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Complex-phase sodium storage positive electrode material as well as preparation method and application thereof

A cathode material and layered technology, applied in the field of composite cathode materials and their preparation, can solve the problems of unsatisfactory stability, low capacity and high phase capacity, improve structural stability and cycle performance, reduce reaction temperature, improve The effect of capacity

Pending Publication Date: 2021-12-24
浙江宇钠科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the properties of layered materials with different crystalline phases have their own advantages and disadvantages. For example, the P2 phase has good cycle stability but low capacity, and the O3 phase has high capacity but not ideal stability.
Therefore, it is still a major challenge to develop layered cathodes with excellent comprehensive performance.

Method used

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  • Complex-phase sodium storage positive electrode material as well as preparation method and application thereof
  • Complex-phase sodium storage positive electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Press Na[Li 0.05 (Ni 0.25 Fe 0.25 mn 0.5 ) 0.95 ]O 2 Stoichiometric ratio, weighed Na 2 CO 3 , Li 2 CO 3 , NiO, Fe 2 o 3 , Mn 2 o 3 Mix evenly by ball milling, press into tablets at 1MPa; then pre-fire at 400°C in air atmosphere for 3 hours, cool to room temperature and then grind and pulverize; then press at 1MPa, and then bake at 850°C in air atmosphere for 15 hours , and then naturally cooled to room temperature. The product is analyzed by XRD and has P2 and O3 composite phases, see figure 1 . The material prepared in this embodiment is used as the positive electrode, the sodium metal is used as the negative electrode, the glass fiber is used as the separator, and NaPF 6 The propylene carbonate (PC) / ethyl methyl carbonate (EMC) solution is the electrolyte, and the fluorinated ethylene carbonate (FEC) that the weight of the above electrolyte is 3% is added, the button battery is assembled, and the charge and discharge test is carried out. The current de...

Embodiment 2

[0040] Press Na[Li 0.03(Ni 0.20 Fe 0.35 mn 0.45 ) 0.97 ]O 2 Stoichiometric ratio, weighed Na 2 CO 3 , Li 2 CO 3 , NiO, Fe 2 o 3 , Mn 2 o 3 Mix evenly by ball milling, press into tablets at 1MPa; then pre-calcine in air at 400°C for 3 hours, cool down to room temperature, grind and pulverize, then press at 1MPa; then bake in air at 830°C for 15 hours , and then naturally cooled to room temperature. According to XRD analysis, the product has a composite phase of P2 and O3. The above product was electrochemically tested according to the method of Example 1, and the initial discharge capacity of the product could reach 143mAh / g.

Embodiment 3

[0042] Press Na[Li 0.04 (Ni 0.35 Fe 0.25 mn 0.4 ) 0.96 ]O 2 The stoichiometric ratio, weighed Na 2 CO 3 , Li 2 CO 3 , NiO, Fe 2 o 3 , Mn 2 o 3 Mix evenly through ball milling, press into tablets at 1MPa; then pre-calcine in air at 400°C for 3 hours, cool to room temperature, grind and pulverize, then press at 1MPa; then bake in air at 860°C for 15 hours , and then naturally cooled to room temperature. According to XRD analysis, the product has a composite phase of P2 and O3. The above product was electrochemically tested according to the method of Example 1, and the initial discharge capacity of the product could reach 140mAh / g.

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Abstract

The invention discloses a complex-phase layered positive electrode material Nan [Liz (Ni < 1-x-y > Mn < x > Fe < y >) < 1-z >] O2. The complex-phase layered positive electrode material consists of a high-capacity O3 phase and a high-cycle-stability P2 phase. In the solid-phase reaction, the formation of the complex-phase positive electrode material is realized by regulating and controlling components, introducing lithium doping and optimizing the reaction temperature. The preparation method is simple and controllable in process, low in energy consumption, low in cost and suitable for large-scale industrial production. The result shows that the prepared multiphase positive electrode material has high capacity and can be applied to the field of sodium ion batteries.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for sodium ion batteries, and relates to a composite positive electrode material and a preparation method and application thereof. Background technique [0002] With the increasingly serious energy and environmental problems around the world, the development of sustainable clean energy, such as solar energy and wind energy, has received increasing attention. However, this type of clean energy changes with changes in weather, climate, and environmental conditions, and requires supporting energy storage batteries. , in order to improve its utilization efficiency, therefore, the clean energy plus energy storage model is the direction of new energy development. At present, common energy storage batteries include sodium-sulfur batteries, sodium-nickel chloride batteries, lithium-ion batteries, lead-acid batteries, lead-carbon batteries, and flow batteries. However, this type of en...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/04H01M10/054C01G53/00
CPCH01M4/366H01M4/505H01M4/525H01M4/0471H01M10/054C01G53/50H01M2004/028C01P2002/72C01P2006/40Y02E60/10
Inventor 郭国庆洪国林石顺风李堃谢健
Owner 浙江宇钠科技有限公司
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