Composite lithium titanate electrode material and preparation method thereof

A technology of composite lithium titanate and electrode materials, which is applied in the direction of electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve the problems of difficulty in realizing large-scale industrial production, low utilization rate of reaction furnace, and rising cost, etc., so as to increase effective Reaction area, improvement of high-rate performance, and improvement of processability

Active Publication Date: 2007-07-18
BTR NEW MATERIAL GRP CO LTD
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  • Abstract
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Problems solved by technology

Its disadvantages are also obvious: the addition of organic compounds increases the cost; during the sintering process, gelation into powder is a process of violent volume expansion, so the utilization rate of th...

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  • Composite lithium titanate electrode material and preparation method thereof
  • Composite lithium titanate electrode material and preparation method thereof
  • Composite lithium titanate electrode material and preparation method thereof

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preparation example Construction

[0033] The preparation method of the composite lithium titanate electrode material of the present invention comprises the following steps: 1. 27.5-24.75wt% inorganic lithium salt, 72.5-65.25wt% industrial grade titanium dioxide, 1-10wt% nano-carbon coating material Or more than 0-10wt% doping modifier, using high-speed stirring, solid-phase high-energy ball milling or liquid-phase high-energy ball milling for 2 to 40 hours to prepare a composite lithium titanate precursor mixture; 2. Disperse the above mixture in In the organic solvent ethanol or acetone, the dispersed powder is obtained by a transient drying method; 3. The dispersed powder is heat-treated in the temperature range of 500 to 950 ° C for 4 to 40 hours, and the protective gas is filled during the heat treatment. The protective gas is nitrogen, argon, helium, neon, CO or CO 2 Gas; 4. Natural cooling to below 150°C for crushing and sieving.

[0034] The solid-phase high-energy ball milling method or the liquid-pha...

Embodiment 1

[0037] Embodiment 1: Take by weighing 500g of industrially produced titanium dioxide and 189.6g of lithium carbonate in a ball mill jar, add 36.3g of nano-graphite powder, and obtain a precursor mixture after 10 hours of ball milling at a speed of 350 rpm on a planetary ball mill, and the precursor particles As shown in Figure 1, the mixture is dispersed in ethanol, and the dispersed powder is obtained by a transient drying method. The dispersed powder is shown in Figure 2. The resulting dispersed powder is placed in a crucible and placed in a nitrogen atmosphere to protect the high temperature furnace , heat up to 600°C, keep warm for 15 hours, cool naturally to below 150°C, take it out, crush and sieve to obtain the composite lithium titanate material, as shown in Figure 3 and Figure 4, the prepared composite lithium titanate The particles are secondary particles composed of nano-lithium titanate and nano-carbon materials. The composite lithium titanate particles have spheric...

Embodiment 2

[0038] Embodiment 2: Weigh 500g of industrially produced titanium dioxide and 189.6g of lithium carbonate in a ball mill jar, add 76.6g of glucose as a carbon coating material, and obtain a precursor mixture after ball milling at a speed of 350rpm on a planetary ball mill for 40 hours. Disperse the mixture in an ethanol solvent, and use a transient drying method to obtain a dispersed powder. The obtained dispersed powder is placed in a crucible, placed in a high-temperature furnace protected by a nitrogen atmosphere, and heated to 950 ° C. After 4 hours of heat preservation, it is naturally cooled to Below 150°C, take it out, crush and sieve to get the composite lithium titanate material.

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Abstract

The invention discloses an electrode material of composite lithium titanate and its preparation method, which is secondary particles with spherical or similar spherical shape and porous nanometer channels, which is made from lithium titanate particles, nano-carbon coated materials and doped modifier. The preparation method includes: milling the inorganic lithium salt, titanium dioxide, nano-carbon coated material or doped modifier, scattering them into the organic solvent for further drying, processing heat treatment, and cooling. Comparing with the existing technologies, this electrode material has the high-rate performance, highly reversible electrochemical capacity, and smaller surface area to enhance its first Coulomb efficiency and cycle stability, applying to rechargeable and once-use lithium-ion battery.

Description

technical field [0001] The invention relates to a battery electrode material and a preparation method thereof, in particular to a composite lithium titanate material for lithium batteries and a preparation method thereof. Background technique [0002] In recent years, spinel lithium titanate Li 4 Ti 5 o 12 As an electrode material for a new type of energy storage battery, attention has been paid more and more attention. This is because the crystal structure of spinel-type lithium titanate can maintain a high degree of stability during the lithium ion intercalation-deintercalation process. Both before and after lithium ion intercalation are spinel. structure, and the lattice constant changes very little, and the volume change is very small, less than 1%, so Li 4 Ti 5 o 12 Known as "zero strain" electrode material. This can avoid the structural damage caused by the back and forth expansion and contraction of the electrode material during the charge-discharge cycle, there...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/48H01M4/04B22F1/02B22F9/00B01J19/00C04B35/462C04B35/622
CPCY02E60/10
Inventor 岳敏钟志强张万红
Owner BTR NEW MATERIAL GRP CO LTD
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