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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 anode materials with special morphology and adjustable size for lithium-ion batteries and is cost-effective. A synthetic method characterized by low cost, universality and easy control of reaction conditions

Method used

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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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Effect test

Embodiment 1

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

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

[0048] (3) through inductively coupled plasma emission spectrometer (ICP), the nickel and manganese molar ratio in the nickel-manganese oxide is 5.5:1, and the nickel-manganese oxide and excessive 10% LiAc·2H 2 O (the molar ratio of Ni+Mn to Li is 2:1) is disper...

Embodiment 2

[0054] The preparation process of Example 1 is adopted, except that the coordination regulator PVP is added to the solution B. LiNi prepared by X-ray diffraction 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 fabrication method as in Example 1, the material exhibits excellent electrochemical performance.

Embodiment 3

[0056] (1) 4mmol Ni(Ac) 2 4H 2 O and 12mmol Mn(Ac) 2 2H 2 O was dissolved in 100mL ethanol to make solution A; 16mmol terephthalic acid and 36mmol NaOH were dissolved in 50mL water to make solution B; under stirring condition, solution A was slowly added dropwise to solution B, stirred at room temperature for 12h, and aged 48h;

[0057] (2) After centrifugation, washing, and drying, a khaki-yellow precursor is obtained, and the scanning electron microscope photo is as attached Figure 6 As shown, the obtained nickel-manganese-organic ligand polymer precursor has a multi-level structure, and the primary structure is irregular flakes of 200nm*300nm, and these flakes are agglomerated to form spherical particles of 3-5m. The precursor was calcined in an air atmosphere at 600° C. for 3 h to obtain nickel manganese oxide.

[0058](3) through the inductively coupled plasma emission spectrometer (ICP), the nickel and manganese molar ratio in the nickel-manganese oxide is 3:1, and...

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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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