Composite metal material, preparation method and application thereof, high-energy density battery and symmetrical button cell

A technology of composite metal materials and metal electrodes, which is applied in the direction of cylindrical shell batteries/batteries, battery electrodes, secondary batteries, etc., to achieve the effect of inhibiting the growth of metal dendrites and improving surface tension

Inactive Publication Date: 2020-07-03
BEIJING INST OF NANOENERGY & NANOSYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the limitation of the applicable field of suppressing metal dendrite growth existing in the prior art, to provide a composite metal material and its preparation method and application, a high energy density battery and a symmetrical button battery. Metal materials can inhibit the growth of metal dendrites, and when they are used to prepare batteries, they can be applied to various types of electrolytes, and the obtained batteries have excellent cycle performance and broad application prospects

Method used

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  • Composite metal material, preparation method and application thereof, high-energy density battery and symmetrical button cell
  • Composite metal material, preparation method and application thereof, high-energy density battery and symmetrical button cell
  • Composite metal material, preparation method and application thereof, high-energy density battery and symmetrical button cell

Examples

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Effect test

preparation example 1

[0064] In an argon-filled glove box, the composite metal electrode material is used as the metal electrode of the battery and the electrolyte is assembled into a button battery (R2032) for a symmetrical battery. The electrolyte is a flame-retardant phosphate electrolyte, and the phosphate electrolyte is TMP and FEC, wherein the volume content of FEC is 5%, and 1 mole of NaPF is dissolved in the electrolyte 6 The amount of electrolyte used is 50 ml.

preparation example 2

[0066] The battery positive electrode slurry is composed of Na with a mass ratio of 80% 3 V 2 (PO 4 ) 3 , 15% acetylene black and 5% polyvinylidene fluoride (PVDF), the slurry is coated on Al foil, dried in vacuum at 120°C for 12 hours, then cut into electrode sheets, and weighed for later use. Among them, the active material loading of the positive electrode material is 5.5 mg / cm2. The negative electrode of the battery is a composite metal material, and the electrolyte is a flame-retardant phosphate electrolyte. The phosphate electrolyte is TMP and FEC, wherein the volume content of FEC is 5%, and 1 mole of NaPF is dissolved in the electrolyte 6 , the amount of electrolyte is 50 milliliters.

[0067] Electrochemical performance test

[0068] The cycle performance of the battery was tested on a battery tester (LAND CT2001A).

[0069] The appearance and morphology of the composite metal electrode after cycling were characterized by scanning electron microscopy (SEM).

[...

Embodiment 1

[0072] Preparation of the composite metal material: in a nitrogen atmosphere, bismuth Bi is added to the powder of the alkali metal Na, and the composite metal is uniformly obtained by mechanical mixing. Then, a composite metal electrode pole piece A1 with a diameter of 10 mm and a thickness of 200 microns was obtained by casting. Among them, the content of Na is 90wt%, and the content of Bi is 10wt%.

[0073] Assemble the battery according to Preparation Example 1, wherein the electrolyte carbonate electrolyte, wherein the carbonate electrolyte is EMC and DMC, and the volume ratio of the two is 6:4, and 1 mole of NaPF is dissolved in the electrolyte 6 , the cycle performance diagram of the battery when the current density is 0.5 mA / cm2 and the capacity is 0.5 mA / cm2 is as follows figure 1 (a) shown. Depend on figure 1 (a) It can be seen that the symmetric battery exhibits a stable and small overpotential after the first few cycles and can continue to cycle stably. It show...

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Abstract

The invention relates to the field of batteries, and discloses a composite metal material, a preparation method and application thereof, a high-energy density battery and a symmetrical button battery.The composite metal material comprises a first metal phase and a second metal phase. The first metal phase is selected from at least one of lithium, sodium and potassium; the second metal phase is selected from at least one of bismuth, antimony, indium, tin and gallium; based on the total weight of the negative electrode material, the content of the first metal phase is 80-99wt%, and the contentof the second metal phase is 1-20wt%. The composite metal material can inhibit the growth of metal dendrites, and can be suitable for various different electrolyte types when being used for preparingbatteries, and the obtained batteries have excellent cycle performance and wide application prospects.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a composite metal material, a preparation method and application thereof, a high energy density battery and a symmetrical button battery. Background technique [0002] In recent years, lithium / sodium-metal batteries have attracted extensive attention from researchers due to their high energy density. However, during cycling, the growth of metal dendrites in the battery severely restricts the practical application of such batteries. In response to the problem of metal dendrite growth, researchers have solved the dendrite growth in metal negative electrodes by improving the battery electrolyte, modifying the surface of the metal negative electrode, and adopting a porous framework to accommodate the metal. Inhibiting the growth of metal dendrites from the perspective of electrolyte is mainly achieved by changing the composition and concentration of the electrolyte. By adding a small amoun...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M10/0525H01M10/054H01M10/04
CPCH01M4/381H01M4/628H01M10/0427H01M10/0525H01M10/054H01M2004/027Y02E60/10Y02P70/50
Inventor 孙春文易强杨国鹏
Owner BEIJING INST OF NANOENERGY & NANOSYST
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