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Lithium cathode used for lithium battery and provided with sandwich structure and preparation method thereof

A sandwich and lithium negative electrode technology, applied in the field of electrochemical batteries, can solve the problems of high temperature in the preparation process, unstable contact, easy water absorption, etc.

Active Publication Date: 2017-01-18
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solid electrolytes can inhibit the growth of dendrites due to their own strength advantages, but solid polymer electrolytes represented by polyethylene oxide (PEO) have low room temperature ionic conductivity and cannot meet actual needs; fast ion conductors such as Li 0.35 La 0.55 TiO 3 , Li 7 La 3 Zr 2 o 12 Although the conductivity is high, its preparation process is high in temperature (>1000°C) and high in cost; Li 10 GeP 2 S 12 The conductivity at room temperature is as high as 12mS / cm, but it is easy to absorb water and the contact with lithium metal is unstable
In addition, the above-mentioned lithium protection method is complicated in process, high in cost, and has limited modification effect, so it is not easy for industrial production

Method used

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  • Lithium cathode used for lithium battery and provided with sandwich structure and preparation method thereof
  • Lithium cathode used for lithium battery and provided with sandwich structure and preparation method thereof
  • Lithium cathode used for lithium battery and provided with sandwich structure and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0035]Under magnetic stirring, polyvinylidene fluoride (PVDF) with a mass fraction of 5% was dissolved in N-methylpyrrolidone (NMP). After PVDF was completely dissolved, doped polyaniline (PANI) polymer was added to it. Material, magnetic stirring for 4h to obtain a uniform slurry, and then coating the conductive current collector copper foil (Cu) with a 10 μm thick slurry by scraping on the coating machine, and then the coated material was placed at 55. After drying at ℃ for 12 h, the electrode precursor was obtained. Then the electrode precursor was punched into 14 μm small discs, loaded into a coin cell, and deposited at 0.5 mA / cm by electrochemical deposition. 2 deposition at a current density of 1mAh / cm 2 The metal lithium is inserted between the polymer material of the electrode precursor and the conductive current collector to obtain a sandwich-structured lithium anode.

[0036] The surface scanning electron micrograph of the obtained electrode precursor is shown as ...

Embodiment 2

[0041] The PVDF with a mass fraction of 5% in Example 1 was replaced with PVDF with a mass fraction of 10% to prepare a sandwich structure lithium negative electrode, and the battery performance of the sandwich structure lithium negative electrode was tested, Figure 8 The results show that the performance of Example 2 is basically similar to that of Example 1, and the performance of Example 2 is slightly lower than that of Example 1, which may be due to the weakening of the conductivity after the PANI content is reduced. The internal polarization of the battery becomes larger.

Embodiment 3

[0043] The doped PANI in Example 1 was replaced by the intrinsic PANI, and a sandwich-structured lithium negative electrode was prepared. The battery performance of the sandwich-structured lithium negative electrode was tested, and the performance similar to that of Example 1 was obtained.

[0044] For typical method (b):

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Abstract

The invention discloses a lithium cathode used for a lithium battery and provided with a sandwich structure and a preparation method thereof. The lithium cathode is provided with the sandwich structure formed by a conductive current collector, a metal lithium layer and a high polymer material layer. The method for preparing the lithium cathode comprises a first step of preparing an electrode precursor by compounding a high polymer material and the conductive current collector; and a second step of causing metal lithium to enter an intermediate layer of the electrode precursor to form the lithium cathode with the sandwich structure. By introduction of the high polymer material as a protective layer, growth of metal lithium dendrites can be inhibited, the safety of the lithium battery is improved, the volume expansion in the lithium battery cyclic process can be adapted, and an effect of stabilizing an interface is achieved. In addition, the conductive high polymer material can form a conductive network on the surface of the lithium cathode, lithium ions are induced to be deposited evenly, and a buffer effect on the lithium ions can also be achieved under the conditions of high-current charging and discharging. The method is simple to operate, low in cost, has easiness in large-scale production and has great potential application values in the lithium battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemical batteries, and relates to a lithium battery electrode, in particular, to a lithium negative electrode having a sandwich structure for a lithium battery and a preparation method thereof. Background technique [0002] In the information age, people's lives are inseparable from electronic devices such as mobile phones and computers. The normal operation of these devices is inseparable from electricity, and chemical power sources have become an indispensable power source in life. Since the "Voltaic Pile" in 1799, every breakthrough in chemical power technology has brought about a revolutionary development of electronic equipment. [0003] In recent years, under the dual pressure of depletion of traditional fossil energy and environmental protection, chemical power has developed into a new stage. The advancement of science and technology forces people to look for a battery with high energy den...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M10/0525
CPCH01M4/134H01M4/1395H01M10/0525H01M2004/027Y02E60/10
Inventor 詹彬鑫刘雯王可解晶莹
Owner SHANGHAI INST OF SPACE POWER SOURCES
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