Cathode materials:Lithium iron phosphate, PVDF, conductive carbon black, NMP (solvent). Anode material: general graphite, PVDF, conductive carbon black, NMP (solvent).
Main characteristics:
In the crystal structure of LiFePO4, the Oxygen The atoms are arranged in a tight hexagonal arrangement. The PO43 tetrahedron and the FeO6 octahedron form the spatial skeleton of the crystal. Li and Fe occupy the octahedral voids, while P occupies the tetrahedral voids, Fe occupies the corner-sharing positions of the octahedron, and Li occupies the edge-sharing positions of the octahedron. octahedron.
What are the materials of the positive and negative electrodes of lithium-ion batteries?
The ingredients of the positive and negative electrodes of lithium batteries used in solar street lights include mainly the elementsfollowing materials.
Cathode ingredients:
1. Cathode Active Materials: Commonly used cathode active materials include lithium manganate (LiMn2O4), lithium cobalt oxide (LiCoO2), and lithium iron phosphate (LiFePO4). Among them, lithium iron phosphate is currently the most widely used cathode material because of its high safety, good service life and high energy density.
2. Binders: Commonly used binders include polymers, such as polyacrylate (PAA) and polyvinyl ester (PEA). The function of the binder is to bind the positive active material and the conductive agent together to form a solid positive structure.
3. Conductive agent: Commonly used conductive agents include carbon black and conductive polymers. The function of the conductive agent is to improve the conductive performance of the positive electrode andto promote the conduction of electrons.
Anode ingredients:
1. Negative active material: The commonly used negative active material is graphite. Graphite has good service life and high energy density, and is currently the most widely used anode material.
2. Binder: Polymer is also used as a binder to bind the negative active material and the conductive agent together.
3. Conductive agent: Commonly used conductive agents include carbon black and conductive polymers. The function of the conductive agent is to improve the conductive performance of the negative electrode and promote the conduction of electrons.
In addition to the above ingredients, lithium batteries also include an electrolyte and a separator. The electrolyte generally consists of lithium salts and organic solvents to ensure the transport of lithium ions. The separator is usedto insulate the positive and negative electrodes to avoid short circuits.
In short, the ingredients of positive electrodes of lithium batteries used in solar street lights mainly include positive active materials, binders and conductive agents, and the ingredients of negative electrodes mainly include negative active materials , binders and conductive agents. The selection and combination of these ingredients can be tailored to specific application needs and performance requirements.
Is this a lithium-ion battery? The negative electrode material of lithium batteries is lithium metal.
The anode materials of lithium-ion batteries on the market are mainly carbon materials, all kinds of carbon. The specific content is as follows:
The main negative electrode materials for lithium-ion batteries that have beenTee researched and developed include: graphite, stone tar, carbon fiber, pyrolytic carbon, carbon black, glassy carbon, etc. Among them, graphite and oil have the greatest application value.
The lithium insertion characteristics of graphite-type carbon materials are: ① The lithium insertion potential is low and flat, which can provide high and stable working voltage for lithium batteries -ion; ② The insertion capacity of lithium is high; , and the theoretical capacity of LiC6 is 372 mAh?g-1③ has poor compatibility with organic solvents and is prone to solvent co-insertion, reducing the insertion performance of lithium.
The characteristics of insertion and delithiation of tar and carbon materials are: ① The initial insertion potential of lithium is high, and the potential curve is asymmetric. Insertion of lithiumgenerally starts below 1.1V, and there is no obvious potential platform during the whole lithium insertion process; ② In the composition of the intercalation compound LixC6, x=0.5, the lithium insertion capacity is related to the heat treatment temperature and surface condition; ; ③ Compatible with solvents Good sexual and circulatory performance.
Physical properties of carbon anode materials
Carbon materials natural graphite artificial graphite petroleum coke pitch coke pyrolytic carbon acetylene ink
Heat treatment 2800 2500 2200 1900 1400 1200< /p>
Temperature∕℃
Crystallinity 229.1 112.1 84.5 3.9 2.5 1.2 1.2
Lc∕nm 47.4 19.3
Lattice constant 0.335 1.336 0.337 0.346 0.347 0.380 0.348
d∕nm 0.339 0.343
Density 2.20 1 .98 2.00 2.13 2.02 1.60 1.31
g?cm-3 1.95 1.97
Specific surface area 6.3 1.5 1.9 9.5 4.3 4.0 31.7
cm2?g-1 2.8 4.0