FT-100F粉末自动压实密度仪(升级版)FT-100F Powder automatic compaction density instrument (updated version)
压实密度(compacted density)
一. 定义:Definition
压实密度的计算公式:压实密度=面密度/材料的厚度
在锂离子电池设计过程中,压实密度=面密度/(极片碾压后的厚度—集流体厚度) ,单位:g/cm3
Compaction density calculation formula: the compaction density =surface density/ thickness of material
In the process of lithium ion battery design, compaction density = surface density / (The thickness of the pole plate after crushing - current collector thickness), unit: g/cm3
Compaction density is divided into: the cathode compaction density (or is called the Anode compaction density) and the Anode compaction density (or called the Cathode compaction density)
In the process of making lithium ion power battery, The compacting density has a large effect on battery performance.The test results show that the compaction density is closely related to specific capacity, efficiency, internal resistance and the performance of the battery cycle.
It is important to find the optimal compaction density for battery design.Generally speaking, the higher the density, the higher the capacity of the battery, so the compacted density is also seen as a reference indicator of the energy density of the material.
The compaction density is not only related to the size and density of the particle, but also related to the level of the particle, Normally, High compaction density has a good particle normal distribution.It can be said that under certain conditions ,The higher density of the battery, the higher capacity of the battery.
The proper positive electrode compaction density can increase the discharge capacity of the battery, reduce the internal resistance, reduce the loss of polarization, extend the cycle life of battery, Improve the utilization rate of lithium ion batteries. If the The compacted density is too large or too small , It is bad for the embedding of lithium ions.
In the process of the compression of external force, As the movement and deformation of powder, larger gap is filled, The contact area between particles increases, The interatomic appeal and mechanical wedge cooperation between particles will be enhanced, Thus forming a certain density and intensity of compact.
满足标准:GBT 24533-2009 锂离子电池石墨类负极材料,附录L:粉末压实密度的测试方法,
Meet standard: GBT 24533-2009 lithium ion battery graphite type anode materials, appendix L: Test method of powder compaction density,
也可以用于具有类似特性之粉末和颗粒压实密度之测定;上粉末和颗粒测试方法相通。
It can also be used for the determination of powder and particle’s compaction density which have similar properties; The test methods of powder and particle are similar internationally.