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Method for preparing lithium ion battery anode material doped with nanometer oxide

A technology of lithium-ion batteries and nano-oxides, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as initial capacity decline, achieve improved high-temperature cycle performance, improved electrochemical stability, and improved electrochemical stability Effect

Inactive Publication Date: 2010-06-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Jiang Hanxuan of Central South University and others on LiMn 2 o 4 The electrochemical properties of doped Co, Cr, Al, Ni, etc. were studied, and the results showed that: doping improved LiMn 2 o 4 cycle performance, which increases the diffusion coefficient of lithium ions, but the initial capacity of the material after doping decreases to varying degrees.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take a certain amount of lithium carbonate and electrolytic manganese dioxide according to a mass ratio of 1:5, add 50nm nano-alumina powder equivalent to 0.5 mol% of lithium manganate molar fraction, use absolute ethanol as a solvent, and use a ball mill to Grinding at a speed of 300 rpm for 10 hours, followed by vacuum drying and mechanical crushing, to obtain a precursor doped with nano-alumina. The precursor was placed in a programmable temperature-controlled high-temperature furnace, and was calcined at a constant temperature of 500°C, 650°C, and 800°C for 5 hours, 6 hours, and 16 hours, respectively, and cooled to room temperature with the furnace. Finally, the calcined product is subjected to mechanical pulverization, vibration classification and jet pulverization to obtain a nano-alumina-doped lithium manganate positive electrode material.

Embodiment 2

[0024] Take a certain amount of lithium carbonate and electrolytic manganese dioxide according to the mass ratio of 1:5, add 50nm nano-magnesia powder equivalent to 1mol% of the molar fraction of lithium manganate, use absolute ethanol as a solvent, and use a ball mill at 500rpm Grinding at a high speed for 15 hours, followed by vacuum drying and mechanical crushing, to obtain a precursor doped with nano-magnesium oxide. The precursor was placed in a programmable temperature-controlled high-temperature furnace, and was calcined at a constant temperature of 500°C, 650°C, and 800°C for 5 hours, 6 hours, and 16 hours, respectively, and cooled to room temperature with the furnace. Finally, the calcined product is subjected to mechanical pulverization, vibration classification and jet pulverization to obtain a lithium manganate cathode material doped with nano-magnesium oxide.

Embodiment 3

[0026] Take a certain amount of lithium carbonate and electrolytic manganese dioxide according to a mass ratio of 1:5, add 50nm nano-alumina powder equivalent to 0.5 mol% of lithium manganate mole fraction and 0.5 mol% 50nm nano-titanium oxide powder body, using absolute ethanol as a solvent, using a ball mill to grind at a speed of 500rpm for 20 hours, and then vacuum-dried and mechanically crushed to obtain a precursor doped with nano-alumina and nano-titanium oxide. The precursor was placed in a programmable temperature-controlled high-temperature furnace, and was calcined at a constant temperature of 500°C, 650°C, and 800°C for 5 hours, 6 hours, and 16 hours, respectively, and cooled to room temperature with the furnace. Finally, the calcined product is subjected to mechanical pulverization, vibration classification and jet pulverization to obtain a lithium manganate cathode material doped with nano-alumina and nano-titanium oxide.

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Abstract

The invention relates to a method for preparing a lithium ion battery anode material doped with a nanometer oxide, belonging to the technical field of manufacturing processes of lithium ion battery batteries. The method is characterized in that trace amount of nanometer oxide power is doped in the preparation process of lithium manganate, lithium cobaltoxide and lithium iron phosphate; the doping amount is 0.5-1.0 mol percent of lithium salts; and the nanometer oxide is selected from one or two of alumina, magnesia, titanium oxide, chromic oxide, nickel oxide, monox and zirconia and the nanometer oxide is subject to ball milling, drying, sieving, calcinating, crushing, grading and other processes to obtain the nanometer oxide doped or coated lithium ion battery anode material. The lithium ion battery anode material has reversible initial capacitance, and remarkably-improved attenuation property, charging-discharging properties, high-temperature circulating property and electrochemistry stability.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion battery positive electrode material doped with nano-oxide, and belongs to the technical field of lithium-ion battery material manufacturing technology. Background technique [0002] Energy is closely related to the survival and development of human society. With the development of society, the general trend of world energy consumption keeps growing rapidly. It is estimated that energy consumption will increase by 50%-100% by 2020. With the rapid development of the electronics and information industries, there is an urgent requirement for chemical power sources, especially high-energy secondary batteries. Compared with other batteries, lithium-ion batteries have high volume energy density and weight energy density, plus design flexibility, long cycle life, no memory effect, low self-discharge rate, and no pollution to the environment. The prime choice for rechargeable power supplies in toda...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M4/48
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 施利毅张大卫张剑平曹绍梅
Owner SHANGHAI UNIV
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