Lithium ion battery anode material :(1)
Carbon Materials of lithium ion battery
: graphitized carbon materials and amorphous carbon materials.
Such as graphite, soft carbon and mesophase carbon microspheres have been developed and researched in China, and various carbon materials such as hard carbon, carbon nanotubes and Bucky Ball C60 are being studied. (2)
Other materials of lithium ion battery: nitride, silicon-based materials, tin-based materials, new alloys, Nano oxides, etc. Negative electrode material: graphite is mostly used.
New research has found that titanate may be a better material.
Negative electrode reaction: lithium ion insertion during discharge and lithium ion insertion during charging. When charging: xLi xe6C-
When LixC6 discharges: LixC6 → xLi xe 6C are generally divided into the following types: The first is carbon negative electrode material: graphitized carbon material and amorphous carbon material.
Such as graphite, soft carbon and mesophase carbon microspheres have been developed and researched in China, and various carbon materials such as hard carbon, carbon nanotubes and Bucky Ball C60 are being studied.
The actual anode materials used in lithium ion batteries are basically 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 material: tin-based negative electrode material can be divided into tin oxide and tin-based composite oxide.
Oxides refer to oxides of various valence metal tin. There are no commercial products.
The third is lithium-containing transition metal nitride anode material, which has no commercial products.
The fourth is alloy negative electrode materials: including tin-based alloy, silicon-based alloy, Chu-based alloy, aluminum-based alloy, ladder-based alloy, magnesium-based alloy and other alloys, without commercial products.
The fifth is nano-scale negative electrode materials: carbon nanotubes and nano-alloy materials.
The sixth kind of nano-materials is nano-oxide materials: at present, Hefei Xiangzheng Chemical Technology Co. , Ltd. According to the latest Market Development Trend of lithium battery new energy industry in 2009, many companies have begun to use nano-titanium oxide and nano-silicon oxide to add them to traditional graphite, tin oxide and nano-carbon tubes, greatly improving the charging and discharging power and charging and discharging times of lithium batteries.
Several concepts related to negative electrode materials of lithium ion batteries electrochemical capacity: the amount of electricity charged or discharged to the maximum by the active substance per unit mass, generally expressed in mAh/g.
Irreversible capacity loss: during the charging and discharging process, the charging and discharging efficiency of the electrode is lower than 100%, and the electrochemical capacity of the discharge is lower than the charging, and the lost part is called irreversible capacity loss.
Electrode potential: the electrode potential of the ideal negative electrode material should be close to that of metallic lithium, which does not change much with the embedding amount of lithium. The electrode potential of graphite is 0. 4V to 0.
The change between 0V is a more suitable negative electrode material.
Charge and discharge rate: the charge and discharge speed of the reaction battery.
Circulability: the ability of the electrode material to maintain electrochemical capacity during repeated charge and discharge.
The cycle property of battery is related to the structural stability, chemical stability and thermal stability of electrode materials.
There are problems with negative electrode materials for lithium ion batteries (1)
Voltage lag, I . e. lithium embedding reaction is 0 ~ 0. Between 25V (Relative to Li/Li)The deintercalation reaction occurs at about 1 V; (2)In theory, it needs to be further deepened.
This depends on the preparation of various high purity and structured raw materials and carbon materials and the establishment of more effective structural characterization methods.
Development direction of cathode materials for lithium ion batteries (1)Smaller nano-scale lithium intercalation microstructure. (2)
Preparation of high purity and regular microstructure carbon anode materials.
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