Sodium-ion battery positive electrode material with multi-core type core-shell structure and preparation method of sodium-ion battery positive electrode material

A sodium-ion battery, core-shell structure technology, applied in battery electrodes, structural parts, circuits, etc., can solve problems such as non-uniformity of performance indicators, failure to meet expectations, etc., to improve cycle performance, reduce the possibility of collapse, Reduce the effect of deformation

Pending Publication Date: 2022-04-15
ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that the various positive electrode materials coated on the pole piece are independent and only macroscopically mixed, which may lead to the inhomogeneity of various performance indicators, which may not meet expectations.

Method used

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  • Sodium-ion battery positive electrode material with multi-core type core-shell structure and preparation method of sodium-ion battery positive electrode material
  • Sodium-ion battery positive electrode material with multi-core type core-shell structure and preparation method of sodium-ion battery positive electrode material
  • Sodium-ion battery positive electrode material with multi-core type core-shell structure and preparation method of sodium-ion battery positive electrode material

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preparation example Construction

[0033] Such as figure 2 Shown, the present invention also provides a kind of preparation method of the sodium ion battery cathode material of described polynuclear core-shell structure, and it comprises the steps:

[0034] STEP101: Provide at least two kinds of nano-scale particle materials and binders for preparing the inner core 111 respectively, and fully stir and mix the nano-scale particle materials and the binder at a certain stoichiometric ratio to form a mixture, the nano-scale The granular material is one or more of layered structure materials, tunnel structure materials, polyanionic compounds, and macroframe compound materials;

[0035] STEP102: After the obtained mixture is spray-dried, nanoparticles formed of different materials are physically bonded together to form a core 11 composed of multiple inner cores 111;

[0036] STEP103: Provide the shell material for preparing the shell 12, and dissolve the shell material in a solvent to form a shell solution, stir we...

Embodiment 1

[0047] NaCu 0.4 Fe 0.3 mn 0.3 o 2 Sodium iron phosphate NaFePO with olivine structure 4 The nano-scale materials are fully mixed according to the stoichiometric ratio of 1:0.1. After spray drying and nucleation, they are dispersed in an ethanol solution containing aluminum isopropoxide with a concentration of 2.5wt.%. After continuous stirring for 3 hours, filter , washing and drying, calcining the obtained mixture at 400° C. for 8 hours in an argon atmosphere, and cooling to obtain a positive electrode material.

[0048] The electrochemical performance test of the material is tested at 25°C with the blue battery test system, and the test voltage range is 2.5V to 4.2V; the specific capacity test conditions: 0.1C charge and discharge once; 0.2C charge and discharge once; 0.2C charge, 1C discharge once, such as image 3 Shown; cycle performance test conditions: charge and discharge at a rate of 1C, cycle for 500 cycles, and investigate the capacity retention rate. The spec...

Embodiment 2

[0050] NaCu 0.4 Fe 0.3 mn 0.3 o 2 Polyanionic compounds with framework structure Na 3 V 2 (PO 4 ) 3The nano-scale materials are fully mixed according to the stoichiometric ratio of 1:0.2. After spray drying and nucleation, they are dispersed in an aluminum isopropoxide ethanol solution with a concentration of 5wt.%. After continuous stirring for 3 hours, filter, After washing and drying, the obtained mixture was calcined at 650° C. for 6 hours in an argon atmosphere, and then cooled to obtain a positive electrode material.

[0051] The electrochemical performance test of the material is tested at 25°C with the blue battery test system, and the test voltage range is 2.5V to 4.2V; the specific capacity test conditions: 0.1C charge and discharge once; 0.2C charge and discharge once; 0.2C charge, Discharge once at 1C; cycle performance test conditions: charge and discharge at a rate of 1C, cycle 500 cycles, and investigate the capacity retention rate. The specific discharg...

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Abstract

The invention relates to a sodium ion battery positive electrode material with a multi-core type core-shell structure and a preparation method thereof, the sodium ion battery positive electrode material with the multi-core type core-shell structure comprises a plurality of particles, and each particle comprises a core and a shell wrapping the outer side of the core. The core is composed of a plurality of inner cores, and a gap exists between any two adjacent inner cores in the plurality of inner cores. The plurality of inner cores are made of two or more than two nanoscale particle materials with the same or different structures. The nanoscale particle material is one or more of a layered structure material, a tunnel structure material, a polyanion compound and a large-frame compound material. According to the sodium ion battery positive electrode material, advantages of the structure and the performance can be complemented on the nanoscale level, defects can be made up, and the due advantages of the sodium ion battery positive electrode material can be better exerted compared with simple mixed use and smearing of the sodium ion battery positive electrode material on a pole piece. The invention also provides a preparation method of the sodium ion battery positive electrode material.

Description

technical field [0001] The invention belongs to the field of sodium ion batteries, in particular to a sodium ion battery cathode material with a multi-nuclear core-shell structure and a preparation method. Background technique [0002] At present, lithium-ion batteries are widely used in mobile phones, cameras, notebook computers, power tools, electric bicycles and electric vehicles because of their advantages such as high specific capacity, high voltage, and good safety performance. However, the ever-growing lithium-ion battery market will inevitably bring about the shortage of lithium resources and rising lithium prices, while the sodium-ion battery system is rich in resources, low in price, environmentally friendly, and has similar electrochemical properties to lithium-ion batteries. In recent years, it has received extensive attention, thus providing a new option for electrochemical energy storage. However, sodium ions have a large ionic radius and slow kinetic rate, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/36H01M4/366Y02E60/10
Inventor 杨张萍韩珽陈英
Owner ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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