Application of expandable graphite in batteries

Update:03-04-2020
Summary:

Expandable graphite is widely used, one of which is use […]

Expandable graphite is widely used, one of which is used in batteries. Let's take a closer look at expandable graphite in battery use.

1.Application in mercury-free high-energy batteries

Expanded graphite can be used in mercury-free high-energy batteries-alkaline silver oxide high-energy batteries. The cathode material of this battery is AgO or Ag2O, but both AgO and Ag2O are weakly conductive materials. When it is used as a cathode, it must be added. Only a proper amount of conductive medium can make the cathode have suitable conductive properties. At present, it is commonly used to add 5% to 15% of earth-like graphite as a conductive medium in a silver oxide cathode material. If you use expanded graphite, compared with earthy graphite, the battery used is less conductive and the battery has higher pulse characteristics. The voltage can be increased by 15% to 30%. The root cause is the oxidation of expanded graphite. The interlinked bonds in the layered structure of the silver cathode make the graphite particles interconnect with each other and spread throughout the cathode, but there is no such layered structure in the silver oxide cathode containing earthy graphite.

2.Application in ordinary zinc-manganese batteries (dry batteries)

Ordinary zinc-manganese battery cells are mostly acetylene black used in Germany and the United States in this century. The production processes are many, strict, expensive, and the conductivity is not ideal. Using high-purity expanded graphite instead of acetylene black as the electrode, its open circuit voltage, short-circuit current, and load voltage are higher than those produced by acetylene black. At the same time, production conditions are improved, and production costs are reduced.

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