Dataset Information

Insights Into the Interfacial Degradation of High-Voltage All-Solid-State Lithium Batteries.

ABSTRACT: Poly(ethylene oxide) (PEO)-based solid polymer electrolyte (SPE) is considered as a promising solid-state electrolyte for all-solid-state lithium batteries (ASSLBs). Nevertheless, the poor interfacial stability with high-voltage cathode materials (e.g., LiCoO₂) restricts its application in high energy density solid-state batteries. Herein, high-voltage stable Li₃AlF₆ protective layer is coated on the surface of LiCoO₂ particle to improve the performance and investigate the failure mechanism of PEO-based ASSLBs. The phase transition unveils that chemical redox reaction occurs between the highly reactive LiCoO₂ surface and PEO-based SPE, resulting in structure collapse of LiCoO₂, hence the poor cycle performance of PEO-based ASSLBs with LiCoO₂ at charging voltage of 4.2 V vs Li/Li⁺. By sharp contrast, no obvious structure change can be found at the surface of Li₃AlF₆-coated LiCoO₂, and the original layered phase was well retained. When the charging voltage reaches up to 4.5 V vs Li/Li⁺, the intensive electrochemical decomposition of PEO-based SPE occurs, leading to the constant increase of cell impedance and directly causing the poor performance. This work not only provides important supplement to the failure mechanism of PEO-based batteries with LiCoO₂, but also presents a universal strategy to retain structure stability of cathode-electrolyte interface in high-voltage ASSLBs.

SUBMITTER: Li J

PROVIDER: S-EPMC9485319 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Insights Into the Interfacial Degradation of High-Voltage All-Solid-State Lithium Batteries.

Li Jiawen J Ji Yuchen Y Song Haoran H Chen Shiming S Ding Shouxiang S Zhang Bingkai B Yang Luyi L Song Yongli Y Pan Feng F

Nano-micro letters 20220919 1

Poly(ethylene oxide) (PEO)-based solid polymer electrolyte (SPE) is considered as a promising solid-state electrolyte for all-solid-state lithium batteries (ASSLBs). Nevertheless, the poor interfacial stability with high-voltage cathode materials (e.g., LiCoO2) restricts its application in high energy density solid-state batteries. Herein, high-voltage stable Li3AlF6 protective layer is coated on the surface of LiCoO2 particle to improve the performanc ...[more]

PMID: 36121521

Similar Datasets

Project description:Safety and high-voltage operation are key metrics for advanced, solid-state energy storage devices to power low- or zero-emission HEV or EV vehicles. In this study, we propose the modification of single-ion conducting polyelectrolytes by designing novel block copolymers, which combine one block responsible for high ionic conductivity and the second block for improved mechanical properties and outstanding electrochemical stability. To synthesize such block copolymers, the ring opening polymerization (ROP) of trimethylene carbonate (TMC) monomer by the RAFT-agent having a terminal hydroxyl group is used. It allows for the preparation of a poly(carbonate) macro-RAFT precursor that is subsequently applied in RAFT copolymerization of lithium 1-[3-(methacryloyloxy)propylsulfonyl]-1-(trifluoromethylsulfonyl)imide and poly(ethylene glycol) methyl ether methacrylate. The resulting single-ion conducting block copolymers show improved viscoelastic properties, good thermal stability (T onset up to 155 °C), sufficient ionic conductivity (up to 3.7 × 10-6 S cm-1 at 70 °C), and high lithium-ion transference number (0.91) to enable high power. Excellent plating/stripping ability with resistance to dendrite growth and outstanding electrochemical stability window (exceeding 4.8 V vs Li+/Li at 70 °C) are also achieved, along with enhanced compatibility with composite cathodes, both LiNiMnCoO2 - NMC and LiFePO4 - LFP, as well as the lithium metal anode. Lab-scale truly solid-state Li/LFP and Li/NMC lithium-metal cells assembled with the single-ion copolymer electrolyte demonstrate reversible and very stable cycling at 70 °C delivering high specific capacity (up to 145 and 118 mAh g-1, respectively, at a C/20 rate) and proper operation even at a higher current regime. Remarkably, the addition of a little amount of propylene carbonate (∼8 wt %) allows for stable, highly reversible cycling at a higher C-rate. These results represent an excellent achievement for a truly single-ion conducting solid-state polymer electrolyte, placing the obtained ionic block copolymers on top of polyelectrolytes with highest electrochemical stability and potentially enabling safe, practical Li-metal cells operating at high-voltage.

Dataset Information

Insights Into the Interfacial Degradation of High-Voltage All-Solid-State Lithium Batteries.

Publications

Insights Into the Interfacial Degradation of High-Voltage All-Solid-State Lithium Batteries.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets