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A kind of preparation method of nano spinel lithium nickel manganese oxide

A nano-spinel, lithium nickel manganate technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc. Advanced problems, to achieve the effect of uniform micro-mixing, good dispersion and uniform particles

Active Publication Date: 2019-04-30
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the spinel nickel manganese acid file material prepared by the method has a nanoscale size, its microscopic appearance is flake and the crystallinity is not high, so it is difficult to directly apply it to the preparation of spinel lithium nickel manganese oxide

Method used

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  • A kind of preparation method of nano spinel lithium nickel manganese oxide
  • A kind of preparation method of nano spinel lithium nickel manganese oxide
  • A kind of preparation method of nano spinel lithium nickel manganese oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of nano spinel lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ) preparation method, comprising the following steps:

[0038] The first step is to prepare the precursor, specifically:

[0039]Lithium salt, nickel salt and manganese salt are dissolved in distilled water and configured to form a mixed solution with a total cation concentration of 0.24mol / L; In the liquid storage tank of the gravity rotating bed reactor, run the supergravity reactor, adjust the rotation speed of the rotating bed rotor to 1000r / min through the frequency converter, and turn on the centrifugal pump at the same time to make the mixed solution circulate in the supergravity device and pass through the rotameter Control flow rate is 400L / h, circulation 10min); Add ammonium carbonate solution as precipitating agent (the concentration of ammonium ion in the ammonium carbonate solution is the total cation concentration of mixed solution, and the rate of addition is 100ml per minute), c...

Embodiment 2- Embodiment 3

[0045] Embodiment 2-Example 3 differs from Example 1 in that the proportioning ratio of the lithium nitrate, nickel nitrate and manganese nitrate is different, specifically: the lithium nitrate, nickel nitrate and manganese nitrate described in the embodiment 2 are based on lithium ion : nickel ion: the mol ratio of manganese ion is 1.05:0.5:1.5 proportioning is carried out batching; Lithium nitrate, nickel nitrate and manganese nitrate are by lithium ion described in embodiment 3: nickel ion: the mol ratio of manganese ion is 1.1: The ratio of 0.5:1.5 is used for batching.

[0046] Embodiment 2 and embodiment 3 gained nano spinel type LiNi 0.5 mn 1.5 o 4 The XRD test results are detailed in Figure 4 ,Depend on Figure 4 It can be seen that the proportioning of lithium nitrate, nickel nitrate and manganese nitrate is more important, and the spinel LiNi prepared according to the proportioning of embodiment 2 and embodiment 3 0.5 mn 1.5 o 4 There is a small amount of nic...

Embodiment 4- Embodiment 5

[0048] The difference between embodiment 4-embodiment 5 and embodiment 1 is that the pH value of described system is different, and concrete example 4 is to use ammoniacal liquor (NH 3 h 2 O) adjust the pH value of the reaction system to 7.5. In embodiment 5, use ammoniacal liquor (NH 3 h 2 O) adjust the pH value of the reaction system to 8.5. Other operating conditions are the same.

[0049] Embodiment 4 and embodiment 5 gained nano spinel type LiNi 0.5 mn 1.5 o 4 The XRD test results are detailed in Figure 5 ,from Figure 5 It can be seen that when the pH value is adjusted to 8, the prepared sample has high crystallinity and no impurities are produced.

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Abstract

The invention provides a method for preparing nanometer spinel lithium nickel manganese oxide. The method includes steps of uniformly mixing manganese salt, lithium salt and nickel salt with one another to obtain mother liquor with the total cation concentration of 0.1-1.0 mol / L, carrying out liquid-liquid co-precipitation reaction on the mother liquor to prepare nanometer precursors and adding the nanometer precursors into ammonium carbonate solution under the condition that the rotational speeds of rotors of a high-gravity reactor are 400-2200 rpm; continuously recycling mixed liquor under the effects of high-gravity fields until reaction is completely carried out to obtain suspension; filtering the suspension and then drying to obtain precursors; calcining the precursors in a microwave muffle furnace to obtain the nanometer spinel lithium nickel manganese oxide. The method has the advantages that the spinel lithium nickel manganese oxide which is high in crystallinity, complete in crystal form and good in dispersibility, contains uniform particles and has controllable particle sizes can be prepared by the aid of the method, and the average particle sizes of the spinel lithium nickel manganese oxide can reach 50-100 nm; the method includes simple processes, is low in cost and good in batch production stability and is environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery materials, in particular to a nano-spinel lithium nickel manganese oxide LiNi 0.5 mn 1.5 o 4 method of preparation. Background technique [0002] Among many positive electrode materials for lithium-ion batteries, the spinel-type lithium nickel manganese oxide material can fully meet the needs of green new kinetic energy due to its high voltage of 4.7V and good cycle performance, such as: spinel Compared with lithium cobalt oxide materials, lithium nickel manganese oxide materials have lower production costs and less environmental pollution; compared with lithium manganese oxide materials, spinel lithium nickel manganese oxide materials have higher stability under high temperature cycles. Good; compared with lithium iron phosphate materials, the spinel-type lithium nickel manganese oxide material has a simple synthesis process and good stability in mass production, esp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 周继承隗小山张祖喜
Owner XIANGTAN UNIV
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