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Ion conductor layer modified manganese-based oxide positive electrode material, preparation method and applications thereof

A manganese-based oxide, ion conductor layer technology, applied in the field of energy storage, can solve the problems of unfavorable electrode material rate performance, extremely poor electronic conductivity, improvement and other problems, and achieve fast transmission, high energy density, and simple process. Effect

Active Publication Date: 2018-06-05
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

Fluoride and phosphate can resist the erosion of HF, but their extremely poor electronic conductivity is not conducive to the improvement of the rate performance of electrode materials

Method used

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  • Ion conductor layer modified manganese-based oxide positive electrode material, preparation method and applications thereof
  • Ion conductor layer modified manganese-based oxide positive electrode material, preparation method and applications thereof
  • Ion conductor layer modified manganese-based oxide positive electrode material, preparation method and applications thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) 1g LiNi 0.5 mn 1.5 o 4 (Synthesis by solid-phase method) The material was dispersed in 80mL of ethanol, ultrasonically dispersed for 0.5h, made into suspension A, and placed in a 60°C water bath;

[0049] (2) Take 100mL 6.2*10 -3 mol / L ethanol dispersed SiO 2 Add the sol into the suspension A, then add 10mL 0.137mol / L citric acid aqueous solution and 10mL 0.1mol / L lithium hydroxide aqueous solution dropwise at 0.02mL / min and stir vigorously at a stirring speed of 800rpm. During the dropping process, use 2.5wt .% ammonia solution to adjust the pH of the reaction system to 8.5, and stir for 4 hours;

[0050] (3) Stir and evaporate to dryness at 80°C, and roast at 500°C for 5h to obtain LiNi 0.5 mn 1.5 o 4 @3wt.%Li 4 SiO 4

[0051] (4) Phase analysis: X-ray diffraction spectrum analysis was performed on the prepared material, which showed that the obtained material had a spinel structure, belonged to the Fd-3m crystal form, and had a high degree of crystallin...

Embodiment 2

[0056] (1) 1g Ni 0.5 mn 1.5 o x (Preparation by solid-phase method) The material is dispersed in 100mL alcohol-water mixed solution (the volume ratio of ethanol to water is 7:1), and ultrasonically dispersed into suspension A;

[0057] (2) Add 20mL of 2.5mol / L sodium silicate solution dropwise to A at 85°C at 10mL / min, adjust the pH of the reaction system to 10 with 2.5wt.% ammonia solution, and stir for 3h;

[0058] (3) The product is centrifuged, washed, dried overnight, then mixed with an excess of 10% lithium acetate, and calcined. The calcining program is 500°C for 5h+900°C for 12h+700°C for 12h.

[0059] (4) Phase analysis and morphology characterization: attached Figure 5 The X-ray diffraction spectrum of the obtained material has a spinel structure, belongs to the Fd-3m crystal form, and contains a small amount of impurity Li x Ni 1-x O(x~0.2). The microscopic morphology of the material was investigated (attached Figure 6 ), the particle size of the material i...

Embodiment 3

[0063] (1) 0.5g LiNi synthesized by liquid phase co-precipitation 0.4 Cr 0.2 mn 1.4 o 4 The material was ultrasonically dispersed in 40mL of deionized water, and 20mL of an aqueous solution containing 0.05g of polyetherimide was added and stirred for 2h, called suspension A;

[0064] (2) Add an appropriate amount of lithium acetate solid particles and stir to dissolve, add 0.03mol / L tetraethyl silicate and aluminum nitrate solution dropwise to A at 20mL / min at 80°C, and use hydrochloric acid and ammonia solution to control the reaction system Keep the pH~4.0 for 2h, and the stirring speed is 2000rpm;

[0065] (3) After the reaction solution was stirred and evaporated to dryness, it was heat treated at 500°C for 3 hours to obtain 0.88LiNi 0.4 Cr 0.2 mn 1.4 o 4 0.07 Li 4 SiO 4 0.05 Li 5 AlO 4 Material.

[0066] (4) Phase analysis and morphology characterization: X-ray diffraction spectrum shows that the obtained material has a spinel structure, which belongs to the F...

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Abstract

The invention relates to an ion conductor layer modified manganese-based oxide positive electrode material, a preparation method and applications thereof, wherein the ion conductor layer modified manganese-based oxide positive electrode material is a composite oxide with a bulk phase material coated with a layer of an ion conductor material on the surface, the expression formula is (1-w1-w2)Li-Mn-O.w1Li4SiO4.w2Li5AlO4, the bulk phase material Li-Mn-O can be a Li1+xNiyMzMn2-y-zO4-delta material having a spinel structure, or a aLi2MnO3.(1-a)LiM'sR1-sO2 material having a layered structure, or a composite material formed by the two materials, and the ion conductor layer comprises w1Li4SiO4.w2Li5AlO4. According to the present invention, the ion conductor layer modified manganese-based oxide positive electrode material has advantages of high energy density, excellent cycle stability and excellent rate performance.

Description

technical field [0001] The invention belongs to the field of energy storage, and in particular relates to a manganese-based oxide positive electrode material modified by an ion conductor layer and its preparation and application. Background technique [0002] Since its commercialization in 1990, lithium-ion batteries have been widely used in portable electronic devices such as notebook computers, mobile phones, and digital cameras. In recent years, with the increasing energy and environmental issues and the requirements for lightweight electronic products, lithium-ion batteries, as secondary batteries with the highest energy density and power density, are gradually used in electric vehicles, aerospace, satellites and other fields . However, the current commercial lithium-ion batteries still cannot meet the high energy density requirements of electric vehicles. The development of lithium-ion batteries with higher specific energy and longer life is the key to the development...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/0525H01G11/46H01G11/86
CPCH01G11/46H01G11/86H01M4/366H01M4/505H01M4/62H01M10/0525Y02E60/10
Inventor 陈剑杨时峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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