Improve anode material of lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as the inability to meet the requirements of commercial applications, improve overcharge performance and safety performance, increase battery capacity, and avoid direct contact Effect

Inactive Publication Date: 2013-09-04
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the performance of the positive electrode materials modified by these oxide coatings has been improved, they still cannot meet the requirements of commercial applications.

Method used

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  • Improve anode material of lithium ion battery and preparation method thereof
  • Improve anode material of lithium ion battery and preparation method thereof
  • Improve anode material of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Put 0.4311g of lithium carbonate, 2.1887g of aluminum nitrate, 0.16g of titanium dioxide, 0.29g of magnesium oxide and 0.7698g of silicon dioxide in a beaker, add 400ml of deionized water, and stir evenly at a stirring speed of 80Hz. Weigh 100g of lithium cobaltate, add it into a beaker and continue to stir, after mixing evenly, soak and evaporate to dryness to remove water, and dry at 150°C for 24h. The obtained powder was roasted in a muffle furnace, and the roasting system was as follows: heating up to 700 °C at a rate of 10 °C / min, holding the temperature for 10 h, cooling with the furnace, and sieving.

[0037] The physical and chemical analysis of the final product shows that the surface of the raw material lithium cobaltate is coated with a solid electrolyte layer with an average thickness of about 50nm, and the total coating amount is: 1.3% (mass fraction). As shown in Figure 1, the material modified Its microscopic morphology did not change before and after. T...

Embodiment 2

[0041]Put 5.5103g of n-butyl titanate, 2.154g of magnesium nitrate, 1.167g of silicon dioxide and 0.4809g of lithium metasilicate into a beaker, add 700ml of deionized water, under the condition that the temperature of the water bath is 80°C and the stirring speed is 100Hz Next, stir well. Weigh 150g of lithium cobaltate, add it into a beaker and continue stirring for 2h, filter with suction, and dry the filter cake for 24h at 120°C. Put the obtained powder in a furnace for roasting, the roasting system is: 5°C / min to 900°C, keep warm for 5h, cool with the furnace, and sieve.

[0042] Through physical and chemical analysis, it is known that the surface of the raw material lithium cobaltate is coated with a solid electrolyte layer with an average thickness of about 120nm, and the total coating amount is: 3.0% (mass fraction). No change. Pack the modified material into a button battery. The electrode ratio in the button battery is: active material: SP:PVDF=91:4:5, Clgard2300 d...

Embodiment 3

[0044] Put 1.0560g of silicon dioxide, 0.7219g of zirconia, 0.6853g of ammonium vanadate and 0.2950g of lithium hydroxide in a beaker, add 700ml of deionized water, and set the temperature of the water bath at 60°C and the stirring speed at 100Hz. Stir well. Weigh 100g of lithium manganate, add it into a beaker and continue to stir for 4h, filter with suction, and dry the filter cake at 120°C for 36h. The obtained powder is roasted in a bell-type furnace, and the roasting system is as follows: 3°C / min to 1000°C, heat preservation for 2h, cooling with the furnace, and sieving.

[0045] Through physical and chemical analysis, it is known that the surface of the raw material lithium manganate is coated with a solid electrolyte layer with an average thickness of about 100nm, and the total coating amount is: 1.9% (mass fraction). The modified material is packed into a button battery. The electrode ratio in the button battery is: active material: SP: PVDF = 91: 4: 5, Clgard2300 dia...

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Abstract

The invention discloses an improved anode material of a lithium ion battery, which is composed of lithium cobaltate and a solid electrolyte layer coating the outer surface of lithium cobaltate, wherein the solid electrolyte layer consists of Li(1+x)AxB(2-x)Si3O12-eN; 0<=x<=2; the A is one of Al, Sc, La, Cr, V, Fe, Tl, Eu and In; the B is Ti, Zr or Hf; and the N is one or combination of more of Li2O, MgO and Y2O3. The invention also discloses a preparation method of the anode material. The material can realize work at higher voltage and remarkably increase the battery capacity, and also greatly improves the cycle performance, the rate capability, the over-charge performance and the safety performance.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material, in particular to a modified lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, long life, etc., and have been widely used in mobile phones, notebook computers, video cameras, digital cameras, etc. With the advancement of science and technology, lithium-ion batteries will be further developed in the fields of electric vehicles, aerospace and energy storage. [0003] In recent years, due to the continuous improvement of the performance of mobile devices and communication devices, higher requirements have been placed on the performance of lithium-ion batteries such as: energy density, cycle life, high-current input and output performance, and high-temperature performance. The perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/62
CPCY02E60/10
Inventor 徐宁吕菲程晓焜李磊吴孟涛
Owner TIANJIN B&M SCI & TECH
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