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Nano-scaled materials ZnMn2O4 for lithium storage and preparation thereof

A lithium storage and nano technology, applied in manganate/permanganate and other directions, can solve the problems of high cost and cobalt toxicity, and achieve the effects of low cost, high specific capacity and stable charge-discharge cycle performance.

Inactive Publication Date: 2008-10-01
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] 18.9 grams of zinc nitrate and 35.8 grams of manganese nitrate were weighed, added to 43.2 grams of acrylic acid, and a homogeneous solution was formed by magnetic stirring, wherein the molar ratio of zinc nitrate, manganese nitrate and acrylic acid was 1:2:6. 0.1 ml of 5% ammonium persulfate solution was added to the above solution as an initiator, and after mixing uniformly, it was allowed to stand at 80° C. for 2 hours to make the polymerization reaction fully proceed to generate a polyacrylate precursor. The polyacrylate precursor was then dried at 120°C for 24 hours, followed by calcination at 600°C for 6 hours to obtain a brown powder product, ZnMn 2 O 4 .

Embodiment 2

[0024] 13.6 grams of zinc chloride and 34.6 grams of manganese acetate were weighed, added to 72 grams of acrylic acid, and a homogeneous solution was formed by magnetic stirring, wherein the molar ratio of zinc chloride, manganese acetate and acrylic acid was 1:2:10. 0.5 ml of 5% ammonium persulfate solution was added to the above solution as an initiator, and after mixing uniformly, it was allowed to stand at 80° C. for 2 hours to make the polymerization reaction fully proceed to form a polyacrylate precursor. The polyacrylate precursor was then dried at 120°C for 24 hours, followed by calcination at 700°C for 6 hours to obtain ZnMn as a brown powder product 2 O 4 .

Embodiment 3

[0026] 28.7 grams of zinc sulfate and 35.8 grams of manganese nitrate were weighed, added to 57.6 grams of acrylic acid, and a homogeneous solution was formed by magnetic stirring, wherein the molar ratio of zinc sulfate, manganese nitrate and acrylic acid was 1:2:8. 0.3 ml of 5% ammonium persulfate solution was added to the above solution as an initiator, and after mixing uniformly, it was allowed to stand at 80° C. for 2 hours, so that the polymerization reaction was fully carried out, and a polyacrylate precursor was formed. The polyacrylate precursor was then dried at 120°C for 24 hours, followed by calcination at 500°C for 8 hours to obtain a brown powder product, ZnMn 2 O 4 .

[0027] The obtained samples were observed by transmission electron microscopy (JEM-2010FEF) (see figure 1 ), the particle size of the nanoparticles is 30-60 nanometers, and the dispersibility of the material is good; the obtained sample was tested by XRD (Shimadzu XRD-6000), and the diffraction ...

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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 the 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 are capable of reversibly reacting with metallic lithium and have stable specific capacities (eg, CuO maintains a high specific capacity of 700 mAh / g during charge-discharge cycles). Moreover, the reaction mechanism of metallic lithium with these transition metal oxides is different from the conventional mechanism, namely the intercalation / extraction of lithium ions or the formation of alloys. Nano-metal particles formed by the reaction of metal oxides with lithium are dispersed in amor...

Claims

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Application Information

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IPC IPC(8): C01G45/12
Inventor 张礼知杨艳艳肖利芬
Owner HUAZHONG NORMAL UNIV
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