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Lithium ion battery negative electrode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of large volume expansion effect, capacity attenuation, and low conductivity

Active Publication Date: 2020-12-01
安徽天时新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

of which NiFe 2 o 4 The theoretical specific capacity is 915mAh / g, which is much higher than that of graphite carbon materials, and has good electrochemical performance (Ding Y, Journal of Power Sources, 2013, 244:610-613), but NiFe 2 o 4 The low conductivity and large volume expansion effect in the charge and discharge process lead to serious capacity fading, large irreversible capacity, and poor cycle performance (Zhao H, Electrochemistry Communication, 2007, 9: 2606-2610; Abrca C V, Journal of Chemical Physics C, 2010 , 114:12828-12832), restricting the development of its practical application
Chinese invention patent (CN103700842A) describes a NiFe 2 o 4 / C Lithium-ion battery negative electrode material and its preparation, the method uses hydrazine as a reducing agent to prepare the negative electrode material precursor in an alkaline environment, and uses non-graphitizable carbon to compound the negative electrode material, and the non-graphitizable carbon can increase the conductivity of the material However, the irreversible capacity of non-graphitized carbon is very high, and there is a phenomenon of voltage hysteresis, which limits the improvement of the electrochemical performance of the material.

Method used

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  • Lithium ion battery negative electrode material and preparation method thereof
  • Lithium ion battery negative electrode material and preparation method thereof
  • Lithium ion battery negative electrode material and preparation method thereof

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preparation example Construction

[0027] The invention provides a kind of preparation method of lithium ion battery negative electrode material, comprises the following steps:

[0028] (1) Weigh molybdenum powder, silicon powder, boron powder and 2 molybdenum alloy powder, the sum of the mass fractions of the above components is 100%; the above-mentioned raw material components weighed are put into a planetary high-energy ball mill for ball milling, and an inert gas is introduced during the ball milling process to keep the ball milling tank The gas pressure is 0.2-0.5MPa;

[0029] (2) sieve the powder mixture after the above-mentioned ball milling treatment, and pass through a 300-400 mesh sieve;

[0030] Then put the powder mixture in the atmosphere resistance furnace, pass high-purity nitrogen gas to fully discharge the air, heat it to 1850-1900°C for calcination, and naturally cool the sintered product with the furnace to obtain Mo 5 SiB 2 -ZrB 2 Complex;

[0031] (3) Disperse zirconium oxychloride oct...

Embodiment 1

[0056] A preparation method for a lithium ion battery negative electrode material, comprising the following steps:

[0057] (1) Weigh molybdenum powder, silicon powder, boron powder and 2 molybdenum alloy powder, the sum of the mass fractions of the above components is 100%; put the above-mentioned weighed raw material components into a planetary high-energy ball mill for ball milling, and nitrogen gas is introduced during the ball milling process to keep the gas in the ball milling tank The pressure is 0.35MPa; the revolution speed of the planetary high-energy ball mill is 80rpm, and the rotation speed is 630pm.

[0058] Described molybdenum powder, silicon powder, boron powder and containing ZrB 2 The molar ratio of the molybdenum alloy powder is 4.2:0.8:2.0:1; wherein, the ZrB 2 The mass fraction in molybdenum alloy powder is 2.5wt%.

[0059] (2) sieve the powder mixture after the above-mentioned ball milling process, and pass through a 400 mesh sieve;

[0060] Then put...

Embodiment 2

[0072]This embodiment is basically the same as the preparation method of lithium ion battery negative electrode material in embodiment 1, the difference is,

[0073] Described molybdenum powder, silicon powder, boron powder and containing ZrB 2 The molar ratio of the molybdenum alloy powder is 3.5:0.6:1.5:1; wherein, the ZrB 2 The mass fraction in molybdenum alloy powder is 2.5wt%;

[0074] With the rest unchanged, a lithium ion battery was prepared according to the preparation method of the positive electrode, the negative electrode and the lithium ion battery of the lithium ion battery in Example 1.

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Abstract

The invention belongs to the technical field of lithium batteries and relates to a lithium ion battery negative electrode material and a preparation method thereof. The preparation method comprises the following steps of: respectively preparing a Mo5SiB2-ZrB2 compound and a lithium-doped zirconium vanadate material; dispersing the Mo5SiB2-ZrB2 compound and the lithium-doped zirconium vanadate material into a proper amount of distilled water; stirring and mixing the Mo5SiB2-ZrB2 compound and the lithium-doped zirconium vanadate material; transferring the mixture into a hydrothermal automatic reaction kettle, carrying out activation reaction; transferring a product into a reaction bottle; putting the reaction bottle into an ultrasonic dispersion instrument; heating to 70-85 DEG C, carrying out ultrasonic treatment for 2 hours; cooling a solution, and then centrifuging to remove distilled water; and drying a solid product so as to obtain the lithium ion battery negative electrode material. According to the lithium ion battery negative electrode material and the preparation method thereof of the invention, lithium is doped into a zirconium vanadate material, so that the zirconium vanadate material has relatively good thermal shrinkage and cold expansion capabilities, and therefore, the volume change of the lithium ion battery negative electrode material in the charging and discharging process or when the temperature rises can be counteracted, the stability of the lithium ion battery negative electrode material is improved, the internal resistance of the material is reduced, andthe purposes of prolonging the cycle life of the lithium ion battery negative electrode material and improving the rate discharge performance of the material are achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of chemical power source. Because of its advantages of high energy density, high working voltage, long life and no environmental pollution, it is widely used in various portable electronic products and has been used as an electric vehicle or hybrid power supply. Automotive power batteries, aerospace energy storage devices. As a key part of promoting the development of lithium-ion batteries, anode materials have become a hot spot for researchers. [0003] Graphite carbon has a series of advantages such as a layered structure suitable for lithium ion intercalation / extraction, good electrical conductivity, chemical stability, and low cost. It is currently the most successful commercial anode material, but the theor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/58H01M4/62H01M10/0525H01M10/42
CPCH01M4/58H01M4/485H01M4/628H01M10/0525H01M10/4235H01M2004/027Y02E60/10
Inventor 王兴赵俊伟吴伟杰景慧娟
Owner 安徽天时新能源科技有限公司
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