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Ethyl acrylate compound used as electrolyte additive, electrolyte, secondary battery based on aluminum negative electrode and preparation method thereof

An ethyl acrylate and secondary battery technology, applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of affecting battery cycle stability, high cost of additive preparation, unstable SEI film, etc. Improve cycle stability, improve cycle stability and reduce side reactions

Active Publication Date: 2021-01-19
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also some problems when aluminum foil is used as the negative electrode: (1) Lithium ions experience huge volume expansion during the alloying process with aluminum metal, resulting in electrode pulverization and battery capacity attenuation; (2) metal aluminum and electrolyte react at the interface The formed solid electrolyte layer (Solid Electrolyte Interface, SEI film) thickens with time, the interface impedance continues to increase, the Coulombic efficiency decreases, and the battery capacity decays; (3) due to the continuous change in the volume of the aluminum metal negative electrode during charge and discharge, the SEI film Unstable, in the process of lithium deintercalation, continuous generation-breakage-regeneration, consumption of metal lithium and electrolyte
However, the above-mentioned electrolyte additives are suitable for improving the interface reaction between the traditional lithium-ion battery electrode material and the electrolyte, and the preparation cost of the additive is relatively high, and the operation process is relatively complicated.
At present, there are no reports on electrolyte additives based on aluminum negative electrodes in secondary batteries, used to improve the volume expansion of aluminum negative electrodes during charge and discharge, and to form SEI films that affect battery cycle stability.

Method used

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  • Ethyl acrylate compound used as electrolyte additive, electrolyte, secondary battery based on aluminum negative electrode and preparation method thereof
  • Ethyl acrylate compound used as electrolyte additive, electrolyte, secondary battery based on aluminum negative electrode and preparation method thereof
  • Ethyl acrylate compound used as electrolyte additive, electrolyte, secondary battery based on aluminum negative electrode and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0133] The preparation method of the secondary battery based on the aluminum negative electrode has simple production process and low cost.

[0134] As a preferred embodiment, the preparation method of the secondary battery based on the aluminum negative electrode comprises the following steps:

[0135] a) Preparing the negative electrode: cleaning, cutting and drying the aluminum foil of the negative electrode to obtain a negative electrode of the desired size;

[0136] b) Electrolyte preparation: dissolve the lithium salt electrolyte in a corresponding non-aqueous solvent, add ethyl acrylate compounds, and mix thoroughly to obtain an electrolyte;

[0137] c) Preparing the diaphragm: cutting the diaphragm into the required size, cleaning and drying;

[0138] d) Prepare the positive electrode: mix the active material of the positive electrode material, the conductive agent, the binder, and the solvent to form a slurry; then evenly coat the positive electrode material slurry o...

Embodiment 1

[0146] A dual-ion battery based on an aluminum negative electrode, including a negative electrode, a separator, an electrolyte, and a positive electrode.

[0147] Prepare the negative electrode: clean the negative electrode aluminum foil, cut it into a disc with a diameter of 12mm, and dry it completely to obtain the negative electrode of the required size;

[0148] Preparation of the separator: the glass fiber film was cut into discs with a diameter of 16 mm and used as a separator for later use.

[0149] Preparation of electrolyte: Weigh 3.034g of lithium hexafluorophosphate and add it to 5mL of a mixed solvent of ethyl methyl carbonate and vinylene carbonate (volume ratio of 49:1), stir until potassium hexafluorophosphate is completely dissolved, then add 0.04g of α-cyanide Ethyl acrylate, stirred well and used as electrolyte for later use.

[0150] Preparation of positive electrode: Add 0.8g of expanded graphite, 0.1g of conductive carbon black, and 0.1g of polytetrafluor...

Embodiment 2-11

[0153] Example 2-11 is the same as that of Example 1 except that the positive electrode active material used in the preparation of the positive electrode is different, and all other steps and materials used are the same. The energy storage performance of the dual-ion battery of the aluminum negative electrode was tested and compared with the performance of Example 1 of the present invention. The battery test includes specific capacity, capacity retention after 500 cycles and Coulombic efficiency. The specific test methods are as follows:

[0154] Cycle charge and discharge: cycle charge and discharge are carried out on CT2001C-001 blue electric battery cycle test system, and the standard capacity of the electrode is tested by charging and discharging at a rate of 100mAh / g, the specific capacity of the material = current * time / sample mass, the energy density of the material = specific capacity of the material * platform voltage of the battery, coulombic efficiency of the mat...

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Abstract

The invention discloses an ethyl acrylate compound used as an electrolyte additive, an electrolyte, a secondary battery based on an aluminum negative electrode and a preparation method thereof, and relates to the field of electrochemical energy storage devices. The application of ethyl acrylate compounds as electrolyte additives in secondary batteries based on aluminum negative electrodes. The electrolyte solution contains an ethyl acrylate compound additive. An aluminum negative electrode-based secondary battery comprising the electrolyte. The present invention alleviates the problems of obvious volume expansion of the negative electrode aluminum foil, continuous formation-rupture-regeneration of the SEI film, and consumption of metal lithium and electrolyte during the charging and discharging process of the battery based on the aluminum negative electrode. The present invention uses ethyl acrylate compounds as The electrolyte additive is used. During the charge and discharge process, a stable and elastic SEI film is formed on the surface of the negative electrode aluminum foil, which relieves the volume expansion of the negative electrode, and at the same time isolates the interface reaction between the aluminum negative electrode and the electrolyte, reducing the consumption of lithium ions and electrolyte. Improve the cycle stability of the battery.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage devices, in particular to an ethyl acrylate compound used as an electrolyte additive, an electrolyte, a secondary battery based on an aluminum negative electrode, and a preparation method thereof. Background technique [0002] As a new type of electrical energy storage device, lithium-ion batteries are widely used in all walks of life. Its working principle is mainly that lithium ions shuttle back and forth in the process of charging and discharging, and rely on redox reactions to store energy. [0003] The traditional negative electrode material of lithium ion battery is graphite material. With the deepening of research, lithium ion battery with aluminum as negative electrode material has appeared (Advanced Energy Materials, 2016,6(11):1502588.), the negative electrode aluminum foil can be The integration of the negative electrode and the current collector reduces the tradi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0567H01M10/058H01M2300/0025Y02E60/10Y02P70/50
Inventor 唐永炳吴越张苗
Owner SHENZHEN INST OF ADVANCED TECH