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Method for solving flatulence of lithium titanate cathode of lithium battery by using double-boundary wrapping

A lithium-ion battery, lithium titanate technology, applied in battery electrodes, electrical components, circuits, etc., to achieve the effect of improving cycle life and improving cycle stability

Active Publication Date: 2013-07-03
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a double interface coating method to solve the flatulence of lithium titanate negative electrode of lithium ion battery. Through the double interface protection of nitride and fluorine-containing compound, the problem of flatulence of lithium titanate negative electrode can be solved, and the cycle stability of the battery can be improved. sex

Method used

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  • Method for solving flatulence of lithium titanate cathode of lithium battery by using double-boundary wrapping
  • Method for solving flatulence of lithium titanate cathode of lithium battery by using double-boundary wrapping
  • Method for solving flatulence of lithium titanate cathode of lithium battery by using double-boundary wrapping

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Embodiment 1

[0018] Weigh Li according to weight percentage 18:1 4 Ti 5 o 12 and nano-TiN powder, using a ball mill for 2 h to fully mix the two, put the mixed powder in an Ar gas atmosphere in a resistance furnace at 600 °C for 4 h, and cool to obtain TiN-coated Li 4 Ti 5 o 12 Negative electrode material, then, take 0.2 g of electrode material powder and disperse it in 20 mL of 10% polytetrafluoroethylene (PTFE) emulsion, ultrasonically disperse for 30 minutes, so that PTFE molecules are evenly coated on the surface of the electrode material, and finally centrifugally dry to obtain TiN - PTFE double coated Li 4 Ti 5 o 12 Negative material. The transmission electron microscope picture of gained powder product is shown in figure 1 . Li double coated with TiN-PTFE 4 Ti 5 o 12 Anode material, LiFePO 4 As the positive electrode material, celguard 2500 diaphragm, electrolyte EC:DMC=1:1, 1 mol L -1 LiF 6 An 800 mAh soft-pack lithium-ion battery assembled for the electrolyte, the...

Embodiment 2

[0020] Take 0.2 g Li 4 Ti 5 o 12 The anode material was dispersed in 10% cyanamide (CH 2 N 2 ) ethanol solution, dried in an oven at 60°C for 3 h to obtain surface-coated CH 2 N 2 Li 4 Ti 5 o 12 powder, and then heat-treated the powder at 700 °C for 3 h under nitrogen atmosphere to make CH 2 N 2 in Li 4 Ti 5 o 12 In situ decomposition of the surface into C 3 N 4 , cooled to obtain C 3 N 4 Surface-coated Li 4 Ti 5 o 12 electrode material. C 3 N 4 Surface-coated Li 4 Ti 5 o 12 The electrode material was dispersed in 5% LiF aqueous solution, sonicated for 15 min and centrifuged, and dried at 50 °C for 4 h to obtain C 3 N 4 -LiF double-coated Li 4 Ti 5 o 12 Negative material. The XRD pattern and 0.1 C charge and discharge pattern of the obtained product are shown in image 3 and Figure 4 , the results show that after C 3 N 4 -LiF double-coated Li 4 Ti 5 o 12 The negative electrode material maintains the spinel cubic structure well, and the pol...

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Abstract

The invention relates to a method for solving flatulence of a lithium titanate cathode of a lithium battery by using double-boundary wrapping, and belongs to the technical field of energy materials. The method is characterized in that firstly, boundary stabilizing layer wrapping is carried out on a nitride of a lithium titanate cathode material, so as to establish an electrochemistry stable boundary between an electrode material and electrolyte, and subsequently hydrophobic surface layer wrapping is carried out by adopting a nitrogen-containing compound so as to establish a hydrophobic electrode boundary and prevent the crystal water in the electrode material from entering electrolyte; and at the same time the trace moisture of an electrolyte system is prevented from diffusing to the electrode boundary to cause catalysis reaction, and the electrolyte is prevented from decomposing to generate gas in the charging and discharging process, so that the problem that a lithium ion battery is swelled is solved, and the circulation service life of the battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a method for solving the flatulence of a lithium titanate negative electrode of a lithium ion battery by coating a double interface. Background technique [0002] With the depletion of global fossil fuels and the increasing severity of the greenhouse effect, clean energy and low-carbon economy have become important research topics around the world. Electric vehicles have received great attention due to their energy-saving and environmental protection features. Among them, lithium-ion batteries, as high-performance green secondary batteries, are considered to be the primary choice for electric vehicle power sources due to their excellent cycle life, high energy density and rate performance. However, the performance improvement of lithium-ion batteries largely depends on the optimization of the performance of electrode materials. At present, the anode materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62
CPCY02E60/10
Inventor 崔光磊张传健逄淑平赵云琰韩鹏献姚建华
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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