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Preparation method for niobium/tantalum cation disordered rock salt structure anode material

A cathode material and cation technology, applied in the field of preparation of cathode materials containing niobium/tantalum cation disordered rock salt structure, can solve the problems of expensive niobium salt, easy hydrolysis, easy introduction of impurities, etc. The effect of a simple synthesis process

Active Publication Date: 2019-02-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Description
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  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art, to provide a method for preparing a positive electrode material with a disordered rock salt structure containing niobium / tantalum cations, and for the first time to use a wet chemical method to synthesize a positive electrode material containing Nb oxide, which solves the problem of the prior art Niobium salt precursor is expensive, easy to hydrolyze, and easy to introduce impurities

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  • Preparation method for niobium/tantalum cation disordered rock salt structure anode material
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  • Preparation method for niobium/tantalum cation disordered rock salt structure anode material

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preparation example Construction

[0031] The preparation embodiment of cathode material (concrete preparation process is as figure 1 shown):

[0032] Synthetic raw materials: niobium / tantalum citrate precursor solution, soluble nickel salt (analytical pure), soluble cobalt salt (analytical pure), soluble manganese salt (analytical pure), citric acid (analytical pure), deionized water.

Embodiment 1

[0034] Prepare a manganese nitrate solution with a cation concentration of 1.5mol / L, add an appropriate amount of citric acid, and the molar ratio of metal manganese ions to citric acid is 1:1. An appropriate amount of water-soluble niobium citrate precursor solution is added so that the molar ratio of niobium ions to transition manganese metal ions is Nb:TM=1:1.3. The above solution was evaporated to dryness by heating at 90° C., and then dried at 150° C. for 12 hours to form a powder precursor; the powder precursor was pretreated at 350° C. for 2.0 hours. After mixing the pre-calcined powder with an appropriate amount of lithium salt, the amount of lithium salt should be added in excess of 5wt.%. Using ethanol as the medium, ball mill for 6 hours at a speed of 500r / min. After drying and compacting, it was annealed at 850 °C for 12 hours in an Ar atmosphere in a tube furnace to obtain Li 1.3 Nb 0.3 mn 0.4 o 2 Cationic disordered oxide powder samples. The oxide material i...

Embodiment 2

[0036] Prepare a cobalt nitrate solution with a cation concentration of 0.2mol / L, add an appropriate amount of citric acid, and the molar ratio of metal cobalt ions to citric acid is 1:0.5. An appropriate amount of water-soluble niobium citrate precursor solution is added so that the molar ratio of niobium ions to metal cobalt ions is Nb:TM=1:0.5. The above solution was evaporated to dryness by heating at 70° C., and then dried at 100° C. for 24 hours to form a powder precursor; the powder precursor was pretreated at 300° C. for 3.0 hours. After the pre-calcined powder is mixed with an appropriate amount of lithium salt, the amount of lithium salt should be added in excess of 10wt.%. Using ethanol as the medium, ball mill at 300r / min for 12 hours. After drying and compacting, in a tube furnace N 2 Annealing at 1000°C for 6 hours under atmospheric conditions yields Li 1.25 Nb 0.5 co 0.25 o 2 Cationic disordered oxide powder samples. The oxide material is used as the posit...

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Abstract

The invention discloses a preparation method for a niobium / tantalum cation disordered rock salt structure anode material, and belongs to the field of new energy materials. According to the method, a stable water-soluble citric acid Nb / Ta precursor is adopted, the Nb / Ta cation disordered rock salt structural oxide anode material is synthesized through a wet chemistry method, a synthesis process issimple, the reaction is easy to control, the production efficiency is high, and special equipment or protection is not needed; and the phase purity of oxide can be improved, the grain size and the like can be optimized, and meanwhile, the electrochemical performance of the oxide anode material can be improved.

Description

technical field [0001] The invention relates to the field of new energy materials, in particular to a method for preparing a positive electrode material with a disordered rock salt structure containing niobium / tantalum cations. Background technique [0002] Due to a series of outstanding advantages such as high energy density, light weight, no memory effect, good rate performance, and long cycle life, lithium-ion batteries are recognized as the ideal energy source for next-generation electric vehicles and hybrid electric vehicles. The energy density of lithium-ion batteries mainly depends on the energy density of cathode materials, so the development of cathode materials with high energy density has become the focus of attention. [0003] Ordered rock-salt structure layered cathode materials, as a large category of cathode materials, are unanimously favored by the scientific community. The ordered structure of cathode materials has been considered as an important condition ...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/485H01M4/505H01M10/0525
CPCC01G53/006C01P2004/03C01P2006/40C01P2006/80H01M4/485H01M4/505H01M10/0525Y02E60/10
Inventor 孔继周陈瑶周飞王谦之
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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