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A kind of spherical lithium titanate composite negative electrode material and preparation method thereof

A negative electrode material, lithium titanate technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of increased battery processing difficulty, cycle performance attenuation, difficult dispersion, etc., to achieve excellent electrochemical performance, processing performance suppression, easy to use scattered effect

Active Publication Date: 2017-09-05
SHANDONG ZHAOWEN NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the lithium titanate negative electrode materials with good electrochemical performance on the market are basically nano-scale materials, and the particle size is basically below 1 μm, which is easy to agglomerate and extremely difficult to disperse, which increases the difficulty of battery processing; Lithium-ion batteries with lithium titanate as the negative electrode material will produce gas in practical applications, resulting in serious degradation of cycle performance

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  • A kind of spherical lithium titanate composite negative electrode material and preparation method thereof
  • A kind of spherical lithium titanate composite negative electrode material and preparation method thereof
  • A kind of spherical lithium titanate composite negative electrode material and preparation method thereof

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Embodiment 1

[0027] Embodiment 1: The spherical lithium titanate composite negative electrode material is prepared by the following process steps.

[0028] Add lithium carbonate, anatase titanium dioxide, hydrated magnesium trisilicate, and lithium fluoride to deionized water at a molar ratio of 0.405:1:0.002:0.002, and add 2wt% polyvinyl alcohol to form a precursor slurry with a solid content of 20wt%. Material; use a stirring ball mill to mill at a low speed of 200r / min for 2h, then at a high speed of 500r / min for 2h, until the particle D50 of the precursor slurry reaches 0.8μm, and then use an ultra-fine sand mill to sand at a low speed of 500r / min for 2h , and then sanded at a high speed of 1500 / min for 5 hours until the D50 of the precursor slurry particles reached 0.25 μm; the slurry was sent into the spray dryer at a certain feed rate (the inlet air temperature of the spray dryer was 180-220°C, The air temperature is controlled at 90-150°C) to obtain a spherical precursor, and its s...

Embodiment 2

[0032] Embodiment 2: The spherical lithium titanate composite negative electrode material is prepared by the following process steps.

[0033] Add lithium hydroxide, anatase titanium dioxide, hydrated magnesium trisilicate, and lithium fluoride to deionized water at a molar ratio of 0.800:1:0.003:0.002, and add 4wt% ammonium polyacrylate to form a precursor with a solid content of 15wt%. Slurry: Use a stirring ball mill to mill at a low speed of 300r / min for 2h, then at a high speed of 800r / min for 5h, until the particle D50 of the precursor slurry reaches 0.8μm, and then use an ultra-fine sand mill to sand at a low speed of 800r / min 2h, then sand mill at high speed 1800 / min for 2h until the D50 of the precursor slurry particles reaches 0.28μm; send the slurry into the spray dryer at a certain feed rate (the inlet air temperature of the spray dryer is 180-220°C , the air outlet temperature is controlled at 90-150°C) to obtain a spherical precursor with a secondary particle D50...

Embodiment 3

[0036] Embodiment 3: The spherical lithium titanate composite negative electrode material is prepared by the following process steps.

[0037] Add lithium nitrate, anatase titanium dioxide, hydrated magnesium trisilicate, and ammonium fluoride to deionized water at a molar ratio of 0.82:1:0.005:0.005, and add 3wt% polyvinyl alcohol to form a precursor slurry with a solid content of 15wt%. Material; use a stirring ball mill to mill at a low speed of 400r / min for 3h, then at a high speed of 900r / min for 3h, until the particle D50 of the precursor slurry reaches 0.7μm, and then use an ultra-fine sand mill to sand at a low speed of 800r / min for 2h , and then sanded at a high speed of 1900 / min for 4 hours until the D50 of the precursor slurry particles reached 0.2 μm; the slurry was fed into the spray dryer at a certain feed rate (the inlet air temperature of the spray dryer was 180-220°C, The air outlet temperature is controlled at 90-150°C) to obtain a spherical precursor with a ...

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Abstract

The invention relates to a lithium ion battery cathode material, in particular to a spherical lithium titanate composite cathode material and a preparation method thereof. The lithium titanate composite cathode material is a solid spherical composite cathode material formed by nano particles, the D50 of the primary particles ranges from 0.1 micrometer to 0.3 micrometer, the D50 of the secondary particles ranges from 5 micrometers to 7 micrometers, magnesium ions, silicon ions and fluorine ions are doped, the surface of the material is provided with an aluminum oxide coating layer, and the chemical formula of the spherical lithium titanate composite cathode material is Lix-yMgySi3y / 2Ti5-3y / 2O12-yFy.nAl2O3. The cathode material prepared through the method has excellent electrochemical performance and good processability, and aerogenesis of the material can be effectively inhibited.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, in particular to a spherical lithium titanate composite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become possible to replace nickel-metal hydride batteries, lead-acid batteries and NiCr Batteries Potential Power Sources for Electric Vehicles and Energy Storage Stations. The large-scale development and application of electric vehicles and new energy storage places higher requirements on the comprehensive performance of lithium-ion batteries. As we all know, the current commercialized lithium-ion battery anode materials mainly use graphite carbon anode materials, which tend to react violently with the electrolyte during overcharge and overdischarge, causing the battery to explode, posing a huge safety hazard. Improving the safety of lithium-ion batteries, increasing the energy density of batteries, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/62
CPCH01M4/485H01M4/628Y02E60/10
Inventor 陶静静
Owner SHANDONG ZHAOWEN NEW ENERGY TECH CO LTD
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