Home/ Projects / Miscellaneous/ Techno innovations/ Paper Battery - The Working and Construction of Future Batteries
In August 2007 at Rensselaer Polytechnic Institute, a research team conducted by Dr. Robert Linhardt; Dr.Omkaram Nalamasu and Dr.Pulickel Ajayan , developed the Paper battery. In December 2009 at Stanford University, Yi Cui and his research team successfully invented the original working prototype that provides 1.5 V as its terminal voltage. A paper battery is an ultra-thin, environmentally friendly and flexible energy storage battery made of carbon nano tubes and paper or cellulose. The paper battery can be performed as a super capacitor and also it can be used as a high energy battery. The paper battery is also known as Nano Composite Paper since it is constructed from carbon nano tubes and paper.
Limited life time: The primary batteries can’t be recharged like secondary batteries. They irreversibly convert chemical energy into the electrical energy. Although the secondary batteries may be rechargeable, the life time may be very short and also they are very costlier than the primary ones. The paper battery provides a better advantage of all these problems.
Environmental Influence: The extensive use of batteries can generate environmental pollutions like toxic metal pollutions etc. But the Paper batteries are environmentally friendly and can decompose very easily without any abuse.
A paper battery is an ultra-thin, environmentally friendly and flexible energy storage battery made of carbon nano tubes and paper or cellulose. The functioning of paper Batteries is similar to that of a normal chemical battery. In normal cases, conventional batteries may be easily damaged by corrosion and also sometimes they required a bulky housing. But the paper batteries are non-corrosive, non-toxic and light-weight than the normal batteries.
Paper Battery= Carbon Nanotubes + Cellulose (Paper).
Carbon is accomplished with many allotropes. Some renowned form of carbon allotropes are diamonds, graphite etc. Currently different forms of allotropes of carbon have been ascertained and researched like carbon nano tubes. In Carbon nanotubes, each carbon atom is amalgamating with all other three carbon atoms in order to form a nanosize cylindrical structure. The nanosize cylindrical structure along with its novel properties makes the carbon nanotube conceivably beneficial in wide range of applications in materials science, electronics, nanotechnology and optics. The carbon nanotube unveils outstanding strength along with its distinctive electrical properties also the carbon nanotube is an effective heat conductor too.
1. First Method: First fabricate the cathode and anode with Zinc and manganese dioxide respectively. With the help of a standard silk screen printing press, these batteries are printed on to the surface of a paper. After that this printed paper is infused with the carbon nanotubes (electrode). Now let this printed paper to dip into the electrolyte (Ionic liquid solution).
2. The second method: This method is little complex than the first method. Here silicon is used as the substrate. And the nanotube grows on this substrate. Cellulose is used to fill the gaps in the matrix substrate and also to form a combination with the nanotubes. When the matrix dried, the amalgamated nanotubes and cellulose is striped off. Thus we can create paper sheets having layers of Carbon nanotubes. By combining these two sheets together, we can construct a super capacitor with an ionic solution like urine, sweat or human blood as an electrolyte.
3. The Third Method: This method is comparatively simple and can be fabricate in the laboratory.
The internal performance of paper batteries is identical to that of a traditional battery by generating a voltage about 1.5V. We can recall the working principles of a traditional batteries where ions (+ ve charged particles) and electrons (- ve charged particles) moves between the electrodes, anode (+ve electrode) and cathode (-ve electrode). Due to the flow of electrons from cathode to anode, current start flowing from anode to cathode along the conductor.
Similarly in Paper Batteries, the metal (Lithium) is used as the anode and carbon nanotubes as cathode and also the paper or cellulose is used as the separator. Due to the chemical reaction between the electrolyte and carbon, electrons are generated. Similarly due to the chemical reaction between electrolyte and metal, ions are generated. These generated electrons starts flow through the external circuit from cathode to the anode.
Paper Battery can shows favorable for applications where size and portability is the major necessity. Most modern electronic devices like digital watches, smart cards etc. facilitate the necessity of ultra-thin batteries which are nontoxic, flexible and long lasting. The Paper battery can be rolled, twisted, folded and even cut into your desired shape and size without any drop in its efficiency. The applications of Paper battery are given below.