Preparation method of lithium manganate cathode material

A cathode material, lithium manganate technology, used in manganate/permanganate, battery electrodes, electrical components, etc., can solve the problems of wide particle size distribution, uneven composition of synthetic materials, uneven mixing, etc. Achieve the effects of excellent high temperature cycle performance, simple preparation method and easy operation

Active Publication Date: 2016-03-23
TIANJIN B&M SCI & TECH
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  • Abstract
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  • Claims
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Problems solved by technology

One is the solid-phase method: the manganese source, lithium source and doping elements are mixed by solid-phase mixing method, and then the lithium manganate material is prepared by roasting, crushing and other processes. Due to the uneven mixing of the materials, the composition of the synthetic material will Uneven, wide range of particle size distribution, and uneven morphology affect the physical, chemical and electrochemical properties of battery materials
The other is the liquid phase method: the manganese source, lithium source and dopant elements are used as a dispersant in solvents such as ethanol, and the raw materials are mixed by liquid phase ball milling. This method is not easy to industrialize due to the use of organic solvents as dispersants Production

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  • Preparation method of lithium manganate cathode material

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Embodiment 1

[0021] A preparation method of lithium manganate cathode material includes the following steps:

[0022] 1) Prepare 10L of 2mol / L manganese sulfate solution, 10L of 0.1mol / L cobalt sulfate solution, and 10L of 0.05mol / L chromium sulfate solution respectively, mix the three solutions and stir for 1h to obtain a mixed salt solution;

[0023] 2) Prepare 10L of sodium hydroxide solution and ammonia solution each with a concentration of 1mol / L, and obtain a precipitation agent solution after mixing;

[0024] 3) Add 10L of deionized water to the 100L reactor as the bottom liquid, and use a peristaltic pump to control the flow rate of the mixed salt solution and the precipitant solution, and pump them into the reactor at the same time, and control the pH of the solution to be in the range of 7-13 Inside, the temperature of the reaction kettle is room temperature, and the stirring speed is 200 revolutions / min, until all the salt solution is added to the reaction kettle;

[0025] 4) According ...

Embodiment 2

[0030] A preparation method of lithium manganate cathode material includes the following steps:

[0031] 1) Prepare 10L of 0.2mol / L manganese sulfate solution, 10L of 0.02mol / L cobalt sulfate solution, and 10L of 0.02mol / L chromium nitrate solution respectively, mix the three solutions and stir for 1h to obtain a mixed salt solution;

[0032] 2) Prepare 10L each of 2mol / L sodium hydroxide solution and ammonia solution, and mix to obtain a precipitation agent solution;

[0033] 3) Add 10L of deionized water to the 100L reactor as the bottom liquid, and use a peristaltic pump to control the flow rate of the mixed salt solution and the precipitant solution, and pump them into the reactor at the same time, and control the pH of the solution to be in the range of 7-13 Inside, the temperature of the reaction kettle is room temperature, and the stirring speed is 300 revolutions / min, until all the salt solution is added to the reaction kettle;

[0034] 4) According to the molecular formula of...

Embodiment 3

[0039] A preparation method of lithium manganate cathode material includes the following steps:

[0040] 1) Prepare 10L of 0.5mol / L manganese nitrate solution, 5L of 0.5mol / L cobalt nitrate solution, and 5L of 0.5mol / L chromium chloride solution respectively, mix the three solutions and stir for 1h to obtain a mixed salt solution;

[0041] 2) Prepare 10L of sodium hydroxide solution and ammonia solution each with a concentration of 3mol / L, and obtain a precipitation agent solution after mixing;

[0042] 3) Add 10L of deionized water to the 100L reactor as the bottom liquid, and use a peristaltic pump to control the flow rate of the mixed salt solution and the precipitant solution, and pump them into the reactor at the same time, and control the pH of the solution to be in the range of 7-13 Inside, the temperature of the reaction kettle is room temperature, and the stirring speed is 300 revolutions / min, until all the salt solution is added to the reaction kettle.

[0043] 4) According ...

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Abstract

The invention discloses a preparation method of a lithium manganate anode material. The preparation method comprises the following steps: (1) preparing a salt-mixture solution; (2) preparing a precipitant solution; (3) slowly pumping the salt-mixture solution and the precipitant solution into a reaction kettle at a pH value of 7-13; (4) weighing manganese dioxide in proportion, adding the manganese dioxide to a mixed solution obtained in the step (3), continuously stirring, ageing for 5-20 hours, then separating solid-liquid products, and washing an obtained precursor with deionized water to alkalescence; (5) adding a lithium source and the washed precursor to a ball-milling tank, carrying out ball-milling for 2-5 hours, and then drying at the temperature of 80-120 DEG C, thus obtaining a precursor material; and (6) respectively roasting the obtained precursor material two times, breaking the material obtained by sintering, and sieving, thus obtaining the lithium manganate anode material. The preparation method is simple; the prepared lithium manganate anode material has high capacity and excellent high-temperature cycle performance.

Description

Technical field [0001] The invention relates to a lithium ion secondary battery, in particular to a method for preparing a lithium manganate cathode material. Background technique [0002] Lithium-ion secondary batteries are widely used in portable electronic products, electric vehicles, secondary charging and energy storage, aerospace and other fields because of their advantages of high energy density, long cycle life, and low self-discharge rate. The performance of lithium-ion batteries largely depends on the cathode material. Currently, the commonly used cathode materials for lithium-ion batteries mainly include lithium cobalt oxide, ternary materials, and lithium iron phosphate. Lithium cobalt oxide has been widely used in the cathode material of commercial lithium-ion batteries due to its high specific energy, stable discharge, high working voltage, and good cycle performance. However, due to the lack of cobalt resources, high prices and environmental pollution Seriously, r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505
CPCC01G45/12H01M4/505H01M10/0525Y02E60/10
Inventor 徐宁魏玉研吕菲程晓焜
Owner TIANJIN B&M SCI & TECH
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