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Method for promoting sodium ion layered oxide positive electrode material structure to be converted into P2 phase

A technology of positive electrode material and material structure, which is applied in the field of electrochemical power supply, can solve problems affecting electrochemical performance, achieve the effects of optimizing electrochemical performance, simple and easy preparation process, and rich and extensive raw material sources

Pending Publication Date: 2021-07-20
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the synthesis of layered oxide cathode materials is often accompanied by a series of impurity phases
During the charging and discharging process, due to the existence of impurity phases, the cathode material will undergo multiphase transformation with the intercalation / extraction of sodium ions, which seriously affects its electrochemical performance.

Method used

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  • Method for promoting sodium ion layered oxide positive electrode material structure to be converted into P2 phase
  • Method for promoting sodium ion layered oxide positive electrode material structure to be converted into P2 phase
  • Method for promoting sodium ion layered oxide positive electrode material structure to be converted into P2 phase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of 5% cobalt-doped NaCo 0.05 mn 0.95 o 2 Cathode material

[0034] Weigh Na according to the corresponding stoichiometric ratio 2 CO 3 , Mn 2 o 3 、Co 3 o 4 Ball milled for 24 hours, pressed into a disc with a diameter of 10 mm under a pressure of 10 MPa, and calcined at 900 °C for 12 hours in a muffle furnace to obtain a sample powder.

[0035] (2) For NaCo 0.05 mn 0.95 o 2 Sample powder for XRD test

[0036] Using an X-ray diffractometer, the NaCo 0.05 mn 0.95 o 2 The XRD pattern of the sample powder is used to analyze the material effectively with reference to the standard PDF card.

[0037] (3) Preparation of 5% cobalt-doped NaCo 0.05 mn 0.95 o2 Composite cathode

[0038] Mix the prepared positive electrode material with the conductive additive Super-P and the binder polyvinylidene fluoride (PVDF) at a mass ratio of 7:2:1, and add an appropriate amount of N-methylpyrrolidone. After pulping and smearing, , drying and other processes ...

Embodiment 2

[0044] (1) Preparation of 10% cobalt-doped NaCo 0.1 mn 0.9 o 2 Cathode material (raw material is Na 2 CO 3 、Co 3 o 4 , Mn 2 o 3 , and all the other steps are the same as in Example 1)

[0045] (2) For NaCo 0.1 mn 0.9 o 2 Sample powder carries out XRD test (concrete steps are with embodiment 1)

[0046] (3) Preparation of NaCo 0.1 mn 0.9 o 2 Composite positive electrode (concrete steps are with embodiment 1)

[0047] (4) assemble sodium ion battery (concrete steps are with embodiment 1)

[0048] (5) Sodium ion battery test (concrete steps are the same as embodiment 1)

Embodiment 3

[0050] (1) Preparation of 20% cobalt-doped NaCo 0.2 mn 0.8 o 2 Positive electrode material (concrete steps are with embodiment 1)

[0051] (2) For NaCo 0.2 mn 0.8 o 2 Sample powder carries out XRD test (concrete steps are with embodiment 1)

[0052] (3) Preparation of NaCo 0.2 mn 0.8 o 2 Composite positive electrode (concrete steps are with embodiment 1)

[0053] (4) assemble sodium ion battery (concrete steps are with embodiment 1)

[0054] (5) Sodium ion battery test (concrete steps are the same as embodiment 1)

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Abstract

The invention discloses a method for promoting a sodium ion layered oxide positive electrode material structure to be converted into a P2 phase, which is characterized in that the average radius of transition metal is reduced by regulating and controlling the types of doped metal elements and the doping content, and the sodium ion layered oxide positive electrode material is subjected to structure regulation and control, so that the material is promoted to be converted into the P2 phase structure. The P2-type sodium ion battery layered positive electrode material has relatively large space for accommodating Na ions in a phase structure and relatively good stability, but due to the existence of a material impurity phase, multiphase transformation can occur along with the intercalation / deintercalation of the sodium ions, and the electrochemical performance is seriously influenced. Therefore, aiming at the problem of impure structural phase, the method for reducing the average radius of the transition metal M is designed to promote the transformation of the material structure to the P2 phase, and the method is simple in process, easy to operate, rich in raw materials, low in cost and high in practical application degree.

Description

technical field [0001] The invention belongs to the field of electrochemical power sources, and in particular relates to a method for promoting the structure transformation of a sodium ion layered oxide cathode material to a P2 phase by adjusting the average radius of a transition metal element. Background technique [0002] With the further development of energy storage technology, sodium-ion batteries have received more and more attention from the industry and the scientific community, especially in the field of large-scale energy storage, which is expected by all walks of life. Sodium-ion batteries work similarly to lithium-ion batteries and are called "rocking chair batteries." Although the mass of Na is heavier than Li, and the theoretical energy density is lower than that of lithium-ion batteries, the advantage of sodium-ion batteries lies in the abundance and wider distribution of sodium resources (the abundance in the earth's crust is about 2.74%, while the lithium e...

Claims

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Application Information

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IPC IPC(8): C01G51/00H01M4/131H01M4/505H01M4/525H01M10/054
CPCC01G51/50H01M4/505H01M4/525H01M10/054H01M4/131C01P2002/72C01P2006/40H01M2004/028H01M2004/021Y02E60/10
Inventor 姚胡蓉袁新光甘露黄志高
Owner FUJIAN NORMAL UNIV