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Preparation method of iron-containing lithium-rich manganese-based positive electrode material

A cathode material, lithium-rich manganese-based technology, applied in the field of lithium ion cathode materials and electrochemistry, can solve the problems of high equipment requirements, high operating temperature, hindering the promotion of iron-containing lithium-rich manganese-based cathode materials, etc., to meet the needs of large-scale requirements, the effect of reducing production costs

Inactive Publication Date: 2012-12-26
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As we all know, the hydrothermal synthesis process requires high equipment, high operating temperature, relatively high energy consumption, and low output, so the process cost is high, which in turn increases the synthesis cost of iron-containing lithium-rich manganese-based cathode materials, hindering the development of iron-containing lithium-rich manganese-based cathode materials. Material promotion

Method used

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  • Preparation method of iron-containing lithium-rich manganese-based positive electrode material
  • Preparation method of iron-containing lithium-rich manganese-based positive electrode material
  • Preparation method of iron-containing lithium-rich manganese-based positive electrode material

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Embodiment 1

[0025] FeSO 4 ·7H 2 O and MnSO 4 ·H 2 O is dissolved in deionized water at a molar percentage of 1:3, and the concentration of the mixed solution is 1.0 mol / L; prepare a precipitant with the same volume as the sulfate mixed solution, with a concentration of 2 mol / L NaOH solution, and add a small amount of Ammonia water, the concentration of ammonia water is 0.1 mol / L. Add 800 ml of deionized water to a 2 L beaker, maintain the temperature at 50 °C, and use an electric stirrer to continuously stir the deionized water, then pump the sulfate mixed solution and precipitant into the deionized water at a flow rate of 10 ml / min at the same time , for co-precipitation reaction. The resulting coprecipitate was washed, filtered and dried to obtain the precursor. According to the molar ratio of lithium to iron and manganese molar ratio of 1.7:1, the lithium hydroxide is mixed with the precursor evenly. Finally, the mixture of lithium hydroxide and the precursor was kept in a tubula...

Embodiment 2

[0027] FeSO 4 ·7H 2 O and MnSO 4 ·H 2 O is dissolved in deionized water at a molar percentage of 1:3, and the concentration of the mixed solution is 1.0 mol / L; the precipitant with the same volume as the sulfate mixed solution is prepared, and the concentration is 1 mol / L of Na 2 CO 3 solution. Add 800 ml of deionized water to a 2 L beaker, maintain the temperature at 50 °C, and use an electric stirrer to continuously stir the deionized water, then pump the sulfate mixed solution and precipitant into the deionized water at a flow rate of 10 ml / min at the same time , for co-precipitation reaction. The resulting coprecipitate was washed, filtered and dried to obtain the precursor. According to the molar ratio of lithium to iron and manganese molar ratio of 1.7:1, the lithium hydroxide is mixed with the precursor evenly. The mixture of lithium hydroxide and precursor is kept in a tubular calciner at 500 °C for 5 hours, then the temperature is raised to 600 °C, kept at 12 h...

Embodiment 3

[0029] FeSO 4 ·7H 2 O and MnSO 4 ·H 2 O and NiSO 4 ·6H 2 The total number of moles of O is dissolved in deionized water at a molar percentage of 1:3, and the concentration of the mixed solution is controlled at 1.0 mol / L; a precipitant with the same volume as the sulfate mixed solution is prepared, and the concentration is 2 mol / L of NaOH solution. A small amount of ammonia water was added to the solution, and the concentration of ammonia water was 0.1 mol / L. Add 800 ml of deionized water into a 2 L beaker, keep the temperature at 60 °C, and use an electric stirrer to continuously stir the deionized water, then pump the sulfate mixed solution and precipitant into the deionized water at a flow rate of 10 ml / min at the same time , for co-precipitation reaction. The resulting coprecipitate was washed, filtered and dried to obtain the precursor. According to the ratio of moles of lithium to moles of iron and manganese of 1.55:1, lithium hydroxide is mixed with the precursor...

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Abstract

The invention discloses a preparation method of iron-containing lithium-rich manganese-based positive electrode material, falling into the technical field of positive electrode material of lithium ion secondary battery. The preparation method adopting ''co-precipitation, mixing and calcining'' process includes co-precipitating mixed solution of soluble iron salt and other transition metal salt with precipitant, to form a precursor; mixing the precursor with lithium compound; and directly calcining to obtain the positive electrode material. The method obviates a hydrothermal process in existing ''co-precipitation, mixing, hydrothermal synthesis, and calcining'' process, to lower production cost.

Description

technical field [0001] The invention belongs to the field of lithium ion positive electrode materials and electrochemistry, and in particular relates to a preparation method of an iron-containing lithium-rich manganese-based positive electrode material. Background technique [0002] Among the current commercial secondary chemical power sources (such as: lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries), lithium-ion secondary batteries have relatively high energy density and are widely used in portable communication equipment, notebook computers, media equipment, Small equipment such as portable power tools. In recent years, with the commercialization of high-end smartphones and electric vehicles, the energy density of lithium-ion batteries in the market has been severely challenged, and it is imminent to further increase the energy density of lithium-ion batteries. The use of positive electrode materials with higher energy density is the best ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 刘恒刘国标石云凤彭磊磊陈琛
Owner SICHUAN UNIV
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