Lithium ion battery positive electrode taking titanium black as additive, battery and preparation method

A lithium-ion battery and titanium oxide technology, applied in the field of electrochemistry, can solve problems such as dangerous process conditions and cumbersome preparation processes

Inactive Publication Date: 2021-04-23
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Utilize the high conductivity and corrosion resistance of titanium dioxide to improve the rate performance and cycle stability of lithium-ion batteries, but its preparation process is cumbersome and the process conditions are dangerous

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The preparation method of the positive electrode is as follows: the active material is mixed with the titanium oxide additive compound, the conductive agent, and the binder at a mass ratio of (16-18):(1-2):(1-2). Adding an organic solvent and stirring evenly to obtain a slurry, uniformly coating the slurry on the aluminum current collector, the thickness of the slurry coated on the positive electrode sheet is 100-400 μm, and vacuum drying at 110°C for 12 hours to obtain the positive electrode sheet; , the added amount of the added organic solvent is 10 to 30 times the mass of the added active material.

[0024] The titanium oxide complex is prepared by the following process: ultrasonically disperse the active material and titanium oxide in ethanol, and separate the titanium oxide complex by centrifugation; or directly mix the titanium oxide and the active material in a certain proportion, and grind them evenly by hand , to obtain titanium oxide composites. The mass fra...

Embodiment 1

[0035] A lithium-ion battery using titanium dioxide as a positive electrode additive includes a positive electrode containing a titanium dioxide additive, a separator, an electrolyte, and a metal lithium negative electrode.

[0036] Preparation of composites containing titanium oxide additives: titanium oxide and positive electrode active material LiCoO 2 Mix according to the mass ratio of 16:1, ultrasonically disperse in ethanol for 2 hours, and separate the composite precipitate by centrifugation; vacuum-dry the titanium oxide composite at 110°C for 12 hours to obtain titanium oxide and LiCoO 2 compound.

[0037] Preparation of positive electrode containing TiO additive: combining TiO with LiCoO 2 The compound, acetylene black conductive agent, and binder (PVDF) are mixed at a mass ratio of 17:1:2. During the mixing process, the organic solvent N-methylpyrrolidone is added, and the slurry is obtained by stirring for 1 hour; then an adjustable scraper is used Evenly coat th...

Embodiment 2

[0041] A lithium-ion battery using titanium dioxide as a positive electrode additive includes a positive electrode containing a titanium dioxide additive, a separator, an electrolyte, and a metal lithium negative electrode.

[0042] Preparation of positive electrode containing titanium oxide additive: the positive active material LiFePO 4 , titanium oxide, acetylene black conductive agent, and binder (PVDF) are mixed at a mass ratio of 16:1:1:2, and the organic solvent N-methylpyrrolidone is added during the mixing process, and the slurry is obtained by stirring for 1 hour; then use The adjustable scraper evenly coated the slurry on the aluminum foil current collector; dried the current collector in a vacuum oven at 60°C for 24 hours, and cut it into small discs with a diameter of 1.2 cm using a tablet machine to obtain the Positive electrode sheet with titanium oxide additive.

[0043] Battery assembly: In a glove box filled with argon gas, from bottom to top, the positive e...

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Abstract

The invention relates to a lithium ion battery positive electrode taking titanium black as an additive, a battery and a preparation method. The lithium ion battery positive electrode comprises a positive plate, and the positive plate is prepared by the following steps of: mixing a compound of an active substance and titanium black, a conductive agent and a binder according to a mass ratio of (16-18): (1-2): (1-2), then adding an organic solvent and uniformly mixing to obtain slurry, applying the slurry to an aluminum current collector, and drying to obtain the lithium ion battery positive electrode taking titanium black as an additive. The conductivity of the electrode is improved by adding the titanium black additive, the titanium black and the electrode active material oxide have compatibility, and the coulombic efficiency of the battery is improved through the synergistic effect. From the perspective of simplicity and suitability for industrialization, the invention provides a low-cost and easy-to-operate lithium ion battery positive electrode taking titanium black as an additive, a battery and a preparation method.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a positive electrode of a lithium ion battery using titanium dioxide as an additive, a battery and a preparation method. Background technique [0002] As the global energy shortage continues to intensify, the development and utilization of new energy technologies is imminent, thus promoting the rapid development of the electrochemical energy storage industry. Since the introduction of lithium-ion batteries by Sony in the 1990s, lithium-ion batteries have been widely recognized for their advantages of high voltage and high energy density. gradually established a dominant position in China, and has completely occupied the entire consumer electronics market today. [0003] The positive electrode is the most important part of lithium-ion batteries, mainly composed of active materials, conductive agents and binders. The most commonly used positive electrode activ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/04H01M10/0525H01M10/058
CPCH01M4/62H01M4/624H01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/0404H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 李明涛龙志易义坤
Owner XI AN JIAOTONG UNIV
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