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Method for improving superlattice structure of sodium ion layered positive electrode material

A positive electrode material and superlattice technology, applied in the field of electrochemical power supply, can solve problems such as limiting sodium ion transport capacity and cycle performance, complex electrochemical behavior, etc., to improve electrochemical stability, optimize electrochemical performance, and preparation process Simple and easy-to-achieve effects

Active Publication Date: 2021-07-13
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the charge ordering and Na + The superlattice structure formed by / vacancies orderly, and a voltage plateau appears in the electrochemical curve, resulting in a higher energy barrier and limiting the sodium ion transport capacity and cycle performance, resulting in complex electrochemical behavior

Method used

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  • Method for improving superlattice structure of sodium ion layered positive electrode material
  • Method for improving superlattice structure of sodium ion layered positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of Na 0.67 sn 0.05 Ni 0.28 mn 0.67 o 2 Cathode material

[0027] Weigh Na according to the corresponding proportion 2 CO 3 , NiO, Mn 2 o 3 , SnO 2 , ball milled for 24h, pressed into a disc with a diameter of 10mm under a pressure of 10MPa, and calcined at 950°C for 12h in a muffle furnace to obtain a sample powder.

[0028] (2) For Na 0.67 sn 0.05 Ni 0.28 mn 0.67 o 2 Sample powder for XRD test

[0029] Using an X-ray diffractometer, the Na 0.67 sn 0.05 Ni 0.28 mn 0.67 o 2 The XRD pattern of the sample powder is used to analyze the material effectively with reference to the standard PDF card.

[0030] (3) Preparation of Na 0.67 sn 0.05 Ni 0.28 mn 0.67 o 2 Composite cathode

[0031] The prepared positive electrode material is uniformly mixed with the conductive additive Super-P and the binder polyvinylidene fluoride (PVDF) at a mass ratio of 7.5:1.5:1, and the solvent N-methylpyrrolidone is added to make pulp, smear, drying and ...

Embodiment 2

[0037] (1) Preparation of Na 0.67 Al 0.05 Ni0.28 mn 0.67 o 2 Cathode material. (Raw material is Na 2 CO 3 , NiO, Mn 2 o 3 、Al 2 o 3 , and all the other steps are the same as in Example 1. )

[0038] (2) For Na 0.67 al 0.05 Ni 0.28 mn 0.67 o 2 Sample powder carries out XRD test (concrete steps are with embodiment 1)

[0039] (3) Preparation of Na 0.67 al 0.05 Ni 0.28 mn 0.67 o 2 Composite positive electrode (concrete steps are with embodiment 1)

[0040] (4) assemble sodium ion battery (concrete steps are with embodiment 1)

[0041] (5) Sodium ion battery test (concrete steps are the same as embodiment 1)

Embodiment 3

[0043] (1) Preparation of Na 0.67 Li 0.05 Ni 0.28 mn 0.67 o 2 Cathode material. (Raw material is Na 2 CO 3 , NiO, Mn 2 o 3 , Li 2 CO 3 , and all the other steps are the same as in Example 1. )

[0044] (2) For Na 0.67 Li 0.05 Ni 0.28 mn 0.67 o 2 Sample powder carries out XRD test (concrete steps are with embodiment 1)

[0045] (3) Preparation of Na 0.67 Li 0.05 Ni 0.28 mn 0.67 o 2 Composite positive electrode (concrete steps are with embodiment 1)

[0046] (4) assemble sodium ion battery (concrete steps are with embodiment 1)

[0047] (5) Sodium ion battery test (concrete steps are the same as embodiment 1)

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Abstract

The invention discloses a method for improving a superlattice structure of a sodium ion layered positive electrode material, which comprises the following steps of: doping a metal element with valence state different from that of transition metal into the sodium ion layered positive electrode material with superlattice characteristics, so that the superlattice structure with ordered charge and ordered Na < + > / vacancy is changed; and preparing disordered sodium ion layered positive electrode material without superlattice structure, namely NamAxByC1-x-yO2, wherein A is a non-active substance metal element with electrochemical activity, B and C are transition metal elements, the valence states of A and B are different in the material, in the formula, m is larger than or equal to 0.15 and smaller than or equal to 0.85, and x + y is smaller than or equal to 1. As the sodium ion battery layered positive electrode material with the superlattice structure has a higher energy barrier and limits the sodium ion transmission capability and the cycle performance, the sodium ion battery layered positive electrode material can modulate a Na < + > / vacancy disordered superlattice-free structure by controlling the doping valence state; and a new insight is provided for the optimization design of the high-performance sodium ion battery positive electrode layered material, and the method has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of electrochemical power sources, and in particular relates to a method for improving the superlattice structure of a sodium ion layered positive electrode material by doping elements in different valence states. Background technique [0002] As people's concerns about environmental issues and the rapid consumption of fossil fuels continue to grow, the strong demand for the utilization of renewable energy and the promotion of smart grids in modern society has promoted the development of advanced energy storage technologies, and the demand for large-scale electrochemical energy storage systems is in has received considerable attention in the past few decades. Among various electrical energy storage systems, rechargeable batteries are considered to be one of the most typical representatives of advanced energy storage technologies due to their high safety, high conversion efficiency, low cost, and environmental friendlin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/054H01M10/42
CPCH01M4/48H01M4/366H01M10/054H01M10/4235H01M4/624Y02E60/10
Inventor 姚胡蓉甘露袁新光
Owner FUJIAN NORMAL UNIV
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