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High capacity silicon carbon negative electrode

2017-12-06 10:15:12 Dongjia new materials technology co. LTD Read

The electrode material is the key to determine the performance of the lithium ion battery. As for negative electrode materials, graphite is widely used at present. However, it has many problems such as low capacity and poor safety. It has become more and more difficult to meet the needs of terminals. Therefore, the development of anode materials with high capacity, good safety performance is the inevitable trend of further development of lithium battery industry.

In order to promote the development of anode materials for lithium ion batteries, Tianjin Champlain Energy Technology Co Ltd (Tianjin Champlain Nano Technology Co., a wholly owned subsidiary of the company) with its own in nano materials and graphene in the field of expertise, based on the previous relevant technology and a large number of studies, after coated with graphene long life, fast charging and discharging lithium titanate cathode material production, recently successfully launched another market needs high capacity silicon based anode materials for the first generation high capacity silicon carbon anode -SiG400. The material has the advantages of high specific capacity, good stability and large compaction density. It can significantly improve the energy density and safety performance of lithium ion batteries. For example, silicon carbon negative battery can prolong the standby time of smart phones by more than 30%. The following are two typical test charts for SiG400.

As we all know, silicon based material has ten times more specific capacity than graphite, but its volume changes greatly during charging and discharging process, and it continues to interact with electrolyte. Therefore, the life of lithium ion battery is shortened, which hinders the large-scale application of silicon based materials. Although all the major materials manufacturers and battery manufacturers have listed silicon based anode materials as one of the key research points, there have been few successful commercial applications for many years.

SiG400's excellent sexual energy is based on the technology of silicon nano and graphene coating with independent intellectual property. The application of silicon nanotechnology can slow down the volume change during the charge and discharge process and shorten the distance of lithium ion transmission, while graphene coating gives full play to the conductive and thermal conductivity of graphene, excellent mechanical properties and stable electrochemical performance. The comprehensive application of these advanced technologies greatly improves the performance of silicon based materials.

1) the lithium ion diffusion and electrical conductivity of the material are improved, and the power characteristics are greatly improved.

2) isolating the direct contact between silicon and electrolyte, inhibiting the electrolyte decomposition and material erosion caused by side reactions, improving the first efficiency and delaying the life attenuation during use.

3) it greatly slows the volume change of silicon in the process of charging and discharging, maintains the overall stability of the material structure, and greatly improves the cycle characteristics.

The lithium ion battery with SiG400 as the negative pole has excellent performance in terms of power performance, cycle life and temperature adaptability besides its advantages such as high energy density and good safety performance. Champlain currently has a production capacity of the material, can realize large-scale production, and has been with the domestic well-known lithium battery manufacturers signed a strategic cooperation agreement to jointly develop a new generation of high energy density of lithium ion batteries, thus changing consumer electronics, new energy vehicles and energy storage areas such as battery energy density is limited by the situation to promote the rapid and healthy development of the industry.