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Composite positive electrode material and preparation method thereof

A positive electrode material and composite layer technology, applied in the field of composite positive electrode material and its preparation, can solve the problems of electrolyte corrosion and structural instability, and achieve the effects of short cycle, low cost, simple and controllable process

Pending Publication Date: 2022-01-28
陈琴雅 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing cathode materials for sodium-ion batteries have problems such as structural instability of layered materials and corrosion by electrolytes during cycling.
Therefore, the development of structurally stable layered materials still faces major challenges

Method used

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Experimental program
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Effect test

Embodiment 1

[0043] In this embodiment, the positive electrode material is the Na core of O3 phase. 0.87 Li 0.04 Ni 0.25 Fe0.25 mn 0.5 o 2 , the outer shell is Na in P2 phase 0.67 Li 0.04 Cu 0.10 Fe 0.20 mn 0.70 o 2 The composite layered cathode material was prepared using a co-precipitation method combined with a solid-state reaction. Specific steps are as follows:

[0044] According to the above stoichiometric ratio, the NiSO 4 , FeSO 4 , MnSO 4 Prepare a mixed solution A with a total concentration of 1mol / L, and mix CuSO 4 , FeSO 4 , MnSO 4 Make a mixed solution B with a total concentration of 1mol / L, and configure the complexing agent NH 3 ·H 2 O solution C and precipitant Na 2 CO 3 Solution C; inject solution A, solution C and solution D into the reaction vessel at the same time, and carry out co-precipitation reaction at 50 ° C; after the reaction, inject solution B, solution C and solution D into the reaction vessel at the same time. Carry out co-precipitation re...

Embodiment 2

[0056] In this embodiment, the positive electrode material is the Na core of O3 phase. 0.84 Li 0.05 Ni 0.30 Fe 0.25 mn 0.45 o 2 , the outer shell is Na in P2 phase 0.65 Li 0.05 Mg 0.06 Cu 0.10 Fe 0.16 mn 0.68 o 2 The composite layered cathode material was prepared using a co-precipitation method combined with a solid-state reaction. Specific steps are as follows:

[0057] According to the above stoichiometric ratio, the NiSO 4 , FeSO 4 , MnSO 4 Prepare a mixed solution A with a total concentration of 1mol / L, and mix CuSO 4、 MgSO 4 , FeSO 4 , MnSO 4 Make a mixed solution B with a total concentration of 1mol / L, and configure the complexing agent NH 3 ·H 2 O solution C and precipitant Na 2 CO 3 Solution C; inject solution A, solution C and solution D into the reaction vessel at the same time, and carry out co-precipitation reaction at 50 ° C; after the reaction, inject solution B, solution C and solution D into the reaction vessel at the same time. Carry ou...

Embodiment 3

[0059] In this embodiment, the positive electrode material is the Na core of O3 phase. 0.87 Li 0.03 Ni 0.30 Fe 0.30 mn 0.40 o 2 , the outer shell is Na in P2 phase 0.66 Li 0.03 Ni 0.10 Cu 0.08 Fe 0.10 mn 0.72 o 2 The composite layered cathode material was prepared using a co-precipitation method combined with a solid-state reaction. Specific steps are as follows:

[0060] According to the above stoichiometric ratio, the NiSO 4 , FeSO 4 , MnSO 4 Make a mixed solution A with a total concentration of 1mol / L, NiSO 4 、CuSO 4 , FeSO 4 , MnSO 4 Make a mixed solution B with a total concentration of 1mol / L, and configure the complexing agent NH 3 ·H 2 O solution C and precipitant Na 2 CO 3 Solution C; inject solution A, solution C and solution D into the reaction vessel at the same time, and carry out co-precipitation reaction at 50 ° C; after the reaction, inject solution B, solution C and solution D into the reaction vessel at the same time. Carry out co-precip...

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Abstract

The invention discloses a composite sodium ion positive electrode material. The material is of a core-shell structure and is composed of an O3 phase layered material of an inner core and a P2 phase layered material of an outer shell. The high capacity of the inner core O3 type layered material and the high cycle stability of the outer shell P2 type material are integrated, the composite layered material is obtained by subtly regulating and controlling the components of the inner core and the outer shell and combining lithium doping and temperature control, and the composite layered material has excellent comprehensive performance including capacity and cycle performance.

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 thereof. Background technique [0002] With the increasing depletion of fossil fuels and the increasing severity of environmental problems, the development of sustainable clean energy, such as wind energy, solar energy, etc. has been paid more and more attention. However, this type of clean energy has the disadvantages of variability and volatility, and requires corresponding batteries to regulate In order to reduce the curtailment rate of light and wind, clean energy power generation combined with energy storage is an important model and development direction of new energy development. [0003] At present, in the field of electrochemical energy storage, lithium-ion batteries are in a dominant position, but with the development of large-scale energy storage and the popular...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/054
CPCH01M4/366H01M4/505H01M4/525H01M10/054H01M2004/028Y02E60/10
Inventor 陈琴雅吕宜媛
Owner 陈琴雅
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