Why do lithium batteries like to use graphite as anode materials?
What is a lithium-ion battery?
Lithium-ion battery refers to a secondary battery system in which two different lithium intercalation compounds capable of reversibly intercalating and deintercalating lithium ions are used as the positive and negative electrodes of the battery, respectively. During charging, lithium ions are deintercalated from the positive electrode, passing through the electrolyte and separator, and intercalating into the negative electrode; on the contrary, during discharging, lithium ions are deintercalating from the negative electrode, passing through the electrolyte and the separator, and intercalating into the positive electrode. The negative electrode of lithium ion battery is made of negative electrode active material, binder and additives to make paste glue, which is evenly spread on both sides of copper foil, dried and rolled.
What are the advantages of graphite as a negative electrode material?
Graphite is an allotrope of carbon, and the two are closely related. Graphite is the most stable form of carbon. (Diamond is a metastable allotrope of carbon. Although its hardness is much higher than that of graphite, it is the hardest substance in nature, but its stability is lower than that of graphite.)
In general, graphite has the advantages of high electronic conductivity, small volume change of layered structure before and after lithium intercalation, high lithium intercalation capacity, and low lithium intercalation potential, and has become the mainstream commercial lithium-ion battery negative electrode material.
What is the way to obtain graphite?
There are two ways to obtain graphite: one is natural ore, and the other is synthetic coal tar. The graphite material used in lithium-ion batteries is generally composed of 55% synthetic graphite and 45% low-purity natural graphite.
Manufacturers once favored synthetic graphite because of its uniformity and purity superior to natural graphite. Now it is different. The application of modern chemical purification methods makes it possible to obtain 99.9% pure natural graphite after heat treatment. In contrast, synthetic graphite is 99% pure, so the former is more popular.
Compared with synthetic graphite, purified natural flake graphite has higher crystallinity and better electrical and thermal conductivity. In addition, natural graphite is expected to reduce the production cost of lithium-ion batteries while achieving equal or better battery performance.
High quality graphite supplier
Luoyang Moon & Star New Energy Technology Co., LTD, founded on October 17, 2008, is a high-tech enterprise committed to the research and development, production, processing, sales and technical services of lithium ion battery anode materials. After more than 10 years of development, the company has gradually developed into a diversified product structure with natural graphite, artificial graphite, composite graphite, intermediate phase and other negative materials (silicon carbon materials, etc.). The products are widely used in high-end lithium ion digital, power and energy storage batteries.If you are looking for Lithium battery anode material,click on the needed products and send us an inquiry：sales@graphite-corp.com
