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Lithium-ion secondary battery and manufacturing method thereof

A secondary battery and manufacturing method technology, applied in secondary battery, electrolyte storage battery manufacturing, final product manufacturing, etc., can solve the problem of not being able to make full use of supplementary lithium, etc., and achieve the goal of reducing irreversible capacity, improving cycle characteristics, and high reversible capacity Effect

Inactive Publication Date: 2011-05-11
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a lithium ion secondary battery with high reversible capacity in order to solve the technical problem that the conventional way of adding lithium in the lithium ion secondary battery cannot fully utilize the supplementary lithium

Method used

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  • Lithium-ion secondary battery and manufacturing method thereof
  • Lithium-ion secondary battery and manufacturing method thereof
  • Lithium-ion secondary battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This example intends to describe in detail the lithium-ion secondary battery disclosed by the present invention, including a pole core, an electrolyte, and a metal casing, and the pole core and the electrolyte are accommodated in the metal casing;

[0032] The pole core includes a positive electrode sheet, a negative electrode sheet, and a separator between the positive electrode sheet and the negative electrode sheet; the positive electrode sheet includes a positive electrode collector and a positive electrode slurry coated on the positive electrode collector, and the negative electrode sheet includes a negative electrode collector and is coated on the negative electrode. Negative electrode slurry on the current collector;

[0033] Among them, a composite lithium sheet is also included, and the composite lithium sheet is arranged in the metal shell;

[0034] Such as Figure 7 As shown, the composite lithium sheet 5 includes a metal matrix layer 50 and a lithium coatin...

Embodiment 2

[0063] This example is intended to explain its manufacturing method.

[0064] A method for manufacturing a lithium-ion secondary battery, comprising the steps of:

[0065] Preparation of pole core: Coating the positive electrode slurry on the positive electrode current collector to make the positive electrode sheet, coating the negative electrode slurry on the negative electrode current collector to make the negative electrode sheet, and then setting a separator between the positive electrode sheet and the negative electrode sheet to make the electrode core ;

[0066] Encapsulation: Put the pole core into the metal case, and then inject electrolyte into it;

[0067] In addition, the following steps are also included:

[0068] Making a composite lithium sheet: forming a lithium-coated layer on a metal matrix layer to obtain a composite lithium sheet;

[0069] Welding: welding the metal matrix layer of the lithium composite sheet to the positive electrode current collector or...

Embodiment 3

[0077] 1) Form a uniform slurry with an appropriate amount of positive electrode active materials lithium cobaltate, PVDF, NMP and conductive carbon black, and evenly coat it on the surface of aluminum foil (0.018mm), dry and press it and cut it into a length of 534*width and 43.5*thickness 0.130mm positive plate;

[0078] 2) Fully mix an appropriate amount of negative electrode active material graphite, SBR, conductive carbon black and deionized water to make a slurry, evenly coat the surface of copper foil (0.010mm), dry and press and cut into 554*width 44.5 *Thickness 0.110mm pole piece; reserve 3~5mm at the end of the pole piece without material, which is the welding area with the composite lithium piece;

[0079] 3) Select the positive electrode sheet of the same weight, separate the positive and negative electrodes with a PP separator, and wind them into a pole core;

[0080]4) The composite lithium sheet is coated with lithium on one side. The thickness of the copper f...

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Abstract

The invention provides a lithium-ion secondary battery with high reversible capacity and a manufacturing method thereof. The battery comprises a pole core, electrolyte and a metal shell, wherein the pole core and the electrolyte are accommodated in the metal shell; the pole core comprises a positive plate, a negative plate and a diaphragm positioned between the positive plate and the negative plate; the positive plate comprises a positive current collector and positive slurry coated on the positive current collector, and the negative plate comprises a negative current collector and negative slurry coated on the negative current collector; the battery also comprises a composite lithium plate, wherein the composite lithium plate is arranged in the metal shell; and the composite lithium plate comprises a metal matrix layer and a lithium coverage layer, the metal matrix layer is not dissolved in the electrolyte and does not undergo electrochemical reaction with the electrolyte, and the metal matrix layer is welded on the inner surface of the positive current collector or the negative current collector or the metal shell. Lithium ions consumed for forming a solid electrolyte interface (SEI) film can be effectively supplemented, and the utilization rate of lithium materials can be improved. The reversible capacity of the lithium ion battery can be improved, the irreversible capacity of the battery can be reduced, and the high reversible capacity of the battery can be kept.

Description

technical field [0001] The invention belongs to the field of batteries, in particular to the field of lithium ion secondary batteries. Background technique [0002] Due to its high working voltage, high specific energy, no memory effect, no pollution, small self-discharge, and long cycle life, lithium-ion secondary batteries have gradually replaced traditional secondary batteries such as nickel separators and nickel-metal hydride, and have become It is an ideal energy source for modern mobile electronic equipment and communication equipment, such as mobile phones, notebook computers, laptop computers, personal digital assistants (PDA), cameras, digital cameras, etc. [0003] Lithium-ion secondary battery is a Li + Concentration battery, its positive and negative electrodes are lithium ion intercalation compound, when charging, Li + Extracted from the positive electrode compound, the electrolyte is embedded in the negative electrode lattice, the negative electrode is in a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058
CPCY02E60/10Y02P70/50
Inventor 颜海鹏
Owner BYD CO LTD
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