Since graphene is an electrically and thermally conductive material, is it possible for thermally conductive dissipation paste to also be electrically insulating?

Yes, with the proper choices of material and proportion control of graphene; allow the graphene thermal dissipation paste to be both insulating and thermally conductive.

Is graphene supposed to have high thermal conductivity of 5300 W/mK, but why does many commercial graphene thermal dissipation inks claim that the thermal conductivity is 5 W/mK or even lower?

The thermal conductivity of 5300 W/mK is the theoretical value for single-layer and free standing graphene sheet. Once the graphene is attached on other substance, the energy/heat transportation amongst graphene would be dampened.
Additionally, the commercial graphene thermal dissipation inks comprise more than graphene powder. Resin, used as matrix and adhesive, is a low thermal conductivity material. Therefore, the overall efficiency would NOT reach the ideal thermal conductivity of 5300 W/mK.

How does graphene work in the cathode of lithium ion battery?

With a few graphene additives in cathode, the performance of lithium ion battery can be enhanced, especially for the high voltage battery. The graphene can cope with the polarization problems caused by the overtention during the operation. Therefore, coulombic efficiency and cycle life of the small size lithium battery in blue tooth ear phone, wearable device, or vehicle video recorder can be improved. Particularly, graphene makes the charge/discharge rate of the LFP battery increased and the performance at low temperature stabilized. It also makes the cycle life of the LCO and NCM batteries prolonged.

How does graphene work in the anode of lithium ion battery?

When graphene is used in silicon based anode, graphene can develop a conductive network to minimize the resistance. Meanwhile, graphene can cover the silicon particles. It not only increases the contact spots between electrolyte and silicon particles for maximizing the positive effect which the silicon can attribute to, but also avoids dramatic volume expansion to prolong the cycle life.

What are the problems that graphene may encounter for lithium ion battery commercialization?

The dispersion of graphene plays a key role in performance improvement. Poor dispersion does not make the battery resistance low. Additionally, the surplus of graphene in battery system will lessen the amount of active materials, causing the decrease in capacity.
To solve the problems, Enerage has been working on the dispersion to achieve homogeneous suspension and to maximize the compatibility with the current battery system. Afterwards, the battery performance can be greatly enhanced and minimize the cost by simply adding only a few graphene additives.