Preparation method for nano titanium dioxide lithium ion battery cathode material

A nano-titanium dioxide and lithium-ion battery technology, applied in the direction of titanium dioxide, battery electrodes, titanium oxide/hydroxide, etc., can solve problems such as long reaction cycle, difficult control of hydrolysis speed, complex reaction mechanism, etc.

Active Publication Date: 2012-08-08
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of this method is more complicated
TiO obtained by ordinary hydrolysis 2 The hydrolysis rate is difficult to control, resulting in TiO 2 Particle size is difficult to achieve high rate TiO 2 performance requirements
Preparation of TiO by template method and hydrothermal method 2 The reaction mechanism is complex and the reaction cycle is too long, resulting in high cost and difficult industrial production

Method used

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  • Preparation method for nano titanium dioxide lithium ion battery cathode material
  • Preparation method for nano titanium dioxide lithium ion battery cathode material
  • Preparation method for nano titanium dioxide lithium ion battery cathode material

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preparation example Construction

[0030] The invention provides a preparation method of nano-titanium dioxide lithium ion battery negative electrode material, comprising:

[0031] a) dissolving the titanium source compound in a mixed solution of acetic acid and ethanol; obtaining a first reaction solution;

[0032] b) mixing and dissolving oxalic acid in ethanol to obtain a second reaction solution;

[0033] c) mixing the first reaction solution with the second reaction solution, reacting oxalic acid with a titanium source compound to generate a precipitate;

[0034] d) roasting the precipitate obtained in the step c) to obtain the nano-titanium dioxide lithium ion battery negative electrode material.

[0035] Nano-titanium dioxide is a material that can replace carbon materials as the negative electrode of lithium-ion batteries. Since nano-titanium dioxide is prepared as a gel material, it needs to be dried when preparing the negative electrode material, and the drying time is long, which affects the use of ...

Embodiment 1

[0047] This example is used to illustrate the preparation of the silicon / carbon composite negative electrode material for lithium ion batteries provided by the present invention.

[0048] (1) Dissolve 5 mL of glacial acetic acid in 500 mL of ethanol solution, then add 6 mL of tetrabutyl titanate dropwise, and stir evenly to prepare a solution.

[0049] Add 1.89g of oxalic acid into a mixed solution of 30mL of water and 30mL of ethanol, and stir to prepare solution b.

[0050] (2) Put the solution b in a water bath at 50°C, and add the solution a dropwise, and stir for 3 hours. Aging at room temperature.

[0051] (3) Wash the obtained precipitate with ethanol and water respectively, and sinter at 400°C for 4h.

[0052] The obtained product has a lithium intercalation capacity of 257mAh / g for the first time, and a lithium delithiation capacity of 213mAh / g for the first time. See attached figure 1 .

Embodiment 2

[0054] (1) Dissolve 0.2mL of glacial acetic acid into 18mL of ethanol solution, then add 5mL of tetrabutyl titanate dropwise, and stir evenly to prepare a solution.

[0055] Add 2.4g of oxalic acid and 0.6g of sodium dodecylbenzenesulfonate to a mixed solution of 30mL of water and 30mL of ethanol, and stir to prepare solution b.

[0056] (2) Put the solution b in a water bath at 70°C, and add the solution a dropwise, and stir for 5 hours. Aging at room temperature.

[0057] (3) Wash the obtained precipitate with ethanol and water respectively, and sinter at 450°C for 4h.

[0058] The morphology of the obtained product is shown in the appendix figure 2 . After 100 cycles at 1C, the capacity basically does not decay. See attached image 3 .

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Abstract

The invention provides a preparation method for a nano titanium dioxide lithium ion battery cathode material. The preparation method comprises the following steps of: (a) dissolving a titanium source compound into a mixed solution of acetic acid and ethanol to obtain a first reaction solution; (b) dissolving oxalic acid mixed solution into ethanol to obtain a second reaction solution; (c) mixing the first reaction solution with the second reaction solution and reacting the oxalic acid with the titanium source compound to generate precipitation; and (d) roasting the precipitation obtained in the step (c) to obtain the lithium ion battery cathode material. The preparation method provided by the invention is short in preparation time and is simple and convenient in operation; and the prepared cathode material is uniform in particle size, high in capacity and high in multiplying power characteristic.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for preparing a negative electrode material of nano-titanium dioxide lithium-ion batteries. Background technique [0002] At present, the mainstream anode materials are generally carbon materials. Carbon materials have a wide range of sources, simple synthesis processes, and are non-toxic. Compared with metal lithium, carbon materials have greatly improved in terms of safety performance and cycle performance. However, there are still many disadvantages. For example, when charging and discharging for the first time, a solid electrolyte interface (SEI) film will be formed on the surface of the negative electrode, resulting in a large irreversible capacity loss for the first time. The electrode potential of carbon is close to that of metal lithium. When the battery is overcharged, metal lithium may still be precipitated on the surface of the carbon electrode,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053H01M4/48B82Y30/00B82Y40/00
CPCY02E60/12Y02E60/10
Inventor 刘兆平辛星周旭峰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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