中国科学院青岛生物能源与过程研究所崔光磊团队首次报道了解决阴极/电解质界面电解液化学降解挑战的仿生抗老化粘合剂添加剂。相关研究成果发表在2021年10月13日出版的国际知名学术期刊《美国化学会杂志》。

对于层状过渡金属氧化物正极锂电池，电解液的化学降解会导致电池容量的快速衰减，严重影响其实际应用。电解液的这种化学降解是由活性氧（如单线态氧）的氧化和循环过程中自由基的攻击引起的。

为了解决该问题，研究人员首次报道了一种受生物启发的抗老化策略，即开发具有单线态氧和自由基清除能力的光稳定剂作为阴极粘合剂添加剂。结果充分证明，由粘合剂添加剂和市售聚偏二氟乙烯组成的粘合剂系统能够清除高压循环过程中产生的单线态氧和自由基，从而显著抑制电解质分解。因此，即使在高温下，也可以实现具有可再生优异电化学性能的基于过渡金属氧化物的高压层状锂电池。

该清除活性氧和自由基的仿生策略预示着一种新的模式，用于操纵各种可充电电池的阴极/电解质相间化学，包括层状过渡金属氧化物基阴极。

附：英文原文

Title: Bioinspired Antiaging Binder Additive Addressing the Challenge of Chemical Degradation of Electrolyte at Cathode/Electrolyte Interphase

Author: Pengzhou Mu, Huanrui Zhang, Hongzhu Jiang, Tiantian Dong, Shu Zhang, Chen Wang, Jiedong Li, Yue Ma, Shanmu Dong, Guanglei Cui

Issue&Volume: October 13, 2021

Abstract: For layered transition metal oxides cathode-based lithium batteries, the chemical degradation of electrolytes leads to fast battery capacity decay, severely challenging their practical applications. This kind of chemical degradation of electrolytes is caused by the oxidation of reactive oxygen (e.g., singlet oxygen) and the attack of free radicals during cycling. To address this, we first report a biologically inspired antiaging strategy of developing the photostabilizer with singlet oxygen- and free radicals-scavenging abilities as a cathode binder additive. It is fully evidenced that this binder system consisting of the binder additive and a commercially available polyvinylidene difluoride can scavenge singlet oxygen and free radicals generated during high-voltage cycling, thus significantly restraining electrolyte decomposition. As a result, high-voltage layered transition metal oxides-based lithium batteries with reproducibly superior electrochemical performance, even under elevated temperatures, can be achieved. This bioinspired strategy to scavenge reactive oxygen and free radicals heralds a new paradigm for manipulating the cathode/electrolyte interphase chemistry of various rechargeable batteries involving layered transition metal oxides-based cathodes.

DOI: 10.1021/jacs.1c06003

Source: https://pubs.acs.org/doi/10.1021/jacs.1c06003