Lithium ion battery 3.7 volt Li Ion Li-ion Cell

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A 3.7 volt Lithium-ion (Li-ion) cell is a type of rechargeable battery widely used in portable electronic devices. Here's a detailed description:

**Key Characteristics:**

* **Voltage:**

    * Nominal voltage of 3.7 volts. This is the average voltage during discharge.

* **Chemistry:**

    * Utilizes lithium ions as the primary charge carrier.

    * Various cathode materials are used, such as lithium cobalt oxide (LiCoO2), lithium manganese oxide (LiMn2O4), and lithium iron phosphate (LiFePO4), each offering different characteristics in terms of energy density, safety, and cycle life.

* **Rechargeability:**

    * Designed for multiple charge and discharge cycles, making them reusable.

* **Energy Density:**

    * Offers high energy density, meaning they can store a large amount of energy in a relatively small and lightweight package.

* **Form Factors:**

    * Available in various shapes and sizes, including cylindrical (e.g., 18650), prismatic, and pouch cells, to accommodate different device requirements.

* **Applications:**

    * Commonly used in smartphones, laptops, tablets, digital cameras, power banks, and other portable electronic devices.

    * Also used in electric vehicles (EVs) and energy storage systems.

* **Safety:**

    * Li-ion batteries require careful handling and charging due to the potential for thermal runaway if mishandled.

    * Modern Li-ion cells often include built-in safety features, such as overcharge and over-discharge protection.

* **Capacity:**

    * Measured in milliampere-hours (mAh), which indicates the amount of charge the battery can store. Higher mAh ratings mean longer runtime.

* **Cycle Life:**

    * The number of charge and discharge cycles a battery can withstand before its capacity significantly decreases.

**How They Work:**

* During charging, lithium ions move from the positive electrode (cathode) to the negative electrode (anode).

* During discharge, lithium ions move back from the anode to the cathode, releasing energy.

In summary, a 3.7V Li-ion cell is a crucial power source for modern portable electronics, offering high ener

gy density and rechargeability.