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Sodium-ion battery positive electrode material, sodium-ion battery, preparation method and electric equipment

A sodium-ion battery and positive electrode material technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of phase transition, poor cycle stability, structural deformation, etc., and achieve ideal theoretical capacity and electrochemical performance Excellent, ideal effect of cycle stability

Pending Publication Date: 2021-12-10
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there are still some problems in transition metal layered oxides, such as the phase transition that easily occurs during the deintercalation process, resulting in structural deformation, thereby degrading the structure, serious attenuation of reversible capacity during cycling, and poor cycle stability.

Method used

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  • Sodium-ion battery positive electrode material, sodium-ion battery, preparation method and electric equipment
  • Sodium-ion battery positive electrode material, sodium-ion battery, preparation method and electric equipment
  • Sodium-ion battery positive electrode material, sodium-ion battery, preparation method and electric equipment

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preparation example Construction

[0052] A kind of preparation method of the positive electrode active material of the sodium ion battery that the present invention replaces by doping with aluminum, comprises the following steps:

[0053] S1. At room temperature, fully grind the corresponding proportion of metal oxide and slightly excess (3wt% to 5wt%) sodium carbonate powder in a mortar, and then use a tablet press to compress the powder into a disc;

[0054] Among them, metal oxides include NiO, Fe 2 o 3 , MnO 2 and Al 2 o 3 , MgO, ZnO, CuO, CaO, TiO 2 , V 2 o 3 and Co 2 o 3 One or more of them, the purity of the reactant is greater than 99%.

[0055] Preferably, the metal oxide is NiO, Fe 2 o 3 , MnO 2 and Al 2 o 3 .

[0056] Starting material NaTmO 2 The molar ratio of the element Na to the element Ni is 2-4, the molar ratio of the element Na to the element Fe is 2-4, and the molar ratio of the element Na to the element Mn is 2-4.

[0057] The molar ratios of the element Na to the elements...

Embodiment 1

[0080] Accurately weigh Na 2 CO 3 (5% excess), NiO, Fe 2 o 3 , MnO 2 =1.05:0.5:0.5:0.5 Put the powder into a mortar and grind for 35 minutes to obtain a uniformly mixed powder. Use a powder tablet press to press the obtained powder into a disc under a pressure of 18Mpa, put it into a muffle furnace, raise the temperature to 950°C at a heating rate of 10°C / min and keep it calcined for 15h, and naturally cool it to room temperature in the furnace to obtain The positive electrode material.

[0081] The material prepared above is mixed with the conductive additive Super-P and the binder polyvinylidene fluoride (PVDF) in a mass ratio of 8:1:1, and the solvent N-methylpyrrolidone (NMP) is added into the ball mill box, Use a planetary ball mill to mill at a speed of 400r / min for 20min, apply the obtained slurry on a cleaned aluminum foil with a scraper, dry it in a vacuum oven at 80°C for 8h, and then cut it into circular pole pieces with a diameter of 10mm.

[0082] The sodium...

Embodiment 2

[0084] Accurately weigh Na 2 CO 3 (5% excess), NiO, Fe 2 o 3 、Al 2 o 3 , MnO 2 =1.05:0.5:0.485:0.015:0.5 Put the powder into a mortar and grind for 35 minutes to obtain a uniformly mixed powder. Use a powder tablet press to press the obtained powder into a disc under a pressure of 18Mpa, put it into a muffle furnace, raise the temperature to 950°C at a heating rate of 10°C / min and keep it calcined for 15h, and naturally cool it to room temperature in the furnace to obtain The positive electrode material.

[0085] The material prepared above is mixed with the conductive additive Super-P and the binder polyvinylidene fluoride (PVDF) in a mass ratio of 8:1:1, and the solvent N-methylpyrrolidone (NMP) is added into the ball mill box, Use a planetary ball mill to mill at a speed of 400r / min for 20min, apply the obtained slurry on a cleaned aluminum foil with a scraper, dry it in a vacuum oven at 80°C for 8h, and then cut it into circular pole pieces with a diameter of 10mm. ...

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Abstract

The invention discloses a sodium ion battery positive electrode material, a sodium ion battery, a preparation method and electric equipment. According to the invention, an aluminum ion doped O3 layered positive electrode material is prepared by using a simple solid-phase synthesis method or a coprecipitation method, and the aluminum ion doped O3 layered positive electrode material is assembled into a sodium ion battery for testing; and the synthesis conditions of the material are researched by changing the doping ratio, the calcining condition, the ball milling condition, the electrolytic solution and the like, and the corresponding electrochemical performance including the cycling stability, the rate capability and the like is further researched.

Description

technical field [0001] The invention belongs to the technical field of sodium ion battery materials, and in particular relates to a sodium ion battery positive electrode material, a sodium ion battery, a preparation method and electrical equipment. Background technique [0002] Compared with lithium-ion batteries, sodium-ion batteries have a similar working principle, and the sodium used in them is more widely distributed in the earth's crust, and the price is much lower. The rich reserves and insertion mechanism of sodium make sodium-ion batteries large-scale It is an ideal substitute for lithium-ion batteries in applications. However, the current sodium-ion batteries have problems of poor cycle stability and poor rate performance. Therefore, improving the cycle stability and rate performance of cathode materials for sodium-ion batteries has become the key to the related research of sodium-ion batteries. [0003] In recent years, transition metal layered oxides Na x TmO ...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M10/054H01M4/13
CPCH01M10/054H01M4/48H01M4/13Y02E60/10
Inventor 冯意虎王鹏飞韩晓刚钱荣成
Owner XI AN JIAOTONG UNIV
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