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Anion-doped sodium ion battery oxide cathode material

A sodium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of poor cycle stability, limited commercial application, low capacity, etc. order, improve the effect of phase transition reaction

Inactive Publication Date: 2017-08-25
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current transition metal oxide materials still have many problems, such as low capacity and poor cycle stability, which limit their commercial application.

Method used

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  • Anion-doped sodium ion battery oxide cathode material
  • Anion-doped sodium ion battery oxide cathode material
  • Anion-doped sodium ion battery oxide cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]Example 1: Weigh 13.9391g of sodium carbonate, 6.6877g of manganese dioxide, 5.7177g of nickelous oxide, and 8.0652g of ferric oxide into a ball mill jar. The ball mill jar was mechanically milled for 4 hours on a planetary ball mill with a rotational speed of 513r / min. Then, the precursor was calcined in a muffle furnace at 1000 °C for 12 h with a heating rate of 2 °C min -1 . After cooling to room temperature, the target product NaFe 0.4 Ni 0.3 mn 0.3 o 2 .

[0027] The active material was uniformly mixed with a conductive agent (acetylene black) and a binder (4% PVDF in NMP solution), and the ratio of the active material, conductive agent and binder was 70:20:10. The slurry was uniformly coated on the aluminum foil current collector, and dried in a vacuum oven at 100°C for 12 hours. After drying, the aluminum foil loaded with materials is punched into small discs using a punching machine.

[0028] The electrode material pole piece is used as the working electr...

Embodiment 2

[0029] Example 2: 13.9391g of sodium carbonate, 6.6877g of manganese dioxide, 5.7177g of nickel oxide, 8.0652g of ferric oxide and 0.7768g of boric acid were weighed and added to a ball mill jar. The ball mill jar was mechanically milled for 4 hours on a planetary ball mill with a rotational speed of 513r / min. Then, the precursor was calcined in a muffle furnace at 1000 °C for 12 h with a heating rate of 2 °C min -1 . After cooling to room temperature, the target product NaFe 0.4 Ni 0.3 mn 0.3 o 1.925 (BO 3 ) 0.05 . The XRD pattern of the obtained product is as follows figure 2 shown.

[0030] The electrochemical testing method of the material is the same as in Example 1. The cycle curve of the material in the first 30 weeks is as follows image 3 shown. The capacity retention rate of the material in the first 30 weeks was 97.6%, showing good cycle stability.

Embodiment 3

[0031] Example 3: 13.9391g of sodium carbonate, 6.6877g of manganese dioxide, 5.7177g of nickel oxide, 8.0652g of ferric oxide and 0.3107g of boric acid were weighed and added to a ball mill jar. The ball mill jar was mechanically milled for 4 hours on a planetary ball mill with a rotational speed of 513r / min. Then, the precursor was calcined in a muffle furnace at 1000 °C for 12 h with a heating rate of 2 °C min -1 . After cooling to room temperature, the target product NaFe 0.4 Ni 0.3 mn 0.3 o 1.97 (BO 3 ) 0.02 .

[0032] The electrochemical testing method of the material is the same as in Example 1. The charge-discharge curve of the material in the first week is as follows: Figure 4 As shown, it has an initial discharge specific capacity of 131.6mAh / g.

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Abstract

The invention relates to an anion-doped sodium ion battery oxide cathode material. The general formula of the material is NaaMbNcOdYy, wherein a is greater than 0.4 and smaller than 1, b is greater than 0 and equal to or smaller than 1, c is equal to or greater than 0 and equal to or smaller than 1, b plus c is 1, y is greater than 0 and equal to or smaller than 0.1, double d plus a value obtained by multiplying n and y is 4, and the n is the valence state of an anion represented by Y; M is one or more of variable-valence metal elements of Fe, Ni, Mn, Co, V, Cr and Ti; N is one or more of immutable-valence metal elements of Zn, Mg, K, Ca and Al; Y is one or more of F<->, Cl<->, SO4<2->, BO3<3->, PO4<3-> and SiO4<4->. According to the anion-doped sodium ion battery oxide cathode material, anion doping is introduced in a sodium ion battery oxide cathode material, the stability of the structure of the material can be maintained, the electrochemical performance of the material is improved, and the material has very good application prospects.

Description

technical field [0001] The invention relates to an anion-doped sodium ion battery oxide cathode material, belonging to the field of sodium ion battery cathode materials. Background technique [0002] Resource depletion and environmental pollution have become the bottleneck of traditional energy development. Changing the current energy structure and developing new energy have become an urgent task in today's society. Since 1991, the first commercialized lithium-ion battery, the carbon / cobalt oxide lithium battery, has been used in portable energy storage devices. Due to its high voltage, high energy density and long life, lithium-ion batteries have quickly entered the portable electronics industry. equipment and electric vehicles. However, with the further development of electric vehicles and electrochemical energy storage, the price of lithium, which is relatively scarce, is bound to continue to increase. Therefore, it is extremely important to develop next-generation ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/054
CPCH01M4/364H01M4/505H01M4/525H01M4/5825H01M4/628H01M10/054Y02E60/10
Inventor 曹余良刘兴伟贾彦龙江晓宇艾新平杨汉西
Owner WUHAN UNIV
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