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A kind of method for preparing olivine type sodium iron phosphate by electrochemical method

An olivine-type, sodium iron phosphate technology, applied in chemical instruments and methods, electrochemical generators, inorganic chemistry, etc., can solve the problems of poor stability and reproducibility, expensive electrolytes and solvents, and material structure damage, and achieves Fast compositing, easy-to-control, cheap compositing effects

Active Publication Date: 2018-11-23
SHENZHEN JANAENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them: the electrochemical redox method is prepared by an organic electrolyte containing lithium or sodium salt. Strong oxidizing oxidant, violent reaction, will cause certain damage to the structure of the material, and the cost of the oxidizing agent used is high, the process is complicated, and the stability and reproducibility are poor

Method used

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  • A kind of method for preparing olivine type sodium iron phosphate by electrochemical method
  • A kind of method for preparing olivine type sodium iron phosphate by electrochemical method
  • A kind of method for preparing olivine type sodium iron phosphate by electrochemical method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Obtaining of lithium iron phosphate material: olivine-type lithium iron phosphate is synthesized by high-temperature solid-state sintering method.

[0023] Electrolyte preparation:

[0024] Weigh 12.796g of lithium sulfate monohydrate, add it to 100ml of deionized water, stir to dissolve, and blow in N 2 , to avoid the influence of dissolved oxygen, that is, to get 1M Li 2 SO 4 aqueous solution.

[0025] Weigh 14.204g of sodium sulfate, add 100ml of deionized water, stir to dissolve, and blow in N 2 , to avoid the influence of dissolved oxygen, that is, to get 1M Na 2 SO 4 aqueous solution.

[0026] Weigh 1.680g of sodium hexafluorophosphate, add it to 10ml of ethylene carbonate / propylene carbonate (volume ratio = 1:1), and dissolve to obtain 1M NaPF 6 organic electrolyte.

[0027] Electrochemical synthesis of olivine-type sodium iron phosphate:

[0028] Put the olivine-type lithium iron phosphate electrode and a graphite electrode into the tank containing lith...

Embodiment 2

[0032] Obtaining of lithium iron phosphate material: olivine-type lithium iron phosphate is synthesized by hydrothermal method.

[0033] Electrolyte preparation:

[0034] Weigh 0.6895g of lithium nitrate, add it to 100ml of deionized water, stir to dissolve, and blow in N 2 , to avoid the influence of dissolved oxygen, that is, to get 0.1M LiNO 3 aqueous solution.

[0035]Weigh 0.8499g of sodium nitrate, add 100ml of deionized water, stir to dissolve, and blow in N 2 , to avoid the influence of dissolved oxygen, that is, to get 0.1M NaNO 3 aqueous solution.

[0036] Electrochemical synthesis of sodium iron phosphate:

[0037] Put the lithium iron phosphate electrode and an iron phosphate electrode into the tank filled with the above-mentioned lithium-containing electrolyte. The lithium iron phosphate electrode is connected to the working electrode of the potentiostat, and the iron phosphate electrode is connected to the counter electrode. The silver / silver chloride electr...

Embodiment 3

[0040] Obtaining of lithium iron phosphate material: olivine-type lithium iron phosphate is synthesized by carbothermal reduction method.

[0041] Electrolyte preparation:

[0042] Weigh 9.576g of lithium hydroxide, add it to 100ml of deionized water, stir to dissolve, and blow in N 2 , to avoid the influence of dissolved oxygen, that is, to obtain 4M LiOH aqueous solution.

[0043] Weigh 16g of sodium hydroxide, add 100ml of deionized water, stir to dissolve, and blow in N 2 , to avoid the influence of dissolved oxygen, that is, to obtain 4M NaOH aqueous solution.

[0044] Electrochemical synthesis of sodium iron phosphate:

[0045] Put the lithium iron phosphate electrode and an iron phosphate electrode into the tank filled with the above-mentioned lithium-containing electrolyte. The lithium iron phosphate electrode is connected to the working electrode of the potentiostat, and the iron phosphate electrode is connected to the counter electrode. The silver / silver chloride ...

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Abstract

The invention discloses an electrochemical preparation technology of an anode material of a sodium ion battery and particularly relates to a method of preparing olivine-type sodium ferric phosphate through an electrochemical method. The method aims to the olivine-type sodium ferric phosphate material which is difficult to synthesize through a high-temperature method in the prior art. Through an electrochemical oxidation-reduction method, a lithium iron phosphate material is oxidized to delithiate the material to obtain the olivine-type ferric phosphate in a lithium-containing aqueous solution electrolyte, and then the ferric phosphate is reduced to embedded sodium to obtain the olivine-type sodium ferric phosphate in a sodium-containing aqueous solution electrolyte. The method is advantaged in that the lithium iron phosphate material is subjected to electrochemical oxidation-reduction under the condition of the aqueous solution electrolyte, so that the method is free of an organic electrolyte and other complex chemical processes and can be used for prepare pure olivine-type sodium ferric phosphate. The method achieves simple, quick and low-cost synthesis of the olivine-type sodium ferric phosphate, is an economic and practical technical method, is simple in process, is easy to control, and has significant practical value and excellent application prospect.

Description

technical field [0001] The invention relates to a method for electrochemically preparing olivine-type sodium iron phosphate, which belongs to the field of energy materials and technology. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products such as notebook computers, mobile phones, and digital cameras due to their high specific capacity, long cycle life, wide operating temperature range, small self-discharge, and no memory effect. With the development of the economy and the development of global resources, the demand for lithium has greatly increased. However, whether the resource reserves of lithium on the earth can support large-scale energy storage applications is still a controversial issue. Sodium is abundant in the Earth's crust, and seawater also contains large amounts of sodium. Sodium-ion batteries are becoming an emerging hotspot in the field of advanced energy storage technology, with the characteristics of extensiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B25/45
CPCC01B25/45H01M4/5825H01M10/0525Y02E60/10
Inventor 曹余良方永进杨汉西艾新平
Owner SHENZHEN JANAENERGY TECH CO LTD
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