Beatrice Lang
Batteries are a common source of electricity that powers many of our everyday devices, from phones and laptops to cars and industrial-grade cleaning machines. They are devices that store chemical energy and convert it to electrical energy. The invention of the battery is credited to Italian scientist Alessandro Volta in 1800, who built a stack of copper and zinc plates separated by brine-soaked paper disks that produced a steady electric current. This was the first battery to prove that electricity could be stored and converted on demand.
| Characteristics | Values |
|---|---|
| What is a battery? | A device that stores chemical energy and converts it to electrical energy. |
| How does a battery work? | The chemical reactions in a battery involve the flow of electrons from one material (electrode) to another, through an external circuit. |
| What is the purpose of a battery? | To balance the flow of electrons, charged ions also flow through an electrolyte solution that is in contact with both electrodes. |
| What are the different types of batteries? | Primary (non-rechargeable) and secondary (rechargeable) batteries. |
| What is the difference between primary and secondary batteries? | Primary batteries produce current immediately on assembly and are used for devices with low current drain. Secondary batteries can be discharged and recharged multiple times using an applied electric current. |
| What is the history of batteries? | The first electrochemical battery was built by Italian physicist Alessandro Volta in 1800. |
| What are some applications of batteries? | Batteries are used in various devices, from miniature cells in hearing aids and wristwatches to large battery banks providing emergency power. They are also essential for electric vehicles and integrating renewable energy sources. |
| What are the challenges with batteries? | Battery technology is still being improved for higher energy storage capacity, faster charging, and safer designs. |
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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 accepts, stores, and releases electricity on demand. 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 refers to the force at which the reaction driving the battery pushes electrons through the cell.
The higher the voltage, the more work the same number of electrons can do. Current refers to the number of electrons passing through any point of a circuit at a given time. The higher the current, the more work it can do at the same voltage. Power is calculated by multiplying voltage and current. A high-capacity battery will be able to last longer before running out of current.
Rechargeable batteries can be discharged and recharged multiple times by reversing the flow of electrons and ions through the circuit and electrolyte. During recharging, the replacement of negative and positive ions from the electrolyte back onto the relevant electrode is not perfect, and each charge cycle degrades the electrodes a little more, causing a loss of performance over time.
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The invention of batteries
Batteries are devices that store chemical energy and convert it to electrical energy. The invention of the battery as we know it is credited to the Italian scientist Alessandro Volta in 1800. He built the first electrochemical battery, the voltaic pile, to prove a point to another Italian scientist, Luigi Galvani.
In 1780, Galvani showed that the legs of frogs suspended on brass hooks would twitch when prodded with a probe made of another type of metal. He believed that this was caused by 'animal electricity' from within the frog's tissues. Volta, while initially impressed with Galvani's findings, later believed that the electric current came from the two different types of metal and was being transmitted through the frog.
To prove his hypothesis, Volta stacked discs of copper and zinc, separated by cloth soaked in brine (salty water). Wires connected to either end of the stack produced a continuous, stable current. Each cell produced 0.76 volts, and the more cells that were stacked together, the greater the voltage. Volta believed that his cells were an inexhaustible source of energy, but Michael Faraday showed in 1834 that this was not the case.
The Daniell cell, invented in 1836 by British chemist John Frederic Daniell, was the first practical source of electricity. It provided a longer and more reliable current than the voltaic cell and soon became the industry standard, especially with the new telegraph networks. In 1868, a Frenchman named Georges Leclanché invented the "Leclanché cell", the origin of today's dry batteries.
In 1888, German inventor Carl Gassner created a battery with no risk of the solution spilling, which became known as the "dry cell" or "dry battery". In 1899, Swedish engineer Waldemar Jungner invented the nickel-cadmium battery, considered the origin of today's storage battery. In 1900, Thomas Edison invented the nickel-iron storage battery, also known as the Edison battery.
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Battery chemistry
The chemistry of a battery involves the storage of energy in chemical form and its conversion to electrical energy when required. This process involves 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.
The battery consists of two electrical terminals, the cathode (positive end) and the anode (negative end), separated by a chemical material called an electrolyte. The cathode and anode are made of different metals, which produce a reaction with different standard potentials. The electrolyte facilitates the reactions between the cathode and anode.
When the battery is charging, electrons move from the cathode to the anode, increasing the chemical potential energy. During discharge, the electrons move in the opposite direction, converting the chemical potential energy to electricity in the circuit and discharging the battery. The oppositely charged ions move inside the battery through the electrolyte to balance the charge of the electrons moving through the external circuit.
The materials used for the cathode, anode, and electrolyte impact the battery's performance. For example, lithium-ion batteries use lithium cobalt oxide for the positive electrode and carbon for the negative electrode, allowing for the smooth movement of lithium ions. The choice of materials also affects how much energy the battery can store and how quickly it discharges.
Different types of batteries, such as alkaline batteries, lithium-ion batteries, and lead-acid batteries, have different chemistries and performance characteristics. Alkaline batteries, for instance, contain an alkaline electrolyte of potassium hydroxide, which can leak if the battery is damaged. Lithium-ion batteries, on the other hand, are known for their high energy density, long lifespan, and rechargeability.
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Battery recharging
Batteries are devices that store chemical energy and convert it to electrical energy. They are coupled with an external circuit to accept, store, and release electricity on demand. 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.
When a battery is connected to an external electricity source, the chemical reaction that occurred during discharge is reversed, recharging the battery. This process involves sending positive ions released from the anode back into the electrolyte and back to the anode, along with the electrons that the cathode took in. This process primes the system, allowing the battery to be ready to run again once recharged.
Secondary batteries, also known as rechargeable batteries, can be discharged and recharged multiple times using an applied electric current. Examples include lead-acid batteries used in vehicles and lithium-ion batteries used in portable electronics such as laptops and mobile phones. However, it is important to note that secondary batteries are not indefinitely rechargeable due to the dissipation of active materials, loss of electrolytes, and internal corrosion.
The process of recharging a car battery involves several steps. Firstly, it is important to verify that no current is flowing through the charger before connecting it to the battery terminals. The red clamp of the charger is connected to the positive terminal, while the black clamp is connected to the negative terminal. The clamps should be secured and wiggled slightly to ensure a good connection. The charger is then turned on, and the amperage is selected. Higher amperage results in faster charging, while lower amperage is more gentle on the battery and extends its life. After charging, the charger is shut off, unplugged, and the cables are removed, starting with the negative clamp.
It is also important to note that some car batteries may need to be removed from their holding trays before charging. Additionally, all car electronics should be powered down, including interior lights and the radio. Regular battery checks and maintenance can help ensure optimal battery performance and extend its lifespan.
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Battery demand and applications
Batteries are an essential component of modern life, powering everything from portable devices to electric vehicles (EVs). They are a critical piece of technology that enables us to store chemical energy and convert it to electrical energy.
The demand for batteries, particularly lithium-ion batteries, is expected to soar in the coming years. Between 2010 and 2018, battery demand grew by 30% annually, and this trend is projected to continue, with an estimated 25% growth rate leading up to 2030. The number of gigawatt-hours (GWh) required is expected to increase from 700 GWh in 2022 to around 4.7 TWh by 2030. The vast bulk of this demand will come from mobility applications, such as electric vehicles, with about 4,300 GWh needed for this sector alone.
The rise in demand for EVs is driven by consumer interest in greener technologies and government support for battery storage and EV adoption. Global investment in EV batteries has surged significantly, with China, Europe, and the United States accounting for over 90% of the total. China currently leads the battery supply chain, but growth is expected to be highest in the EU and the United States due to regulatory changes and the localization of supply chains.
To meet the growing demand for batteries, advancements in battery technology and chemistry are being pursued. Researchers are working on increasing cell energy density, exploring new active material chemistries like solid-state batteries, and improving production technologies. The development of new materials that can dramatically improve energy storage capacity is also a key focus. These advancements aim to create batteries that are safer, charge faster, last longer, and have greater energy storage capacity.
The applications of batteries extend beyond just portable devices and electric vehicles. They are becoming integral to the power sector, particularly in utility-scale and behind-the-meter applications. Battery storage in power systems provides short-term energy shifting, delivers ancillary services, alleviates grid congestion, and helps expand access to electricity. The integration of renewable energy sources, such as solar and wind, into the electricity supply also relies on advancements in battery technology and energy storage solutions.
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Frequently asked questions
A battery is a device that stores chemical energy and converts it to electrical energy.
Batteries use chemical potential to store energy. They consist of two electrical terminals called the cathode and the anode, separated by an electrolyte. Electrons flow from the negative end of the battery to the positive end through an external circuit.
The invention of the battery is credited to Italian scientist Alessandro Volta in 1800. The Daniell cell, invented in 1836, became the first practical source of electricity.
Yes, secondary batteries can be recharged by reversing the chemical reaction that occurred during discharge. This is done by sending energy back into the battery through an external electricity source.
Batteries are used in a wide range of applications, from powering small devices like hearing aids and wristwatches to providing emergency power for telephone exchanges and computer data centres. They are also commonly used in vehicles and portable electronics such as laptops and mobile phones.
