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Preparation method for battery based on metal lithium powder and graphite negative electrode

A technology of metal lithium powder and graphite negative electrode, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of restricting the energy density of batteries, and achieve the advantages of large-scale industrial operation, simple preparation process, and easy scale-up production Effect

Inactive Publication Date: 2018-07-31
武汉理工力强能源有限公司
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AI Technical Summary

Problems solved by technology

[0003] Graphite is currently widely used as an anode material for lithium-ion batteries. Due to its theoretical capacity of only 372mAh / g, it restricts the energy density of the battery.

Method used

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Embodiment 1

[0025] The present invention provides a kind of preparation method based on metal lithium powder and graphite negative pole battery, comprises the following steps:

[0026] 1) Prepare the negative electrode lithium metal powder / graphite electrode sheet coated with the lithium metal powder layer on the surface: use lithium metal powder and graphite as the negative electrode active material, and use a SBR / toluene solution with a mass concentration of 2% to disperse, and then disperse the The slurry is coated on a rectangular graphite electrode sheet with a width of 60 mm and a length of 610 mm, with copper sheets as current collectors and nickel sheets as tabs;

[0027] Preparation of vanadium pentoxide positive electrode sheet: After mixing micron-sized vanadium pentoxide particles, conductive carbon, and binder PVDF according to the mass ratio of positive electrode active material 90:5:5, use NMP solvent to prepare slurry, and then evenly coat On the rectangular aluminum elect...

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Abstract

The invention provides a preparation method for a battery based on metal lithium powder and a graphite negative electrode. The preparation method comprises the following steps: preparing a metal lithium powder / graphite negative electrode slice and a vanadium pentoxide positive electrode slice; welding the tabs of the positive and negative electrode slices; preparing an organic solvent with a lithium hexafluorophosphate concentration of 1 mol / L as an electrolyte of the battery; cutting a Celgard polymer film used as a battery diaphragm into a rectangular piece with a width of 60 mm and a lengthof 610 mm; winding the electrode slices with a coiler so as to form a lithium battery cell; filling a cylindrical steel shell, with a bottom diameter of 18 mm and a height of 65 mm, with the lithiumbattery cell so as to form a 18650 type lithium battery cell, and transferring the 18650 type lithium battery cell to an argon-protected glove box; injecting the electrolyte; and carrying out sealingso as to obtain the finished soft pack battery. According to the invention, the lithium-free positive electrode material vanadium pentoxide is adopted, and the metal lithium powder is introduced intothe graphite negative electrode slice, so the 18650 type lithium battery cell is formed; and the preparation method has the advantages of simple process, easy enlargement production and large-scale application potential.

Description

technical field [0001] The invention relates to the technical field of electrochemical material manufacturing, in particular to a method for preparing a battery based on lithium metal powder and graphite negative electrode. Background technique [0002] Lithium-ion batteries are popular as power sources for mobile devices due to their high energy density, light weight, and long life. In 1991, Sony Corporation commercialized lithium-ion batteries for the first time, which has since opened up a global research boom in lithium-ion battery materials. However, as far as the energy density of the lithium-ion battery itself is concerned, its capacity is closely related to the type of electrode material. The development of high-capacity electrode materials has always been one of the core tasks of lithium-ion battery workers around the world. The current lithium-ion battery market mainly uses lithium iron phosphate and ternary materials as positive electrodes, and graphite material...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/62
CPCH01M4/48H01M4/625Y02E60/10
Inventor 吴黎明葛耀闻
Owner 武汉理工力强能源有限公司
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