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Verification Test of Bonding Strength for Collector Electrode

Verification Test of Bonding Strength for Collector Electrode
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Verification Test of Bonding Strength for Collector Electrode - 1

Verification Test of Bonding Strength for Collector Electrode Most people are familiar with Li-ion batteries, which are widely used in electronic products such as electric automobile and industrial energy reserve. However, except those specialists, few people know about the internal structure of Li-ion batteries. Despite of its shape, a Li-ion battery is composed of positive electrode, negative electrode, diaphragm and electrolyte. Li-ion battery works mainly by the movement of li-ions between positive electrode and negative electrode. When a battery is charging up, li-ions are generated in the positive electrode, then move to the negative electrode through the electrolyte and finally embed into the micropores on the carbon layer of the negative electrode patch. The more li-ions embed into the negative electrode patch, the higher the charging capacity is. When the battery is discharging, the li-ions move back to the positive electrode. The more li-ions move back to the positive electrode, the higher the discharging capacity is. The electrode is the electrochemical reaction area inside the Li-ion battery, which is made from metal current-collector coated with active substance and adhesive (See Figure 1).The collector of positive electrode is usually made of aluminum foil, and the collector of negative electrode is made of copper foil. The collector contacts the active substance to collect the current generated by the active substance and output the current. Therefore, the bonding strength between the collector and active substance is critical to the

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Verification Test of Bonding Strength for Collector Electrode - 2

performance of the battery. The bonding strength between the collector and the active substance may encounter some problems during charging and discharging processes. The li-ion may enter and get off the electrode repeatedly, which may cause the change of structure of the active substance. Repeated expansion and contraction are liable to cause the separation of the collector and active substance. As a result, the electric resistance may be increased and the cycle life of the battery may be reduced. In order to prevent the negative influences of those problems, it is necessary to do some...

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Verification Test of Bonding Strength for Collector Electrode - 3

Curr rently, the s study on en nhancing th bonding strength be he etween colle ector and active of elec ctrode subst tance is on the rise, the li-ion batte industry has plenty o experienc in e ery ce this area. More verification tests will be done to pro e ovide more analytical da for impro a ata oving the performance of Li-ion batteries. e ments Co., Ltd, is alway dedicated to providing customers with packa L ys d g s aging Labthink Instrum testing solutions and helpin the manu s ng ufacturers to reach their goals of qu o r uality and sa afety assu urance thro ough improv vement of p...

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