The global focus on new energy solutions has intensified, with electric vehicles (EVs) at the forefront of this revolution. However, a critical challenge lies in the development of high-performance storage batteries, an essential component for EVs and a key bottleneck in their widespread adoption. Countries around the world are therefore prioritizing research and development in this area as a vital aspect of new energy progression.
The quest for high capacity, high power, long life, and eco-friendliness defines the pursuit in the new energy sector, particularly regarding power batteries. Lithium-ion batteries, with their high energy density, have become the preferred choice for EVs. Yet, they face limitations in power density, low-temperature performance, and cycle life. Super capacitors, operating on the principle of double-layer capacitance, offer advantages in power density, temperature characteristics, and longevity. However, their energy density is significantly lower than lithium-ion batteries, about 5%, insufficient for the power demands of EVs.
Overcoming the individual shortcomings of lithium-ion batteries and super capacitors, while combining their strengths, is a goal tirelessly pursued by researchers in the battery field. Liaoning Liyuan New Energy Co., Ltd. has independently developed a capacitive lithium-ion battery with this aim in mind.
This innovative battery integrates the double-layer physical storage principle of super capacitors with the intercalation/deintercalation chemical storage principle of lithium-ion batteries, creating a unique energy storage device - the "Capacitive Lithium-Ion Battery". This design involves a harmonious fusion of super capacitor electrode materials with those of lithium-ion batteries. The company has also optimized the electrolyte formula, battery structure, manufacturing process, and raw materials to meet the device's chemico-physical working principles and high-power operational needs.
Capacitive lithium-ion batteries can be categorized based on the integrated battery material: lithium iron phosphate, lithium manganese oxide, and ternary lithium-ion batteries. The key technological challenges in their development include electrode composition design, electrolyte component design, working voltage matching, structural design compatible with performance, and application technology.
The variety of capacitive batteries encompasses: 1. Electrolytic Capacitor + Super Capacitor: Electrolytic Capacitor + EDLC, Electrolytic Capacitor + Pseudocapacitor; 2. Battery + Super Capacitor: Lead Acid Battery + EDLC (Inorganic Capacitive Lithium-Ion Battery), Nickel-Metal Hydride Battery + EDLC (Inorganic Capacitive Lithium-Ion Battery), Lithium Battery + Super Capacitor (Organic Capacitive Lithium-Ion Battery).
The primary performance characteristics of capacitive lithium-ion batteries include: energy density ranging from 60Wh/Kg to 120Wh/Kg (customizable); power density between 1300W/Kg to 3000W/Kg (customizable); a cycle life of 2000 to 5000 cycles (customizable); charging time from 0.5 to 2 hours (customizable); operational temperature range from -30℃ to 60℃; and a working voltage range of 2.5 to 3.6V (customizable). These batteries also offer enhanced safety and are environmentally friendly, with no pollution concerns.
This innovative development in capacitive lithium-ion batteries signifies a major leap in energy storage technology, offering a potent combination of the strengths of both lithium-ion batteries and super capacitors. This advancement holds the promise of transforming the energy storage landscape, particularly for electric vehicles, ushering in a new era of efficiency, sustainability, and environmental responsibility.