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Layered oxide positive electrode material with excellent air stability and method for improving air stability by adjusting sodium content

A technology of air stability and positive electrode materials, which is applied in the field of electrochemical power sources, can solve the problems of transportation and application restrictions, poor air stability of positive electrode materials, etc., and achieve the effects of optimizing electrochemical performance, improving anti-oxidation ability, and excellent air stability

Active Publication Date: 2021-05-25
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the poor air stability of such layered oxide cathode materials, such materials urgently need to be placed in an environment filled with inert gas for protection after preparation.
This has led to great restrictions on the transportation and application of such materials in the actual production process

Method used

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  • Layered oxide positive electrode material with excellent air stability and method for improving air stability by adjusting sodium content
  • Layered oxide positive electrode material with excellent air stability and method for improving air stability by adjusting sodium content
  • Layered oxide positive electrode material with excellent air stability and method for improving air stability by adjusting sodium content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of Na 0.93 Li 0.12 Ni 0.25 Fe 0.15 mn 0.48 o 2 Cathode material

[0028] Weigh Na according to the corresponding proportion 2 CO 3 , Li 2 CO 3 , NiO, Fe 2 o 3 , Mn 2 o 3 , ball milled for 24h, pressed into a disc with a diameter of 10mm under a pressure of 10MPa, and calcined at 950°C for 24h in a muffle furnace to obtain a sample powder.

[0029] (2) For Na 0.93 Li 0.12 Ni 0.25 Fe 0.15 mn 0.48 o 2 Sample powder for XRD test

[0030] Use an X-ray diffractometer to obtain Na by using the diffraction effect of X-rays in crystal substances 0.93 Li 0.12 Ni 0.25 Fe 0.15 mn 0.48 o 2 The XRD pattern of the sample powder is used to analyze the material effectively with reference to the standard PDF card.

[0031] (3) Preparation of Na 0.93 Li 0.12 Ni 0.25 Fe 0.15 mn 0.48 o 2 Composite cathode

[0032] Mix the prepared positive electrode material with the conductive additive Super-P and the binder polyvinylidene fluoride (PVDF) in...

Embodiment 2

[0040] (1) Preparation of Na 0.93 Li 0.12 Ni 0.25 Fe 0.2 mn 0.43 o 2 Cathode material

[0041] Weigh Na according to the corresponding proportion 2 CO 3 , Li 2 CO 3 , NiO, Fe 2 o 3 , Mn 2 o 3 , ball milled for 24h, pressed into a disc with a diameter of 10mm under a pressure of 10MPa, and calcined at 950°C for 24h in a muffle furnace to obtain a sample powder.

[0042] (2) For Na 0.93 Li 0.12 Ni 0.25 Fe 0.2 mn 0.43 o 2 Sample powder carries out XRD test and data is processed and analyzed (concrete steps are with embodiment 1)

[0043] (3) Preparation of Na 0.93 Li 0.12 Ni 0.25 Fe 0.2 mn 0.43 o 2 Composite positive electrode (concrete steps are with embodiment 1)

[0044] (4) assemble sodium ion battery (concrete steps are with embodiment 1)

[0045] (5) Sodium ion battery test (concrete steps are the same as embodiment 1)

[0046] (6) Exposure sample test (concrete steps are with embodiment 1)

Embodiment 3

[0048] (1) Preparation of Na 0.93 Li 0.12 Ni 0.25 co 0.15 mn 0.48 o 2 Cathode material

[0049] Weigh Na according to the corresponding proportion 2 CO 3 , Li 2 CO 3 , NiO, Co 3 o 4 , Mn 2 o 3 , ball milled for 24h, pressed into a disc with a diameter of 10mm under a pressure of 10MPa, and calcined at 950°C for 24h in a muffle furnace to obtain a sample powder.

[0050] (2) For Na 0.93 Li 0.12 Ni 0.25 co 0.15 mn 0.48 o 2 Sample powder carries out XRD test and data is processed and analyzed (concrete steps are with embodiment 1)

[0051] (3) Preparation of Na 0.93 Li 0.12 Ni 0.25 co 0.15 mn 0.48 o 2 Composite positive electrode (concrete steps are with embodiment 1)

[0052] (4) assemble sodium ion battery (concrete steps are with embodiment 1)

[0053] (5) Sodium ion battery test (concrete steps are the same as embodiment 1)

[0054] (6) Exposure sample test (concrete steps are with embodiment 1)

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Abstract

The invention discloses a layered oxide positive electrode material with excellent air stability and a method for improving the air stability by adjusting the sodium content. The layered oxide positive electrode material is of an O<3> phase, and the chemical formula is Na<x>MeO<>2, wherein Me at least contains one or more elements of Li, Ni, Fe, Co and Mn, x is the stoichiometric number of Na, and x is greater than or equal to 0.93 and less then or equal to 0.95. By reducing the content of sodium ions in the O<3> type layered positive electrode material of the sodium ion battery, enhancing the strength of Na-O bonds, reducing the probability of reaction with the outside, improving the valence state of transition metal ions in the material and improving the oxidation resistance of the material, the electrode material with more excellent air stability is obtained. The preparation method disclosed by the invention is simple and easy to operate, rich in raw materials, low in price and high in practical application degree, so that a new insight is provided for optimization design of the layered positive electrode material of the high-performance sodium-ion battery, and the preparation method has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of electrochemical power sources, and in particular relates to a class of layered oxide cathode materials with excellent air stability and a method for improving air stability by adjusting sodium content. Background technique [0002] At present, energy and environment are two major issues facing society today, guiding people's life and development in all aspects, and the development and utilization of clean energy is very urgent. However, the utilization of uncontrollable energy forms such as wind energy and solar energy has put forward high requirements for the development of energy storage systems with high efficiency, safety and low price. On the one hand, sodium-ion batteries have comparable performance advantages to lithium-ion batteries. On the other hand, because of the abundance of sodium resources, they show strong competitiveness in the field of large-scale energy storage devices. The exploration and resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/054C01G53/00
CPCH01M4/505H01M4/525H01M10/054C01G53/44C01P2002/72C01P2002/20H01M2004/021H01M2004/028Y02E60/10
Inventor 姚胡蓉袁新光甘露黄志高朱海亮欧阳楚英
Owner FUJIAN NORMAL UNIV
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