A modified natural polysaccharide (carboxymethylated gellan gum) is investigated as a water-soluble highperformance binder for silicon anodes in lithium-ion batteries to improve poor cycle life and fast capacity fade of silicon anodes due to dramatic volume expansion during lithiation/delithiation process. The numberof carboxyl and acetyl groups distributed homogeneously in the modified polysaccharide polymer chain can form strong hydrogen bonds with the surface of Si particle and copper current collector, thus effectively restricting the volume change of silicon and maintaining electronic integrity of Si electrodes during repeated charge/discharge cycles. As a result, Si anodes with carboxymethylated natural polysaccharide polymer present high capacity performance, excellent rate capability, and stable cycling.
Ceramic
electrolyte guarantees the commercial application of all-solid-state
lithium batteries (ASSLBs) for its high ionic conductivity and wide
voltage window. However, the large interfacial impedance between the
ceramic and polymeric electrolyte is still tough issue for all-solid-state
batteries. Here, a “self-sacrifice” interface established
by a flexible Li1.5Al0.5Ge1.5(PO4)3 (LAGP)/30% poly(propylene carbonate) (PPC) solid
composite electrolyte causes a performance enhancement of the LiFePO4/Li battery with a discharge specific capacity of 151 mA h
g–1 at 0.05 C and a retention of 92.3% for 100 cycles
at 55 °C without any liquid electrolyte, where the PPC-derived
layer swells the Li metal and infiltrates to develop the amorphous
state to reduce both interfacial and bulk resistance; while the LAGP
with good mechanical strength and the LiF layer provides stability
and resists the growth of Li dendrites, which guaranteed the long
cycle life and security of batteries. This study demonstrates the
complementary advantages of ceramic and polymer, which implies a feasible
way to achieve a well-wetted, soft, and stable contact of the electrolyte
and electrode to overcome the interface issues in ASSLBs.
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