Manganese-based oxide positive electrode material modified by ion conductor layer and its preparation and application

An ion conductor layer, manganese-based oxide 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: 2021-09-17
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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  • Manganese-based oxide positive electrode material modified by ion conductor layer and its preparation and application
  • Manganese-based oxide positive electrode material modified by ion conductor layer and its preparation and application
  • Manganese-based oxide positive electrode material modified by ion conductor layer and its preparation and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) 1g LiNi 0.5 Mn 1.5 O 4 (Solid-phase synthesis) The material was dispersed in 80 mL of ethanol, ultrasonically dispersed for 0.5 h, 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 The sol was added to Suspension A, and then 10mL of 0.137mol / L citric acid aqueous solution and 10mL of 0.1mol / L lithium hydroxide aqueous solution were added dropwise at 0.02mL / min and vigorously stirred at a stirring speed of 800rpm. During the dropwise addition, 2.5wt % ammonia solution to adjust the pH of the reaction system to 8.5, and stir for 4h;

[0050] (3) Evaporate to dryness with stirring at 80°C, and calcinate at 500°C for 5 hours to obtain LiNi 0.5 Mn 1.5 O 4 @3wt.%Li 4 SiO 4

[0051] (4) Phase analysis: X-ray diffraction spectrum analysis of the prepared material shows that the obtained material has a spinel structure, belongs to the Fd-3m crystal form, and has a high degree of crystallinity. ...

Embodiment 2

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

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

[0058] (3) The product was centrifuged, washed, dried overnight, mixed with an excess of 10% lithium acetate, and calcined.

[0059] (4) Phase analysis and morphological characterization: attached Figure 5 The X-ray diffraction spectrum of the obtained material shows that 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). Investigate the microstructure of the material (attached Image 6 ), the particle size of the material is 2-3 μm and the surface of the ma...

Embodiment 3

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

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

[0065] (3) After stirring and evaporating the reaction solution to dryness, heat treatment: 500°C for 3h to obtain 0.88LiNi 0.4 Cr 0.2 Mn 1.4 O 4 ·0.07Li 4 SiO 4 ·0.05Li 5 AlO 4 Material.

[0066] (4) Phase analysis and morphological characterization: X-ray diffraction spectrum shows that the obtained material has a spinel structure and belongs to the Fd-3m c...

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Abstract

The present invention relates to a manganese-based oxide positive electrode material modified by an ion conductor layer and its preparation and application. The positive electrode material is a composite oxide having a layer of ion conductor material coated on the surface of a bulk phase material, and the expression is (1- w 1 -w 2 )Li‑Mn‑O·w 1 Li 4 SiO 4 ·w 2 Li 5 AlO 4 , where the bulk material Li‑Mn‑O can be Li with a spinel structure 1+x Ni y m z mn 2‑y‑z o 4‑Δ material, or aLi with a layered structure 2 MnO 3 ·(1‑a)LiM’ s R 1‑ s o 2 material, or a composite material composed of two types of materials, the ion conductor layer is w 1 Li 4 SiO 4 ·w 2 Li 5 AlO 4 composition. The cathode material of the invention has high energy density, excellent cycle stability and 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 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 problems of energy and environment and the requirement of lightweight electronic products, lithium-ion batteries, as secondary batteries with the highest energy density and power density, are gradually applied in electric vehicles, aerospace, satellite 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 Patents(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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