Description:FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)

Title: A HIGH-CAPACITY SUPERCAPACITOR CELL AND METHOD THEREOF

APPLICANT DETAILS:
(a) NAME: WESTECHPOWER MANAGEMENT PRIVATE LIMITED
(b) NATIONALITY: Indian
(c) ADDRESS: 162B, Tower Line Road, Triveni Nagar, Talawade, Pune – 411 062,
Maharashtra, India

PREAMBLE TO THE DESCRIPTION:
The following specification particularly describes the nature of this invention and the manner in which it is to be performed.

A HIGH-CAPACITY SUPERCAPACITOR CELL AND METHOD THEREOF
FIELD OF THE INVENTION:
The present invention relates to an electrical energy storage device, specifically high-capacity electrical double-layer capacitors (EDLCs), also known as supercapacitors.

BACKGROUND OF THE INVENTION:
The following background discussion includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
The existing commercial Electrical Double-Layer Capacitors (EDLCs) has limited energy density. Further, it is difficult to maintain their characteristic high-power capability and long cycle life. The are several patent literatures which tried to solve the problem of energy density, for example, US20180301744A1 discloses an electrochemical device which shows excellent high-temperature storage characteristics. A composition for an electrochemical device electrode contains a conductive material, a particulate polymer including a polar group-containing monomer unit, a water-soluble polymer, and water. The polar group-containing monomer unit is at least one selected from the group consisting of a hydrophilic group-containing monomer unit and a nitrile group-containing monomer unit.
Further, CN105869912B discloses method and applications of starch base Monodispersed activated carbon microballon material. The use of starch as raw material, first gelatinization obtains translucent colloid, then carries out hydro-thermal process and obtain hydro-thermal carbon coke, and the activated carbon microballon material that Monodispersed is made in carbonization-activation processing is then carried out to hydro-thermal carbon coke. Prepared activated carbon microballon is 0.2~3 μm a diameter of, size tunable, disperses uniform, specific surface area for 1000~2000m2/ g and its size is controllable. It is applied to function admirable in ultracapacitor, specific capacity reaches 208F/g, power density 998.6W/Kg, energy density 28.8Wh/Kg under the current density of 1A/g, and the specific capacitance under 5A/g current densities reaches 187F/g, power density 4540W/Kg, energy density 21.4Wh/Kg.
In another document, KR101439154B1 discloses nanoink and manufacturing method thereof, a thin-film ultracapacitor electrode and a manufacturing method thereof. More particularly, the present invention relates to nanoink including biomass and manufacturing method thereof, a thin-film ultracapacitor electrode and a manufacturing method thereof. A method of manufacturing ink according to an embodiment of the present invention includes a step (1) of mixing biomass, water, and activation catalytic and manufacturing a mixture solution; a hydrothermal carbonization step (2) for mixture solution; and a step (3) of filtering a hydrothermal-carbonized mixture solution and manufacturing nanoink by using a filtered solution.
However, the abovementioned literature and existing art failed to provide supercapacitors with has maximum energy density. Thus, there is a need of a supercapacitor that has higher capacitance, energy density, and overall performance, while maintaining the high-power capability.

OBJECTIVE OF THE INVENTION:
The primary objective of the present invention is to overcome the drawback associated with prior art.
Another objective of the present invention is to provide a supercapacitor with significantly higher capacitance and energy density than conventional EDLCs.
Another objective of the present invention is to provide a supercapacitor with high power capability and long cycle life.

SUMMARY OF THE INVENTION:
In an aspect the present invention provides a high-capacity supercapacitor cell comprising:
a) a cylindrical cell made of an aluminium can whose top and bottom portion is covered with a lid;
b) a jelly-roll type electrode assembly; and
c) an electrolyte made of an acetonitrile and a pyrrolidinium salt;
wherein the electrode composition comprises activated carbon, conducting carbon, carboxymethyl cellulose and potato starch.
In an embodiment, the activated carbon has a ratio of 81.2% in which graphene has ratio of 4.5-5%.
In an embodiment, the conducting carbon has a ratio of 13.8%.
In an embodiment, the carboxymethyl cellulose has a ratio of 3.9%.
In an embodiment, the potato starch has a ratio of 1.1%.
In an embodiment, the styrene-butadiene rubber (SBR) is adapted to interchangeably used in place of potato starch.
In an aspect the present invention provides a method of preparation high-capacity supercapacitor cell comprising steps of:
a) making a cylindrical cell made of an aluminium in inert atmosphere;
b) filling electrolyte in the cylindrical cell made of acetonitrile and pyrrolidinium salt; and
c) installing jelly-roll type electrode assembly inside the cylindrical cell.

DETAILED DESCRIPTION OF DRAWING/S:
To further clarify the advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of their scope. The invention will be described and explained with additional specificity and detail with the accompanying drawings in which:
Fig 1. illustrates supercapacitor of the present invention
Fig 2. illustrates process of the present invention

DETAILED DESCRIPTION:
For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated system, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates.
It will be understood by those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of the invention and are not intended to be restrictive thereof.
The terms “comprises”, “comprising”, “includes”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a setup, device or method that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or device or method. In other words, one or more elements in a system or apparatus proceeded by “comprises... a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or method.
The invention provides a supercapacitor with significantly higher capacitance and energy density than conventional EDLCs.
In an embodiment, the present invention provides a supercapacitor with high power capability and long cycle life.
In an embodiment, the invention provides a high-capacity supercapacitor cell comprising:
a) a cylindrical cell made of an aluminium can whose top and bottom portion is covered with a lid;
b) a jelly-roll type electrode assembly; and
c) an electrolyte made of an acetonitrile and a pyrrolidinium salt;
wherein the electrode composition comprises activated carbon, conducting carbon, carboxymethyl cellulose and potato starch.
In an embodiment, the activated carbon has a ratio of 81.2% in which graphene has ratio of 4.5-5%.
In an embodiment, the conducting carbon has a ratio of 13.8%.
In an embodiment, the carboxymethyl cellulose has a ratio of 3.9%.
In an embodiment, the potato starch has a ratio of 1.1%.
In an embodiment, the styrene-butadiene rubber (SBR) is adapted to interchangeably used in place of potato starch.
In an aspect the present invention provides a method of preparation high-capacity supercapacitor cell comprising steps of:
a) making a cylindrical cell made of an aluminium in inert atmosphere;
b) filling electrolyte in the cylindrical cell made of acetonitrile and pyrrolidinium salt; and
c) installing jelly-roll type electrode assembly inside the cylindrical cell.
In an embodiment, the super capacitor of the present invention has cylindrical cell with dimensions: 60 mm outer diameter, 140 mm height that includes jelly-roll electrode assembly packed with aluminium can and lid.
In an embodiment, the super capacitor has jelly-roll electrode. The electrode has composition of activated carbon: 81.2% by weight (inclusive of 4.5 - 5% tailored Graphene), conducting carbon: 13.8% by weight, carboxymethyl cellulose (CMC) binder: 3.9% by weight and additional binder: 1.1% by weight, either potato starch or styrene-butadiene rubber (SBR). Further, the cell of the present invention uses electrolyte has acetonitrile and pyrrolidinium-salt.
In an embodiment, the supercapacitor of the present invention has following specification:
• Nominal capacitance: 5100 F
• Improved energy density: 6.3 Wh
• High power capability : 10.7 KW
• Long cycle life: >500,000 cycles
• Wide operating temperature range: -40°C to 65°C
In an embodiment, the supercapacitor of the present invention offers higher capacitance: 5100 F vs 3000-3400 F in the same cell size, increasing energy storage by ~30%, improved energy density: Targeting 6.3 Wh compared to 4.25 Wh/kg for conventional EDLCs, enhanced temperature performance: Stable operation from -40°C to 65°C, longer cycle life: Expected >500,000 cycles, surpassing many existing alternatives and maintained high power capability despite increased energy density.
Experiments:
1. Electrode material optimization:
Multiple activated carbon sources were evaluated, leading to the selection of a high-surface area carbon with optimized pore structure. The addition of 4.5-5% tailored graphene was found to significantly improve conductivity and capacitance.
2. Binder system development:
The inventors compared traditional PTFE binders with various combinations of CMC and other binders. The CMC + potato starch/SBR combination showed superior adhesion and flexibility.
3. Electrolyte formulation:
The inventors tested various acetonitrile-based electrolytes with different salts, Pyrrolidinium-based salts demonstrated improved stability and voltage range.
4. Cell construction optimization:
The inventors experimented with different jellyroll winding tensions and electrode thicknesses. The 60mm x 140mm format was selected as optimal for capacity and manufacturability.
5. Performance testing:
Prototype cells underwent extensive cycling tests, rate capability assessments, and temperature performance evaluations.
Experiments showing the necessity of the specific process:
1. Electrode composition:
Cells made without the tailored graphene additive showed 15-20% lower capacitance.
Deviating from the specified carbon/binder ratios by more than 2% resulted in decreased cycle life or power capability.
2. Binder system:
Using only CMC without the additional potato starch/SBR led to electrode cracking during cycling.
PTFE-only binders resulted in 10% lower capacitance due to reduced active material utilization.

3. Electrolyte:
Standard tetraethylammonium tetrafluoroborate (TEA BF4) in acetonitrile showed voltage limitations and reduced cycle life compared to our pyrrolidinium-based formulation.
4. Manufacturing process:
Electrode slurries mixed under atmospheric conditions (instead of inert atmosphere) showed 5-8% lower capacitance due to partial oxidation of carbon surfaces.
Inadequate drying of electrodes (less than specified time/temperature) resulted in poor electrolyte wetting and 10-15% capacity loss.
5. Cell assembly:
Cells assembled without stringent moisture control (<20 ppm H2O) exhibited accelerated aging and capacity fade.
These experiments demonstrate that deviating from our specific invention process results in significantly reduced performance, highlighting the criticality of each aspect of our 5100 F supercapacitor cell design and manufacturing process.
In an embodiment, the supercapacitor of the present invention has application areas for our 5100 F supercapacitor cell invention. The high capacity, improved energy density, and enhanced performance characteristics of this supercapacitor make it suitable for a wide range of applications like renewable energy systems, electric and hybrid vehicles, industrial applications, Public Transportation, aerospace, consumer electronics, Medical Devices, Smart Grid and Power Quality, Robotics and Automation, Military and defence, Construction and Mining and Agriculture:
The versatility, high power capability, and improved energy density of present invention 5100 F supercapacitor cell make it an attractive option for these diverse applications, potentially replacing or complementing traditional battery systems in many scenarios.
Many modifications and other embodiments of the invention set forth herein will readily occur to one skilled in the art to which the invention pertains having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the invention is not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired from the practice of the invention. The embodiments were chosen and described in order to explain the principals of the invention and its practical application to enable one skilled in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated.
, Claims:We Claim:
1. A high-capacity supercapacitor cell comprising:
a) a cylindrical cell made of an aluminium can whose top and bottom portion is covered with a lid;
b) a jelly-roll type electrode assembly; and
c) an electrolyte made of an acetonitrile and a pyrrolidinium salt;
wherein the electrode composition comprises activated carbon, conducting carbon, carboxymethyl cellulose and potato starch.
2. The high-capacity supercapacitor cell as claimed in claim 1, wherein the activated carbon has a ratio of 81.2% in which graphene has ratio of 4.5-5%.
3. The high-capacity supercapacitor cell as claimed in claim 1, wherein the conducting carbon has a ratio of 13.8%.
4. The high-capacity supercapacitor cell as claimed in claim 1, wherein the carboxymethyl cellulose has a ratio of 3.9%.
5. The high-capacity supercapacitor cell as claimed in claim 1, wherein the potato starch has a ratio of 1.1%.
6. The high-capacity supercapacitor cell as claimed in claim 1, wherein a styrene-butadiene rubber (SBR) is adapted to interchangeably used in place of potato starch.
7. A method of preparation high-capacity supercapacitor cell comprising steps of:
a) making a cylindrical cell made of an aluminium in inert atmosphere;
b) filling electrolyte in the cylindrical cell made of acetonitrile and pyrrolidinium salt; and
c) installing jelly-roll type electrode assembly inside the cylindrical cell;
8. The method as claimed in claim 7, wherein process of preparing jelly-roll type electrode comprises:
a) incorporating graphene (4.5-5%) with activated carbon in the electrode composition; and
b) combining binder comprises carboxymethyl cellulose CMC with either potato starch or styrene-butadiene rubber SBR.