A modification method of lithium titanate negative electrode material for lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of increased electrode/electrolyte interface impedance, affecting the application of lithium titanate, and decreasing rate performance, etc., to achieve reversible capacity and Improved cycle performance, reduced charge transfer resistance, and reduced polarization

Active Publication Date: 2021-05-14
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the lithium titanate negative electrode material is easy to produce gas during the battery manufacturing process, which increases the electrode / electrolyte interface impedance, rapidly decays the cycle performance, decreases the rate performance, and shortens the battery life, which greatly affects the application of lithium titanate.

Method used

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  • A modification method of lithium titanate negative electrode material for lithium ion battery
  • A modification method of lithium titanate negative electrode material for lithium ion battery

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Effect test

Embodiment 1

[0030] A method for modifying a lithium titanate negative electrode material for a lithium ion battery, specifically comprising the following steps:

[0031] (1) After smoothing the pure titanium sheet with sandpaper, ultrasonically clean it with acetone, absolute ethanol and deionized water in sequence, and then put it into the HCL solution with a molar concentration of 6mol / L at normal temperature and pressure for 10h Then take it out, wash it with deionized water until the pH value is 6, put it into a drying oven, dry it at 80°C for 1 hour, and calcinate it at 350°C for 3 hours to obtain a titanium dioxide film;

[0032] (2), add ethylenediaminetetraacetic acid chelating agent in the dehydrated ethanol solution containing lithium hydroxide, stir 2h in water bath at 60 ℃, obtain sol; Wherein, the molar concentration of lithium hydroxide is 0.1mol / L, B The mass concentration of diamine tetraacetic acid is 1%;

[0033] (3) Immerse the titanium dioxide film obtained in step (1) ...

Embodiment 2

[0039] A method for modifying a lithium titanate negative electrode material for a lithium ion battery, specifically comprising the following steps:

[0040] (1) After smoothing the pure titanium sheet with sandpaper, ultrasonically clean it with acetone, absolute ethanol and deionized water in sequence, and then put it into the HCL solution with a molar concentration of 8mol / L at normal temperature and pressure for 15 hours. Then take it out, then wash it with deionized water until the pH value is 7, and finally put it in a drying oven at 90°C for 5 hours, and then calcinate at 450°C for 4 hours to obtain a titanium dioxide film;

[0041] (2), add oxalic acid chelating agent in the dehydrated ethanol solution containing lithium acetate, stir in water bath at 70 ℃ for 6h, obtain sol; Wherein, the molar concentration of lithium acetate is 1.5mol / L, the mass concentration of oxalic acid is 5% ;

[0042] (3) Immerse the titanium dioxide film obtained in step (1) into the sol obt...

Embodiment 3

[0048] A method for modifying a lithium titanate negative electrode material for a lithium ion battery, specifically comprising the following steps:

[0049] (1) After smoothing the pure titanium sheet with sandpaper, ultrasonically clean it with acetone, absolute ethanol and deionized water in sequence, and then put it into the HCL solution with a molar concentration of 10mol / L at normal temperature and pressure for 25 hours. Then take it out, wash it with deionized water until the pH value is 7.5, put it in a drying oven, dry it at 100°C for 8 hours, and calcinate it at 600°C for 4 hours to obtain a titanium dioxide film;

[0050] (2), add citric acid chelating agent in the dehydrated ethanol solution containing lithium nitrate, stir 12h in water bath at 80 ℃, obtain sol; Wherein, the molar concentration of lithium nitrate is 3mol / L, and the mass concentration of citric acid is 15 %;

[0051] (3) Immerse the titanium dioxide film obtained in step (1) into the sol obtained i...

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Abstract

The invention discloses a method for modifying a lithium titanate negative electrode material of a lithium ion battery. A titanium dioxide film is obtained by placing a pure titanium sheet in an acidic solution for immersion and calcining. The titanium dioxide film is immersed in a lithium source sol, and the preparation method is obtained after precalcination. Lithium titanate precursor thin film, with the lithium titanate precursor thin film as the substrate, the coating layer of ytterbium silicate is prepared on the surface of the substrate by plasma spraying-physical vapor deposition technology, and the lithium titanate thin film coated with ytterbium silicate is obtained after calcining Negative material. The lithium titanate thin film negative electrode material coated with ytterbium silicate obtained after the modification of the present invention can not only suppress the growth of lithium titanate particles, but also suppress the water absorption of the material, and can effectively maintain lithium titanate in the process of repeated charging and discharging. The structure is stable, and the rate, cycle and chemical stability of lithium titanate are improved.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a method for modifying lithium titanate negative electrode materials of lithium ion batteries. Background technique [0002] Traditional anode materials are mainly carbon materials. Carbon materials have the advantages of good cycle stability and low charge-discharge platform, but there are also some disadvantages, such as the potential safety hazard of lithium dendrite precipitation, and the speed of energy release is not fast enough, so it is not suitable for Equipment that requires instantaneous high current, etc. Compared with carbon materials, lithium titanate (Li 4 Ti 5 o 12 ) has obvious advantages, the theoretical specific capacity of lithium titanate material is 175mAh / g, the actual specific capacity is greater than 160mAh / g, and the cycle life of lithium titanate is long, Li 4 Ti 5 o 12 It is a "zero-strain material". Lithium ions have good mobilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/628H01M10/0525Y02E60/10
Inventor 刘兴亮杨茂萍汪伟伟
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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