Big spherulite structure and high crystallinity are the two main drawbacks of poly(butylene succinate) (PBS) and hinder its application. In this work, a new type of copolyester poly(butylene succinate-co-butylene acetylenedicarboxylate) (PBSAD) is synthesized. With the incorporation of acetylenedicarboxylate (AD) units into PBS chains, the crystallization temperature and crystallinity are depressed by excluding AD units to the amorphous region. In contrast, the primary nucleation capability is significantly strengthened, without changing the crystal modification or crystallization kinetics, leading to the recovery of total crystallization rate of PBSAD under the same supercooling condition. The existence of specific interaction among AD units is found to be crucial. Although it is too weak to contribute to the melt memory effect at elevated temperature, the interaction continuously strengthens as the temperature falls down, and the heterogeneous aggregation of AD units keeps growing. When the aggregating process reaches a certain extent, it will induce the formation of a significant amount of crystal nuclei. The unveiled nucleation mechanism helps to design PBS copolymer with good performance.

New high-voltage cathode materials have been gradually developed, and their discharge voltages can reach more than 5 V ( vs. Li+/Li), but there are very few electrolytes matched with this cathode. Here, we have designed a modi ed electrolyte containing both FEC and LiDFOB additives which has a high oxidation potential over 5.0V, which perfectly match for high voltage lithium-rich manganese-based cathode. When FEC and LiODFB were added to the basic electrolyte, at 25℃ and 40℃ lithium-rich manganese-based cathode has excellent cycling stability in the voltage range of 2.5-5V. The capacity retention rate of the LMR/Li battery after 200 cycles was 66.5% at 25°C, and 68.7% after 100 cycles at 40°C. The rst cycle discharge speci c capacity of each system exceeds 200 mAh/g. In contrast, the capacity retention rate of lithium-ion batteries using primary electrolyte is merely 53.6% and 67.6% after cycling at 25 °C and 40 °C. The high-temperature, high-voltage performance exhibited by this formulation is a perfect match for Li-rich manganese-based cathode materials. Highlights 1. Li-rich Mn-based, excellent performance at high voltage and temperature.2. FEC, high oxidation stability, inhibit the side reaction of the electrolyte.3. LiDFOB, promote a stable and low-resistance CEI lm at the interface. 4. FEC+LiDFOB, synergistic effect at high-voltage, improves high-voltage stability.

New high-voltage cathode materials have been gradually developed, and their discharge voltages can reach more than 5 V ( vs. Li+/Li), but there are very few electrolytes matched with this cathode. Here, we have designed a modified electrolyte containing both FEC and LiDFOB additives which has a high oxidation potential over 5.0V, which perfectly match for high voltage lithium-rich manganese-based cathode. When FEC and LiODFB were added to the basic electrolyte, at 25℃ and 40℃，lithium-rich manganese-based cathode has excellent cycling stability in the voltage range of 2.5-5V. The capacity retention rate of the LMR/Li battery after 200 cycles was 66.5% at 25°C, and 68.7% after 100 cycles at 40°C. The first cycle discharge specific capacity of each system exceeds 200 mAh/g. In contrast, the capacity retention rate of lithium-ion batteries using primary electrolyte is merely 53.6% and 67.6% after cycling at 25 °C and 40 °C. The high-temperature, high-voltage performance exhibited by this formulation is a perfect match for Li-rich manganese-based cathode materials.