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A composite titanium-based oxide negative electrode material and a fast-charging lithium-ion battery containing it

A lithium-ion battery and negative electrode material technology, applied in the field of electrochemistry, can solve the problems of shortened life, poor cycle performance, difficult processing of nano materials, etc., and achieve the effect of increasing the rate and improving the rate performance.

Active Publication Date: 2018-10-16
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium titanate also has shortcomings. Due to its high potential for lithium, the energy density of the battery is low and the cruising range is relatively short, which limits the application field of lithium titanate.
In recent years, a new type of titanate MLi 2 Ti 6 o 14 , the voltage platform is around 1.35V, lower than the 1.55V of lithium titanate, so the full battery voltage is higher, and there is also no lithium dendrite problem, its power characteristics and rate performance are better than lithium titanate, and the material particles are smaller The large processing performance is better, but the disadvantage is that the cycle performance is poorer than that of "zero strain" lithium titanate, but the two materials are mixed in a certain way, and the processing performance, fast charging performance and power performance of the material are all greater. On the premise that the service life is slightly shortened but sufficient to meet the requirements, composite titanium-based anode materials have great advantages in the application of fast charging and hybrid power fields
[0003] For example, Chinese patent application 201110215983.7 discloses a large-capacity, high-power soft-packaged lithium-ion power battery and its preparation method. This application only optimizes the conductive agent and formula to improve the rate performance of lithium titanate batteries. People usually use carbon coating Lithium titanate is used to improve its power and rate performance, but these still have the problem of difficult processing of nanomaterials, and the space for improving power and rate performance is relatively limited

Method used

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  • A composite titanium-based oxide negative electrode material and a fast-charging lithium-ion battery containing it
  • A composite titanium-based oxide negative electrode material and a fast-charging lithium-ion battery containing it
  • A composite titanium-based oxide negative electrode material and a fast-charging lithium-ion battery containing it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] With Li 4 / 3 Ti 5 / 3 o 4 As the negative electrode active material, it is dissolved in N-methylpyrrolidone solvent according to the ratio of 90% negative electrode active material (based on negative electrode mass), 5% conductive carbon black (based on negative electrode mass), and 5% PVDF (based on negative electrode mass), and vacuum Mix and disperse in a mixer to prepare a uniform and air-free slurry, which is coated on an aluminum foil to prepare a negative electrode sheet.

[0024] Lithium cobaltate is used as the positive electrode active material, dissolved in N-methylpyrrolidone solvent according to the ratio of 94% positive electrode active material (based on positive electrode mass), 3% conductive graphite (based on positive electrode mass), and 3% PVDF (based on positive electrode mass) , mixed and dispersed in a vacuum mixer to prepare a uniform and air-free slurry, and coated on an aluminum foil to prepare a positive electrode sheet.

[0025] The positive ...

Embodiment 2

[0028] Take SrLi 2 Ti 6 o 14 As the negative electrode active material, according to the ratio of 90% negative electrode active material (based on the negative electrode mass), 5% conductive carbon black (based on the negative electrode mass), 5% PVDF (based on the negative electrode mass) dissolved in N-methylpyrrolidone solvent, in vacuum Mix and disperse in a mixer to prepare a uniform and air-free slurry, which is coated on an aluminum foil to prepare a negative electrode sheet.

[0029] Lithium cobaltate is used as the positive electrode active material, dissolved in N-methylpyrrolidone solvent according to the ratio of 94% positive electrode active material (based on positive electrode mass), 3% conductive graphite (based on positive electrode mass), and 3% PVDF (based on positive electrode mass) , mixed and dispersed in a vacuum mixer to prepare a uniform and air-free slurry, and coated on an aluminum foil to prepare a positive electrode sheet.

[0030] The positive ...

Embodiment 3

[0033] With Li 4 / 3 Ti 5 / 3 o 4 and SrLi 2 Ti 6 o 14According to the mixing ratio of 3:7 as the negative electrode active material, it is dissolved in N-methyl Pyrrolidone solvent, mixed and dispersed in a vacuum mixer to prepare a uniform and bubble-free slurry, and coated on an aluminum foil to prepare a negative electrode sheet.

[0034] Lithium cobaltate is used as the positive electrode active material, dissolved in N-methylpyrrolidone solvent according to the ratio of 94% positive electrode active material (based on positive electrode mass), 3% conductive graphite (based on positive electrode mass), and 3% PVDF (based on positive electrode mass) , mixed and dispersed in a vacuum mixer to prepare a uniform and air-free slurry, and coated on an aluminum foil to prepare a positive electrode sheet.

[0035] The positive electrode sheet, negative electrode sheet, and diaphragm prepared above are laminated to form a battery cell, and the tabs are welded to the current coll...

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Abstract

The present invention relates to a composite titanium oxide negative electrode material and a fast charging type lithium ion battery containing the same, wherein lithium titanate and a titanate MLi2Ti6O14 (M is Sr, Ba or Na) are mixed as a negative electrode active material according to a certain ration so as to prepare the lithium battery for the fast charging field. According to the present invention, mainly the fast charging performance of the single lithium titanate negative electrode material is improved and the difficult processing problem of the lithium titanate nanometer material in the current production technology is solved; and the characteristics of long service life and difficult processing of the lithium titanate material and the characteristics of easy processing and high rate performance of the novel titanate microparticles are combined to form the complementation of the advantages so as to improve the rate charging performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a composite titanium-based oxide negative electrode material and a fast-charging lithium-ion battery containing the same. Background technique [0002] Due to the high potential of lithium intercalation, lithium titanate will not cause lithium dendrites, and its high safety and long life as anode materials have been a research hotspot in recent years. However, lithium titanate also has shortcomings. Due to its high potential for lithium, the energy density of the battery is low and the cruising range is relatively short, which limits the application field of lithium titanate. In recent years, a new type of titanate MLi 2 Ti 6 o 14 , the voltage platform is around 1.35V, lower than the 1.55V of lithium titanate, so the full battery voltage is higher, and there is also no lithium dendrite problem, its power characteristics and rate performance are better tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/131H01M4/1391H01M10/0525
CPCY02E60/10
Inventor 吴可孙小嫚高雅陈啸天叶璟刘正耀吴宁宁
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD