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Integrated composite electrode material, preparation method thereof and application thereof

A composite electrode and electrode sheet technology, applied in electrode manufacturing, battery electrode, electrolyte battery manufacturing, etc., can solve the problems of increased internal resistance of all-solid-state lithium-ion batteries, poor battery cycle performance, and difficulty in engineering. Achieve cost and labor savings, improve battery performance, and cost-effectiveness

Inactive Publication Date: 2019-08-16
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid electrolyte / electrode interface is difficult to fully contact, the components diffuse or even react with each other, and form a space charge layer, which leads to a sharp increase in the internal resistance of the all-solid-state lithium-ion battery and poor battery cycle performance.
At present, the solution to the interface problem of solid electrolyte mainly includes coating ionic liquid between the electrode material and the electrolyte to increase the wettability between the two. However, this method has many uncontrollable factors, poor operability, and the formation of The interface is also uneven and unstable, making it difficult to engineer

Method used

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  • Integrated composite electrode material, preparation method thereof and application thereof
  • Integrated composite electrode material, preparation method thereof and application thereof
  • Integrated composite electrode material, preparation method thereof and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Step 1: Evenly disperse the active material-lithium cobaltate, the conductive agent-conductive carbon black and the binder-PVDF in NMP with a mass ratio of 8:1:1, coat the dispersion on aluminum foil and dry it Preparation of electrode pole pieces;

[0047] Step 2: The polymer electrolyte polyvinylidene fluoride-hexafluoropropylene, lithium salt LiClO 4 and inorganic solid electrolyte lithium lanthanum titanium oxide particles are dissolved in acetonitrile to prepare spinning solution, wherein the concentration of polymer electrolyte is 10wt%, the mass ratio of lithium salt and polymer electrolyte is 0.05, the mass ratio of inorganic solid electrolyte and polymer electrolyte is 0.05;

[0048] Step 3: Use the electrode pole piece obtained in Step 1 as the receiving end of electrospinning, the electrospinning voltage is 15kV, the receiving distance is 20cm, the temperature is 20°C, the humidity is 40%RH, the diameter of the spinning fiber is controlled to be 50nm, and th...

Embodiment 2

[0052] Step 1: Evenly disperse the active material-nickel cobalt lithium manganate, conductive agent-Ketjen black and binder-PVDF in NMP with a mass ratio of 95:2:3, and coat the dispersion on aluminum foil and drying to prepare electrode sheets;

[0053] Step 2: The polymer electrolyte polyacrylonitrile, lithium salt LiPF 6 and inert filler aluminum oxide particles are dissolved in acetonitrile to prepare spinning solution, wherein the concentration of polymer electrolyte is 8wt%, the mass ratio of lithium salt and polymer electrolyte is 0.1, and the mass ratio of inorganic solid electrolyte and polymer electrolyte is 0.1;

[0054] Step 3: Use the electrode pole piece obtained in Step 1 as the receiving end of electrospinning, the electrospinning voltage is 18kV, the receiving distance is 15cm, the temperature is 40°C, the humidity is 20%RH, the diameter of the spinning fiber is controlled to be 30nm, and the fiber is For conjugate orientation, the spinning solution is spun...

Embodiment 3

[0057] Step 1: Evenly disperse the active material-silicon carbon material, conductive agent-carbon nanotubes and binder-PTFE in water with a mass ratio of 94:3:3, coat the dispersion on copper foil and dry it Preparation of electrode pole pieces;

[0058] Step 2: Dissolving the polymer electrolyte polyethylene oxide, lithium salt LiTFSI and inorganic solid electrolyte lithium titanium aluminum phosphate particles in DMF to prepare a spinning solution, wherein the concentration of the polymer electrolyte is 12wt%, the quality of the lithium salt and the polymer electrolyte The ratio is 0.2, and the mass ratio of the inorganic solid electrolyte and the polymer electrolyte is 0.2;

[0059] Step 3: Use the electrode pole piece obtained in Step 1 as the receiving end of electrospinning, the electrospinning voltage is 20kV, the receiving distance is 10cm, the temperature is 30°C, the humidity is 30%RH, the diameter of the spinning fiber is controlled to be 80nm, and the drum is par...

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Abstract

The invention discloses an integrated composite electrode material, a preparation method and application thereof. The integrated composite electrode material includes an electrode pole piece of an active material and a solid electrolyte layer which is located on a surface layer of the electrode pole piece and is integrated with the surface layer of the electrode pole piece to form an integrated structure. The solid electrolyte layer includes a solid electrolyte and a lithium salt, the solid electrolyte is a polymer electrolyte and / or an organic / inorganic composite solid electrolyte. Accordingto the composite electrode and the preparation method thereof provided by the invention, the wettability and contact between the electrode pole piece and the solid electrolyte can be improved, and thecycle performance of the battery is improved. The high-performance electrode material is achieved with an economical cost, the material is widely applicable to the preparation of positive and negative electrode pole pieces of a battery, and the invention has great significance for improving the cycle performance of a solid-state battery.

Description

technical field [0001] The invention relates to an integrated composite electrode material and its preparation method and application, belonging to the technical field of batteries. Background technique [0002] Different from traditional liquid lithium batteries, solid-state batteries are batteries that use solid electrodes and solid electrolytes. Since both electrodes and electrolytes of solid-state batteries are made of solid materials, the solid-state electrolyte is non-flammable, non-corrosive, non-volatile, and non-leakage. It also overcomes the phenomenon of lithium dendrites. Even if it is heated to a very high temperature, it will not fire, and thus greater safety. In addition, solid-state batteries also have outstanding advantages such as lighter weight, thinner thickness, smaller volume, more flexibility, and higher energy density. A more suitable choice to improve defense power. At present, the main problem limiting the application of all-solid-state lithium b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0562H01M10/0565H01M10/058H01M4/04D01D5/00
CPCD01D5/003D01D5/0084H01M4/0402H01M10/052H01M10/0562H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 王晨彭思侃燕绍九王楠王继贤
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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