# Storage of electrical energy: Batteries and Supercapacitors

## TL;DR

This paper reviews the historical development and recent advances in electrical energy storage technologies, focusing on batteries and supercapacitors, highlighting technological breakthroughs and potential future applications.

## Contribution

It provides a comprehensive overview of the evolution of batteries and supercapacitors, emphasizing recent progress in supercapacitor technology as a promising energy storage solution.

## Key findings

- Supercapacitors have achieved significant increases in capacitance.
- Recent breakthroughs suggest supercapacitors could soon rival batteries for storage.
- Batteries remain the most widely used energy storage device.

## Abstract

In this article we shall discuss the development of electrical storage system. Since the early days of electricity people have tried various methods to store electricity. One of the earliest device was a simple electrostatic capacitor that could store less than a micro Joule of energy. The battery has been the most popular in storing electricity as it has a higher energy density. We will discuss the development of batteries and their working principle. Although capacitors has never been thought of as a practical device for electricity storage, in the recent years there has been tremendous progress in building capacitors with huge capacitance and it may soon be possible to use it as storage device. We shall discuss the technological breakthroug in supercapacitor as a storage device.