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High-safety power lithium ion battery adopting anode sheet mixing lithium titanate with graphite

A technology of lithium titanate and negative electrode sheet, which is applied to lithium ion battery and its preparation of lithium titanate mixed with graphite negative electrode sheet, and in the field of power lithium ion battery, which can solve the problem of poor electrolyte infiltration effect, affecting battery power performance, and reducing battery life. Solve problems such as core power performance, achieve excellent thermal stability, increase resistance, and improve safety

Inactive Publication Date: 2017-01-04
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, whether the surface of the pole piece is coated with alumina or lithium titanate, there are factors such as complex preparation process and uneven surface coating thickness, which cause poor surface coating effect and even affect the power performance of the battery.
In particular, the aluminum oxide surface coating also has poor electrolyte wetting effect, which will significantly reduce the power performance of the battery cell.

Method used

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  • High-safety power lithium ion battery adopting anode sheet mixing lithium titanate with graphite
  • High-safety power lithium ion battery adopting anode sheet mixing lithium titanate with graphite
  • High-safety power lithium ion battery adopting anode sheet mixing lithium titanate with graphite

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Embodiment 1

[0029] A preparation method of a lithium ion battery with lithium titanate mixed with graphite negative plate, comprising the steps of:

[0030] (1) Preparation of positive electrode slurry: LiNi with 98.25% mass ratio 1 / 3 mn 1 / 3 co 1 / 3 o 2 The positive electrode active material, the carbon nanotube (CNT) conductive agent of 0.6% by mass ratio, and the polyvinylidene fluoride (PVDF) of 1.15% by mass ratio are added in N-methylpyrrolidone (NMP) respectively, under the rotating speed 2000r / min Stir to mix evenly to form positive electrode slurry.

[0031] (2) Preparation of negative electrode slurry: the artificial graphite of 9.25% mass ratio, the natural graphite of 83.25% mass ratio, the primary particle lithium titanate of 3% mass ratio, the conductive carbon black of 1% mass ratio, the conductive carbon black of 1.5% mass ratio Carboxymethyl cellulose (CMC) and 2.0% by mass ratio of styrene-butadiene rubber (SBR) were respectively added to the negative electrode solvent...

Embodiment 2

[0047] A preparation method of a lithium ion battery with lithium titanate mixed with graphite negative plate, comprising the steps of:

[0048] (1) Preparation of positive electrode slurry: LiNi with 98.2% mass ratio 0.5 mn 0.3 co 0.2 o 2 The positive electrode active material, the carbon nanotube (CNT) conductive agent of 0.8% by mass ratio, and the polyvinylidene fluoride (PVDF) of 1% by mass ratio are added in N-methylpyrrolidone (NMP) respectively, under the rotating speed 2500r / min Stir to mix evenly to form positive electrode slurry.

[0049] (2) Preparation of negative electrode slurry: artificial graphite of 9.0% mass ratio, natural graphite of 83.5% mass ratio, secondary particle lithium titanate of 3% mass ratio, conductive carbon black of 1% mass ratio, 1.5% mass ratio Carboxymethyl cellulose (CMC) and 2.0% styrene-butadiene rubber (SBR) with a mass ratio of 2.0% were respectively added to the negative electrode solvent deionized water, stirred and mixed evenly...

Embodiment 3

[0056] A preparation method of a lithium ion battery with lithium titanate mixed with graphite negative plate, comprising the steps of:

[0057] (1) Preparation of positive electrode slurry: LiNi with 98.2% mass ratio 0.8 mn 0.1 co 0.1 o 2 Positive active material, conductive carbon black and carbon nanotube (CNT) of 0.8% by mass ratio, polyvinylidene fluoride (PVDF) of 1% by mass ratio join in N-methylpyrrolidone (NMP) respectively, at rotating speed 3000r / Stir under min and mix evenly to form positive electrode slurry;

[0058] (2) Preparation of negative electrode slurry: the primary particle lithium titanate of 9.05% mass ratio of artificial graphite, 81.45% mass ratio of natural graphite, 5% mass ratio of lithium titanate, 1% mass ratio of conductive carbon black, 1.5% mass ratio of Carboxymethyl cellulose (CMC) and 2.0% mass ratio of styrene-butadiene rubber (SBR) were added to the negative electrode solvent deionized water respectively, stirred and mixed evenly at ...

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Abstract

The invention provides a high-safety power lithium ion battery adopting an anode sheet mixing lithium titanate with graphite. The high-safety power lithium ion battery is characterized in that an anode material is included, the anode material is prepared from an anode active material, an anode conducting agent and an anode bonding agent, and the graphite, lithium titanate, the anode conducting agent, the anode bonding agent and an anode solvent are uniformly dispersed and mixed to form anode slurry, wherein the mass ratio of lithium titanate to the anode active material ranges from 0.5% to 10%. According to the high-safety power lithium ion battery, when the battery has a partial short-circuit fault, the heat stability of the lithium ion battery anode sheet adopting anodes mixing lithium titanate with the graphite is high, lithium titanate particles in the anode sheet are instantaneously subjected to lithium removal to form an empty-electricity-state insulator, the resistance of the anode sheet is increased, the short-circuit current is significantly decreased, and the safety of the battery is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and relates to power lithium-ion batteries, and more specifically, to a lithium-ion battery using lithium titanate mixed with graphite negative plates and a preparation method thereof. Background technique [0002] The power performance, cycle performance and safety performance of power lithium-ion batteries have always been the focus of product development. Therefore, how to further optimize the safety performance of the power battery on the basis of ensuring the power performance of the battery has always been a difficult problem. In the existing technology, in order to improve the safety performance of the battery, a layer of alumina nano-ceramic layer or lithium titanate layer is coated on the surface of the positive and negative electrodes to increase the surface resistance of the electrode sheet and improve the thermal stability of the electrode sheet. Therefore, it plays the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/583H01M4/62H01M10/42H01M10/0525
CPCH01M4/485H01M4/583H01M4/625H01M10/0525H01M10/4235Y02E60/10
Inventor 王聪于悦刘桂玲叶逢贵冯树南从长杰王驰伟
Owner TIANJIN ENERGIES
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