Preparation method of carbon-clad holmium-doped lithium titanate composite negative material

A negative electrode material, lithium titanate technology, used in battery electrodes, electrical components, circuits, etc., can solve problems such as poor conductivity and poor discharge performance at high currents, and achieve improved conductivity, fast charge and discharge rates, and improved electrical conductivity. Effects of Cyclic Stability

Inactive Publication Date: 2013-10-09
SUZHOU YIYUAN HONGDA INTPROP AGENCYCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a negative electrode material for lithium-ion batteries, lithium titanate has an intrinsic conductivi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] As an oil phase component, mix 100 parts by weight of monomer divinylbenzene, 100-150 parts by weight of hollow agent n-pentane, 5-10 parts by weight of nano silicon powder, and 7-10 parts by weight of acetone dispersant After ultrasonic dispersion, organic peroxide is added as a polymerization initiator to make a monomer mixture. In addition, as a water phase component, 500 parts by weight of deionized water, 10-20 parts by weight of polypropylene as a dispersant Alcohol is mixed.

[0016] Mix the obtained oil phase components and water phase components, and disperse them with ultrasonic waves to form a suspension. Stir the obtained suspension under a helium flow at a temperature of 90°C and keep it for 10 hours. Wash and dry the polymerized particles. Resin particles were obtained, and the obtained resin particles were heat-treated in an air atmosphere at a temperature of 400° C. for 2 hours, and then sintered in a helium atmosphere at a temperature of 1200° C. for 5 ...

Embodiment 2

[0020] As the oil phase component, the monomer divinylbenzene of 100 parts by weight, the hollow agent n-pentane of 150 parts by weight, the nano silicon powder of 10 parts by weight, the acetone dispersant of 10 parts by weight are mixed, after ultrasonic dispersion, and then An organic peroxide was added as a polymerization initiator to prepare a monomer mixture, and 500 parts by weight of deionized water and 20 parts by weight of polypropylene alcohol as a dispersant were mixed as a water phase component.

[0021] Mix the obtained oil phase components and water phase components, disperse them with ultrasonic waves to make a suspension, stir the obtained suspension under a helium flow at a temperature of 95°C, and keep it for 8 hours, wash and dry the polymerized particles. Resin particles were obtained, and the obtained resin particles were heat-treated in an air atmosphere at a temperature of 450° C. for 1 hour, and then sintered in a helium atmosphere at a temperature of 1...

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PUM

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Abstract

The invention relates to a preparation method of a carbon-clad holmium-doped lithium titanate composite negative material. The preparation method comprises the following steps of: (1) preparing carbon particles for the cladding; (2) mixing lithium hydrogencarbonate, titanium dioxide and holmium oxide serving as raw materials, adding the carbon particles for the cladding accounting for 3 to 5 percent by weight of the general weight of the three raw materials, adding an acetone dispersing agent, carrying out ball milling on a ball milling machine, and carrying out vacuum drying on the mixture to obtain a carbon-clad holmium-doped lithium titanate precursor; (3) sintering the dried carbon-clad holmium-doped lithium titanate precursor under a helium atmosphere to obtain a product. According to the carbon-clad holmium-doped lithium titanate composite negative material for a lithium ion battery, the conductive performance of the lithium titanate is improved by doping the holmium with the lithium titanate, and the conductivity and cycling stability of the battery can be further improved by cladding the lithium titanate with the carbon particles which are prepared through a specific process and has a hollow structure.

Description

Technical field [0001] The invention relates to a preparation method of a carbon-coated holmium-doped lithium titanate composite negative electrode material. Background technique [0002] In today's world, oil resources are becoming increasingly scarce and environmental pollution is becoming more and more serious, forcing countries to strive for new sustainable energy sources. With the increasing demand for energy storage systems with high power density and wide temperature range in practical applications such as aerospace, national defense, transportation, electronic information and instrumentation, especially electric vehicles, lithium-ion batteries, supercapacitors or supercapacitors Green energy storage devices represented by batteries have become the focus of current attention. The performance and preparation process of electrode materials largely determine the performance of energy storage devices, so the research on battery materials is particularly important. [00...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/62
CPCY02E60/10
Inventor 王媛媛
Owner SUZHOU YIYUAN HONGDA INTPROP AGENCYCO
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