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Modified lithium-based composite negative material for solid state battery and preparation and application of material

A negative electrode material and solid-state battery technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as difficult large-scale production and expensive methods, achieve inhibited growth, increase limit current density, and reduce interface impedance Effect

Inactive Publication Date: 2019-06-04
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can reduce the interfacial impedance between the solid electrolyte and the metal lithium anode, from the perspective of practical application, the method is expensive and not easy to scale up.

Method used

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  • Modified lithium-based composite negative material for solid state battery and preparation and application of material
  • Modified lithium-based composite negative material for solid state battery and preparation and application of material
  • Modified lithium-based composite negative material for solid state battery and preparation and application of material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Commercial melamine powder was pyrolyzed at 550 °C in air for 4 hours to obtain graphitized carbon nitride (g-C 3 N 4 ) powder, where the heating rate is 5°C / min.

[0039] In a high-purity argon atmosphere, lithium metal with a purity of battery grade and pyrolyzed g-C 3 N 4 The powder is mixed according to the mass ratio of 9:1 and placed in a high-temperature stirrer. The high-temperature stirrer is heated to 280°C to melt the metal lithium. At a constant temperature, the molten metal lithium is continuously stirred to fully mix with the carbon nitride powder. The stirring speed is 60r / min, and the time is 40min.

[0040] Lithium metal and g-C 3 N 4 After the powder is mixed evenly, preheat the polished lithium lanthanum zirconium oxide ceramic sheet to 280°C, and then evenly coat the above-mentioned modified lithium-based composite negative electrode material on the ceramic sheet, place it at room temperature, and let it cool down and solidify .

[0041] The a...

Embodiment 2

[0051] In a high-purity argon atmosphere, mix battery-grade lithium metal and commercial boron nitride powder in a mass ratio of 9:1 and put them in a high-temperature stirrer. After the temperature is heated to 300°C to melt the lithium metal, control Constant temperature, under the action of mechanical stirring of stainless steel stirrer, the rotating speed is 80r / min, and the time is 60min. After the constant temperature stirring is completed, the heat supply of the high temperature stirrer is stopped, so that the lithium-boron nitride composite negative electrode material is gradually cooled down to room temperature.

[0052] The solidified composite negative electrode material is rolled and thinned by using a roller press, and the porous copper foil is used as a metal current collector, and the thinned lithium-boron nitride composite negative electrode material is transferred to the porous copper foil.

[0053] The selected porous copper foil is 200 mesh, the thickness is...

Embodiment 3

[0056] In a high-purity argon atmosphere, mix battery-grade lithium metal and commercial aluminum nitride powder in a mass ratio of 8:2 and put them in a high-temperature stirrer. After the temperature is heated to 250°C to melt the lithium metal, control Constant temperature, under the action of mechanical stirring of stainless steel stirrer, the rotating speed is 90r / min, and the time is 20min. After the constant temperature stirring is completed, the heat supply of the high temperature stirrer is stopped, so that the lithium-aluminum nitride composite negative electrode material is gradually cooled and solidified.

[0057] After preheating the polished lithium lanthanum zirconium oxide ceramic sheet to 250°C, the uniformly stirred lithium-aluminum nitride compound is evenly coated on the ceramic sheet, and placed at room temperature to cool down and solidify.

[0058] The amount of coating on the ceramic sheet is based on the coated lithium-aluminum nitride composite powder...

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Abstract

The invention relates to a modified lithium-based composite negative material for a solid state battery and preparation and application of the material. The modified lithium-based composite negative material comprises 50-95 parts of lithium and 5-50 parts of a modified additive by weight; and the modified additive comprises one or multiple nitride or fluoride. The preparation method comprises thatthe lithium and modified additive are mixed, heated to 180-400 DEG C, stirred uniformly, and cooled to the room temperature; and the modified composite negative material is used to the solid state battery, and combined with a solid electrolyte. Compared with the prior art, the lithium metal is mixed with the modified additive by mixing in a heating fusing way, the surface energy of the lithium metal can be reduced effectively, elements including nitrogen and fluorine are introduced in a controllable way, the interfacial resistance between the solid electrolyte and lithium cathode is reduced effectively, the limit current that can be born by the solid electrolyte is increased, the recyclable charge and discharge capacity is improved, and the solid electrolyte and cathode interface is stable for a longer time in the long circulation process.

Description

technical field [0001] The invention belongs to the technical field of solid-state lithium batteries (lithium-ion batteries), and relates to a modified lithium-based composite negative electrode material for solid-state batteries and its preparation and application. Background technique [0002] With the continuous development of science and technology and the successful application of lithium-ion batteries in human production and life, rechargeable lithium-ion batteries are widely regarded as energy storage devices with light weight and high energy density. The world's first rechargeable lithium-ion battery, which was born in the 1880s, used metal lithium as the negative electrode. This rechargeable lithium-ion battery will be generated due to the uneven deposition of lithium ions on the metal lithium negative electrode during the charge-discharge cycle. Lithium dendrites, which in turn cause serious safety problems, therefore, rechargeable lithium-ion batteries using metal...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/1395H01M4/04H01M10/0525
CPCY02E60/10
Inventor 罗巍黄瑛段建黄云辉温佳蕴伍旺炎
Owner TONGJI UNIV
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