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Sodium-containing oxide positive electrode material, preparation method and application thereof, positive plate and application thereof

A technology for cathode materials and oxides, applied in the field of sodium-containing oxide cathode materials and their preparation, and cathode sheets, can solve the problems of lower discharge specific capacity and rate performance, lower material safety performance, and high soluble alkali content, and achieve improved charging. Discharge capacity, high safety, effect of reducing soluble alkali content

Active Publication Date: 2022-08-02
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the excessively high soluble alkali content on the surface of the sodium-containing metal oxide material in the prior art, resulting in a decrease in material safety performance, a decrease in discharge specific capacity and rate performance, and serious side reactions in the cycle process leading to cycle performance. exacerbated defects

Method used

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  • Sodium-containing oxide positive electrode material, preparation method and application thereof, positive plate and application thereof
  • Sodium-containing oxide positive electrode material, preparation method and application thereof, positive plate and application thereof

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preparation example Construction

[0089] A second aspect of the present invention provides a method for preparing a sodium-containing oxide cathode material, characterized in that the method comprises the following steps:

[0090] The sodium-containing ferromanganese cathode material precursor is first sintered, and then crushed and sieved after cooling to obtain the sodium-containing oxide cathode material;

[0091] Wherein, in the process of the first sintering, an oxygen-containing atmosphere is introduced;

[0092] The introduction amount of the oxygen-containing atmosphere is 1-15m 3 / h, the humidity of the oxygen-containing atmosphere is less than or equal to 10RH%;

[0093] The temperature T1 of the first sintering satisfies the following conditions: 500×(1+y)≤T1≤400×(3-y)°C, y is the content of Mn in the sodium manganese iron oxide cathode material;

[0094] The constant temperature time of the first sintering is 6-20h;

[0095] The heating rate of the first sintering is less than or equal to 10°C / m...

Embodiment 1

[0197] (1) Accurately weigh manganese dioxide, ferric oxide, nickelous oxide, copper oxide and sodium carbonate according to the molar ratio of manganese, iron, nickel, copper and sodium elements as 4:2:2:2:8, add An appropriate amount of ethanol is mixed with the medium, and the ball-milling mixture is uniformly obtained to obtain the precursor Q1 for the cathode material of the sodium-manganese-iron metal oxide.

[0198] (2) The uniformly mixed precursor Q1 is placed in a muffle furnace and heated from room temperature to 850°C (y=0.4), maintained for 15h, and the heating rate is 5°C / min, and the first sintering is performed. During the first sintering process, dry air with humidity less than 5RH% is continuously introduced, and the ventilation volume is 10m 3 / h. After natural cooling, crushing and sieving, the sodium-containing metal oxide cathode material S1 is obtained.

[0199] The preparation methods of Examples 2-7 are similar to those of Example 1, as shown in Tabl...

Embodiment 8

[0207] (1) dissolving manganese sulfate, iron sulfate, nickel sulfate, and copper sulfate according to the molar ratio of manganese, iron, nickel, and copper elements is 4:2:2:2 to obtain a mixed salt solution with a concentration of 2mol / L, and the hydrogen Sodium oxide is dissolved into a precipitant solution with a concentration of 2 mol / L, and ammonia water is dissolved into a complexing agent solution with a concentration of 3 mol / L. The precipitating agent, the complexing agent solution and the mixed salt solution were added to the reaction kettle in parallel, and the reaction was carried out for 30 hours at a temperature of 45 °C, a pH value of 10.5, and a stirring speed of 700 rpm, and then the slurry was filtered and washed. The filter cake is sieved after drying at 120 °C to obtain the process product P8, the chemical formula is Mn 0.4 Fe 0.2 Ni 0.2 Cu 0.2 (OH) 2 .

[0208] (2) Mixing sodium carbonate and precursor Q8 uniformly to obtain precursor Q8.

[0209] ...

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Abstract

The invention relates to the technical field of sodium ion batteries, and discloses a sodium-containing oxide positive electrode material, a preparation method and application thereof, a positive plate and application thereof. The content of soluble alkali on the surface of the positive electrode material meets the following conditions: (1) m (Na2CO3) + m (NaOH) is less than or equal to 15000ppm; (2) 0.1 < = m (Na2CO3) / m (NaOH) < = 1. The surface of the sodium-containing metal oxide positive electrode material has low soluble alkali content, and when the positive electrode material is applied to a sodium ion battery, the battery can have high capacity, high rate and high safety, and sodium ion deintercalation / intercalation reaction can be continuously performed without obviously causing reduction of the battery capacity.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to a positive electrode material containing sodium oxide, a preparation method and application thereof, a positive electrode sheet and application thereof. Background technique [0002] Lithium-ion batteries have been successfully used in portable electronics. At present, the application of lithium-ion batteries is gradually expanding to large-scale energy storage grids, electric vehicles and other fields. However, the development of alternative energy storage systems is necessary given the limited lithium resources and the potential for high cost of lithium-ion batteries in the future. In recent years, sodium-ion batteries have attracted renewed attention due to the natural abundance and low cost of sodium resources. [0003] In recent years, a lot of research has been done on the development of new electrode materials for sodium-ion batteries, the layered transition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M10/054C01G53/00C01G51/00C01G55/00C01G49/00
CPCH01M4/505H01M4/525H01M4/485H01M10/054C01G53/50C01G51/50C01G55/002C01G49/0072C01P2006/11C01P2006/40C01P2006/12H01M2004/021H01M2004/028Y02E60/10H01M4/381H01M4/36C01P2002/74C01G51/66C01G51/70C01G53/66C01G53/70C01P2002/52C01P2002/72C01P2004/03C01P2006/10
Inventor 王俊陈飞江刘亚飞陈彦彬
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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