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Zinc-ferrite-based nanometer composite as well as preparation method and application thereof

A nano-composite material and nano-particle technology, which is applied in the field of lithium-ion battery anode materials and lithium-ion batteries, can solve the problems of poor compatibility of organic electrolytes, peeling of graphite layers, and low actual capacity.

Active Publication Date: 2013-05-08
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, commercial lithium-ion batteries mainly use graphite-like carbon materials as negative electrode materials. Graphite materials have the following disadvantages: ① The theoretical specific capacity is only 372mAh / g, and the actual capacity is lower; ② It has a highly oriented layered structure, which is compatible with organic electrolytic The compatibility of the liquid is very poor: ③There is a graphite layer peeling phenomenon during the rapid charge and discharge process, resulting in capacity attenuation; ④The lithium intercalation potential is very close to the lithium precipitation potential, which is prone to lithium dendrites, causing safety hazards
Most of the materials prepared by these reports or patents are pure phase ZnFe 2 o 4 , the performance is not ideal, it is difficult to be practical, and the preparation process is relatively cumbersome

Method used

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  • Zinc-ferrite-based nanometer composite as well as preparation method and application thereof
  • Zinc-ferrite-based nanometer composite as well as preparation method and application thereof
  • Zinc-ferrite-based nanometer composite as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~4

[0070] (1) Dissolve the zinc salt and iron salt in deionized water until they are completely dissolved, then add the organic complexing agent into the iron-zinc mixed solution for constant temperature stirring to obtain a uniform slurry.

[0071] (2) Move the homogeneous slurry into the drying equipment, maintain a constant temperature in the range of 40~200°C to solidify, so that the slurry becomes a dry gel, and then cool naturally to room temperature.

[0072] (3) Move the cooled xerogel into a calcination furnace, perform constant temperature calcination in an oxidizing atmosphere at 350-850°C, and then cool naturally to room temperature to obtain ZnFe 2 o 4 / MO (MO is ZnO or Fe 2 o 3 ) nanocomposite coarse material.

[0073] (4) Move the cooled coarse material into a ball mill or pulverizer to disperse the particles, crush them, and finally sieve the powder to obtain the negative electrode material of the lithium ion battery. The negative electrode material of the lith...

Embodiment 5~13

[0082] (1) Add the complexing agent to tap water to make an organic solution, and then add the pure phase ZnFe 2 o 4 Nano-powder and MO nano-powder are added to the solution in different proportions, and dried until the water evaporates completely to obtain a dry powder.

[0083] (2) Move the dry powder into a calcination furnace, perform constant temperature calcination in an oxidizing atmosphere at 250-850°C, and then cool naturally to room temperature to obtain a ZnFe 2 o 4 Nanoparticles with MO (MO as Fe 2 o 3 , ZnO, CoO, NiO, CuO, MnO, TiO 2 , CrO 3 、VO 2 One or a combination of at least two) nanoparticles are evenly agglomerated to form a nanocomposite material.

[0084] The specific process conditions are shown in Table 2 and Table 3.

[0085] Table 2

[0086]

[0087]

[0088] table 3

[0089]

[0090]

[0091] The nanocomposites prepared in Examples 1 to 13 and Comparative Examples 1 to 4 were subjected to the following performance measurements...

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Abstract

The invention relates to a ZnFe2O4-based nanometer composite. The zinc ferrite-based nanometer composite is a ZnFe2O4 / MO nanometer composite in which MO is a metal oxide. The ZnFe2O4-based nanometer composite comprises secondary particles formed by aggregating ZnFe2O4 nanoparticles with spinel structures and MO nanoparticles; and the metal oxide is ZnO, Fe2O3, CoO, NiO, CuO, MnO, TiO2, CrO3 and / or VO2. Compared with the prior art, the zinc-ferrite-based nanometer composite has the beneficial effects that the ZnFe2O4-based nanometer composite provided by the invention has high capacity and high cycle stability as a negative electrode material of a lithium ion battery, and the electrochemical performance of pure-phase ZnFe2O4 is greatly improved; the particles are uniform in size and good in dispersion; and a preparation method of the composite is simple, a production process is short without severe conditions, the cost is low, and the industrialization is easy.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular, the invention relates to the field of lithium-ion battery negative electrode materials. Background technique [0002] Lithium-ion battery has been officially put into use as a new type of secondary battery for 20 years. It has the advantages of high voltage (4V), high energy density, small self-discharge, long cycle life, no memory effect, and no pollution. It is widely used in mobile devices such as notebook computers, mobile phones, digital cameras, and electric vehicles, but the limitations of its electrode materials restrict the rapid development of lithium-ion batteries. [0003] At present, commercial lithium-ion batteries mainly use graphite-like carbon materials as negative electrode materials. Graphite materials have the following disadvantages: ① The theoretical specific capacity is only 372mAh / g, and the actual capacity is lower; ② It has a highly oriented layered st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/48
CPCY02E60/12Y02E60/10
Inventor 李子坤黄友元
Owner BTR NEW MATERIAL GRP CO LTD
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