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Light metal doping lithium manganate positive electrode material of lithium ion battery and preparation method of positive electrode material

A technology for battery lithium manganate and positive electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of uneven mixing, large particles, and high production costs, and achieve high specific capacity, high crystallinity, and uniform particles Effect

Inactive Publication Date: 2016-08-24
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid-phase method is simple to operate, but it is easy to cause defects such as uneven mixing and relatively large particles.
Co-precipitation method is the most common method at present, but the synthesis process is complicated, and the process adjustment and control are relatively strict. It needs to go through multiple steps such as precipitation and washing, which will easily lead to the imbalance of nickel, cobalt and manganese in the product.
The product synthesized by sol-gel method has uniform particles, good crystallization, and high purity; but the final particle size is not easy to control, and the production cost is high

Method used

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  • Light metal doping lithium manganate positive electrode material of lithium ion battery and preparation method of positive electrode material
  • Light metal doping lithium manganate positive electrode material of lithium ion battery and preparation method of positive electrode material
  • Light metal doping lithium manganate positive electrode material of lithium ion battery and preparation method of positive electrode material

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Effect test

Embodiment 1

[0022] Embodiment 1: A kind of preparation method of lithium manganese oxide cathode material of lithium ion battery, adopts following process steps:

[0023] (1) manganese dioxide and lithium carbonate are 2: 1 in molar ratio, after mixing, add 1% ethanol, grind;

[0024] (2) heating the mixture obtained in step (1) at 150-500° C. for 12 hours, then cooling naturally to obtain a dry precursor, which is uniformly ground;

[0025] (3) Mix the dried precursor with Al(NO3)3, and calcining, the calcining temperature is 700°C, the calcining time is 20 hours, after calcining, it is naturally cooled to room temperature and then ground again on a ball mill for 0.5 hours to obtain the Power lithium ion battery lithium manganese oxide cathode material Li 1.03 Al x mn 1.97-x o 4 (x=0.025, 0.05, 0.10).

Embodiment 2

[0026] Embodiment two: a kind of preparation method of lithium manganate positive electrode material of lithium ion battery, adopt following process step:

[0027] (1) Manganese acetate and lithium acetate are mixed in a molar ratio of 2: 1, mixed evenly, then added with 1% ethanol, and ground;

[0028] (2) heating the mixture obtained in step (1) at 100-400° C. for 12 hours, then cooling naturally to obtain a dry precursor, which is evenly ground;

[0029] (3) Mix the dried precursor with Al(NO3)3, and calcining, the calcining temperature is 650°C, and the calcining time is 25 hours. After calcining, it is naturally cooled to room temperature and ground again on a ball mill for 1.5 hours to obtain the Power lithium ion battery lithium manganese oxide cathode material Li 1.03 Al x mn 1.97-x o 4 (x=0.025, 0.05, 0.10);

Embodiment 3

[0030] Embodiment three: a kind of preparation method of lithium manganese oxide cathode material of lithium ion battery, adopt following process step:

[0031] (1) Mix manganese carbonate and lithium acetate in a molar ratio of 2:1, mix well and add 1% ethanol, and grind;

[0032] (2) heating the mixture obtained in step (1) at 100-400° C. for 12 hours, then cooling naturally to obtain a dry precursor, which is uniformly ground;

[0033] (3) Mix the dried precursor with CaO, and calcining, the calcining temperature is 750°C, and the calcining time is 20 hours, after calcining, it is naturally cooled to room temperature, and then ground again on a ball mill for 0.5 hours to obtain the power lithium-ion battery LiMn2O4 lithium manganate cathode material;

[0034] The positive electrode material that embodiment one obtains is carried out XRD detection, the result is as follows figure 1 as shown, figure 1 The abscissa is the scanning range 2θ (10-90°), and the ordinate is the ...

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Abstract

The invention relates to preparation and improvement methods for a light metal doping lithium manganate positive electrode material of a lithium ion battery. The preparation method comprises the following steps of (1) uniformly mixing a manganate salt, a lithium salt and a small amount of solvent, and preparing for calcination; (2) heating the obtained mixture in an air atmosphere to obtain a precursor; (3) naturally cooling the precursor, adding a doping element, and uniformly grinding the precursor and the doping element; (4) uniformly mixing and grinding the obtained precursor and an appropriate amount of coating material; and (5) roasting the above powder to obtain a powder material, naturally cooling the powder material to a room temperature and grinding the powder material in a ball-milling machine, thereby obtaining the lithium manganate positive electrode material of the power lithium ion battery. The positive electrode material prepared according to the method is uniform in particle and high in crystallization property; and the spinel-shaped positive electrode material provided by the invention has high specific capacitance and relatively high electrochemical performance such as favorable cycle performance, is suitable for mass production, and can be applied to the positive electrode material of the power lithium ion battery.

Description

technical field [0001] The invention relates to a lithium manganate cathode material for a power lithium ion battery and a preparation method thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion batteries quickly occupy the consumer market due to their high energy and environmental friendliness, and are widely used in portable electronic products, electric vehicles and other fields. Looking at the current main cathode materials, lithium manganese oxide LiMn 2 o 4 The positive electrode material shows unique advantages, namely high energy, high discharge voltage platform, high safety, environmental protection and low price, etc. It is considered to be one of the most likely commercial positive electrode materials to replace lithium cobalt oxide. However, this material also has shortcomings such as poor high-temperature cycle performance, and cannot fully meet the high energy and high power density required by the mark...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/62
CPCY02E60/10
Inventor 张海朗唐婷
Owner JIANGNAN UNIV
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