How to increase the capacity of lithium-ion batteries?
1. Use materials that can perform better: for example, lithium-rich materials, high-voltage ternary materials, high-voltage lithium cobalt oxide materials, binary materials, etc. for the positive electrode; soft carbon, hard carbon, silicon-tin based compounds, etc. for the negative electrode.
2. Use positive and negative electrode materials with higher compaction density.
3. Use active materials with better adhesion and conductivity: This can reduce the content of adhesives and conductive agents in the dressing, thereby increasing the capacity that a unit mass of dressing can perform; in addition, reducing the amount of adhesives and conductive agents can also improve the compaction and other processing properties of the active materials.
4. Use materials with less thickness rebound: After lithium-ion batteries are cycled, the thickness will rebound to a certain extent; the design should allow for the thickness rebound after cycling; when materials with less thickness rebound are used (based on what we see now, these materials are also materials with good cycle performance), the space saved for thickness rebound can be transferred to the design thickness of the cell, thereby increasing the design capacity of the cell.
Lithium-ion batteries are lightweight, have a large capacity, and are highly stable, making them crucial for consumer electronics, medical devices, equipment manufacturing, and aerospace applications. While battery performance indicators may be consistent during testing, inherent differences between batteries can emerge during use, affecting the overall capacity degradation and safety of the battery pack.
Improving the performance of materials that contribute to the capacity of lithium-ion batteries: This is particularly important for the positive and negative electrode active materials, as it is the most direct way to increase capacity density. Key directions include:
1. Use materials that can perform better: for example, lithium-rich materials, high-voltage ternary materials, high-voltage lithium cobalt oxide materials, binary materials, etc. for the positive electrode; soft carbon, hard carbon, silicon-tin based compounds, etc. for the negative electrode.
2. Use positive and negative electrode materials with higher compaction density.
3. Use active materials with better adhesion and conductivity: This can reduce the content of adhesives and conductive agents in the dressing, thereby increasing the capacity that a unit mass of dressing can perform; in addition, reducing the amount of adhesives and conductive agents can also improve the compaction and other processing properties of the active materials.
4. Use materials with less thickness rebound: After lithium-ion batteries are cycled, the thickness will rebound to a certain extent; the design should allow for the thickness rebound after cycling; when materials with less thickness rebound are used, the reserved space for thickness rebound can be transferred to the design thickness of the cell, thereby increasing the design capacity of the cell.
5. Choose a material system with better performance: Combining materials with poor compatibility will not only reduce the cycle performance of lithium-ion batteries, but may also affect the rate performance and even the performance of the positive and negative electrodes; similarly, when the materials are better matched, performance such as performance, cycle life, and expansion rate may be improved.
