What are the characteristics of anode materials for lithium-ion batteries?

The negative electrode of lithium-ion battery is made of carbon or non-carbon material, binder and additives, which are homogeneously applied to both sides of copper foil, dried and rolled. The key to the success of lithium-ion batteries is the preparation of anode materials that can reversibly remove/embed lithium ions.

What are the types of anode materials?

▼Carbon Anode Materials

In practical applications, the carbon cathode materials for lithium-ion batteries are basically these carbon materials: artificial graphite, natural graphite, petroleum coke and carbon fiber.

▼Tin-based Anode Materials

Tin-based negative electrode materials can be divided into two general environments, one is the tin oxide, and the other is the tin-based composite oxide. Tin oxides are generally oxides of tin metal in various valence states.

▼Lithium-containing Transition Metal Nitride Anode Material

This kind of negative electrode material is still in the research stage, and there is no lithium-ion battery products that are traded with it as the negative electrode material.

▼Alloy-based Anode Materials

There are many types of alloy anode materials for lithium-ion batteries, including tin-based alloys, silicon-based alloys, aluminum-based alloys and other vast examples of alloys, but the alloy anode materials have not yet formed a large volume of limited production, and are still under further development.

▼Nano-level Anode Materials

Nanoscale negative electrode materials can add more minute other materials to the traditional negative electrode materials, which can greatly improve the charge/discharge capacity and charge/discharge times of lithium-ion batteries.

The selection of anode materials selection principles

• High energy ratio: the electrode potential of the lithium electrode should be lower;
• Good reversibility: good reversibility of charge and discharge reactions;
• Good compatibility: good compatibility with electrolyte and binder;
• Small external surface area: preferably less than 10m2/g,
• High true density: greater than 2.0g/cm3;
• Good invariance: good dimensional and mechanical invariance in the process of lithium inlay.

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