Electricity generated from solar energy provides a huge potential for meeting energy demands of the future. Solar energy storage devices therefore are very critical for effectively leveling the cyclic nature of solar energy.
One potential electrical energy storage device is a battery which can store energy in the form of chemical reactants. The Lithium Ion Battery generally store more energy per unit mass than electrochemical capacitors. The reason for this is because batteries use an electrochemical process known as Faradaic processes. This is the process where the transfer of charge occurs between the interface of a batteries electrode and electrolyte solution. This is the reduction and oxidation of the species. When the battery is charged or discharged, the redox reactions change the molecular or crystalline structure of the electrode material. However, this affects the stability of the electrodes therefore batteries need to be replaced after thousands of charge- discharge cycles. That is why we need new batteries for our electrical devices every once in a while 🙂.
The Lithium Ion Battery is composed of an anode, a cathode, and an electrolyte that allows for ionic conductivity. It also has separators that separate the anode and the cathode to prevent explosions and short circuits.
Amongst the rechargeable batteries that are commercially available today the best one so far is the Lithium Ion Battery. They are used in many devices including: hearing aids, Bluetooth headsets, very small MP3 players, medical devices, digital cameras, MP3 players, e-readers, cell phones, smart phones, notebook computers, power tools, portable DVD players, commercial aircraft auxiliary units, satellites, military applications, and hybrid electric vehicles. These batteries are the most important energy storage device of the future.
In the discharge process of the Lithium Ion Battery, the anode of is electrochemically oxidized, this causes the Li ions to be released into the electrolyte. During this process, electrons move through the external circuit and travel towards the cathode. Meanwhile the Li ions travel across the electrolyte and reimburse for the negative charge that is flowing into the cathode from the external circuit. This causes the Li ions to be absorbed by the cathode. When we charge the battery this is reversed. Hence, the name the rocking chair battery!