Method for preparing high-temperature lithium manganate material for lithium ion power battery

A power battery, lithium manganate technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of rapid material capacity decay, material performance deterioration, poor cycle stability, etc., to achieve outstanding high temperature performance, improve uniformity performance, reliability, and comprehensive performance

Active Publication Date: 2011-05-25
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the Jahn-Teller effect, the manganese-oxygen octahedral structure inside the spinel-type lithium manganese oxide material is not stable during the charge-discharge cycle,

Method used

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  • Method for preparing high-temperature lithium manganate material for lithium ion power battery
  • Method for preparing high-temperature lithium manganate material for lithium ion power battery
  • Method for preparing high-temperature lithium manganate material for lithium ion power battery

Examples

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Example Embodiment

[0031] Example 1

[0032] Prepare the following aqueous solutions for use: 1.5mol / L (mol / L) manganese sulfate solution, 0.5mol / L magnesium nitrate (dopant) solution, 2mol / L sodium hydroxide solution, add 100dm per cubic meter of sodium hydroxide solution 3 Concentrated ammonia. At 5m 3 Inject 200dm into the stirred thermostatic titanium-lined reactor 3 Pure water, start stirring, set the reaction temperature to 10°C, use real-time pH automatic control device to control the injection of sodium hydroxide (ammonia-containing water), and control the pH range of the system between 11-12. Use a metering pump to inject the manganese sulfate and magnesium sulfate solutions into the reactor at multiple points, and the flow rates are respectively controlled to 20dm 3 ·Min -1 And 1.54dm 3 ·Min -1 , Stop injection after 1.5h. The reaction was continued for 1 hour and then the material was discharged. Use a filter press to filter, fully press dry and wash the precipitate with pure water 10 t...

Example Embodiment

[0034] Example 2

[0035] Prepare the following aqueous solutions for use: 4mol / L manganese chloride solution, 2mol / L cobalt sulfate (dopant) solution, 5mol / L potassium hydroxide solution, add 200dm per cubic meter of potassium hydroxide solution 3 Concentrated ammonia. At 5m 3 Inject 200dm into the stirred thermostatic titanium-lined reactor 3 Pure water, 50dm 3 Concentrated ammonia water, start stirring, set the reaction temperature to 35°C, use real-time pH automatic control device to control the injection of potassium hydroxide (ammonia water), and control the pH range of the system to be between 8-11. Use a metering pump to inject the manganese chloride and cobalt sulfate solutions into the reactor at multiple points, and the flow rates are respectively controlled to 20dm 3 ·Min -1 And 2dm 3 ·Min -1 , Stop injection after 1.5h. The reaction was continued for 3 hours and the material was discharged. Use a filter press to filter, fully press dry and wash the precipitate with ...

Example Embodiment

[0037] Example 3

[0038] Prepare the following aqueous solutions for use: 0.5mol / L manganese nitrate solution, 0.1mol / L nickel sulfate (dopant) solution, 1mol / L sodium carbonate solution. At 0.1m 3 Inject 10dm into the stirred thermostat PTFE lined reactor 3 Pure water, 0.5dm 3 Concentrated ammonia, start stirring, and set the reaction temperature to 52°C. Use a metering pump to inject manganese nitrate, nickel sulfate and sodium carbonate solutions into the reactor at multiple points, and the flow rates are respectively controlled to 1dm 3 ·Min -1 , 0.02dm 3 ·Min -1 And 1.2dm 3 ·Min -1 , Stop injection after 0.5h. The reaction was continued for 0.5h and then the material was discharged. Use a centrifugal washing machine to filter and wash, and the solids are air-dried at 140°C for 12 hours. Determine the manganese content of the powder, stir and disperse the powder obtained in the previous step with an appropriate amount of benzene in the reactor, and add the coating agent al...

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Abstract

The invention provides a method for preparing a high-temperature lithium manganate material for a lithium ion power battery. The method comprises the following steps of: 1) preparing a bivalent manganese soluble salt, a doping element soluble salt and a precipitator serving as raw materials into aqueous solution, putting into a reaction kettle to fully react at the temperature of between 1 and 55DEG C and controlling the pH value of a reaction system to be between 8 and 12; 2) filtering after the reaction is finished, and washing a solid matter; 3) blowing to dry an obtained intermediate product at the temperature of between 90 and 150 DEG C; 4) adding a dispersing agent and a coating agent and coating in the reaction kettle; 5) filtering and drying to obtain a precursor; and 6) mixing the precursor and a lithium source according to a proportion, calcining in an oxidation atmosphere at the temperature of between 600 and 1,000 DEG C for 2 to 12 hours, crushing and sieving to obtain a product. The lithium manganate material prepared by the method has high high-temperature adaptability; and the capacity holding ratio exceeds 90 percent after the lithium manganate material is cycled at a high rate for 100 times at the temperature of 45 DEG C.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium ion battery, in particular to a preparation method for a high temperature lithium manganese oxide material for a lithium ion power battery. Background technique [0002] Lithium-ion battery is a secondary battery with high energy density, high power density and long life, which plays an important role in modern society. In small mobile devices, lithium-ion batteries are irreplaceable; at the same time, power lithium-ion batteries are ideal power sources for large, high-power devices such as electric vehicles, hybrid vehicles, and power tools. In such large-scale, high-power applications, there are higher requirements for the safety, energy and power density, and cost of lithium-ion batteries. In lithium-ion batteries, the cathode material is one of the decisive factors for battery performance and cost, and its optimization and optimization is an important direction for the improvemen...

Claims

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Application Information

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IPC IPC(8): H01M4/1391
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 赵明周大桥吕菲徐宁吴孟涛
Owner TIANJIN B&M SCI & TECH
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