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Lithium ion battery and positive electrode plate thereof and preparation method thereof

A technology for lithium-ion batteries and positive plates, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low potential chemical reaction activity, affecting battery performance, and electrolyte system damage

Inactive Publication Date: 2019-05-10
江西星盈科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The inventors found in the process of carrying out the research of the present invention that no matter lithium metal or lithium powder has low potential and high chemical reactivity, it is easy to burn in the air, and there is a big problem of processing safety, and it is different from the existing There are compatibility issues with solvents and binders, for example, stabilized lithium metal powder (SLMP) will react with NMP, a commonly used slurrying solvent, and cause explosion hazards
[0007] In addition, in the prior art, the battery is designed with a built-in lithium metal sheet and made into three electrodes to supplement lithium to the system, such as CN201310336418.5 and CN201310463949.0. Lithium metal is easily oxidized and burns when exposed to the air, so this This method also has a great processing safety problem, and the reactivity of lithium metal with the electrolyte is high. Since the lithium element will react with the electrolyte, it is easy to cause damage to the electrolyte system and ultimately affect the performance of the entire battery.

Method used

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  • Lithium ion battery and positive electrode plate thereof and preparation method thereof
  • Lithium ion battery and positive electrode plate thereof and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] This embodiment provides a positive electrode sheet suitable for a lithium ion battery, which mainly includes a current collector, a positive electrode active material layer coated on the current collector, and a lithium supplementary material layer.

[0108] Wherein, the substance coated on the positive electrode active material layer is a mixture of positive electrode active materials, conductive agents, binders, etc., wherein the positive electrode active materials can use one or more of the prior art, a typical but non-limiting example With: LiFePO 4 、LiCoO 2 , LiMn 2 o 4 and layered lithium composite oxide Li 1+x Ni 1-y-z m y N z o 2 One or a combination of them, wherein the layered lithium composite oxide Li 1+x N i1-y-z m y N z o 2 M and N in are respectively one or more of Co, Mn, Al, wherein -0.05<x<0.1, 0<y<2 / 3, 0<z<2 / 3, 0<y+z< 2 / 3.

[0109] The binder is polyvinylidene fluoride (PVDF).

[0110] The conductive agent is one or more of acetylene b...

experiment example 11

[0172] 1. Preparation of positive electrode sheet

[0173] 1.1 Preparation of lithium-supplementing material layer

[0174] LiF powder, Co powder, conductive carbon black (SP) and polyvinylidene fluoride (PVDF) were dispersed in N-methylpyrrolidone, and high-energy ball milled for 12 h under nitrogen atmosphere to form a slurry.

[0175] Among them, the mass ratio of LiF:Co:SP:PVDF is: 55:40:2.5:2.5;

[0176] Coat the lithium-supplementing slurry on both sides of the aluminum foil (thickness 12 μm), and then dry it at 90°C for 10 minutes to form a lithium-supplementing material layer on both sides of the aluminum foil. After drying, the coated surface density is 0.22mg / cm2

[0177] 1.2 Formation of positive electrode active material layer

[0178] Disperse lithium ferrous phosphate LiFePO4, conductive carbon black and polyvinylidene fluoride in N-methylpyrrolidone to form positive electrode active material slurry. Wherein, the weight ratio of lithium cobaltate: conductive c...

experiment example 12

[0184] Compared with Experimental Example 11, the only difference is that the mass ratio of LiF:Co:SP:PVDF in this Experimental Example 12 is: wherein, the mass ratio of LiF:Co:SP:PVDF is: 56:41: 1.5:1.5;

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Abstract

The invention relates to the field of a lithium ion battery and discloses a lithium ion battery and a positive electrode plate thereof and a preparation method thereof. The positive electrode plate comprises a current collector; a positive electrode active material layer and a lithium-supplementing material layer are coated on the current collector; a mixture of a positive electrode active material, a conductive agent and a binder is coated on the positive electrode active material layer; and a mixture of LiF, a transition metal, the conductive agent and the binder is coated on the lithium-supplementing material layer. By use of the technical scheme, the reversible gram capacity of the lithium ion battery is improved on the basis of guaranteeing the safety of production and use of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, and discloses a lithium ion battery, a positive electrode sheet and a preparation method thereof. Background technique [0002] The gradual depletion of fossil energy and the increasing severity of the greenhouse effect have prompted researchers to explore sustainable and clean energy. Since Sony first commercialized lithium-ion batteries in 1991, lithium-ion batteries have been widely used in 3C digital products. Since lithium-ion batteries have advantages over traditional lead-acid batteries in terms of cycle life, volumetric energy density, and mass energy density, many technicians have been working on the commercialization of lithium-ion batteries as power batteries in the past 20 years. [0003] The actual available energy density and cycle life of the full battery are closely related to the first coulombic efficiency of the lithium-ion battery and the formation of the negative electrod...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/131H01M4/1391H01M4/1397H01M10/0525
CPCY02E60/10
Inventor 郭永兴卢林夏占鳌周雷军
Owner 江西星盈科技有限公司
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