1. Impact on battery cycle life
The preparation process of electrode materials greatly affects the cycle life of Polymer Lithium Battery. For example, in the synthesis process of electrode materials, if the method used cannot accurately control the composition and microstructure of the material, it may cause a large volume change of the electrode material during the charge and discharge cycle. Taking the positive electrode material lithium nickel manganese cobalt oxide (NMC) as an example, if the process parameters such as calcination temperature and time during its synthesis are unreasonable, it may cause crystal structure defects, making the structure of the electrode material unstable during the lithium ion insertion and extraction process during battery charging and discharging. This instability will cause the active material to fall off and pulverize, which will lead to rapid attenuation of battery capacity and greatly shorten the cycle life of the battery.
2. Impact on rate performance
The preparation process of electrode materials is closely related to the rate performance of Polymer Lithium Battery. The particle size and distribution of electrode materials are key factors in the preparation process. If the preparation process can obtain smaller and evenly distributed particles, the diffusion path of lithium ions will be shortened during high-rate charging and discharging, thereby improving the rate performance of the battery. For example, in the preparation of graphite, anode material, when ball milling is used, parameters such as ball milling time and ball-to-material ratio will affect the size and shape of graphite particles. When the particle size is appropriate and uniform, lithium ions can be quickly embedded in and out of the graphite interlayer under high current charge and discharge conditions, and the battery can output higher power to meet the needs of high-rate applications.
3. Impact on battery energy density
The preparation process of electrode materials will also affect the energy density of Polymer Lithium Battery. On the one hand, the compaction density of electrode materials is related to the preparation process. During the electrode preparation process, parameters such as coating process (coating thickness, drying conditions, etc.) will affect the compaction density of the electrode. A higher compaction density can accommodate more active substances in a limited battery volume, thereby increasing the energy density of the battery. On the other hand, the preparation process also affects the tap density of electrode materials. For example, for positive electrode materials, if the tap density is increased by improving the synthesis process, more positive electrode materials can be filled in the same battery space, thereby increasing the energy density of the battery.
4. Impact on battery safety
The preparation process of electrode materials also has an important impact on the safety of Polymer Lithium Battery. If impurities cannot be effectively removed during the preparation of electrode materials, these impurities may cause side reactions during the battery charging and discharging process. For example, some metal impurities may catalyze the decomposition of the electrolyte, produce gas, and cause the internal pressure of the battery to increase, increasing the risk of battery bulging, combustion, or even explosion. In addition, the surface state of the electrode material (such as roughness, active sites, etc.) is also affected by the preparation process. If the electrode surface roughness is too large or there are too many active sites, it may accelerate the reaction between the electrode and the electrolyte, affect the thermal stability of the battery, and reduce the safety of the battery.
