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Preparation method of modified manganese oxide material for lithium ion batteries

A lithium-ion battery and manganese oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low cost, high working voltage, capacity attenuation, etc., and achieve overall valence improvement, integrity assurance, and expansion coefficient reduction Effect

Active Publication Date: 2015-04-15
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Because spinel LiMn 2 o 4 It has the advantages of low cost, easy synthesis, high working voltage, high safety performance, no pollution to the environment, and high capacity. It is considered to be a very promising cathode material for lithium-ion power batteries, but LiMn 2 o 4 The capacity attenuation problem has always been the bottleneck restricting its large-scale application

Method used

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  • Preparation method of modified manganese oxide material for lithium ion batteries
  • Preparation method of modified manganese oxide material for lithium ion batteries
  • Preparation method of modified manganese oxide material for lithium ion batteries

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Effect test

Embodiment 1

[0028] Step 1, liquid-phase two-stage synthesis method to prepare the precursor: manganese sulfate and aluminum nitrate are prepared in a 0.2 mol / L aqueous solution at a molar ratio of 37:3, and sodium carbonate is separately prepared in a 0.2 mol / L aqueous solution. The temperature was controlled at 0°C, and the two groups of solutions were reacted for 5 hours by co-precipitation method, and then gradually heated to 80°C for 5 hours, filtered and dried to obtain white manganese carbonate powder as a modified precursor.

[0029] Step 2, oxidation in high-temperature air: Calcining the obtained precursor manganese carbonate powder at 600°C for 5 hours to obtain spherical ionic hole structure-modified manganese oxide powder with a particle size of 1 μm to 3 μm.

[0030] The scanning electron microscope (SEM) image of the modified manganese oxide is shown in figure 1 As shown, it can be seen from the figure that the microscopic morphology is a spherical hole-like structure, and t...

Embodiment 2

[0036] Step 1, preparation of precursor by liquid-phase two-stage synthesis method: Manganese sulfate and aluminum nitrate are prepared in a 0.5 mol / L aqueous solution at a molar ratio of 39:1, and sodium carbonate is separately prepared in a 0.5 mol / L aqueous solution. The temperature was controlled at 3°C, and the two groups of solutions were reacted for 4 hours by co-precipitation method, and then gradually heated to 100°C for 4 hours, filtered and dried to obtain white manganese carbonate powder as a modified precursor.

[0037] Step 2, oxidation in high temperature air: calcining the obtained precursor manganese carbonate powder at a temperature of 650°C for 2 hours to obtain spherical ionic hole structure-modified manganese oxide powder with a particle size of 1 μm to 3 μm.

Embodiment 3

[0039]Step 1, preparation of precursor by liquid-phase two-stage synthesis method: Manganese sulfate and aluminum nitrate are prepared in a 0.3 mol / L aqueous solution at a molar ratio of 9:1, sodium carbonate is separately prepared in a 0.3 mol / L aqueous solution, and the two sets of solutions are The temperature was controlled at 10°C, and the two groups of solutions were reacted for 8 hours by co-precipitation method, and then gradually heated to 90°C for 8 hours, filtered and dried to obtain white manganese carbonate powder as a modified precursor.

[0040] Step 2, oxidation in high temperature air: calcining the obtained precursor manganese carbonate powder at a temperature of 700°C for 4 hours to obtain spherical ionic hole structure modified manganese oxide powder with a particle size of 1 μm to 3 μm.

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Abstract

The invention discloses a preparation method of a modified manganese oxide material for lithium ion battery positive pole materials, which comprises the following steps: 1. preparing manganese source compound and aluminum salt in a mol ratio of 39:1-9:1 into a 0.2-0.5 mol / L water solution, independently preparing carbonate into a 0.2-0.5 mol / L water solution, reacting the two solutions for 4-8 hours by a coprecipiation process while controlling the temperature of the two solutions at -5-10 DEG C, gradually heating to 80-100 DEG C to react for 4-8 hours, filtering, and drying to obtain aluminum-doped precursor manganese carbonate powder; and 2. calcining the obtained precursor manganese carbonate powder at 600-800 DEG C for 2-5 hours to obtain the spherical-ion pore-structure modified manganese oxide of which the particle size is 1-3 mu m. The preparation method disclosed by the invention has the advantages of cheap and accessible raw materials, uniform microstructure and favorable doping effect, and has an auxiliary function on the subsequent synthetic structure of the lithium ion battery positive pole material.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and relates to a preparation method of a modified precursor material for lithium ion battery cathode materials, in particular to a preparation method of a modified manganese oxide material for lithium ion battery cathode materials. technical background [0002] As the energy crisis continues to intensify and oil prices soar, a new lithium-ion battery application field with a larger market capacity is rapidly forming, represented by automotive power batteries, and lithium-ion batteries are facing a greater opportunity for rapid development. The development of power vehicles is the development direction of my country's automobile industry. The core of electric vehicles is the power battery. The development of safe and high-performance lithium-ion batteries to replace nickel-metal hydride batteries is the development direction and inevitable trend of automotive power batteries, and is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505
CPCY02E60/122Y02E60/10
Inventor 俞超汤卫平王梦微
Owner SHANGHAI INST OF SPACE POWER SOURCES
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