Forums > General Discussion > What are the common Lithium-ion battery anode materials?
| What are the common Lithium-ion battery anode materials? | |
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| Posted: 18 Jul 2022 03:28 UTC | Post #1 |
| winshinepower Deck & Engine |
Registered Total Posts: 8 |
| 1 Lithium-ion battery anode material graphite Graphite has a wide range of sources and low price and is an early carbon material used as a negative electrode for lithium-ion batteries. There are two main types of graphite: natural graphite and artificial graphite. The reversible charge-discharge capacity of graphite, a lithium-ion battery material, can reach more than 350 mA h/g, which is close to the theoretical specific capacity of LiC6, which is 372 mA h/g. For Li/Li+), it has a good charge-discharge platform and stable voltage. However, due to the high crystallinity of lithium-ion battery material graphite and its highly oriented layered structure, it is sensitive to electrolytes and has poor compatibility with solvents. In addition, the lithium-ion battery material graphite has poor high-current charge and discharge capabilities. At the same time, since the graphite interlayer spacing of lithium-ion battery materials is smaller than that of the graphite interlayer compound LixC6 formed after lithium is inserted into the graphite layer, the graphite interlayer spacing changes greatly during the charge-discharge cycle; The co-insertion of the solvent between the graphite layers and the decomposition of the organic solvent can easily cause the graphite layer to gradually peel off, and the graphite particles to crack and pulverize, thereby reducing the cycle life of the graphite material for lithium-ion batteries. 2 Lithium-ion battery anode material coke Coke has the advantages of abundant resources and low prices. Lithium-ion battery materials are a class of carbon materials formed by liquid-phase carbonization. Depending on the raw materials, they can be divided into pitch coke and petroleum coke. Coke has strong adaptability to various electrolytes, better resistance to overcharge and over-discharge, and longer cycle life. Li-ion battery material coke has the characteristics of low heat treatment temperature, low cost, and good compatibility with PC, so it can reduce battery cost. However, since the voltage of the lithium-ion battery material is not stable during charging and discharging, and the average discharge voltage is relatively high, this is unfavorable for the practical voltage and capacity of the battery. In addition, the tap density of coke, a lithium-ion battery material, is about 80% that of graphite, so the volumetric specific capacity is lower. Lithium-io n Battery 3 Lithium-ion battery anode material hard carbon Hard carbon is a carbon material close to an amorphous structure, and generally has a high reversible lithium intercalation capacity, but the disadvantage is that the voltage lags significantly, that is, lithium ions are intercalated at around 0V (vs. Li+/Li) during charging while discharging. It is deintercalated at 1V, so the working voltage in the full battery system is only 3V. In addition, the cycle performance of hard carbon, a negative material for lithium-ion batteries, is poor, and its energy density is not as good as that of graphite. Considering the comprehensive performance, it is still unable to replace graphite materials, which makes it difficult to apply hard carbon to commercial lithium-ion batteries. 4 Mesophase carbon microspheres as anode materials for lithium-ion batteries Mesocarbo n microspheres (MCMB) are the most studied soft carbon anode materials for lithium-ion batteries. Its particles are spherical, with a high packing density, a highly ordered layered structure, and a large volume of specific energy. Lithium-ion battery anode material MCMB has a small specific surface area, which can reduce the occurrence of electrode boundary side reactions during the charging and discharging process, thereby reducing the capacity loss during the first charging process. In addition, the negative electrode material MCMB of lithium-ion battery has a lamellar structure, which is conducive to the insertion and extraction of lithium ions from all directions of the ball and solves the problem of graphite sheet swelling, collapse, and The problem of not being able to discharge large currents. The commercialized negative electrode material MCMB for lithium-ion batteries has excellent cyclability and is one of the main negative electrode materials currently used in long-life small lithium-ion batteries and power batteries. Its main problem is that its mass-specific capacity is not high (<300mA·h/g), especially when mesophase pitch carbon microspheres are used as electrode materials for lithium-ion batteries, graphitization at 2800°C is required, which undoubtedly greatly Increased the cost of mesophase pitch carbon microspheres. Lithi um-ion battery:https://www. winshinepower.com/LF P-60V-30AH-Battery.h tml | |
| Posted: 13 Sep 2022 00:34 UTC | Post #2 |
| heravinluca Engine |
Registered Total Posts: 2 |
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| Posted: 14 Feb 2023 04:29 UTC | Post #3 |
| Retrojet Deck & Engine |
Registered Total Posts: 1 |
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