Single-crystal appearance layered nickel lithium manganate positive electrode material and preparation method thereof
A technology of lithium nickel manganese oxide and positive electrode materials, which is applied in the field of layered lithium nickel manganese oxide positive electrode materials and its preparation, can solve problems such as lack of coordination, nickel-lithium mixed row, and influence on the electrochemical performance of positive electrode materials, and achieve electrochemical performance. Excellent performance, improved volume energy density, and improved structural stability
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[0048] Example 1
[0049] Nickel nitrate and manganese nitrate were dissolved in deionized water at a molar ratio of 1:1 to prepare a salt solution with a metal ion concentration of 0.6 mol / L. At the same time, sodium hydroxide with the same volume and the same concentration was prepared as a precipitant, 0.5 mol / L Ammonia water is used as a complexing agent, and the three components are introduced into the reaction kettle in equal volumes with a peristaltic pump. The reaction temperature is controlled to 50±0.5°C, the pH value is 9±0.2, and the stirring speed is 1200r / min. After reacting for 20 hours, the precipitate obtained was washed with deionized water three times, and dried at 120°C for 18 hours under a nitrogen atmosphere to obtain a nickel manganese double hydroxide precursor Ni 0.5 Mn 0.5 (OH) 2 , Its D 50 4.4μm, BET is 87.4m 2 / g.
[0050] The precursor is pre-fired at 500° C. for 4 hours, and the product obtained is the nickel manganese oxide precursor. The oxide precu...
Example Embodiment
[0053] Example 2
[0054] Nickel nitrate and manganese sulfate were dissolved in deionized water at a molar ratio of 1:1 to prepare a salt solution with a metal ion concentration of 0.5 mol / L. At the same time, sodium hydroxide of the same volume and the same concentration was prepared as a precipitant, 0.7 mol / L Ammonia water was used as a complexing agent, and the three components were introduced into the reaction kettle in equal volumes with a peristaltic pump. The reaction temperature was controlled to 80±0.5°C, the pH value was 10.5±0.2, and the stirring speed was 700r / min. After 13 hours of reaction, the precipitate obtained was washed three times with deionized water, and dried at 115°C for 28 hours under a nitrogen atmosphere to obtain nickel-manganese double hydroxide precursor Ni 0.5 Mn 0.5 (OH) 2 , Its D 50 3.9μm, BET is 98.1m 2 / g.
[0055] The precursor is pre-fired at 550° C. for 3 hours, and the product obtained is the precursor of nickel manganese oxide.
[0056] The...
Example Embodiment
[0058] Example 3
[0059] Nickel acetate and manganese acetate were dissolved in deionized water at a molar ratio of 1:1 to prepare a salt solution with a metal ion concentration of 0.9 mol / L. At the same time, the same volume of sodium carbonate with the same concentration was prepared as a precipitant, and 0.8 mol / L ammonia As a complexing agent, the three components are introduced into the reactor in equal volumes with a peristaltic pump, the reaction temperature is controlled to be 65±0.5°C, the pH value is 12.0±0.2, and the stirring speed is 1000r / min. After 9 hours of reaction, the precipitate obtained was washed with deionized water three times, and dried at 130°C for 18 hours under a nitrogen atmosphere to obtain nickel manganese carbonate precursor Ni 0.5 Mn 0.5 CO 3 , Its D 50 3.6μm, BET is 115.8m 2 / g.
[0060] The above-mentioned precursor is pre-fired at 480°C for 6 hours, and the product obtained is the nickel-manganese oxide precursor.
[0061] The oxide precursor, th...
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