Citation: Aoyu Huang, Jun Xu, Yu Huang, Gui Chu, Mao Wang, Lili Wang, Yongqi Sun, Zhen Jiang, Xiaobo Zhu. Tailoring Electrode-Electrolyte Interfaces via a Simple Slurry Additive for Stable High-Voltage Lithium-Ion Batteries[J]. Acta Physico-Chimica Sinica, ;2025, 41(4): 240800. doi: 10.3866/PKU.WHXB202408007 shu

Tailoring Electrode-Electrolyte Interfaces via a Simple Slurry Additive for Stable High-Voltage Lithium-Ion Batteries

Aoyu Huang ¹ ,
Jun Xu ¹ ,
Yu Huang ¹ ,
Gui Chu ¹ ,
Mao Wang ¹ ,
Lili Wang ^2,, ,
Yongqi Sun ³ ,
Zhen Jiang ⁴ ,
Xiaobo Zhu ^1,,

1.
College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, China
2.
Key Laboratory of Materials and Technologies for Advanced Batteries, LIB Technology Center of Anhui Province, Hefei University, Hefei 230601, China
3.
School of Metallurgy and Environment and National Center for International Cooperation of Clean Metallurgy, Central South University, Changsha 410083, China
4.
School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW, 2522 Australia

Corresponding author: Lili Wang, wangll@hfuu.edu.cn Xiaobo Zhu, xbzhu@csust.edu.cn
Received Date: 7 August 2024
Revised Date: 30 August 2024
Accepted Date: 30 August 2024

Fund Project: the National Natural Science Foundation of China 52202210Natural Science Foundation of Hunan Province 2024JJ5024the Key Projects for the Excellent Talent Foundation of Education Department of Anhui Province 2024JJ5024

5 Ⅴ-class LiNi_0.5Mn_1.5O₄ (LNMO) cathode material is emerging as a promising cobalt-free alternative to meet the growing demand for affordable, high-performance lithium-ion batteries (LIBs). However, LNMO faces significant electrochemical challenges, particularly interfacial instability with commercial electrolytes due to its high operating potentials. This instability leads to the dissolution of transition metals and consequently electrode crosstalk, which severely deteriorates electrochemical performance. Surface coating is extensively investigated to reduce interfacial side reactions for enhanced cycling stability. Traditional methods typically require multiple steps, including dispersion, mixing, drying, and calcination, which can be time-consuming and complex. Additionally, the resulting ceramic coatings are often rigid and unevenly distributed due to lattice mismatches, potentially leading to poor interfacial contact and increased resistance. In this study, tetraethyl orthosilicate (TEOS) is proposed as a streamlined slurry additive to in situ form an ethoxy-functional polysiloxane (EPS) film on the surface of LNMO particles during electrode preparation. Post-mortem X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma (ICP) analyses reveal the crucial role of the EPS film in addressing interfacial instability issues. First, the EPS film serves as an artificial cathode-electrolyte interface (CEI) with a robust Si―O―Si bonding network, which is less vulnerable under high potentials. Second, the remaining ethoxy-functional groups in EPS scavenge HF by forming stable Si―F bonds, thereby suppressing the detrimental transition metal dissolution and crosstalk. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) further confirm the stability of the EPS film and the enhanced structural stability of the modified LNMO. Galvanostatic intermittent titration technique (GITT) and electrochemical impedance spectroscopy (EIS) results demonstrate that EPS reduces the overall impedance and improves ion diffusion kinetics by forming stable electrode-electrolyte interfaces. As a result, compared to the baseline, the optimized LNMO cathode exhibits significantly improved cycling stability in both half cells (84.6% vs. 51.4% capacity retention after 1000 cycles) and full cells when paired with commercial graphite anodes (83.3% vs. 53.4% retention after 500 cycles). This strategy, further validated under elevated temperatures of 50 ℃ and in pouch-type cells, is expected to pave the way for the development of next-generation high-performance LIBs.
- LiNi_0.5Mn_1.5O₄,
- High voltage,
- Cathode-electrolyte interface,
- Slurry additive,
- Transition metal dissolution,
- Lithium-ion battery
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沈阳化工大学材料科学与工程学院沈阳 110142