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Method for preparing multielement positive pole material for sodium-ion batteries

A technology for sodium ion batteries and cathode materials, which is applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problems of limited mixing uniformity of raw materials, long heat treatment time, high heat treatment temperature, etc., to ensure batch stability, Simple process and the effect of reducing synthesis temperature

Inactive Publication Date: 2016-05-11
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the synthesis of multi-component materials mostly adopts the method of ball milling and mixing. Although this process is simple to operate, the ball milling time is long, the energy consumption is high, and the degree of uniformity of raw material mixing is limited. Therefore, higher heat treatment temperature and longer heat treatment time are required. , the products also have big differences in terms of composition and structure.

Method used

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  • Method for preparing multielement positive pole material for sodium-ion batteries
  • Method for preparing multielement positive pole material for sodium-ion batteries

Examples

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Effect test

Embodiment 1

[0029] See attached figure 1 and figure 2 .

[0030] A preparation method for a sodium-ion battery multi-element positive electrode material, comprising the following process steps:

[0031] The multicomponent cathode material prepared in this example is Na 0.67 Ni 0.33 Fe 0.33 mn 0.34 o 2 . First, weigh nickel carbonate, ferrous oxalate, manganese carbonate and sodium sources according to the atomic ratio of the metals. Wherein the sodium source is a mixture of sodium hydroxide and sodium nitrate (sodium hydroxide: sodium nitrate=1:2). Put the weighed raw materials into a double-helix conical mixer, and mix them initially for 0.1h. The primary mixed raw materials are sprayed into the closed air tank through the Venturi nozzle, and the materials are collected by the cyclone dust collector. Put the mixed and activated raw material into a muffle furnace, raise it to 875°C at a speed of 15°C / min in an air atmosphere, keep it warm for 20 hours, and then cool it to room ...

Embodiment 2

[0033] A preparation method for a sodium-ion battery multi-element positive electrode material, comprising the following process steps:

[0034] The multicomponent cathode material prepared in this example is Na 0.67 Ni 0.5 Fe 0.2 mn 0.3 o 2 . First, weigh nickel acetate, iron nitrate, manganese acetate and sodium hydroxide according to the metal atomic ratio, put the weighed raw materials into a double-helix conical mixer, and mix them for 0.2 hours. The primary mixed raw materials are sprayed into the closed air tank through the Laval nozzle, and the materials are collected by the cyclone dust collector. Put the mixed and activated raw materials into a muffle furnace, raise it to 900°C at a rate of 20°C / min in an air atmosphere, keep it warm for 18 hours, and then cool it to room temperature at the same speed to obtain a high-performance multi-component cathode material Na 0.67 Ni 0.5 Fe 0.2 mn 0.3 o 2 . The discharge capacity of the button battery is 174.3mAh / g, ...

Embodiment 3

[0036] A preparation method for a sodium-ion battery multi-element positive electrode material, comprising the following process steps:

[0037] The multicomponent cathode material prepared in this example is Na 0.67 Ni 0.65 Fe 0.15 mn 0.2 o 2. First, weigh oxalic acid, ferrous oxalate, manganese oxalate and sodium carbonate according to the metal atomic ratio, put the weighed raw materials into a double-helix conical mixer, and mix them for 0.3 hours. The primary mixed raw materials are sprayed into the airtight tank through the high-pressure nozzle, and the materials are collected by the non-woven fabric collection bag. Put the mixed and activated raw materials into a muffle furnace, calcinate at 450°C for 2 hours in an air atmosphere, activate and mix with a high-speed air flow again after cooling, and then raise it to 950°C at a speed of 20°C / min in an oxygen atmosphere, and keep it for 15 hours. Then cool to room temperature at the same speed, and after jet milling ...

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Abstract

The invention relates to a method for preparing a multielement positive pole material for sodium-ion batteries and belongs to the technical field of lithium-ion batteries. The method for preparing the multielement positive pole material for the sodium-ion batteries comprises the following steps: (1) weighing a nickel source compound, a ferrum source compound, a manganese source compound and a lithium source compound according to the atomic ratio of x, y and z in a chemical formula, i.e., Na(0.67)Ni(x)Fe(y)Mn(1-x-y-z)O(2) of a predetermined synthesized product, and carrying out preliminary mixing on the raw materials, wherein each of x, y and z is not smaller than 0.01 and is smaller than 1; (2) feeding the preliminary-mixed raw materials to an airtight gas tank by using high-speed gas flow, and subjecting the raw materials to mutual collision and mutual friction inside the airtight gas tank, so as to obtain a crushed, mixed and activated precursor; (3) placing the precursor, which is crushed and activated by the high-speed gas flow, into a high-temperature tunnel kiln, heating the precursor to the temperature of 875 DEG C to 950 DEG C in an air or oxygen atmosphere, carrying out heat preservation for 15 hours to 20 hours, and carrying out cooling, thereby preparing a powder product of the multielement positive pole material Na(0.67)Ni(x)Fe(y)Mn(1-x-y-z)O(2). The method has the advantages that the process is simple, the cost is low, the production efficiency is high, the uniformity of the product is good, the electrochemical properties are excellent, and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a multi-element positive electrode material for sodium ion batteries. Background technique [0002] At present, the cathode materials for lithium-ion batteries mainly include LiCoO 2 , LiNiO 2 and LiMn 2 o 4 . LiCoO 2 It is the earliest industrially produced and commercialized positive electrode material, but cobalt resources are scarce and expensive, unfriendly to the environment, and have poor safety performance, so its application is limited. LiNiO 2 Although it has the advantage of high discharge capacity, its cycle performance is poor and its synthesis is difficult, so it is difficult to be commercially applied on a large scale. LiMn 2 o 4 The source of raw materials is abundant and the price is low. But spinel LiMn 2 o 4 The presence of Jahn-Teller effect and manganese dissolution lead to fast battery capacity de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/054
CPCH01M4/505H01M4/525H01M10/054Y02E60/10
Inventor 许寒丁飞刘兴江卢志威李伟任丽彬
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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