Wiktor Wise
Batteries are a source of electric power that can be used to power electrical devices. They are a form of stored electricity. They consist of one or more electrochemical cells with external connections. The two terminals of a battery are made of different chemicals, typically metals, and are called the anode and the cathode. When a battery is connected to an external electric load, negatively charged electrons flow from the negative terminal (anode) to the positive terminal (cathode) through the circuit, thus causing a redox reaction by attracting positively charged ions, or cations. This flow of electrons provides an electric current that can be used to do work.
| Characteristics | Values |
|---|---|
| Definition | A battery is a device that stores chemical energy and converts it to electrical energy |
| Basic Function | Stores and releases electricity on demand |
| Basic Components | Anode, Cathode, Electrolyte |
| Basic Functionality | The flow of electrons from the anode to the cathode through an external circuit |
| Charging | When electrons move from the cathode to the anode, they increase the chemical potential energy, thus charging the battery |
| Discharging | When electrons move from the anode to the cathode, they convert chemical potential energy to electricity in the circuit and discharge the battery |
| Reversibility | In some batteries, the reaction can be reversed, allowing the battery to be recharged |
| Types | Primary batteries, Secondary batteries, Rechargeable batteries |
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What You'll Learn
How batteries work
A battery is a device that stores chemical energy and converts it to electrical energy. It is a source of electric power consisting of one or more electrochemical cells with external connections for powering electrical devices. The oldest form of rechargeable battery is the lead-acid battery, which is widely used in automotive and boating applications.
The chemical reactions in a battery involve the flow of electrons from one material (electrode) to another, through an external circuit. The flow of electrons provides an electric current that can be used to do work. To balance the flow of electrons, charged ions also flow through an electrolyte solution that is in contact with both electrodes. Different electrodes and electrolytes produce different chemical reactions that affect how the battery works, how much energy it can store, and its voltage. Voltage is the force at which the reaction driving the battery pushes electrons through the cell. Current is the number of electrons that pass through any one point of a circuit at a given time. The higher the current, the more work it can do at the same voltage.
The battery will transfer electricity until things equalize, at which point the electricity will cease to flow. During charging or discharging, the oppositely charged ions move inside the battery through the electrolyte to balance the charge of the electrons moving through the external circuit and produce a sustainable, rechargeable system. Once charged, the battery can be disconnected from the circuit to store the chemical potential energy for later use as electricity.
The process of recharging a battery is not perfect. The replacement of the negative and positive ions from the electrolyte back onto the relevant electrode as the battery is recharged is not as neat or as structured as the original electrode. Each charge cycle degrades the electrodes a little more, meaning the battery loses performance over time, which is why even rechargeable batteries don't last forever.
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How electricity flows
A battery is a source of electric power consisting of one or more electrochemical cells with external connections for powering electrical devices. Batteries are not a form of electricity, but they can store chemical energy and convert it to electrical energy.
The flow of electricity depends on the movement of electrons and the type of circuit. Electricity travels in closed circuits, in a closed loop. The electricity needs to have a complete path from the power station where it is generated, to the wires in your home, and back again. If the circuit is open, the electricity cannot flow.
In a wire, negatively charged electrons move, and positively charged atoms do not. In an electrical circuit, electricity can flow in either direction. The direction of flow depends on the type of charge carriers. In metals, the positively charged atomic nuclei are held in a fixed position, and the negatively charged electrons are free to move about in the metal. Electrons move from the negative terminal of a battery to the positive terminal.
In a battery, electrons move from the cathode to the anode, increasing the chemical potential energy and charging the battery. When they move in the opposite direction, they convert this chemical potential energy to electricity in the circuit and discharge the battery.
There are two types of batteries: primary batteries and secondary batteries. Primary batteries are also called primary cells and can produce current immediately on assembly. They are commonly used in portable devices with low current drain. Secondary batteries, also known as secondary cells or rechargeable batteries, must be charged before first use. They are charged by applying an electric current, which reverses the chemical reactions that occur during discharge.
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The role of chemical energy
Batteries are devices that store chemical energy and convert it into electrical energy. This process is achieved through controlled chemical reactions, which involve the flow of electrons from one material (electrode) to another through an external circuit. The flow of electrons creates an electric current that powers our devices.
The anode and cathode, known as the battery's electrodes, play crucial roles in this process. The anode (negative electrode) discharges electrons into the external circuit, while the cathode (positive electrode) accepts these electrons. The electrolyte, a substance that allows ions to flow between the two terminals, acts as a medium, facilitating the flow of ions.
Different types of batteries use varying materials for these components, leading to differences in performance, lifespan, and safety. For example, lithium-ion batteries, popular in electronic devices due to their high energy density, use lithium as the anode and a variety of materials for the cathode. The specific materials used can greatly affect a battery's performance, including its energy density and discharge rate.
The chemical reactions in a battery are almost-but-not-quite completely reversible, contributing to the 'memory effect'. This effect occurs when rechargeable batteries are recharged without being sufficiently discharged first, causing them to 'remember' where they were in earlier discharge cycles and resulting in improper recharging.
In summary, the role of chemical energy in batteries is to be stored and converted into electrical energy through controlled chemical reactions. This process involves the flow of electrons and ions through the battery's components, with the specific materials used impacting the battery's performance and characteristics.
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Electrochemical cells
An electric battery is a source of electric power consisting of one or more electrochemical cells with external connections for powering electrical devices. Electrochemical cells allow electrons to be transferred, which will spontaneously occur in the direction of ΔG < 0. The cell's electrochemical potential, or voltage, is determined by the difference between the two E0 values.
There are two modes in which an electrochemical cell operates. The first is the spontaneous redox reaction, which can be used to provide energy to do work. The second is the electrolytic mode, which requires an external energy source to drive it. In this mode, the electrochemical cell becomes the load on the galvanic cell, and the electrodes' signs are defined by the polarity of the external power supply.
In a full electrochemical cell, species from one half-cell lose electrons (oxidation) to their electrode, while species from the other half-cell gain electrons (reduction) from their electrode. A salt bridge is used to ionically connect the two half-cells, preventing the solutions from mixing and stopping unwanted side reactions.
A fuel cell is a type of electrochemical cell that reacts hydrogen fuel with oxygen or another oxidizing agent, converting chemical energy to electricity. Unlike batteries, fuel cells require a continuous source of fuel and oxygen to sustain the chemical reaction.
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Primary vs. secondary batteries
Batteries are devices that store and release electricity on demand. They consist of two electrical terminals, the cathode and the anode, separated by a chemical material called an electrolyte. The electrolyte in a battery can be in the form of a paste, a gel, or liquid.
There are two basic types of batteries: primary and secondary. Primary batteries, also called primary cells, are single-use devices that produce current immediately on assembly. They are commonly used in portable devices with low current drain, such as alarm and communication circuits. The electrochemical reactions in primary batteries are not reversible, and the chemical reactants are consumed to produce electricity. Therefore, primary batteries cannot be recharged reliably, and manufacturers recommend against it.
On the other hand, secondary batteries, also known as secondary cells or rechargeable batteries, can be recharged and used multiple times. They are assembled with active materials in a discharged state and must be charged before first use. The electrochemical reactions in secondary batteries are reversible, and the chemical reactants can be restored by running a charging current into the battery. While rechargeable batteries are more costly to purchase, they are more economical to use over time compared to primary batteries.
The oldest form of rechargeable battery is the lead-acid battery, widely used in automotive and boating applications. This type of battery is relatively heavy compared to the amount of electrical energy it supplies. However, its low manufacturing cost and high surge current levels make it a common choice where capacity is more important than weight and handling.
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Frequently asked questions
A battery is a device that stores chemical energy and converts it into electrical energy. It consists of two terminals made of different chemicals, typically metals, the anode and the cathode, and an electrolyte that separates the terminals.
During a discharge of electricity, the chemical on the anode releases electrons to the negative terminal and ions in the electrolyte through an oxidation reaction. The cathode accepts electrons, completing the circuit for the flow of electrons. The electrolyte acts as a medium to allow the flow of electrical charge between the cathode and anode.
An electrochemical battery produces electricity with two different metals in a chemical substance called an electrolyte. One end of the battery is attached to one of the metals, and the other end is attached to the other metal. A chemical reaction between the metals and the electrolyte frees more electrons in one metal than the other.
