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Negative electrode material and preparation method and application of negative electrode material

A negative electrode material and reaction technology, which is applied in the field of negative electrode materials and its preparation, can solve the problems of unsuitable industrial production, limited capacity of negative electrode materials, and low rate performance, and achieve high specific capacity, simple preparation method, and good rate performance.

Active Publication Date: 2014-11-19
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the present invention provides a method for preparing a negative electrode material with a porous structure, an electrode sheet containing the negative electrode material, and a

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  • Negative electrode material and preparation method and application of negative electrode material
  • Negative electrode material and preparation method and application of negative electrode material
  • Negative electrode material and preparation method and application of negative electrode material

Examples

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[0027] Example one

[0028] The first step is to prepare the reaction precursor solution: dissolve component A in component B to prepare a reaction precursor solution; wherein component A includes the following raw materials in parts by weight: 14-15 parts of zinc nitrate, 18~ of iron acetylacetonate 20 parts, 2 to 3 parts of terephthalic acid, 63 to 64 parts of polyvinylpyrrolidone with a molecular weight of 30,000 to 60,000; component B is N,N-dimethylformaldehyde prepared in a volume ratio of 4:3 to 2:1 A mixed solution of amide and ethanol; in the prepared reaction precursor solution, the concentration of zinc nitrate is 3.43~3.53g / L.

[0029] As a preference for the above numerical range, the weight ratios of the raw materials of component A are: 14.6 to 14.7 parts of zinc nitrate, 18.9 to 19.1 parts of iron acetylacetonate, 2.9 to 3.1 parts of terephthalic acid, and poly Vinylpyrrolidone is 63-63.5 parts.

[0030] In this embodiment, it is further preferred that the volume of...

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Abstract

The invention discloses a negative electrode material which comprises zinc oxide particles coated with carbon layers and zinc ferrite particles coated with carbon layers, wherein the particle sizes of the zinc oxide particles and the zinc ferrite particles are smaller than 5nm; the carbon layers are 1 to 2nm thick; the zinc oxide particles coated with the carbon layers and the zinc ferrite particles coated with the carbon layers are stacked to form composite micro particles; the weight ratio of the zinc oxide particles to the zinc ferrite particles in the composite micro particles is (0.35-0.4) to 1; the particle sizes of the composite micro particles are 100 to 300nm; pores are formed between the zinc oxide particles coated with the carbon layers and the zinc ferrite particles coated with the carbon layer. The carbon-coated zinc-based composite oxide hollow octagonal negative electrode material is high in specific capacity, high in rate capability and high in cycle stability.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a negative electrode material, its preparation method and application. Background technique [0002] Lithium-ion batteries have been widely used since their commercialization due to their advantages such as high energy density, high operating voltage, and no memory effect. However, with the increasing demand for large-scale energy storage devices for novel energy storage, the energy density and power density of conventional commercial lithium-ion batteries can no longer meet the demand, and the development of battery materials with high capacity and high rate is imminent. At present, the negative electrode material of commercial lithium-ion batteries adopts graphite material with a specific capacity of 372mAh / g. Although it has good cycle performance, its specific capacity is low, and it is easy to cause safety hazards under high current charging and discharging conditions, w...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62B82Y30/00
CPCB82Y30/00H01M4/131H01M4/366H01M4/48H01M4/5835H01M4/625H01M10/0525Y02E60/10
Inventor 邹枫胡先罗黄云辉
Owner HUAZHONG UNIV OF SCI & TECH
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