Preparation method for LiNi0.5Mn1.5O4

A compound and nickel source technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low purity, low specific capacity of lithium-ion batteries, and reduced cycle life of lithium-ion batteries, and achieve low oxygen defects and high purity. Effect

Inactive Publication Date: 2012-05-30
SUZHOU UNIV +1
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Problems solved by technology

LiNi prepared by the above method 0.5 mn 1.5 o 4 Usually contains NiO, Li 1+x Ni 1-x o 2 and other heterogeneous phases, the synthesized LiNi 0.5 mn 1.5 o 4 The purity of Li-ion batteries is low, resulting in low specific capacity of lithium-ion batteries; and, when sintered above 700 ° C, it will lead to LiNi 0.5 mn 1.5 o 4 Oxygen vacancies are generated, thereby bringing a certain amount of Mn 3+ ions, reducing the cycle life of lithium-ion batteries

Method used

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  • Preparation method for LiNi0.5Mn1.5O4
  • Preparation method for LiNi0.5Mn1.5O4
  • Preparation method for LiNi0.5Mn1.5O4

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preparation example Construction

[0030] The invention discloses a LiNi 0.5 Mn 1.5 O 4 The preparation method includes:

[0031] Step a) mixing the nickel source compound and the manganese source compound in a solvent and drying;

[0032] Step b) calcining the dried mixture in step a) at 900-1000°C to obtain a nickel manganese oxide precursor;

[0033] Step c) mixing the nickel manganese oxide precursor with a lithium source compound, and sintering at 700-750°C;

[0034] Step d) Annealing the sintered product in step c in an oxygen atmosphere to obtain LiNi 0.5 Mn 1.5 O 4 .

[0035] According to the present invention, the solvent in the step a) is preferably deionized water, and the nickel source compound and manganese source compound are mixed in the solvent, and preferably formulated to have a mass concentration of 0.4 mol / L to 0.7 mol / L The mass concentration of the solution is more preferably 0.5 mol / L. The drying method in the step a) is preferably a spray drying method, a freeze drying method, and the like. The...

Embodiment 1

[0042] Weigh nickel acetate and manganese acetate with a molar ratio of Ni:Mn of 0.5:1.5, mix them and add deionized water to prepare a 0.5mol / L solution, and dry the resulting solution with a spray dryer to obtain a mixed powder;

[0043] The obtained powder is calcined in an air atmosphere at a constant temperature of 900°C for 20 hours;

[0044] After natural cooling, add lithium acetate with a molar ratio of 2:1 to Ni, grind and mix uniformly, and then calcinate in an air atmosphere at 700°C for 24 hours to obtain untreated LiNi 0.5 Mn 1.5 O 4 ;

[0045] The untreated LiNi 0.5 Mn 1.5 O 4 Calcined in an oxygen atmosphere at a constant temperature of 500°C for 30 hours and cooled to room temperature in air to obtain LiNi 0.5 Mn 1.5 O 4 .

Embodiment 2

[0047] Weigh nickel acetate and manganese acetate with a molar ratio of Ni:Mn of 0.5:1.5, mix them and add deionized water to prepare a 0.5mol / L solution, and dry the resulting solution with a spray dryer to obtain a mixed powder;

[0048] Calcining the obtained powder in an air atmosphere at a constant temperature of 900°C for 20 hours;

[0049] After natural cooling, add lithium hydroxide with a molar ratio of 2:1 to Ni, grind and mix uniformly, and then calcinate in an air atmosphere at 700°C for 24 hours to obtain untreated LiNi 0.5 Mn 1.5 O 4 ;

[0050] The untreated LiNi 0.5 Mn 1.5 O 4 Calcined in an oxygen atmosphere at a constant temperature of 500°C for 30 hours, and cooled to room temperature in an oxygen atmosphere to obtain LiNi 0.5 Mn 1.5 O 4 . Such as figure 1 As shown, the LiNi prepared in this example 0.5 Mn 1.5 O 4 It can be seen from the figure that there is no diffraction peak of impurity phases such as NiO. Therefore, the LiNi prepared in this example 0.5 Mn 1.5 O...

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Abstract

The embodiments of the invention disclose a preparation method for LiNi0.5Mn1.5O4. According to the method, a mixture containing nickel and manganese is prepared; the mixture is calcined at a temperature of 900-1000 DEG C to obtain a nickel manganese oxide precursor; the nickel manganese oxide precursor and a lithium compound are mixed and calcined at the temperature of 650-750 DEG C, and then an annealing treatment is performed in the oxygen atmosphere to obtain the LiNi0.5Mn1.5O4. According to the present invention, the nickel manganese oxide precursor is firstly prepared, and then the lithium compound is added, such that the direct contact of the lithium compound and the manganese compound, and the direct contact of the lithium compound and the nickel compound are avoided so as to avoid the generations of NiO, Li(1+x)Ni(1-x)O2 and other impurity phases; the annealing treatment is performed in the oxygen atmosphere so as to compensate the oxygen defects generated during the sintering process, such that the purity of the prepared LiNi0.5Mn1.5O4 is high, and the oxygen defects are less.

Description

Technical field [0001] The invention relates to the technical field of secondary batteries, and more specifically, to a LiNi 0.5 Mn 1.5 O 4 The preparation method. Background technique [0002] In recent years, with the increasing depletion of resources and the emergence of global warming and other issues, a green and low-carbon lifestyle has been advocated. Among them, the development of electric vehicles and hybrid electric vehicles to partially replace internal combustion engine vehicles that consume fossil fuels is one of the main methods to solve the energy crisis and environmental degradation. Driving power is a key component that affects the promotion and use of electric vehicles. Nowadays, the widely used driving power includes lead-acid batteries, nickel-metal hydride / nickel-cadmium, and lithium-ion batteries. Among various driving power sources, lithium-ion batteries have been extensively studied due to their advantages of high energy density, good cycling, low self-di...

Claims

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Application Information

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IPC IPC(8): H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 贺诗词刘冰张茜汝坤林郑军伟李德成
Owner SUZHOU UNIV
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