A kind of lithium ion battery electrode active material precursor manganese nickel carbonate

Abstract

The invention discloses an active substance precursor nickel manganese carbonate of a lithium ion battery electrode. The active substance precursor nickel manganese carbonate is prepared according to the following steps of (A) dissolving a mixture of a divalent nickel salt with mole ratio and mole number of nickel ion and manganese ion and a divalent manganese salt with mole number with water to prepare a solution A, sequentially adding the water, an addition agent and a solvent into a mixture of a carbonate precipitator of which mole weight is the total mole number of the divalent nickel salt and the divalent manganese salt and a surfactant, stirring the above mixture until the carbonate precipitator and the surfactant are dissolved, no solid is precipitated and a solution is transparent to prepare a solution B; (B) injecting the solution A into the solution B under the condition of continuously stirring the solution B, and continuously stirring the solution; and (C) carrying out centrifugal separation on the reaction mixture in the step (B), washing the reaction mixture with the water until no sulfate radical or carbonate radical is detected or filtering and drying an eluate to obtain the nickel manganese carbonate precursor. The material has the advantages of regular morphology, uniform grain, rich and low synthesis raw material, simplicity and convenient in synthesis step, simplicity in a device, easiness in condition control, and short reaction time.

Description

technical field [0001] The invention relates to the technical field of battery materials, and more specifically relates to a lithium ion battery electrode active material precursor manganese nickel carbonate. Background technique [0002] Regular appearance, appropriate particle size, and uniform particle size distribution are one of the important signs that high-performance lithium-ion battery cathode materials have good processing performance. Most of the positive electrode active materials used in the industrial manufacturing of lithium-ion secondary battery positive electrodes are LiCoO 2 , LiMn 2 o 4 , LiNiO 2 and other compounds, or compounds based on three compounds doped with each other, the so-called binary materials (such as LiNi x mn 2-x o 4 、LiCo x mn 2-x o 4 、LiNi x co 1-x o 2 、LiNi 0.5 mn 1.5 o 4 etc.) or metal oxides such as nickel manganese cobalt and ternary materials (such as LiNi x co y mn 2-x-y o 4 、LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 etc. ...

AI Technical Summary

Problems solved by technology

[0017] First, the morphology of the precursors and cathode materials of lithium-ion battery cathode materials synthesized by the existing synthesis technology is relatively irregular, the morphology is difficult to control, the particle size is not uniform, the performance of the material and the processing performance (especially the uniformity of dispersion) ) is greatly restricted, which directly affects the consistency of the battery production process, that is, the product, and increases the manufacturing cost

[0018] Second, solid state reaction synthesis of LiNi 0.5 mn 1.5 o 4 The performance consistency of the precursors of lithium-ion battery cathode materials and cathode materials is not good, it is easy to mix impurities, the reaction speed is slow, the reaction time is long, the energy consumption is high, and usually only easily decomposed compounds can be used, and will not The oxides, hydroxides, nitrates, acetates, etc. that produce impurities are used as raw materials, and the synthesis cost is relatively high. Although a certain scale of production can be achieved, it is difficult to achieve wide application

[0019] Third, hydrothermal or hydrothermal LiNi 0.5 mn 1.5 o 4 Such as lithium-ion battery positive electrode material precursor or positive electrode material synthesis, although there are no shortcomings or defects such as uneven reaction, long reaction time and high cost of solid-state reaction synthesis technology, but there are also high energy consumption, complicated process steps, and control of process conditions. More stringent, higher technical requirements for equipment, etc., and the reaction is carried out in a solution state. Due to the limitation of the concentration, the amount of synthetic products is very limited. If the solution concentration is greatly increased or the volume of the reactor is increased, the synthesis technology will be greatly increased. Difficulty, product performance such as LiNi 0.5 mn 1.5 o 4 Uncertainty in the structure, morphology, particle size and electrochemical performance of etc. is also greatly increased.

Nanomaterials, as battery cathode materials, also have significant defects: poor thermodynamic stability and relatively serious surface chemical reactions (document "ChemInform Abstract: Nanostructured Materials for Electrochemical Energy Conversion and Storage Devices [J]". Adv.Mater.2008,20 : 2878-2887.) In addition, the dispersion of nano-sized positive electrode materials due to agglomeration is poor, which brings certain difficulties to the production of battery positive electrode sheets, and may also affect the effective use of the potential comprehensive electrochemical performance of positive electrode active materials , which in turn affects the actual electrochemical performance of lithium-ion batteries

Moreover, too fine nano-particle cathode materials will affect the mechanical properties of the cathode, processing and dispersion properties, etc., and then affect the discharge cycle performance of the material, the charge and discharge capacity of the battery, and the discharge energy decays quickly

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