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Method for manufacturing anode materials for sodium ion batteries and application of anode materials

A sodium-ion battery and cathode material technology, applied in the field of electrochemical power sources and energy materials, can solve the problems of phase change structure, collapse, poor cycle stability, etc., and achieve the advantages of easy availability of raw materials, high average discharge voltage, and high cycle specific capacity Effect

Inactive Publication Date: 2015-09-23
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, such materials are prone to phase transition and even structural collapse during the process of sodium ion intercalation and deintercalation, resulting in poor cycle stability of such materials during charge and discharge.

Method used

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  • Method for manufacturing anode materials for sodium ion batteries and application of anode materials
  • Method for manufacturing anode materials for sodium ion batteries and application of anode materials
  • Method for manufacturing anode materials for sodium ion batteries and application of anode materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Preparation of 5% Mg-doped Na 2 / 3 mn 1-x-y Ni y Mg x o 2 (x=0.05, y=0.28) positive electrode material

[0036] Accurately weigh the corresponding proportion of NaNO 3 , Mn(NO 3 ) 2 , Ni(NO 3 ) 2 ·6H 2 O, Mg(NO 3 ) 2 ·6H 2 O was dissolved in distilled water and stirred. Add the chelating agent citric acid solution dropwise and stir to obtain a gel. Dry and heat-treat the precursor at 120°C. Grind and calcined at 900°C for 15h-24h to obtain black powder. The size of the obtained powder particles is 1-2μm, and the density is 5.1g / cm 3 .

[0037] (2) Preparation of 5% Mg-doped Na 2 / 3 mn 1-x-y Ni y Mg x o 2 Composite cathode

[0038] Mix the positive electrode material prepared above with Super P and the binder polyvinylidene fluoride at a mass ratio of 0.75:0.15:0.10, add the solvent N-methylpyrrolidone, and obtain the Composite positive electrode.

[0039] (3) Assembling sodium-ion batteries

[0040] The composite positive electrode prepared a...

Embodiment 2

[0044] (1) Preparation of 5% Li-doped Na 2 / 3 mn 1-x-y Ni y Li x o 2 (x=0.05, y=0.3) positive electrode material

[0045] Accurately weigh the corresponding proportion of NaNO 3 , Mn(NO 3 ) 2 , Ni(NO 3 ) 2 ·6H 2 O, LiNO 3 Dissolve in distilled water and stir. Add the chelating agent citric acid solution dropwise and stir to obtain a gel. Dry and heat-treat the precursor at 120°C. Grind and calcined at 900°C for 15h-24h to obtain black powder. The size of the powder particles is 2-3μm and the density is 4.9g / cm 3 .

[0046] (2) Preparation of 5% Li-doped Na 2 / 3 mn 1-x-y Ni y Li x o 2 Composite cathode

[0047] Mix the positive electrode material prepared above with Super P and the binder polyvinylidene fluoride at a mass ratio of 0.75:0.15:0.10, add the solvent N-methylpyrrolidone, and obtain the Composite positive electrode.

[0048] (3) Assembling sodium-ion batteries

[0049] The composite positive electrode prepared above is assembled with the sodium ...

Embodiment 3

[0053] Preparation of 0.5% Al-doped Na 2 / 3 mn 1-x-y Ni y al x o 2 (x=0.005, y=0.1) positive electrode material, the size of the obtained powder particles is 1.5-3μm, and the density is 5.0g / cm 3 . All the other are identical with embodiment 1.

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Abstract

The invention discloses a method for manufacturing anode materials for sodium ion batteries and application of the anode materials. Different types of metal are doped in each anode material. The anode materials can be expressed as Na<2 / 3>A<1-x>B<x>O<2>. The A represents selected transition metal with electrochemical activity, the B represents the doped metal, and the content x of the B is higher than 0 and is lower than or equal to 0.20. The method includes mixing materials at earlier stages; drying the materials and carrying out heat treatment on the materials; compressing the materials to obtain sheets; calcining the sheets at high temperatures to obtain the metal-doped anode materials for the sodium ion batteries. The method and the application have the advantages that the anode materials for the sodium ion batteries have high discharge voltages and are high in circulation capacity and excellent in stable circulation, accordingly, the specific capacity and the energy density of the batteries can be greatly improved when the anode materials are used as anodes of the sodium ion batteries, and the anode materials have excellent application prospects.

Description

technical field [0001] The invention belongs to the field of electrochemical power supply and also belongs to the technical field of energy materials. In particular, it relates to a preparation method of a kind of anode material of a sodium ion battery doped with different metals, and the application of a new type of sodium ion battery using the cathode in an energy storage device. Background technique [0002] Compared with lithium resources in lithium-ion batteries, sodium resources have the natural advantages of being widely distributed (the abundance in the earth's crust is 2.3-2.8%, about 12,500 times that of lithium elements), and low prices, so sodium-ion batteries are more potential for sustainable development. However, the capacity of the currently reported cathode materials for sodium-ion batteries is much lower than that of the anode, so improving the performance of cathode materials has become the key to increasing the energy density of sodium-ion batteries. ...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/50H01M4/48H01M10/36
CPCH01M4/48H01M4/505H01M4/525H01M10/36Y02E60/10
Inventor 郭玉国王鹏飞殷雅侠
Owner INST OF CHEM CHINESE ACAD OF SCI
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