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Selection and treatment of metal lithium metal chips, battery separators and electrolytes in the preparation of laboratory coin cells battery.
1.Laboratory lithium metal chips:
It is required to use lithium chips with a purity of not less than 99.9%, and the diameter of 15-15.8 mm (corresponding to CR2032 coin cells with a pole piece size of 14 mm) is often used for the preparation of button half-cells, thickness is 0.5-0.8 mm, the surface is straight, silver-white and bright, without oil spots, perforations and tears.
2.The type of separator needs to be selected according to the experimental requirements. Generally, it is an insulating film with nanopores. After absorbing the electrolyte, it can allow two-way transmission of ions. Single-layer or multi-layer polyethylene or polypropylene separators are often used.
Generally choose to purchase commercial separators, and use the punching machine, Coin Cell Disc Cutter diaphragm to prepare a circular shape with regular size. The size needs to be larger than the metal lithium sheet and the electrode to be tested to isolate the positive and negative electrodes.
Usually the inner diameter of the button battery case is the same (for example, the separator diameter of CR2032 is 15.5 ~ 16.5 mm). Industrial polypropylene membranes of Celgard 2400 or Celgard 2500 are often used in laboratories.
3.When assembling button-type lithium-ion batteries for laboratory use, the LiPF6 system electrolyte is usually selected [for example, the electrolyte of lithium iron phosphate batteries is generally a LiPF6 solution with a concentration of 1 mol/L,
The mixed solution of EC/DEC is 1:1 (volume ratio) as the solvent, and can be selected according to the experimental requirements.
Such as choosing a common ratio electrolyte, an electrolyte containing one or more additives, etc. The amount of electrolyte used in button cell assembly is usually excessive. For example, the amount of electrolyte used in the button cell CR2032 is generally 100-150 μL, and the amount of electrolyte used in the simulated battery is generally 200 μL. If a long cycle is required, the amount of electrolyte can be appropriately increased.
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