How to choose an agent driver

How to choose an agent driver? This makes the battery design to address an important issue but to solve this problem, we must be clear user performance of lithium iron phosphate specific requirements applicable to electric vehicles on the iron phosphate lithium performance requirements of the Laptop battery and economic needs, for example, we must accurately understand the user for more than eight specific requirements, and use the data to be described. According to specific requirements of the user, we can design to meet the needs of user’s lithium iron phosphate, into the design process, how to use the official driver to improve battery performance is that each designer must address one of the problems.

1 by positive and negative active particle size and morphology of select agent driver. To effectively conducting electrodes to form networks, must be the same as above diagram network driver, it must be driver node, the node by the electrical conductivity of the graphite conductive to act as the particle size particle size in better and near active substances. Fulcrum must be conductive, they must be like octopus tentacles and the particles of active material, such as smoke two, they have a very fine size, there must be a string like morphology, which pivot from the SP -Li to act as the most appropriate. Pivot and the nodes must be a link between the sons, they have good conductivity, have a linear morphology, VGCF and carbon nanotubes specifically to meet these requirements. Therefore, to form positive and negative electrodes of conductive network effectively, you must attach the different morphologies with features different sizes of particles of the agent driver.

2, according to the performance requirements of VGP-BPS10 battery power to select the conducting agent. Depending on the use of lithium iron phosphate, the user must provide magnification different requirements, such as requiring the battery to discharge 10C continuous, 20C pulse discharge. At this time we are negative active material according to the conductivity of the powder (do not attach importance to these data before we can really be measured by four probe method, A123 in its patents and articles published in the first mention of this setting), the user of the battery capacity required to choose than the official driver. If you are negative active material conductivity is low, to achieve high magnification, you must choose a high conductivity of the agent driver. At the same time using several cases of conductive agents, we must improve the rate of high conductivity of the agent driver.

3, as the performance of battery power and high and low temperature performance requirements choose Agent driver. In the commonly used conductive agent, carbon nanotubes not only a good conductivity, but also has good thermal conductivity, but also the electric double layer effect. (Which is the role of lithium-ion batteries in other literature, have a very detailed description) in particular, thermal conductivity, and phosphate type of high power lithium iron when it is work d ’significant expansion of current payments, the VGP-BPS9/B battery internal resistance and polarization for the reasons for releasing lots of heat, heat the need for rapid dissemination of these, otherwise it will lead to incidents of battery safety. Therefore, often in great working condition magnification and high temperature, the professional status of lithium iron phosphate to improve the ratio of one officer conductive carbon nanotubes is necessary.

4, as the total cost of the battery must choose the agent driver. Commonly used agent in the drivers mentioned above, SP cheapest, followed by the electrical conductivity of graphite, and then followed by the super-350G conductive carbon black, is the most expensive carbon nanotubes and VGCF, up to 4000-5000 yuan per kg. Thus, the premise of meeting the needs of users, to minimize production costs of the battery, use low price as much as possible conductive agent.

5, depending on the ionic conductivity were asked to choose an official driver. To improve the ionic conductivity electrode, the electrode must have a good ability to absorb liquids and appropriate porosity. This requires us to use large area, porosity, high conductive agent. Agent driver common table above we can see the technical specification, SP-Li and the carbon nanotubes have all these characteristics.

6, to reasonably determine the amount of conductive agent to join. Agent driver in improving the performance of the battery power is concerned, although an important but not join the more the better performance of the battery power. Mi Gao Rui Shite company was adding up the amount of conductive agent specialized experience, experiments show that: when the officer conducting electrode joining reached 8%, then add the agent conduction, the battery of improving the power output is not produced visible results.