Silicon anode

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Alloying reaction

An electrode mechanism in which lithium forms an alloy with the host, as it does with silicon, tin or aluminium. It stores far more lithium per atom than intercalation at the cost of volume changes of several hundred percent.

Graphite

Layered carbon, the negative active material of nearly all lithium-ion cells. Lithium intercalates between its layers up to LiC₆, a theoretical 372 mAh/g, at a potential about 0.1 V above lithium metal.

Particle cracking

Fracture of active-material particles from the volume change of repeated lithium insertion and removal. New surfaces consume electrolyte to form fresh SEI, and fragments that lose contact no longer store lithium.

Self-healing binder

A binder made of polymers with reversible bonds — hydrogen bonds, disulfide links or host–guest pairs — that re-form after the network tears. It targets silicon and other alloying anodes, whose particles swell by up to 300 % and crack ordinary binders; a 2013 study showed such a polymer keeping silicon microparticle electrodes cycling far longer.

Swelling

Growth in a cell’s thickness, reversibly as the electrodes expand on charge and irreversibly as gas and SEI accumulate. Packs allow for it with compression pads, and a sudden swell in service is a warning sign.

References & further reading

Technical references

1. Promise and reality of post-lithium-ion batteries with high energy densities

   Jang Wook Choi, Doron Aurbach · Nature Reviews Materials · 2016

   Technical reference · Post-lithium-ion materials and battery concepts, including practical cell-level limitations; historical 2016 perspective.

Further reading on this topic

These sources provide broader context; they are not presented as citations for every statement in this entry.

2. DOE Explains… Batteries

   U.S. Department of Energy

   Topic background · Introductory account of electrodes, electrolyte and conversion between chemical and electrical energy.

3. Current and future lithium-ion battery manufacturing

   Yangtao Liu, Ruihan Zhang, Jun Wang, Yan Wang · iScience · 2021

   Topic background · Electrode preparation, cell assembly, formation and manufacturing trade-offs.