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Nano-scaled materials ZnMn2O4 for lithium storage and preparation thereof

A nanometer, lithium storage technology, applied in manganate/permanganate and other directions, can solve the problems of high cost, cobalt toxicity and price, and achieve the effect of low cost, high specific capacity and good dispersibility

Inactive Publication Date: 2010-08-25
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cobalt has certain toxicity and is expensive, so cheap and environmentally friendly electrode materials (such as manganese-based oxides) have better application prospects
At present, there are very few reports on manganese-based oxide lithium storage materials. Pasero et al. 3 o 4 The low potential electrochemical performance of ZnMn 2 o 4 The synthesis and application in lithium batteries have not been reported yet

Method used

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  • Nano-scaled materials ZnMn2O4 for lithium storage and preparation thereof
  • Nano-scaled materials ZnMn2O4 for lithium storage and preparation thereof
  • Nano-scaled materials ZnMn2O4 for lithium storage and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 18.9 grams of zinc nitrate and 35.8 grams of manganese nitrate, add them to 43.2 grams of acrylic acid, and form a homogeneous solution by magnetic stirring, wherein the molar ratio of zinc nitrate, manganese nitrate and acrylic acid is 1:2:6. Add 0.1 ml of 5% ammonium persulfate solution as an initiator into the above solution, mix evenly, and let it stand at 80° C. for 2 hours, so that the polymerization reaction can fully proceed to generate a polyacrylate precursor. Then the polyacrylate precursor was dried at 120°C for 24 hours, and then calcined at 600°C for 6 hours to obtain a brown powder product ZnMn 2 o 4 .

Embodiment 2

[0024] Weigh 13.6 grams of zinc chloride and 34.6 grams of manganese acetate, add them to 72 grams of acrylic acid, and form a homogeneous solution by magnetic stirring, wherein the molar ratio of zinc chloride, manganese acetate and acrylic acid is 1:2:10. Add 0.5 ml of 5% ammonium persulfate solution as an initiator into the above solution, mix evenly, and let stand at 80° C. for 2 hours to fully proceed the polymerization reaction and generate a polyacrylate precursor. Then the polyacrylate precursor was dried at 120°C for 24 hours, and then calcined at 700°C for 6 hours to obtain a brown powder product ZnMn 2 o 4 .

Embodiment 3

[0026] Weigh 28.7 grams of zinc sulfate and 35.8 grams of manganese nitrate, add them to 57.6 grams of acrylic acid, and form a homogeneous solution by magnetic stirring, wherein the molar ratio of zinc sulfate, manganese nitrate and acrylic acid is 1:2:8. Add 0.3 ml of 5% ammonium persulfate solution as an initiator into the above solution, mix evenly, and let stand at 80° C. for 2 hours to fully proceed the polymerization reaction and generate a polyacrylate precursor. Then the polyacrylate precursor was dried at 120°C for 24 hours, and then calcined at 500°C for 8 hours to obtain a brown powder product ZnMn 2 o 4 .

[0027] Obtained sample is observed through transmission electron microscope (JEM-2010FEF) (see Fig. 1), and the particle size of nanoparticle is 30~60 nanometers, and the dispersibility of material is better; The obtained sample is tested by XRD (Shimadzu XRD-6000), and diffraction The characteristic peaks in the spectrum (see Figure 2) coincide with the peak...

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Abstract

The invention provides a nano lithium storage material ZnMn2O4 which is used as the cathode material of lithium ion batteries and pertains to the technical field of high energy batteries. The method is characterized in that: the nano material ZnMn2O4 with the grain size of 30 to 60nm produced by adopting a polymerization and pyrolysis method has high purity and good granule dispersion property. According to an electrochemical performance test, the first cycle charge capacity of the nano material is up to 776mAh / g and the capacity can keep good stability after ten cycles of circulation. The nano lithium storage material ZnMn2O4 has simple technique and low cost, and is environment-friendly and has relatively good electrochemical performance, thereby conforming to actual production needs.

Description

technical field [0001] The invention relates to a novel nanometer lithium storage material ZnMn 2 o 4 The invention and a preparation method thereof belong to the technical field of high-energy batteries. Background technique [0002] In recent years, nanomaterial metal oxides (such as M x o y , M=Fe, Co, Ni, Cu...) and their composite oxides, as negative electrode materials for lithium-ion batteries, have received widespread attention. Since Tarason et al. found that these metal oxides can reversibly react with lithium metal and have a stable specific capacity (for example, CuO maintains a high specific capacity of 700 mAh / g during charge-discharge cycles). Moreover, the reaction mechanism of lithium metal with these transition metal oxides is different from the traditional mechanism, namely the intercalation / extraction of lithium ions or the formation of alloys. Nano-metal particles formed by the reaction of metal oxides and lithium are dispersed in the amorphous Li ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/12
Inventor 张礼知杨艳艳肖利芬
Owner HUAZHONG NORMAL UNIV