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Pre-lithiated negative electrodes, secondary batteries including same, and methods for their manufacture

A secondary battery and pre-lithiation technology, which is applied in the field of secondary battery and the manufacture of the secondary battery, can solve the problems of metal lithium efficiency and lithium dendrite problem that have not been completely solved

Active Publication Date: 2020-02-07
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using metal lithium as the negative electrode can increase the energy density of the battery to 300wh / kg, but the efficiency of metal lithium and the problems of lithium dendrites have not been completely resolved

Method used

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  • Pre-lithiated negative electrodes, secondary batteries including same, and methods for their manufacture
  • Pre-lithiated negative electrodes, secondary batteries including same, and methods for their manufacture
  • Pre-lithiated negative electrodes, secondary batteries including same, and methods for their manufacture

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0081] First, according to the conventional method, the graphite negative electrode active material is coated on the surface of the copper current collector, and the surface capacity is 3mAh / cm 2 .

[0082] Next prepare the reaction buffer layer. 0.98 g of polyvinylidene fluoride (PVDF) was added to 9 g of N-methylpyrrolidone (NMP) solution, and stirred in a stirrer at a speed of 1000 rpm for 30 min. After the PVDF was completely dissolved, 0.02 g of ketjen carbon (KB) was added, and stirring was continued at 800 rpm for 100 min to prepare a uniform reaction buffer layer slurry. Next, the slurry was coated on the surface of the negative electrode active layer with a 50 μm doctor blade, and then baked in a drying oven at 55° C. for 24 h. It was made into a pole piece with a diameter of 14 mm, and placed in a vacuum oven at 120° C. for 6 hours.

[0083] Then, in a specific environment such as a glove box, assemble a secondary battery in the order of metal, separator, lithium-...

example 2

[0091] First, according to the conventional method, the mixed negative electrode active material of silicon oxide and graphite is coated on the surface of the copper current collector. The capacity of this material is 600mAh / g, and the surface capacity of the coating is 3mAh / cm 2 .

[0092] Next prepare the reaction buffer layer. 0.99 g of polyacrylonitrile (PAN) was added to 9 g of N-methylpyrrolidone (NMP) solution, and stirred in a stirrer at a speed of 1000 rpm for 30 min. After the PAN is completely dissolved, add 0.01 g of acetylene black and continue to stir at 800 rpm for 100 min to prepare a uniform reaction buffer layer slurry. Next, the slurry was coated on the surface of the negative electrode active layer with a 50 μm doctor blade, and then baked in a drying oven at 55° C. for 24 h. It was made into a pole piece with a diameter of 14 mm, and placed in a vacuum oven at 120° C. for 6 hours.

[0093] Then, in a specific environment such as a glove box, assemble a ...

example 3-30

[0100]Examples 3-30 are examples of reaction buffer layers used with negative active materials according to some embodiments of the present invention. As previously mentioned, the reaction buffer layer includes a polymer and an electron conductor, and the electron conductor described herein encompasses mixed electron-ion conductors.

[0101] The polymer included in the reaction buffer layer can be selected from the following: polymer 1, polyvinylidene chloride (PVDF); polymer 2, polyvinylidene chloride-hexafluoropropylene (PVDF-HFP); polymer 3, polytetrafluoroethylene Polymer 4, polyethylene oxide; Polymer 5, polyester; Polymer 6, polyamide; Polymer 7, polymethyl methacrylate; Polymer 8, polycarbonate; Polymer 9 , carboxymethylcellulose; polymer 10, styrene-butadiene copolymer; polymer 11, polyacrylonitrile; polymer 12, sodium carboxymethylcellulose, polymer 13, sodium carboxymethylcellulose: Styrene-butadiene rubber = 1:1; polymer 14, polyacrylic acid; polymer 15, lithium po...

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Abstract

The invention relates to a pre-lithiation negative electrode, a secondary battery comprising the same and manufacturing methods thereof. The manufacturing method of the pre-lithiation negative electrode for the secondary battery comprises the steps of sequentially forming a first negative active layer and a first reaction buffer layer on a first surface of a current collector, and arranging a first lithium-containing metal layer on the first reaction buffer layer to obtain a quasi-negative electrode structure; and immersing the quasi-negative electrode structure in an electrolyte so that electrochemical reaction is generated between the first lithium-containing metal layer and the first negative active layer and lithium in the first lithium-containing metal layer is embedded into the firstnegative active layer to form the pre-lithiation negative electrode.

Description

technical field [0001] The present invention generally relates to the field of new energy, and more particularly, relates to a pre-lithiated negative electrode for a secondary battery, a method for manufacturing the pre-lithiated negative electrode, a secondary battery including the pre-lithiated negative electrode, and the manufacture of the pre-lithiated negative electrode. method for secondary batteries. Background technique [0002] In recent years, the rapidly developing electric vehicle and energy storage industries have put forward higher requirements for the energy density, cost, cycle and safety of secondary batteries represented by lithium-ion batteries and sodium-ion batteries. Taking lithium-ion batteries as an example, conventional lithium-ion batteries mainly use graphite anodes, and the theoretical capacity of graphite anodes is 372mAh / g. At present, major domestic graphite anode manufacturers such as Jiangxi Zichen and Shenzhen Bestray have achieved 365mAh / g ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 黄杰王怡陆浩刘柏男李文俊李泓陈立泉
Owner BEIJING WELION NEW ENERGY TECH CO LTD