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Hollow structure lithium-ion battery positive electrode material and preparation method thereof

A lithium-ion battery, hollow structure technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of limited improvement of the electrochemical performance of positive electrode materials, and avoid poor ion diffusion performance and electron transport performance. The effect of increasing rate performance and improving cycle performance

Active Publication Date: 2015-12-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technical means cannot take into account the rate performance and interface stability at the same time, and have limited effect on improving the electrochemical performance of cathode materials.

Method used

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  • Hollow structure lithium-ion battery positive electrode material and preparation method thereof
  • Hollow structure lithium-ion battery positive electrode material and preparation method thereof
  • Hollow structure lithium-ion battery positive electrode material and preparation method thereof

Examples

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Embodiment 1

[0026] Use nickel, cobalt, and manganese sulfate as raw materials to prepare a metal salt solution (the molar ratio of nickel, cobalt, and manganese is 1:1:1), and select liquid caustic soda with a mass percentage of 32% as a precipitant, with a mass percentage of 18% The ammonia water is used as a complexing agent, and it is added into the reaction kettle in parallel. The coprecipitation is divided into three stages. In the first stage, the pH of the reaction system is controlled to be 11, the ammonia concentration is 15g / l, the temperature is 60°C, and the reaction time is 5 hours; Stage control reaction system pH=11.5, ammonia concentration 13g / l, temperature 60°C, reaction time 3 hours; third stage control reaction system pH=12, ammonia concentration 10g / l, temperature 60°C, reaction time 5 Hour. Get the precursor Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 , and then mixed with lithium carbonate (the molar ratio of lithium to the total amount of nickel, cobalt and manganese is 1.05:1...

Embodiment 2

[0030]Use nickel and manganese sulfate as raw materials to prepare a metal salt solution (the molar ratio of nickel and manganese is 1:1), select liquid caustic soda with a mass percentage of 16% as a precipitant, and ethylenediaminetetraacetic acid with a mass percentage of 10% Disodium is used as a complexing agent, and it is added into the reaction kettle concurrently. Co-precipitation is divided into two stages. In the first stage, the pH of the reaction system is controlled to be 11, the concentration of disodium edetate is 2g / l, and the temperature is 50°C. The reaction time is 5 hours; in the second stage, the pH of the reaction system is controlled to be 11.6, the concentration of disodium edetate is 3 g / l, the temperature is 30° C., and the reaction time is 5 hours. Get the precursor Ni 0.5 mn 0.5 (OH) 2 , and then mixed evenly with lithium acetate (the molar ratio of lithium to the total amount of nickel and manganese is 1.07:1), and then calcined in sections with ...

Embodiment 3

[0033] Use nickel, cobalt, and manganese sulfate as raw materials to prepare a metal salt solution (the molar ratio of nickel, cobalt, and manganese is 1.67:1.67:6.66), and select sodium carbonate with a mass percentage of 15% as a precipitant, with a mass percentage of 18% The ammonia water is used as a complexing agent, and it is added into the reaction kettle in parallel. The coprecipitation is divided into two stages. The first stage controls the reaction system to PH=8, the ammonia concentration is 1g / l, the temperature is 60°C, and the reaction time is 4 hours; In the second stage, the pH of the reaction system is controlled at 8.5, the ammonia concentration is 1 g / l, the temperature is 45° C., and the reaction time is 6 hours. Get the precursor Ni 0.167 co 0.167 mn 0.666 CO 3 , and then mixed with lithium hydroxide (the molar ratio of lithium to the total amount of nickel, cobalt and manganese is 1.55:1) and then calcination in sections with temperature control. The ...

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Abstract

The present invention discloses a hollow structure lithium-ion battery positive electrode material and a preparation method thereof. The preparation method comprises: preparing a metal salt solution, adding the metal salt solution, a precipitation agent and a complexing agent into a reaction kettle, carrying out co-precipitation to prepare a precursor, uniformly mixing the precursor and a lithium source, and carrying out sectional temperature control calcination to obtain the positive electrode material. According to the present invention, the preparation process is simple, the cost is low, the application prospects are broad, and the prepared positive electrode material has characteristics of substantially-improved electrochemical performance, good rate performance, and good cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a hollow structure positive electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] With the increasingly prominent energy and environmental issues and the rapid development of 3C, electric tools and electric vehicles, the application of chemical energy storage devices has reached a climax. Lithium-ion batteries have become people's first choice due to their high operating voltage, long cycle life, high energy density, and no environmental pollution. As the positive electrode material, one of the most critical components in lithium-ion batteries, the currently commercialized positive electrode materials mainly include lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ), lithium manganate (LiMnO 2 ) and nickel-cobalt-manganese ternary material (LiNi 1-x-y co x mn y o 2 (0≤x, y≤1, x+y≤1)) an...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王志兴贺振江李新海郭华军彭文杰胡启阳
Owner CENT SOUTH UNIV
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