Keywords: cathode material, lithium ion battery
Study on the performance of anthraquinone-based conjugated microporous polymers for lithium-ion battery cathode materials
Organic materials containing redox active groups have become a class of electrode materials for rechargeable batteries with great development potential due to their high redox activity, low cost, and diverse building units. However, the high solubility of organic small molecules and linear polymers in organic electrolytes usually leads to problems such as rapid decay of electrode material capacity with cycling.
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Conjugated microporous polymers
Conjugated microporous polymers have great application prospects in secondary battery electrode materials due to their cross-linked porous framework structure and highly conjugated macromolecular chains.
Using biphenyl with a conjugated structure and anthraquinone containing active elements (carbonyl) as building units, a high specific surface area (257 m2 g-1) and abundant active sites were synthesized through the classic Suzuki coupling reaction. Anthraquinone-based conjugated microporous polymer (PLPhAq) lithium ion battery cathode material.
At a current density of 50 mA·g-1, the PLPhAq positive electrode has a specific capacity of 164 mAh·g-1, and can still maintain a specific capacity of 126 mAh·g-1 after 800 cycles.
At 1000 mA·g-1, the specific capacity only decays from 97 to 74 mAh·g-1 after 5000 cycles at a current density of 5%.
This research shows that conjugated microporous polymer is a cathode electrode material for lithium-ion batteries with great development potential.
