This technology designs a 3D network binder by cross-linking polymers grafted with catecholamine and aminophenylboronic acid via boronic ester bonds to suppress the volume expansion of silicon anodes. The dynamic reversible nature of boronic ester bonds provides self-healing capabilities, while residual catecholamine enhances mechanical strength through superior adhesion.
Silicon (Si) anodes undergo rapid volume changes of up to 400% during charge and discharge cycles, leading to cracks and structural collapse within the electrode. This disrupts lithium-ion and electron transport pathways, causes unstable SEI layer formation, and triggers repeated side reactions with the electrolyte, resulting in capacity loss and rapid degradation of battery life.
This technology utilizes a copolymer binder created by grafting dopamine (catecholamine) and aminophenylboronic acid onto carboxylate-containing polymers, which are then cross-linked via boronic ester bonds. The binder forms a 3D network within the electrode to mechanically suppress volume expansion. Its reversible bonds repair damaged electrode structures, while dopamine groups improve adhesion to the current collector and active materials. Suitable for next-generation EV cells and smartphone batteries using high-capacity silicon or silicon-graphite composite anodes, it minimizes capacity loss from electrode delamination and cracking while allowing for higher silicon content.
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