Method for preparing high-density lithium iron phosphate from siderite

A technology of lithium iron phosphate and siderite, which is applied in the field of electrochemistry, can solve the problems of high risk factor, difficult operation, impurity elements, and long process, so as to save energy-consuming steps, improve electrical conductivity, and reduce costs. Effect

Active Publication Date: 2018-03-30
SHANDONG UNIV OF SCI & TECH
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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

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  • Method for preparing high-density lithium iron phosphate from siderite
  • Method for preparing high-density lithium iron phosphate from siderite
  • Method for preparing high-density lithium iron phosphate from siderite

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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 from siderite. Firstly, phosphoric acid is directly added to siderite to obtain an iron solution; the iron solution and a high-molecular copolymer P (DMDAAC-AM); hydrogen peroxide is added to the mixed solution to be fully reacted to obtain lithium iron phosphate precursor iron phosphate dihydrate; and iron phosphate dihydrate is mixed with lithium carbonate and glucose, and then the mixture is sintered to obtain lithium iron phosphate. Siderite, a widely distributed mineral, is used as the raw material and canbe used as iron ore for extracting and purifying iron; siderite is adopted for directly synthesizing the precursor iron phosphate dihydrate, so that an energy consumption step of extracting and purifying iron from iron ore can be omitted, and the positive electrode material of the lithium ion battery can be obtained directly from the nature; and in addition, compared with iron powder, siderite iseasier to be reacted with phosphoric acid, so that reaction feasibility is improved.

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 Applications(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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