Preparation method of lithium titanate material, lithium titanate material, and lithium ion battery

A lithium titanate and lithium source technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor rate discharge performance

Inactive Publication Date: 2015-05-13
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the technical problem of poor rate discharge performance of lithium titanate materials in the prior art, the present invention provides a preparation method of lithium titanate materials, and the lithium titanate materials prepared by this method have excellent rate discharge performance

Method used

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  • Preparation method of lithium titanate material, lithium titanate material, and lithium ion battery

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preparation example Construction

[0011] The preparation method of the lithium titanate material disclosed in the present invention comprises the steps of preliminary ball milling the mixture containing the lithium source and the nickel source, and then performing preliminary calcination to obtain a precursor; then mixing the precursor with the titanium source and performing secondary ball milling, and then Secondary calcination is carried out in an inert atmosphere or a reducing atmosphere to obtain the lithium titanate material.

[0012] According to the present invention, the lithium source adopted in the above method can adopt various lithium salts in the prior art, for example, the lithium source can be selected from lithium hydroxide, lithium acetate, lithium carbonate, lithium chloride, lithium chromate, One or more of lithium citrate, lithium tetrachloroaluminate, lithium bromide, lithium tetrafluoroborate or lithium oxalate.

[0013] As a doping element, the nickel source disclosed in the present inve...

Embodiment 1

[0043] This embodiment is used to illustrate the lithium titanate material disclosed in the present invention, its preparation method and lithium ion battery.

[0044] Preparation of lithium titanate material: 0.8 mol of lithium carbonate was mixed with 0.0008 mol of nickel oxide to obtain a mixture. The mixture was then ball milled in a ball mill for 5 h, and then preliminarily calcined at 600 °C for 5 h. get the precursor. The precursor was mixed with 1 mol of titanium oxide and milled twice in a ball mill for 5 h. The product of the secondary ball milling was then calcined at 600° C. for 24 hours in a nitrogen atmosphere to obtain the lithium titanate material A1.

[0045] Preparation of non-aqueous electrolyte: Mix ethylene carbonate (EC), ethyl methyl carbonate (EMC), and dimethyl carbonate (DMC) in a volume ratio of 3:3:2, and add lithium salt LiPF 6 , with a concentration of 1 mol / l, and stirred evenly to obtain an electrolyte solution.

[0046] Preparation of negat...

Embodiment 2

[0050] This embodiment is used to illustrate the lithium titanate material disclosed in the present invention, its preparation method and lithium ion battery.

[0051] 0.81 mol of lithium chloride was mixed with 0.0405 mol of nickel carbonate to obtain a mixture. The mixture was then ball milled in a ball mill for 6 h, and then preliminarily calcined at 650 °C for 6 h. get the precursor. The precursor was mixed with 1 mol of titanium oxide and milled twice in a ball mill for 6 h. The product of the secondary ball milling was then calcined for a second time at 750° C. for 12 hours in a nitrogen atmosphere to obtain the lithium titanate material A2.

[0052] The lithium-ion battery S2 was prepared by using the above-mentioned lithium titanate material A2 according to the method of Example 1.

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Abstract

The invention provides a preparation method of a lithium titanate material, the lithium titanate material, and a lithium ion battery. The preparation method comprises the steps that: a mixture containing a lithium source and a nickel source is subjected to primary ball milling; the mixture is calcined, such that a precursor is obtained; the precursor is mixed with a titanium source, and the mixture is subjected to secondary ball milling; and the mixture is calcined in an inert or reductive atmosphere, such that the lithium titanate material is obtained. With the method, the prepared lithium titanate material has excellent rate discharge performance, and is especially suitable to be applied in fields such as power batteries which require high-rate charging and discharging.

Description

technical field [0001] The invention relates to a preparation method of a lithium titanate material, the lithium titanate material and a lithium ion battery using the lithium titanate material. Background technique [0002] Lithium-ion batteries have the advantages of high energy density (150-200Wh / kg), high working voltage, low self-discharge, long life, no memory effect and environmental friendliness, and have been widely used in mobile communications, notebook computers, video cameras, cameras, portable Instrumentation and other fields are also the preferred supporting power sources for electric vehicles and space power sources that have been vigorously researched by various countries, and have become the first choice for alternative energy sources. [0003] Advanced electrode materials have become the core technology for the replacement of lithium-ion batteries. The existing commercial negative electrode active materials are generally carbon materials, and carbon materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/485H01M10/0525
CPCY02E60/10
Inventor 许静
Owner BYD CO LTD
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