FeCoCuZn co-doped Ni-based alloy-carbon nanotube composite material modified diaphragm as well as preparation method and application thereof

Abstract

The invention discloses a preparation method of a FeCoCuZn co-doped Ni-based alloy-carbon nanotube composite material modified diaphragm. The method comprises the following steps: weighing a self-synthesized high-entropy alloy / carbon nano composite material and a binder according to a ratio, uniformly grinding, dropwise adding a solvent to prepare slurry, and coating a diaphragm base membrane with the slurry by using a coating machine; and performing microwave heating treatment under inert gas protection for 5-30 minutes, enabling the heating temperature of the diaphragm coated with the slurry to be 50-80 DEG C, and cooling the diaphragm to normal temperature at a cooling speed of about 20 DEG C / min after heating to obtain a modified diaphragm with the FeCoCuZn co-doped Ni-based alloy-carbon nano tube composite material coating. The thickness of the FeCoCuZn co-doped Ni-based alloy-carbon nanotube composite material coating of the diaphragm is 2-15 [mu]m. When the modified diaphragm is applied to a battery, the conductivity of a positive electrode can be improved, battery expansion can be relieved, the side reaction of the positive electrode and an electrolyte can be inhibited, the mechanical lightness and puncture strength of the diaphragm can be improved, and the safety and self-discharge performance of the battery can be effectively improved.

Description

technical field

[0001] The invention belongs to the field of battery technology and relates to a battery diaphragm, in particular to a FeCoCuZn co-doped Ni-based alloy-carbon nanotube composite material modified diaphragm and a preparation method and application thereof. Background technique

[0002] In the structure of the battery, the separator is one of the key inner components. The separator is mainly located between the positive electrode and the negative electrode, and its main function is to separate the active materials of the positive and negative electrodes to prevent the short circuit of the two electrodes due to contact; in addition, during the electrochemical reaction, it can maintain the necessary electrolyte and form a channel for ion movement. The performance of the diaphragm determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle, and safety performance of the battery. Therefore, the diaphragm mus...

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