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Lithium-ion secondary battery and lithium-rich negative electrode sheet thereof

A secondary battery and negative electrode technology, applied in secondary batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve the problems of low production efficiency, large environmental pollution, and inability to overcome lithium metal powder flying, etc., to achieve production efficiency High, low investment cost, easy transfer effect

Active Publication Date: 2018-07-13
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is simple and feasible, there are huge potential safety hazards in the operation process, and the problem of flying lithium metal powder cannot be overcome, resulting in large environmental pollution and low production efficiency.

Method used

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  • Lithium-ion secondary battery and lithium-rich negative electrode sheet thereof
  • Lithium-ion secondary battery and lithium-rich negative electrode sheet thereof
  • Lithium-ion secondary battery and lithium-rich negative electrode sheet thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. Preparation of Initial Negative Electrode for Lithium-ion Secondary Batteries

[0046] The negative electrode active material graphite and SiO x (0x (02 / g) mixed with solvent N-methylpyrrolidone (NMP) at a mass ratio of 92:3:5 to make negative electrode slurry, and then according to 121mg / 1540mm 2 The coating weight of the negative electrode slurry is evenly coated on the positive and negative sides of the porous current collector copper foil, and then dried at 85°C to form a negative electrode membrane, and the water content of the negative electrode membrane is not more than 300ppm, and then cooled Pressing, trimming, cutting, slitting, and welding the negative electrode lug to obtain the initial negative electrode sheet of the lithium-ion secondary battery with a width of 160 mm.

[0047] 2. Preparation of lithium-rich negative electrodes for lithium-ion secondary batteries

[0048] The dispersant polyethylene oxide (PEO, the HLB value is 14, the weight average...

Embodiment 2

[0056] Lithium-ion secondary battery was prepared according to the method of Example 1, except that in the preparation of the lithium-rich negative plate of lithium-ion secondary battery (i.e. step (2)), the non-aqueous organic solvent was propylene carbonate (PC) and dicarbonate The mixture of methyl ester (DMC) (weight ratio is 3:2), dispersant: conductive agent: lithium metal powder: the weight ratio of non-aqueous organic solvent is 0.2:0.8:30:69.

Embodiment 3

[0058] Prepare lithium ion secondary battery according to the method for embodiment 1, just in the preparation (being step (2)) of the lithium-rich negative plate of lithium ion secondary battery, non-aqueous organic solvent is propylene carbonate (PC) and ethylene carbonate The mixture of ester (EC) (weight ratio is 1:3), the weight ratio of dispersant: conductive agent: lithium metal powder: non-aqueous organic solvent is 0.6:0.1:30:69.3.

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Abstract

The invention provides a lithium ion secondary battery and a lithium-rich negative plate thereof. The lithium-rich negative plate of the lithium ion battery comprises a negative current collector and a negative active substance layer, wherein the negative active substance layer contains a negative active substance and covers the surface of the negative current collector; the surface, far away from the negative current collector, of the negative active substance layer is coated with a lithium-containing slurry layer; the lithium-containing slurry layer comprises a dispersing agent, a conductive agent, lithium metal powder and a non-aqueous organic solvent, wherein the non-aqueous organic solvent and an electrolyte solution of the lithium ion secondary battery are mutually dissolved. The lithium ion secondary battery comprises the lithium-rich negative plate. The lithium-rich negative plate provided by the invention can realize accurate, quantitative and uniform lithium enrichment, and is free of lithium metal powder pollution, so that the preparation technology is simpler, and the lithium supplementing efficiency of the lithium-rich negative plate is improved. The lithium ion secondary battery provided by the invention has higher first coulombic efficiency and rate performance, and also has lower resistance and self-discharge.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-ion secondary battery and a lithium-rich negative electrode sheet thereof. Background technique [0002] Lithium-ion secondary batteries have become one of the most widely used secondary batteries due to their advantages such as long cycle life, high voltage and high energy density. With the acceleration of the update speed of electronic products and the emergence of high-power and high-energy devices, people have put forward higher requirements for the energy density of lithium-ion secondary batteries. [0003] During the first charging and discharging process of a lithium-ion secondary battery, due to the formation of a solid electrolyte (SEI) film, some lithium ions will be consumed, resulting in a decrease in the number of effective lithium ions, thereby reducing the capacity of the lithium-ion secondary battery and causing lithium ions to The primary Coulombic e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/0525
CPCY02E60/10
Inventor 张双虎陶兴华张盛武程文强
Owner CONTEMPORARY AMPEREX TECH CO