Silicon Oxide Anode Composite with Mg Silicate Shell for Capacity Retention

The patent divides the sintering process into two distinct stages: a first sintering stage at a lower temperature (50-200°C below the eutectic temperature) to form initial bonds without aggregation, and a second sintering stage at higher temperature to achieve desired capacity retention. This segmented approach prevents particle aggregation while still achieving the required capacity retention, resolving the contradiction between improving reliability and preventing harmful aggregation.

The patent applies a preliminary low-temperature sintering treatment before the final high-temperature sintering. This preliminary action creates initial bonding between particles and prepares the structure for subsequent high-temperature treatment without causing aggregation, thereby enabling the material to achieve good capacity retention while avoiding the harmful effects of direct high-temperature sintering.

The two-stage sintering process segments the temperature profile to achieve both capacity retention and Li ion permeability. The first stage at moderate temperature creates sufficient bonding for structural stability, while the second stage at higher temperature enhances capacity retention without excessive aggregation that would block Li ion pathways, thus maintaining both reliability and manufacturing precision.

The patent changes the sintering parameters by introducing a controlled temperature sequence rather than a single high-temperature step. This parameter change allows the material to achieve the desired capacity retention while preserving Li ion permeability through the optimized thermal history that controls particle growth and aggregation.

The patent performs preliminary sintering treatments during the manufacturing process itself, rather than relying on repeated charging-discharging cycles after production. This preliminary action achieves the necessary structural consolidation and capacity retention during manufacturing, significantly reducing the time required for subsequent activation cycles and improving overall production efficiency.

The patent skips the time-consuming repeated charging-discharging cycles that conventional methods require by implementing effective sintering during the manufacturing process. This rushing through of the activation phase is achieved by pre-establishing the proper particle bonding and structure through controlled sintering, thereby reducing total production time while maintaining capacity retention.

The two-stage sintering process segments the thermal treatment to achieve the right balance: the first stage at moderate temperature maintains particle shape and Li ion permeability, while the second stage enhances capacity retention. This segmentation allows both requirements to be satisfied simultaneously by applying different thermal conditions at different stages.

The patent changes the sintering parameters through a controlled temperature sequence, starting at a temperature that preserves particle morphology and Li ion permeability, then increasing to a temperature that improves capacity retention. This parameter change strategy enables the material to achieve both good Li ion permeability and capacity retention by optimizing the thermal history.