Negative electrode material of lithium ion battery and preparation method of negative electrode material, and lithium ion battery

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reducing the tap density of lithium titanate materials, difficult to ensure the uniformity of carbon-based materials, and complex nanostructure design process. , to achieve the effect of low price, good uniformity and low equipment requirements

Pending Publication Date: 2017-12-19
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But these two methods have obvious disadvantages: the introduction of carbon-based materials and heteroatoms will use time-consuming hydrothermal reaction or dangerous vapor deposition, and it is difficult to ensure the uniformity of carbon-based materials coating, while heteroatom doping generally It is time-consuming, and the doping efficiency is low; the design process of the nanostructure is complicated, the cost is high, and the tap density of the lithium titanate material will be reduced, so it is only suitable for small-scale production
Although this scheme can synthesize lithium titanate at a lower temperature, it cannot further improve the quality of lithium carbonate
The Chinese patent application number 201510971408.8 titled "A Preparation Method of High-performance Co-doped Lithium Titanate Electrode Material" provides a precursor that also uses lithium source, titanium dioxide and doped metal ions by calcination, The method of solid-phase mixing is used to make doped lithium titanate electrode materials, but this method still cannot overcome the problems of lack of uniformity and low efficiency in the coating and doping process

Method used

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  • Negative electrode material of lithium ion battery and preparation method of negative electrode material, and lithium ion battery
  • Negative electrode material of lithium ion battery and preparation method of negative electrode material, and lithium ion battery
  • Negative electrode material of lithium ion battery and preparation method of negative electrode material, and lithium ion battery

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Embodiment 1

[0031] Get the lithium source as lithium carbonate, the addition ratio of lithium source, melamine and tetrabutyl titanate is:

[0032] Li:melamine=1:62.5, Li:Ti=4.02:5.

[0033] In the reactant addition, since the nitrogen-doped lithium titanate will be prepared, the melamine as the nitrogen source must be excessive, if the addition is too little, it will be difficult to carry out sufficient nitrogen doping, if the addition is too much, the raw materials will be wasted, and the The process leading to subsequent processing is time consuming. According to the molecular formula Li4Ti5O12 of lithium titanate, the addition amount of tetrabutyl titanate needs to be calculated based on the Ti content in the molecule, and the molar ratio of the Li content in the lithium source is 5:4. However, in the actual preparation process , considering that there is a certain burning loss of Li element during the calcination process, when adding raw materials, the lithium source content is slig...

Embodiment 2

[0037] Get the lithium source as lithium carbonate, the addition ratio of lithium source, melamine and tetrabutyl titanate is:

[0038] Li:melamine=1:32.5, Li:Ti=4.01:5.

[0039] The preparation method of negative electrode material is:

[0040] Put melamine and lithium carbonate into a ball mill jar, add a small amount of ethanol, and ball mill at a speed of 10000r / min for 30min. After the ethanol is completely volatilized, add tetrabutyl titanate, stir until the mixture becomes a uniform gel, and then add distilled water dropwise while stirring the above gel mixture, until all the gel forms a powder again. Put the powder obtained above into a rectangular corundum crucible and place it in the center of a programmable tube furnace, raise the temperature to 300°C at 5°C / min, and keep it for 1 hour; then raise the temperature to 500°C at 5°C / min, and keep it for 2 Hours, then heated up to 800°C at 3°C / min, held for 4 hours, and cooled naturally to obtain a yellow or gray nitro...

Embodiment 3

[0042] Get the lithium source as lithium carbonate, the addition ratio of lithium source, melamine and tetrabutyl titanate is:

[0043] Li:melamine=1:62.5, Li:Ti=4.01:5.

[0044] The preparation method of negative electrode material is:

[0045] Put melamine and lithium carbonate into a ball mill jar, add a small amount of ethanol, and ball mill at a speed of 10000r / min for 30min. After the ethanol is completely volatilized, add tetrabutyl titanate, stir until the mixture becomes a uniform gel, and then add distilled water dropwise while stirring the above gel mixture, until all the gel forms a powder again. Put the powder obtained above into a cuboid corundum crucible and place it in the center of a programmable tube furnace, raise the temperature to 300°C at 5°C / min, and keep it for 1 hour; then raise the temperature to 580°C at 5°C / min, and keep it for 2 After 2 hours, the temperature was raised to 800° C. at 2° C. / min, kept for 2 hours, and after natural cooling, a yello...

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Abstract

The invention discloses a negative electrode material of a lithium ion battery. The negative electrode material is nitrogen-doped carbon-modified lithium titanate; the lithium titanate has the particle size range of 0.1-2[mu]m, carbon content of 5-8wt% and nitrogen content of 0.1-1.2%. Compared with the conventional method for synthesizing lithium titanate by calcining a titanium source and a lithium source, a crosslinking reaction of hydrolytic tetrabutyl titanate and melamine is performed firstly in the method disclosed in the invention, and the generated titanium-based polymer is used as the titanium source, so that consistency of distribution of nitrogen, carbon and titanium elements is ensured, thereby reaching uniformity higher than that of the conventional coating means; the negative electrode material of the lithium ion battery has a simple preparation process and low equipment requirement; and the raw materials adopted in the preparation process are low in cost, and preparation of a lithium titanate precursor is not needed, so that the technological steps are simplified, and large-scale industrial production can be realized favorably.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and specifically relates to a high-performance lithium ion battery negative electrode material and a preparation method of the negative electrode material, and also relates to a lithium ion battery using the material as the negative electrode material. Background technique [0002] At present, the frequent replacement of electronic products and the continuous depletion of fossil fuels force human beings to continuously develop alternative clean energy sources. Lithium-ion batteries have been widely used in electronic products and electric vehicles due to their high energy density and long cycle life, which also put forward higher requirements for the safety and fast charging capabilities of lithium-ion batteries. Graphite, as the most widely used anode material at present, has disadvantages such as low first-time Coulombic efficiency, easy formation of lithium dendrites, and easy electrolyte ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/362H01M4/485H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 周宽李明仙吴静珞于强强魏强万黎豪
Owner SHENZHEN BAK POWER BATTERY CO LTD
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