The layer-by-layer structure formed by the synergistic effect of GO and AgNWs endows the strain sensors with high sensitivity and a wide working range.
The
success of next-generation lithium-ion batteries (LIBs) fundamentally
depends on the rational design of not only the microstructure of an
individual component but the component assembling structures on the
electrode level. However, building advanced assembling structures
for especially high-capacity electrodes is an urgent but a challenging
task due to the lacking of in-depth understanding and effective strategies.
Here, we propose a functional nanocoating biobinder using the well-known
poly(lactic acid) to address the above need. It is found that the
composite electrodes with this nanocoating biobinder are upgraded
with uniform and robust assembling structures, including the electron-transportation
network, ion-transportation network, and interfaces. Importantly,
the nanocoating finally works as a new type of polymeric artificial
cathode electrolyte interphase (poly-CEI) to protect the active particles.
Therefore, a remarkable improvement in the electrochemical performance
has been achieved for high-capacity electrodes (LiFePO4, lithium nickel cobalt manganite (NCM), and lithium nickel cobalt
aluminum acid (NCA)). In particular, the LFP cathode can deliver a
high discharge capacity of 74.6 mA h g–1 at 10C
and a high capacity retention of 95.5% even after 850 cycles at 2C.
For NCA and NCM cathodes, the cycling stability is dramatically improved
due to the protection by the poly-CEI. In short, this study may reshape
the essential roles of a binder in composite electrodes by highlighting
its critical link to assembling structures.
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