A kind of method adopting siderite to prepare high-density lithium iron phosphate

A technology of lithium iron phosphate and siderite, applied in the field of electrochemistry, can solve the problems of high risk factor, difficult operation, containing impurity elements, low synthesis efficiency, etc., so as to save energy-consuming steps, improve electrical conductivity, and improve energy density. Effect

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

[0009] In order to overcome the technical defects of the existing technology for preparing lithium iron phosphate, such as long process, low synthesis efficiency, high risk factor, difficult operation, and containing impurity elements, and at the same time, in order to increase the density of lithium iron phosphate so as to increase the capacity of lithium ion batteries, the present invention Provide a kind of method that utilizes siderite to prepare positive electrode material of lithium ion battery

Method used

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  • A kind of method adopting siderite to prepare high-density lithium iron phosphate
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  • A kind of method adopting siderite to prepare high-density lithium iron phosphate

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Embodiment 1

[0035] 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:

[0036] Step 1: Dissolving Siderite

[0037] According to the molar ratio of iron and pure phosphoric acid is 2:7, directly add H 3 PO is calculated as 3.5 mol of phosphoric acid. At this time, the reaction temperature is 40°C, and the reaction time is 5 hours. After fully reacting, an iron solution is obtained;

[0038] The second step: the iron solution is mixed with P(DMDAAC-AM)

[0039] Add the iron solution obtained in the first step into the P(DMDAAC-AM) solution and stir well to make the two mix evenly. The mass ratio of siderite to P(DMDAAC-AM) is required to be 10:1;

[0040] The third step: the iron solution reacts with hydrogen peroxide

[0041] According to the molar ratio of iron to pure hydrogen peroxide is 2:1, add H 2 o 2 Calculated a...

Embodiment 2

[0046] Embodiment two is example with 1mol siderite (in iron carbonate), the concentration of phosphoric acid is 0.3mol / L, and the concentration of hydrogen peroxide is 20wt%, and concrete preparation method is:

[0047] Step 1: Dissolving siderite.

[0048] According to the molar ratio of iron to pure phosphoric acid is 2:4, directly add H 3 PO is calculated as 2 mol of phosphoric acid, and the concentration of phosphoric acid is 0.3 mol / L. At this time, the reaction temperature is 70°C, and the reaction time is 3 hours. After fully reacting, an iron solution is obtained;

[0049] The second step: the iron solution is mixed with P(DMDAAC-AM)

[0050] Add the iron solution obtained in the first step into the P(DMDAAC-AM) solution and stir well to make the two evenly mixed. The mass ratio of siderite to P(DMDAAC-AM) is required to be 20:1.

[0051] The third step: the iron solution reacts with hydrogen peroxide.

[0052] According to the molar ratio of iron to pure hydrogen ...

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Abstract

The invention discloses a method for preparing high-density lithium iron phosphate by using siderite. First, phosphoric acid is directly added to the siderite to obtain an iron solution, and the iron solution is mixed with a polymer copolymer P (DMDAAC-AM). Hydrogen peroxide is added to the mixed solution to fully react to obtain iron phosphate dihydrate as a precursor of lithium iron phosphate, and then the iron phosphate dihydrate is mixed with lithium carbonate and glucose and sintered to obtain lithium iron phosphate. The raw material that the present invention utilizes is siderite, and siderite is a kind of widely distributed mineral, can be used as iron ore to extract iron, directly synthesizes the precursor ferric phosphate dihydrate with siderite, not only saves iron ore The energy-consuming step of extracting iron from ore achieves the purpose of directly obtaining the positive electrode material of lithium-ion batteries from nature, and siderite is easier to react with phosphoric acid than iron powder, 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 lithium-ion sub-battery cathode materials 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 application number 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/0525C01B25/37C01B25/45C01B25/26
CPCC01B25/26C01B25/375C01B25/45H01M4/5825H01M10/0525Y02E60/10
Inventor 谷亦杰秦文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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