A method for modifying lithium titanate negative electrode material of 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 increasing electrode/electrolyte interface impedance, affecting the application of lithium titanate, and reducing cycle performance, and achieving reversible capacity and The effect of improving cycle performance, reducing charge transfer resistance, and reducing polarization

Active Publication Date: 2018-12-21
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 method for modifying lithium titanate negative electrode material of lithium ion battery
  • A method for modifying lithium titanate negative electrode material of lithium ion battery

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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 soak it in 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 an ethylenediaminetetraacetic acid chelating agent to an absolute ethanol solution containing lithium hydroxide, and stir in a water bath at 60°C for 2 hours to obtain a 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...

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 soak it in HCL solution with a molar concentration of 8mol / L at normal temperature and pressure for 15h 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 an oxalic acid chelating agent to an absolute ethanol solution containing lithium acetate, and stir in a water bath at 70°C for 6 hours to obtain a sol; wherein, the molar concentration of lithium acetate is 1.5mol / L, and the mass concentration of oxalic acid is 5%. ;

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

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 soak it in 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 a citric acid chelating agent to an absolute ethanol solution containing lithium nitrate, and stir in a water bath at 80°C for 12 hours to obtain a 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...

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Abstract

The invention discloses a modification method of lithium titanate negative electrode material of lithium ion battery, wherein, pure titanium sheet is placed in an acidic solution and calcined to obtain titanium dioxide thin film, the titanium dioxide thin film is immersed in lithium source sol, the lithium titanate precursor thin film is obtained after extraction and pre-firing, and the lithium titanate precursor thin film is taken as a substrate and coated by plasma spraying. Ytterbium silicate coating was prepared by physical vapor deposition (PVD) on the substrate surface, and the cathode material of Ytterbium silicate coated lithium titanate thin film was obtained after calcination. The modified ytterbium silicate coated lithium titanate thin film negative electrode material can not only inhibit the growth of lithium titanate particles, but also inhibit the water absorption of the material, and can effectively maintain the structural stability of lithium titanate, improve the ratioof lithium titanate, cycle and chemical stability in the repeated charging and discharging process.

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 Applications(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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