A kind of method utilizing siderite to prepare positive electrode material of lithium ion battery

A lithium-ion battery and cathode material technology, applied in the field of electrochemistry, can solve the problems of high risk factor, long process, and low synthesis efficiency, and achieve the effects of high safety factor, cost reduction, and easy operation

Active Publication Date: 2020-04-28
SHANDONG UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

[0007] In order to overcome the technical defects of the existing technology for preparing lithium iron phosphate, such as long process, high risk factor, low synthesis efficiency, difficult operation and containing impurity elements, the present invention provides a method for preparing lithium-ion battery cathode materials using siderite

Method used

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  • A kind of method utilizing siderite to prepare positive electrode material of lithium ion battery
  • A kind of method utilizing siderite to prepare positive electrode material of lithium ion battery
  • A kind of method utilizing siderite to prepare positive electrode material of lithium ion battery

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Embodiment 1

[0031] Embodiment one is example with the siderite that contains 1mol iron carbonate, the concentration of phosphoric acid is 0.2mol / L, and the concentration of hydrogen peroxide is 10wt%, and concrete preparation method is:

[0032] Step 1: Dissolving Siderite

[0033] According to the molar ratio of iron and pure phosphoric acid is 2:7, directly add H 3 PO 4 Calculated as 3.5mol of phosphoric acid, the reaction temperature is 40°C and the reaction time is 5h. After the reaction is complete, the iron solution is obtained;

[0034] The second step: the iron solution reacts with hydrogen peroxide

[0035] According to the molar ratio of iron to pure hydrogen peroxide is 2:1, add H 2 o 2 Calculated as 0.5mol of hydrogen peroxide, the concentration of hydrogen peroxide is 10wt%, the reaction temperature is 70°C, and the reaction time is 3h. After fully reacting, filter, wash with deionized water, and dry to obtain the precursor ferric phosphate dihydrate;

[0036] The third ...

Embodiment 2

[0039] Embodiment two is example with the siderite that contains 1mol iron carbonate, and the concentration of phosphoric acid is 0.3mol / L, and the concentration of hydrogen peroxide is 20wt%, and concrete preparation method is:

[0040] Step 1: Dissolving siderite.

[0041] According to the molar ratio of iron to pure phosphoric acid is 2:4, directly add H 3 PO 4 Calculated as 2 mol of phosphoric acid, the concentration of phosphoric acid is 3 mol / L, the reaction temperature is 70°C, and the reaction time is 3 hours. After fully reacting, an iron solution is obtained;

[0042] The second step: the iron solution reacts with hydrogen peroxide.

[0043] According to the molar ratio of iron to pure hydrogen peroxide is 2:1.5, add H 2 o 2 Calculated as 0.75mol of hydrogen peroxide, the reaction temperature is 90°C, and the reaction time is 1h. After fully reacting, filter, wash with deionized water, and dry to obtain the precursor ferric phosphate dihydrate;

[0044] The thir...

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Abstract

The invention discloses a method for preparing positive electrode materials of lithium ion batteries by using siderite. Firstly, siderite is dissolved in low-concentration phosphoric acid, and then hydrogen peroxide is added to the solution to obtain the precursor ferric phosphate dihydrate, dihydrate Iron phosphate is then mixed with lithium carbonate and glucose and sintered to obtain lithium iron phosphate. The present invention uses siderite to directly synthesize the precursor ferric phosphate dihydrate, which not only saves the energy-consuming steps of extracting iron from iron ore, but also realizes the purpose of directly obtaining the positive electrode material of lithium ion battery from nature, and siderite is relatively For powder, it is easier to react with phosphoric acid, which improves the feasibility of the reaction.

Description

technical field [0001] The invention belongs to the field of electrochemistry, in particular to a method for preparing positive electrode materials of lithium ion batteries by using siderite. Background technique [0002] Lithium-ion battery is a new generation of green high-energy battery with excellent performance, which has become one of the focuses of high-tech development, and the synthesis method of lithium iron phosphate as the cathode material of lithium-ion battery is the top priority in the development. At present, the method of using siderite to synthesize lithium iron phosphate battery is to dissolve siderite with sulfuric acid, hydrochloric acid or nitric acid, then add oxidant and phosphoric acid or phosphate to react to generate iron phosphate, the precursor of lithium ion battery positive electrode material, and then combine iron phosphate with Lithium carbonate and C are sintered to form lithium iron phosphate. for example: [0003] Chinese patent applicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 谷亦杰王娟陈蕴博刘成全王海峰刘洪权陈林王萌
Owner SHANDONG UNIV OF SCI & TECH
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