Preparation method of sodium ion battery positive electrode material with coating structure

Abstract

The invention discloses a preparation method of a sodium ion battery positive electrode material with a coating structure, wherein the preparation method is characterized by comprising the steps: dissolving or dispersing a metal source into a volatile solvent to prepare a solution / suspension, adding the sodium ion battery positive electrode material or a positive electrode material precursor, anduniformly mixing, and drying and calcining to decompose the metal source into active oxide to coat the surface of the sodium ion battery positive electrode material or the positive electrode materialprecursor. A vanadium source precursor is dispersed and suspended in the medium, the active oxide is coated in the process of synthesizing the sodium ion positive electrode material, and a coating layer is uniformly distributed on the surface of the positive electrode material and is tightly combined, so that the cycling stability of the sodium ion battery positive electrode material is improved;and the surface nano-layer active oxide has good stability to CO2 / H2O and an electrolyte in the air, so the air storage stability and the charge-discharge cycle life of the positive electrode materialare effectively improved, the method is simple, the cost is low, and the positive electrode material can be used for large-scale production.

Description

technical field [0001] The present invention relates to a kind of active oxide V 2 o 5 The invention discloses a method for preparing a positive electrode material of a coated sodium ion battery, belonging to the technical field of sodium ion battery materials. Background technique [0002] Sodium-ion batteries have become a research and development hotspot of battery technology in recent years due to their abundant raw materials, low cost and high safety. Potential application scenarios of sodium-ion batteries include low-speed electric vehicles and energy storage devices. Cathode material is one of the key materials for sodium-ion batteries, among which layered transition metal oxides have a high specific capacity and many similarities with the cathode materials of relatively mature lithium batteries currently on the market in terms of synthesis and battery manufacturing. It is one of the materials that have the potential to be commercially produced as anode materials f...

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Problems solved by technology

[0003] However, the layered structure transition metal oxides have disadvantages such as poor storage stability in air and / or unstable crystal structure in the charged electrolyte, and the capacity decay is serious in long-cycle and high-current charge-discharge, that is, the cycle performance and rate performance cannot be achieved. Fully meet the requirements of the application, while the poor storage stability in the air makes the material must be stored and used under strict conditions

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