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Titanium niobate negative electrode material and preparation method thereof

A negative electrode material, titanium niobate technology, applied in negative electrodes, chemical instruments and methods, titanates, etc., can solve the problems of large negative electrode sheet, reduce the energy density of lithium batteries, etc., and achieve high production efficiency and excellent ion conductivity. rate, the effect of increasing the discharge capacity

Active Publication Date: 2019-10-08
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the above-mentioned modified clay has almost no deintercalation effect on lithium ions, so adding it to titanium niobate will reduce the energy density of lithium batteries. For lithium batteries with the same energy, using this modified clay to modify titanium niobate The volume of the negative electrode sheet of the lithium battery is relatively large, and there is a large volume deformation during the charge and discharge process.

Method used

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  • Titanium niobate negative electrode material and preparation method thereof
  • Titanium niobate negative electrode material and preparation method thereof
  • Titanium niobate negative electrode material and preparation method thereof

Examples

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Embodiment 1

[0044] A kind of titanium niobate negative electrode material, see figure 1, including a core structure 1 and a shell structure 2 coated on the surface of the core structure 1, the core structure 1 is mainly composed of titanium niobate, and the shell structure 2 is mainly composed of lithium titanate.

[0045] The preparation method of the above-mentioned titanium niobate negative electrode material comprises the following steps:

[0046] ①. Liquid preparation: add lithium titanate to ethanol, stir evenly to obtain a lithium titanate-ethanol solution with a lithium ion concentration of 15 mol / L.

[0047] ②, Coating: Pour the lithium titanate-ethanol solution prepared in step ① into the atomization device, and atomize it in a nitrogen environment, and at the same time, spray titanium niobate powder on the atomized lithium titanate-ethanol solution, mixed thoroughly to obtain the coating material. Wherein, the weight ratio of titanium niobate to lithium titanate is 1:0.2, and...

Embodiment 2- Embodiment 6

[0050] Embodiment 2-Example 6 are all based on the method of Example 1, and the weight ratio of titanium niobate to lithium titanate is adjusted, and the specific adjustment is shown in Table 1 below.

[0051] Table 1 The weight ratio of titanium niobate and lithium titanate in Example 1-Example 6

[0052]

Embodiment 7- Embodiment 11

[0054] Example 7-Example 11 are all based on the method of Example 1, and the particle size ratio of titanium niobate to lithium titanate is adjusted. For specific adjustments, see Table 2 below.

[0055] Table 2 The particle size ratio of titanium niobate and lithium titanate in Example 1, Example 7-Example 11

[0056]

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Abstract

The invention relates to the field of lithium ion batteries, in particular to a titanium niobate negative electrode material and preparation method thereof. The titanium niobate negative electrode material comprises a core structure and a shell structure coating the surface of the core structure, wherein the main component of the core structure is titanium niobate; and the main component of the shell structure is lithium titanate and is prepared through steps of liquid preparation, coating and drying. The titanium niobate negative electrode prepared in the invention has excellent ionic conductivity and electronic conductivity, the impedance of the negative electrode is reduced, the discharge capacity is improved, and in the lithium battery charge and discharge process, the volume deformation of a negative electrode sheet is effectively reduced.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a titanium niobate negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. Due to the advantages of high voltage, large specific energy, long cycle life, good safety performance, small self-discharge, and fast charging, lithium-ion batteries have been widely used in various electronic products. [0003] At present, the anode material of commercial lithium-ion batteries is mainly graphite. Due to the poor intercalation ability of lithium in traditional graphite anodes, it is easy to deposit lithium on the surface to form lithium dendrites, which has a great impact on the cycle performance and safety performance of the battery. Titanium niobate is a new type of negative el...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/0525C01G33/00C01G23/00
CPCH01M4/5825H01M4/624H01M4/628H01M10/0525C01G33/00C01G23/005C01P2004/80H01M2004/027Y02E60/10
Inventor 许晓雄崔言明詹盼
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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