High-specific-energy sodium-ion battery manganese-based layered positive electrode material and preparation method thereof

A sodium-ion battery and cathode material technology, applied in the field of electrochemistry, can solve the problems of high-voltage platform attenuation or disappearance structure, rapid capacity potential attenuation, first cycle irreversibility, etc., to improve electrochemical stability and improve cycle stability , Excellent structural stability and cycle stability

Active Publication Date: 2021-12-10
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these materials usually have the problems of irreversibility in the first cycle, attenuation or disappearance of the high-voltage platform in subsequent cycles, and oxygen release and rapid capacity potential decay due to structural instability.
[0005] Therefore, designing a cathode material with multi-channel charge compensation and stable structure is an effective strategy to achieve high energy density and sustainable cycle Na-ion batteries, and it is also a great challenge.

Method used

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  • High-specific-energy sodium-ion battery manganese-based layered positive electrode material and preparation method thereof
  • High-specific-energy sodium-ion battery manganese-based layered positive electrode material and preparation method thereof
  • High-specific-energy sodium-ion battery manganese-based layered positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0051] (1) According to the molar ratio of 0.6:0.2:0.6:0.2, accurately weigh the corresponding mass of Na 2 CO 3 (5% excess), LiOH•H 2 O, MnO 2 and RuO 2 , added to the ball mill jar, and then added ball mill balls, at 300 r min -1 Under the conditions of ball milling for 15 h, the above precursors were mixed evenly, and the mixed precursors were dried in an oven at 100 °C for 12 h.

[0052] (2) Press the ball-milled mixture into a disc with a diameter of 16 mm under a pressure of 10 MPa.

[0053] (3) The flake samples obtained in step (2) were calcined step by step in a tube furnace, at 5°C min in an air atmosphere -1 Heat up to 500°C, calcine for 5 h; cool down to room temperature with the furnace, grind it and press it again, heat up to 700°C, and calcine for 7 h; repeat the above operation and heat up to 1100°C, after calcination for 11 h, cool down in the furnace and take out the sample for grinding The original powder is obtained, whose molecular formula is Na 0.6...

Embodiment 2

[0064] Change the molar ratio of each substance, according to the molar ratio of 0.6:0.05:0.9:0.05, accurately weigh the corresponding mass of Na 2 CO 3 , MnO 2 and RuO 2 According to the method of steps (1)-(3) in Example 1, a high specific energy manganese-based layered cathode material for a sodium ion battery was prepared, and its molecular formula was Na 0.6 Li 0.05 mn 0.9 Ru 0.05 o 2 .

Embodiment 3

[0066] Change the molar ratio of each substance, according to the molar ratio is 0.6:0.1:0.8:0.1, accurately weigh the Na of corresponding quality 2 CO 3 , MnO 2 and RuO 2 According to the method of steps (1)-(3) in Example 1, a high specific energy manganese-based layered cathode material for a sodium ion battery was prepared, and its molecular formula was Na 0.6 Li 0.1 mn 0.8 Ru 0.1 o 2 .

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Abstract

The invention relates to the field of electrochemistry, and especially relates to a high-specific-energy sodium-ion battery manganese-based layered positive electrode material. The general formula of the material is NaxLiyMn1-y-zMzO2, wherein M is Ru, Ni, Cu, Zn, Mg or Ti, x is more than or equal to 0.5 and less than or equal to 1, y is more than 0 and less than or equal to 0.33, and z is more than 0 and less than or equal to 0.33. In the positive electrode material, the Li element occupies the transition metal layer, and the Li-O-Na configuration triggers the non-hybrid energy level of oxygen and triggers the oxidation reduction of oxygen. According to the high-specific-energy sodium-ion battery manganese-based layered positive electrode material, a small amount of other metal M is uniformly doped, and a stronger covalent bond is formed relative to manganese and oxygen, so that the structural stability of lattice oxygen after electrons near oxygen are removed is improved, and the cycling stability of the sodium-ion battery is improved.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a high specific energy manganese-based layered positive electrode material for a sodium ion battery. Background technique [0002] Na-ion batteries have broad application prospects in large-scale energy storage systems and smart grids due to their abundant raw materials and low cost. The development of cathode materials with high specific capacity and stable cycle is the key to the further practical application of sodium-ion batteries. Among the numerous cathode materials for sodium-ion batteries, layered transition metal oxides have been extensively studied due to a series of advantages such as high specific capacity, simple synthesis, abundant components, and controllable structure. Among them, the manganese-based layered materials also have the advantages of low price, environmental friendliness, and the diversity of valence states can adjust the voltage range of the electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/485H01M4/50H01M4/505H01M4/52H01M4/525
CPCH01M4/366H01M4/505H01M4/502H01M4/523H01M4/525H01M4/485H01M4/483Y02E60/10
Inventor 郭少华许航
Owner NANJING UNIV
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