The negative electrode of the lithium-ion battery is composed of negative active material, carbon material or non-carbon material, adhesive and additives. The adhesive paste is evenly coated on both sides of the copper foil and then rolled up. after drying. The negative electrode material is the main element of lithium storage in lithium-ion batteries, which allows lithium ions to be intercalated and deintercalated during the charging and discharging process. From a technical point of view, the anode materials of lithium-ion batteries will have diversified characteristics in the future.
With the advancement of technology, the current anode materials of lithium-ion batteries have developed from a single artificial graphite to mainly natural graphite, mesocarbon microspheres and graphite artificial, soft carbon/hard carbon, without a variety of negatives. electrode materials such ashe shaped carbon, lithium titanate and silicon-carbon alloys coexist.
Anode material: Graphite is mainly used. New research suggests titanate may be a better material. Negative reaction: Lithium ions are integrated during charging and lithium ions are detached during discharging. When charging: xLi++xe-+6C→LixC6 When discharging: LixC6→xLi++xe-+6C
Lithium ion battery anode materials can be divided into six categories: carbon anode materials, alloy anode materials, tin-based anode materials, lithium-containing transition metal nitride anode materials, nanoscale materials and anode materials at the nanoscale.
The first is carbon anode material: the anode materials actually used in lithium-ion batteries are mainly carbon materials, such as artificial graphite,natural graphite, mesophase carbon microspheres, petroleum coke, carbon fiber, pyrolytic resin. carbon, etc.
The second is tin-based negative electrode materials: tin-based negative electrode materials can be divided into tin oxide and tin-based composite oxides. Oxides refer to oxides of metallic tin in various valence states. There are no commercial products.
The third type is a lithium-containing transition metal nitride cathode material, which has no commercial products.
The fourth category is alloy anode materials: including tin-based alloys, silicon-based alloys, germanium-based alloys, aluminum-based alloys , antimony-based alloys, magnesium-based alloys and other alloys. are not commercial products.
The fifth category concerns the materials ofanode at the nanoscale: carbon nanotubes and nanoalloy materials.
The sixth type of nanomaterial is nanooxide: according to the latest market development trend of lithium battery new energy industry in 2009, many companies have begun to add oxide materials nanometer to traditional graphite, tin oxide and carbon nanotubes. Titanium oxide and nano-silicon oxide significantly improve the charge and discharge capacity and the number of charge and discharge times of lithium batteries.
Lithium battery anode materials are generally divided into the following types:
The first is carbon anode material:
It was actually used in lithium The negative electrode materials of ion batteries are basically carbon materials, such as artificial graphite, natural graphite, mimesophase carbon spheres, petroleum coke, carbon fiber, pyrolytic resin carbon, etc.
The second type is tin-based negative electrode materials:
Tin-based negative electrode materials can be divided into two types: tin oxide and tin-based composite oxide. Oxides refer to oxides of metallic tin in various valence states. There are currently no commercial products.
The third type is lithium-containing transition metal nitride anode materials, which currently have no commercial products.
The fourth type is alloy anode materials:
Including tin-based alloys, silicon-based alloys, germanium-based alloys, aluminum-based alloys, antimony-based alloys, magnesium-based alloys and other alloys, currently also There are no products cocommercial.
The fifth type is nanoscale negative electrode materials: carbon nanotubes and nanoalloy materials.
The sixth type of nanomaterial is nanooxide: at present, Hefei Xiangzheng Chemical Technology Co., Ltd. According to the latest market development trends of lithium battery new energy industry in 2009, many companies began to use nanotitanium oxide and nanoscale oxide materials. Silicon oxide is added to traditional graphite, tin oxide and carbon nanotubes to significantly increase the charge and discharge capacity and the number of charge and discharge times of lithium batteries.