Lithium polymer batteries stand out for their high energy capacity, lightweight design, and compactness. These batteries consist of a positive electrode, a negative electrode, and an electrolyte employing polymer materials, offering increased stability and reliability due to the absence of excess electrolytes.
Definition and Introduction:
A lithium polymer battery integrates polymer materials within its components, primarily in the cathode and electrolyte. It replaces conventional liquid electrolytes with solid or colloidal polymer electrolytes, enhancing stability and safety. The polymer matrix, often composed of HFP-PVDF, PEO, PAN, or PMMA, contributes to its distinctive properties.
Classification of Li Polymer Batteries:
- Solid Polymer Electrolyte Lithium-ion Battery
- Gel Polymer Electrolyte Lithium-ion Battery
- Polymer Lithium-ion Batteries
Differences from Ordinary Lithium Batteries:
- Raw Materials: While ordinary lithium batteries use liquid or colloidal electrolytes, lithium polymer batteries utilize solid or colloidal polymer electrolytes.
- Safety: Lithium batteries may risk explosion due to overheating, whereas lithium polymer batteries typically expand without explosion.
- Shape: Lithium polymer batteries are ultrathin, granting them a lightweight advantage.
- Production Process: Lithium polymer batteries are thinner and require different production processes compared to ordinary batteries.
- Capacity: Due to technical constraints, lithium polymer batteries generally offer smaller capacities.
Advantages of Lithium Polymer Batteries:
- Enhanced Safety: Less risk of explosion or combustion during overheating.
- Ultrathin Design: Significantly thinner and lighter than conventional batteries.
- High Specific Energy: Offers high energy density.
- Wide Operating Temperature Range: Performs well across various temperature conditions.
- Stable Working Voltage: Maintains a consistent voltage of around 3.6V.
- Low Internal Resistance: Achieves minimal internal resistance, often below 35 mΩ.
Disadvantages of Lithium Polymer Batteries:
- Limited Versatility: Possesses less flexibility in use.
- Cost Implications: Customized appearances increase production costs.
- Susceptibility to Damage: Damage impacts battery lifespan significantly.
- High Current Discharge: Not as efficient as cylindrical 18650 batteries in high current discharge scenarios.
Applications of Lithium Polymer Batteries:
Lithium polymer batteries, prized for safety, longevity, and low self-discharge, find applications in various electronic devices and new energy vehicles. They are extensively used in smartphones, tablets, laptops, smartwatches, and other high-end electronics due to their higher energy density and compact size, which aid in device performance and design.
Polymer lithium-ion batteries, part of the new energy landscape, possess traits like high energy density and lightweight design. With their application spanning various industries—3C, new energy vehicles, and energy storage—they promise high-quality, efficient, and environmentally friendly developments across the lithium battery ecosystem.
In Conclusion, lithium polymer batteries offer a compelling mix of advantages and drawbacks, finding their niche in numerous electronic applications and holding promise for continued advancements in energy storage and production technologies.