Hydro-thermal synthesis method for positive material for lithium ion batteries by using siderite

A technology for lithium ion batteries and positive electrode materials, applied in the field of electrochemistry, can solve the problems of high risk factor, difficult operation, containing impurity elements, long process, etc., and achieves the effects of high safety factor, improved electrical conductivity, and reduced cost.

Active Publication Date: 2018-02-23
SHANDONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] 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 impurity elements, the present invention provides a method for hydrothermally synthesizing lithium-ion battery cathode materials using siderite method

Method used

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  • Hydro-thermal synthesis method for positive material for lithium ion batteries by using siderite
  • Hydro-thermal synthesis method for positive material for lithium ion batteries by using siderite
  • Hydro-thermal synthesis method for positive material for lithium ion batteries by using siderite

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Embodiment 1

[0029] Embodiment one is example with the siderite that contains 1mol iron carbonate, and the concentration of phosphoric acid is 3mol / L, and concrete preparation method is:

[0030] Step 1: Dissolving Siderite

[0031] 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, the reaction temperature is 70°C, and the reaction time is 2 hours. After fully reacting, filter to obtain the iron solution. The chemical reaction formula is:

[0032] FeCO 3 +2H 3 PO 4 = Fe 2+ +2(H 2 PO 4 ) - +H 2 O+CO 2

[0033] The second step: the solution of iron and lithium hydroxide hydrothermal reaction

[0034] According to the molar ratio of iron to lithium hydroxide is 1:4, 4moL lithium hydroxide is directly added to the iron solution, and lithium iron phosphate is precipitated after fully reacting under hydrothermal conditions, and then filtered to obtain iron phosphate, the positive electrode material of li...

Embodiment 2

[0036] The scanning electron microscope and X-ray powder diffraction pattern of the lithium iron phosphate prepared in embodiment two are shown in Figure 1-2 .

[0037]With the lithium iron phosphate prepared in Example 2 as the positive electrode and the graphite as the negative electrode, the battery voltage can be made into 3V, and the capacity of the 18650 battery is 1300mA h lithium-ion battery.

[0038] Embodiment two

[0039] Embodiment two is example with the siderite that contains 1mol iron carbonate, and the concentration of phosphoric acid is 0.2mol / L, and concrete preparation method is:

[0040] Step 1: Dissolving Siderite

[0041] According to the molar ratio of iron and phosphorus is 2:8, directly add H 3 PO4 is calculated as 4mol phosphoric acid, the reaction temperature is 50°C, and the reaction time is 5h. After fully reacting, filter to obtain the iron solution. The chemical reaction formula is:

[0042] FeCO 3 +2H 3 PO 4 = Fe 2+ +2(H 2 PO 4 ) -...

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Abstract

The invention discloses a hydro-thermal synthesis method for a positive material for lithium ion batteries by using siderite. The hydro-thermal synthesis method comprises the following steps: firstlydissolving siderite into dilute phosphoric acid to obtain an iron solution, and then carrying out a hydrothermal reaction on the iron solution and lithium hydrate to obtain the positive material for lithium ion batteries such as lithium iron phosphate. According to the hydro-thermal synthesis method, phosphoric acid is directly added into siderite, iron of siderite is directly dissolved into phosphoric acid by controlling the concentration of phosphoric acid and the temperature and the time of the reactor, then hydrogen peroxide is added to obtain lithium iron phosphate through the hydrothermal reaction, the lithium iron phosphate after the reaction exists in a sediment form, and the positive material for lithium ion batteries such as lithium iron phosphate can be obtained through direct filtering, so that the working procedure of leaching iron in siderite by using hydrochloric acid or sulfuric acid in advance is omitted, the cost is reduced, other impurities unbeneficial to battery performances are not introduced, and the electrical conductivity of the batteries 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): H01M4/525
CPCH01M4/525Y02E60/10
Inventor 谷亦杰钱德来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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