm, vacuum dry overnight at 90°C and cool down naturally;

[0034] 3) Cut the dried and naturally cooled electrode sheets into ele...

example 1

[0040] The assembly of lithium metal battery described in example one is as follows figure 1 As shown, the method is to assemble a button-type lithium metal battery with a battery model of CR 2032 in a glove box filled with an argon atmosphere. This method is a known technology, briefly described as follows: in a glove box full of argon atmosphere, according to figure 1 ① Negative shell, ② shrapnel, ③ spacer (16mm in diameter), ④ lithium sheet (16mm in diameter), ⑤ 600nm aluminum foil, ⑥ separator (Celgard 2400, 19mm in diameter), here the separator should completely separate the positive and negative electrodes. Therefore, it must be larger than the diameter of the lithium sheet, which is 19mm), ⑦ positive electrode material (LiFePO 4 ), ⑧ Assembling button batteries in the order of the positive shell, wherein, before and after placing the separator, 2-3 drops of electrolyte (LiPF 6 (EC:DEC=1:1)) On the surface of the aluminum foil, the in-situ alloying reaction between the...

Embodiment 2

[0043] A kind of preparation method of metal lithium secondary battery that aluminum foil is used as negative electrode protection, the steps are as follows:

[0044] Step 1) is identical with embodiment 1;

[0045] 2) Change the thickness of the coating film to 300 μm, and keep other conditions unchanged;

[0046] 3) same as embodiment 1;

[0047] 4) Select the electrode sheet to control the active material loading to about 3.0 mg cm -2

[0048] 5) The remaining steps are similar to those in the embodiment, and the obtained charge-discharge cycle curve is similar to that in embodiment 1.

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Abstract

The invention discloses a preparation method of a negative electrode of a metal lithium secondary battery. According to the method, the surface of the original metal lithium negative electrode is coated with a layer of aluminum foil with thickness of about 600nm; and in a battery assembling process, an electrolyte is dropwise added to the aluminum foil, and the electrolyte and the aluminium foil react quickly to form lithium aluminium alloy. By virtue of the preparation method, an adverse reaction generated by direct contact between metal lithium with overhigh activity and the electrolyte canbe prevented, and lithium dendrites formed by the uneven lithium ion deposition process can be reduced, thereby greatly relieving the problem of constant electrolyte consumption and severe lithium negative electrode corrosion to a certain degree, and further prolonging the cycle life of the battery.

Description

technical field [0001] The invention relates to a negative electrode containing metallic lithium, in particular to a metallic lithium secondary battery with aluminum foil as negative electrode protection and a design method thereof, belonging to the related field of battery technology. Background technique [0002] Since the beginning of the 21st century, due to the further increase of people's demand for traditional fossil fuels, the price of fossil fuels has gradually increased, and the environmental pollution and greenhouse effect caused by the combustion of fossil fuels have become more serious. Therefore, it is imminent to seek new environmentally friendly energy sources for sustainable development. The field of new secondary batteries and related materials came into being under such a dual background. Lithium-ion batteries (LIBs) are the most commonly used electrochemical energy storage devices and have been extensively studied due to their high energy density compare...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/58H01M4/66H01M4/36H01M4/38H01M4/134H01M10/0525
CPCY02E60/10
Inventor 刘喜正张瑞娥马文庆丁轶
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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