Lithium titanate electrode plate and lithium ion battery

A technology of lithium titanate and electrode sheet is applied in the field of lithium titanate electrode sheet and lithium ion battery to achieve the effect of improving cycle performance and preventing battery bulging

Active Publication Date: 2014-04-30
SPRINGPOWER TECHNOLOGY (SHENZHEN) CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a lithium titanate electrode sheet to solve the gas problem of the lithium titanate battery and improve its cycle performance

Method used

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  • Lithium titanate electrode plate and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Preparation of lithium titanate electrode sheet and lithium ion battery

[0075] 1. Take 100g of polyvinylidene fluoride binder, 20g of acetylene black conductive agent and 2kg of lithium titanate, and evenly disperse them in 2kg of N-methylpyrrolidone, stir and disperse at a high speed of 3000r / min, and stir evenly to obtain lithium titanate coating slurry;

[0076] 2. Coat the lithium titanate coating slurry on the copper foil and dry it at 90°C to form a lithium titanate coating on the copper foil. The thickness of the lithium titanate coating is 150 microns;

[0077] 3. Take 10g of polyvinylidene fluoride binder, 15g of acetylene black conductive agent and 200g of artificial graphite with an average particle size of 500nm, and uniformly disperse them in 200g of N-methylpyrrolidone, stir and disperse at a high speed of 3000r / min, stir Uniformly obtain carbon coating slurry;

[0078] 4. Coat the carbon coating slurry on the lithium titanate coating, dry it at 90°C, ...

Embodiment 2

[0081] Preparation of lithium titanate electrode sheet and lithium ion battery

[0082] 1. Take 60g of polyvinylidene fluoride binder, 30g of acetylene black conductive agent and 2kg of lithium titanate, and evenly disperse them in 2.5kg of N-methylpyrrolidone, stir and disperse at a high speed of 4000r / min, and stir evenly to obtain titanic acid Lithium coating paste;

[0083] 2. Coat the lithium titanate coating slurry on the copper foil and dry it at 95°C to form a lithium titanate coating on the copper foil. The thickness of the lithium titanate coating is 80 microns;

[0084] 3. Take 15g of polyvinylidene fluoride binder, 15g of acetylene black conductive agent and 200g of artificial graphite with an average particle size of 800nm, and evenly disperse them in 220g of N-methylpyrrolidone, and stir and disperse at a high speed of 3500r / min. Stir evenly to obtain carbon coating slurry;

[0085] 4. Coat the carbon coating slurry on the lithium titanate coating, dry it at 10...

Embodiment 3

[0088] Preparation of lithium titanate electrode sheet and lithium ion battery

[0089] 1. Take 10g of polyvinylidene fluoride binder, 10g of acetylene black conductive agent and 0.98kg of lithium titanate, and evenly disperse them in 2.3kg of N-methylpyrrolidone, stir and disperse at a high speed of 3000r / min, and stir evenly to obtain titanium Lithium acid coating slurry;

[0090] 2. Coat the lithium titanate coating slurry on the copper foil and dry it at 105°C to form a lithium titanate coating on the copper foil. The thickness of the lithium titanate coating is 60 microns;

[0091] 3. Take 5g of polyvinylidene fluoride binder, 9g of acetylene black conductive agent and 190g of soft carbon with an average particle size of 1 micron, and evenly disperse them in 250g of N-methylpyrrolidone, and stir and disperse at a high speed of 5000r / min. Stir evenly to obtain carbon coating slurry;

[0092] 4. Coat the carbon coating slurry on the lithium titanate coating, dry it at 110...

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Abstract

The invention relates to a lithium titanate electrode plate and a lithium ion battery. The lithium titanate electrode plate comprises a current collector, a lithium titanate coating and a carbon coating, wherein the lithium titanate coating is stacked on the current collector, the carbon coating is stacked on the lithium titanate coating, and materials of the carbon coating include carbon materials, first binders and a first conductive agent. The electrolyte in the lithium ion battery reacts with the carbon coating under lower potential to form an SEI (solid electrolyte interface) film to separate active substances in the lithium titanate coating from the electrolyte, thus preventing battery ballooning caused by reaction between the active substances and the electrolyte due to overpotential; moreover, the carbon coating has certain lithium intercalation capacity, thus the transport of lithium ions is not affected; therefore, the lithium ion battery using the lithium titanate electrode plate has good cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium titanate electrode sheet and a lithium ion battery. Background technique [0002] A lithium-ion battery is a rechargeable battery that primarily relies on the movement of lithium ions between the positive and negative electrodes to function. Due to the advantages of high operating voltage, high specific energy, wide operating temperature range, and stable discharge, lithium-ion batteries are widely used in mobile communication equipment, tablet computers, digital products, power tools, automobiles, and energy storage systems. [0003] Lithium titanate is a material with a spinel structure. Because the volume change is very small, almost zero, during the charging and discharging process of lithium ion insertion and extraction, it is called a "zero strain" material, and it has a very stable discharge platform. , its potential to lithium is close to 1.55V, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0525
CPCY02E60/122H01M4/131H01M4/625H01M10/0525Y02E60/10
Inventor 李小兵李文良
Owner SPRINGPOWER TECHNOLOGY (SHENZHEN) CO LTD
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