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Sodium ion secondary battery and preparation method thereof

A secondary battery, sodium ion technology, applied in secondary batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve problems such as affecting the high rate performance of electrode materials, irreversible changes in the lattice structure of materials, and affecting the performance of electrode materials. , to achieve the effect of improving fast charge and discharge performance, improving electrochemical performance and high capacity

Active Publication Date: 2021-10-19
深圳市博理科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with lithium ions, because sodium ions have a larger ionic radius, if the positive electrode material is such as lithium cobaltate (LiCoO 2 ) represented by layered transition metal oxides and lithium iron phosphate (LiFePO 4 ) as the representative transition metal phosphate, the intercalation process of sodium ions in this type of material will cause an irreversible change in the lattice structure of the material, thus affecting the deterioration of the performance of the electrode material
In addition, since the transport channels provided by this type of material are mostly one-dimensional or two-dimensional, this brings greater steric obstacles to the transport of sodium ions with large ionic radii, which affects the high rate performance of electrode materials. to play

Method used

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  • Sodium ion secondary battery and preparation method thereof
  • Sodium ion secondary battery and preparation method thereof
  • Sodium ion secondary battery and preparation method thereof

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preparation example Construction

[0040] combine figure 1 , the present invention also provides a method for preparing the above-mentioned sodium ion secondary battery in an embodiment, comprising the following steps:

[0041] S10, providing a formula X 3 [YMo 6 o 24 h 6 ] as the first cathode material.

[0042] Among them, X is NH 4 , Li, Na or K, Y is Al, Ni, Co, Mn or Fe.

[0043] Specifically, the first positive electrode material can be prepared by the following operations: to YCl 3 Add X to the solution 2 MoO 4 2H 2 O, then use hydrochloric acid (preferably 35 wt% hydrochloric acid) to adjust the pH of the solution to 1.8, and heat and evaporate (preferably 80° C.) to obtain the first positive electrode material.

[0044] S20, providing a formula A 7 [ZV 13 o 38 ] as the second cathode material.

[0045] Among them, A is NH 4 , Li, Na or K, Z=Ni, Co or Mn.

[0046] to AVO 3 Add HNO to the solution 3 、ZSO 4 and K 2 S 2 o 8 The mixed liquid is obtained, and the second positive electro...

Embodiment 1

[0063] 0.829g AlCl 3 Dissolve in 25mL deionized water, add 3.5g (NH 4 ) 2 MoO 4 2H 2 O, adjust the pH value of the solution to 1.8 with 35% HCl, and heat and evaporate. After the solvent evaporates, a solid crystal is obtained. The solid crystalline product has molecular formula (NH 4 ) 3 [AlMo 6 o 24 h 6 ]’s first positive electrode material, the XRD diffraction pattern of its crystal structure is as follows figure 2 shown.

[0064] Depend on figure 2 It can be seen that the first positive electrode material has a crystal structure, and the corresponding crystal interior has multi-dimensional space channels required for the transmission of large-sized sodium ions.

[0065] 7.18g KVO 3 Dissolve in 180mL deionized water at 80°C, add 4mL 1mol / L HNO 3 , 4mL1mol / L of MnSO 4 and 2.16g of K 2 S 2 o 8 , the mixed solution was stirred at a temperature of 80° C. until the solvent evaporated, and a solid crystal was obtained. The solid crystal has the molecular formu...

Embodiment 2

[0070] The recrystallization particle that embodiment 1 makes: Conductive carbon black: Positive pole binder (PVDF) is carried out slurry preparation, coating, drying, roll pressing, cutting piece by the mass percentage of 50%: 30%: 20% , to obtain the positive electrode sheet. EC:DMC=1:1 (volume ratio)+1mol / L NaClO 4 As the electrolyte, sodium metal as the negative electrode, assembled into a button battery.

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Abstract

The invention discloses a sodium ion secondary battery and a preparation method thereof. The sodium ion secondary battery comprises a positive plate, a negative plate and an electrolyte. The positive plate comprises a first positive electrode material with a general formula X3 [YMo6O24H6] and a second positive electrode material with a general formula A7 [ZV13O38], wherein X is NH4, Li, Na or K, Y is Al, Ni, Co, Mn or Fe, A is NH4, Li, Na or K, and Z is Ni, Co or Mn. The negative plate comprises metal sodium. The positive plate of the sodium ion secondary battery comprises the first positive electrode material and the second positive electrode material, and both the first positive electrode material and the second positive electrode material have space structures capable of accommodating large-size sodium ions. In the charging and discharging process, the change of material crystal lattices does not influence the performance of the electrode material. Therefore, the electrochemical performance of the sodium ion secondary battery can be improved, and the sodium ion secondary battery has relatively high capacity and relatively long cycle life.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to a sodium ion secondary battery and a preparation method thereof. Background technique [0002] In today's daily life, lithium-ion secondary batteries have been widely used in mobile phones, notebook computers and other digital products, and are indispensable energy storage devices. However, due to the shortage of lithium resources, it will be a severe test for lithium resources as the demand for lithium-ion batteries continues to rise. [0003] Sodium is a rich and cheap resource on the earth. In order to persist in the sustainable development of resources, the development of sodium-ion secondary batteries will be the first choice. Compared with lithium ions, because sodium ions have a larger ionic radius, if the positive electrode material is such as lithium cobaltate (LiCoO 2 ) represented by layered transition metal oxides and lithium iron phosphate (LiFePO 4 ) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/36H01M4/485H01M10/054
CPCH01M4/485H01M4/364H01M10/054H01M4/13H01M2004/028Y02E60/10
Inventor 倪尔福骆旎
Owner 深圳市博理科技有限公司
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