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Nonmetal doped positive electrode and preparation method thereof, and secondary doped positive electrode and preparation method thereof

A secondary doping, non-metallic technology, applied in the field of electrochemistry, can solve problems such as structural instability, and achieve the effect of simple preparation method, improved performance, and increased specific capacity

Active Publication Date: 2020-08-21
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above problems, the present invention provides a non-metallic doped positive electrode, a secondary doped positive electrode and a preparation method. The problem of stability, through the layered oxide positive electrode and its preparation method, the rate performance and cycle stability of the battery can be improved

Method used

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  • Nonmetal doped positive electrode and preparation method thereof, and secondary doped positive electrode and preparation method thereof
  • Nonmetal doped positive electrode and preparation method thereof, and secondary doped positive electrode and preparation method thereof
  • Nonmetal doped positive electrode and preparation method thereof, and secondary doped positive electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Preparation of NaLi 1 / 9 Ni 2 / 9 Fe 2 / 9 mn 4 / 9 B 1 / 50 o 2 The positive electrode material, wherein z=0.02, x=1, y=1 / 9, N is B, and TM is Ni, Fe, Mn.

[0047] Using the solid-phase preparation method, according to the molar ratio of the chemical formula, accurately weigh the Na 2 CO 3 , Li 2 CO 3 , Mn 2 o 3 , NiO, Fe 2 o 3 、Na 2 B 4 o 7 Ball milled for 10 hours, pressed into a disc with a diameter of 13mm under a pressure of 15MPa; in an air atmosphere, heated up to 450°C at 5°C / min, then calcined for 2 hours, cooled to room temperature and fully ground, then raised to 5°C / min After calcination at 950° C. for 15 hours, the temperature was then lowered to room temperature at 3° C. / min and cooled to obtain the positive electrode.

Embodiment 2

[0049] Preparation of NaLi 1 / 9 Ni 2 / 9 Fe 2 / 9 mn 4 / 9 P 1 / 50 o 2 The positive electrode material, wherein z=0.02, x=1, y=1 / 9, N is P, and TM is Ni, Fe, Mn.

[0050] Using the solid-phase preparation method, according to the molar ratio of the chemical formula, accurately weigh the Na 2 CO 3 , Li 2 CO 3 , Mn 2 o 3 , NiO, Fe 2 o 3 、Na 3 PO 4 Ball milling for 10 hours; the subsequent preparation method and conditions were the same as in Example 1.

Embodiment 3

[0052] Preparation of NaLi 1 / 9 Ni 2 / 9 Fe 2 / 9 mn 4 / 9 Si 1 / 50 o 2 The positive electrode material, wherein, z=0.02, x=1, y=1 / 9, N is Si, and TM is Ni, Fe, Mn.

[0053] Using the solid-phase preparation method, according to the molar ratio of the chemical formula, accurately weigh the Na 2 CO 3 , Li 2 CO 3 , Mn 2 o 3 , NiO, Fe 2 o 3 , SiO 2 Ball milling for 10 hours; the subsequent preparation method and conditions were the same as in Example 1.

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Abstract

The invention provides a non-metal doped positive electrode and a preparation method thereof, and a secondary doped positive electrode and a preparation method thereof, wherein the chemical formula ofthe non-metal doped positive electrode is NaxLiyTM1-yNzO2, x is greater than 0.5 and less than or equal to 1, y is greater than 0 and less than or equal to 0.5, z is greater than 0 and less than or equal to 0.2, N is a non-metallic element doped into the transition metal layer of the non-metal doped positive electrode and comprises one or more of non-metal elements of a group IIIA, a group IV main group, a group VA or a group VIA, TM is a metal element in the transition metal layer and comprises one or more of transition metal elements in a fourth period and a fifth period, and N is selectedfrom one or more of B, Si, P, As or Se. According to the non-metal doped positive electrode and the preparation method thereof, and the secondary doped positive electrode and the preparation method thereof, the rate performance, the specific capacity and the cycling stability of the positive electrode can be improved.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a non-metal doped positive electrode, a secondary doped positive electrode and a preparation method. Background technique [0002] Over the past few decades, lithium-ion batteries have been widely used in mobile electronic devices due to their higher energy and power densities. However, due to the scarcity of lithium resources and cost considerations, lithium-ion batteries cannot meet the future demands of large-scale energy storage applications. Therefore, sodium resources, which are abundant and widely distributed, have gradually become an alternative energy storage option to meet the rapid development needs of smart grids and clean energy industries. [0003] Among many cathode materials, sodium ion layered oxide cathode materials have the advantages of large specific capacity, good ionic conductivity and simple synthesis method, and have potential application pros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M4/04H01M4/131H01M4/1391H01M10/054
CPCH01M4/0471H01M4/131H01M4/1391H01M4/362H01M4/485H01M4/505H01M4/525H01M4/626H01M4/628H01M10/054H01M2004/028H01M2220/10Y02E60/10
Inventor 郭玉国郭玉洁殷雅侠
Owner INST OF CHEM CHINESE ACAD OF SCI