Ladderphane copolymers for high-temperature capacitive energy storage
Ladderphane copolymers for high-temperature capacitive energy storage
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DOI：
10.1038/s41586-022-05671-4
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发表时间：
2023-03-02
期刊：
影响因子：
64.8
通讯作者：
Wang, Qing
中科院分区：
文献类型：
--
作者：
Chen, Jie;Zhou, Yao;Wang, Qing
对于在高温（1-4）下的电容能量存储，需要介电聚合物将低导电性与高导热性集成。这些看似矛盾的性质的共存仍然是现有聚合物的持续挑战。在这里，我们描述了一类梯形共聚物表现出一个以上的数量级的电导率低于现有的聚合物在高电场和高温下。因此，梯形共聚物具有5.34 J cm（-3）的放电能量密度，在200 ℃下具有90%的充放电效率，优于现有的介电聚合物和复合材料。梯形共聚物通过p-p堆叠相互作用（5，6）自组装成高度有序的阵列，从而产生1.96 +/- 0.06 W m（-1）K-1的固有贯通平面热导率。共聚物膜的高导热性允许有效的焦耳热耗散，因此，在高温和高电场下具有优异的循环稳定性。该共聚物的击穿自愈能力的证明进一步表明了梯形结构用于在极端条件下操作的高能量密度聚合物电容器的前景。
For capacitive energy storage at elevated temperatures(1-4), dielectric polymers are required to integrate low electrical conduction with high thermal conductivity. The coexistence of these seemingly contradictory properties remains a persistent challenge for existing polymers. We describe here a class of ladderphane copolymers exhibiting more than one order of magnitude lower electrical conductivity than the existing polymers at high electric fields and elevated temperatures. Consequently, the ladderphane copolymer possesses a discharged energy density of 5.34 J cm(-3) with a charge-discharge efficiency of 90% at 200 degrees C, outperforming the existing dielectric polymers and composites. The ladderphane copolymers self-assemble into highly ordered arrays by p-p stacking interactions(5,6), thus giving rise to an intrinsic through-plane thermal conductivity of 1.96 +/- 0.06 W m(-1) K-1. The high thermal conductivity of the copolymer film permits efficient Joule heat dissipation and, accordingly, excellent cyclic stability at elevated temperatures and high electric fields. The demonstration of the breakdown self-healing ability of the copolymer further suggests the promise of the ladderphane structures for high-energy-density polymer capacitors operating under extreme conditions.