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The present and future of lithium battery anode and cathode

2019-04-03
 
The present and future of lithium battery anode and cathode materials
 
Early lithium ion batteries had lithium metal electrodes but why didn't they use them?The problem of cathode lithium dendrite has not been solved, and there have been too many safety accidents before the battery had to give up this ideal anode material.Nowadays, there are only two kinds of large-scale commercial anode materials, namely graphite carbon materials and LTO.Other anode materials include Si, Sn and other alloy anode materials.
 
1. Carbon anode materials
 
Carbon anode material is a general term, generally can be divided into three categories: graphite, hard carbon, soft carbon anode.
Graphite can be divided into artificial graphite, natural graphite, mesophase carbon microspheres.
 
2. Lithium titanate LTO
 
Lithium titanate materials have also been commercially used at present, among which the domestic representative battery enterprises are the recently popular miss dong's acquisition of zhuhai yinlong and micro macro power.
 
LTO material structure zero strain is considered to be a safer and longer life anode material than carbon.But the same person is not perfect, things are not perfect, lithium titanate negative lithium ion battery in the charging and discharging and storage process due to water, impurities, interface reaction is extremely easy to occur gas inflation, 200ppm and 500ppm water caused by the battery expansion rate of 16% and 33%, respectively, with the increase in water content, the battery gas production more and more.In the first time into the water in the ordinary graphite electrode around the potential 1.2 V decomposition, to absorb moisture and LTO electrode after into may still exist, is mainly the LTO work potential higher than 1.3 V, the remaining PF6 - reaction of water and electrolyte POF3, POF3 chemical catalytic carbonate decomposition, then produce the CO2, it is the main gas source inflatable.
 
3. SiC and SiO based materials
 
Due to the continuous development of battery technology and a variety of applications such as consumer batteries, power batteries have increasingly high energy density requirements, and need high energy density anode and cathode materials.