Lithium transitional metal oxide and preparation method and application thereof

A technology of transition metals and oxides, applied in electrical components, battery electrodes, circuits, etc., to achieve the effect of simple operation, strong universality, and improved electrochemical performance

Inactive Publication Date: 2017-06-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, although the coordination polymer method has made great progress in the preparation of high-performance lithium-ion electrode materials in recent years, there is no one that can synthesize

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  • Lithium transitional metal oxide and preparation method and application thereof
  • Lithium transitional metal oxide and preparation method and application thereof
  • Lithium transitional metal oxide and preparation method and application thereof

Examples

Experimental program
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Example Embodiment

[0045] Example 1

[0046] (1) Add 4mmol Ni(Ac) 2 ·4H 2 O and 12mmol Mn(Ac) 2 ·2H 2 O was dissolved in 100 mL water to form solution A; 16 mmol terephthalic acid and 36 mmol NaOH were dissolved in 50 mL water to form solution B; solution A was slowly added dropwise to solution B under stirring, and stirred at room temperature for 8 hours. 化12h;

[0047] (2) After centrifugation, washing, and drying, the ocher precursor is obtained. Under the scanning electron microscope, as attached figure 1 The nickel-manganese-organic ligand polymer has a micron-scale long flake morphology, the flake width is about 2 to 4 um, and the length is 6 to 8 m. The precursor is calcined in an air atmosphere at 450°C for 5 hours to obtain nickel manganese oxide.

[0048] (3) The molar ratio of nickel to manganese in nickel-manganese oxide measured by inductively coupled plasma emission spectrometer (ICP) is 5.5:1. The nickel-manganese oxide and 10% excess LiAc·2H 2 O (measurement ratio, Ni+Mn to Li molar ra...

Example Embodiment

[0053] Example 2

[0054] The preparation process of Example 1 was adopted, except that the coordination regulator PVP was added to Solution B. LiNi prepared by X-ray diffraction spectrum 0.4 Mn 1.6 O 3.98 It has a spinel structure and a nanosheet morphology of 300nm*60nm. Using the same pole piece manufacturing method as in Example 1, the material exhibits excellent electrochemical performance.

Example Embodiment

[0055] Example 3

[0056] (1) Add 4mmol Ni(Ac) 2 ·4H 2 O and 12mmol Mn(Ac) 2 ·2H 2 O was dissolved in 100 mL ethanol to form solution A; 16 mmol terephthalic acid and 36 mmol NaOH were dissolved in 50 mL water to form solution B; solution A was slowly added dropwise to solution B under stirring, and stirred at room temperature for 12 hours. 化8h;

[0057] (2) After centrifugation, washing and drying, the khaki precursor is obtained. The SEM photo is attached Image 6 As shown, the obtained nickel manganese-organic ligand polymer precursor has a hierarchical structure, and the primary structure is irregular flakes of 200 nm*300 nm, and these flakes agglomerate to form spherical particles of 3 to 5 m. The precursor was fired in an air atmosphere at 600°C for 3 hours to obtain nickel manganese oxide.

[0058] (3) The molar ratio of nickel to manganese in nickel-manganese oxide is 3:1 measured by inductively coupled plasma emission spectrometer (ICP), and the nickel-manganese oxide is mix...

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Abstract

The invention discloses a lithium transitional metal oxide and a preparation method and an application thereof. The lithium transitional metal oxide is a Li<1+x>Ni<y>M<z>Mn<2-y-z>O<4-delta> material with a spinel structure, or aLi<2>M'O<3>.(1-a)LiM''<s>R<1-s>O<2> material with a layered structure, wherein x is greater than or equal to -0.1 and less than or equal to 0.2; y is greater than or equal to 0 and less than or equal to 0.6; z is greater than or equal to 0 and less than or equal to 1.25; y+z is greater than or equal to 0 and less than or equal to 1.25; <delta> is greater than or equal to 0 and less than or equal to 0.05; a is greater than or equal to 0 and less than 1; and s is greater than or equal to 0.8 and less than or equal to 1. According to the preparation method, a metal-organic coordination polymer precursor method is adopted; organic complex is terephthalic acid and derivatives thereof; and the metal-organic coordination polymer is subjected to heat treatment and high-temperature calcining to obtain the lithium transitional metal oxide. The synthetic method is simple in process and the cost is low, so that large-scale production of the positive electrode material of the lithium transitional metal oxide can be carried out favorably; and in addition, the prepared lithium transitional metal oxide has high crystal form, adjustable grain diameter from nanometer to micron, special appearance and specific crystal surface orientation, and excellent electrochemical performance when the lithium transitional metal oxide is used as the positive electrode material of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of preparation of energy materials and lithium ion batteries, and in particular relates to a method for preparing lithium transition metal oxides by using terephthalic acid and derivatives thereof. Background technique [0002] In recent years, with the increasing energy and environmental issues and the requirement of lightweight electronic products, as the secondary battery with the highest energy density and power density, lithium-ion battery has become the preferred technology to solve contemporary environmental and energy problems. In recent years, lithium-ion batteries have made great progress in the field of high-energy batteries, but there is still a gap in the application of electric vehicles (EV), hybrid electric vehicles (HEV) and other fields. The key issue is to research and develop new high-energy density electrodes. Material. [0003] The electrode materials of lithium-ion batteries, especiall...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 陈剑杨时峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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