Easily Obtaining Excellent Performance High-voltage LiCoO 2 via Pr 6 O 11 Modification

Energy & Environmental Materials

article

Yongcong Huang¹  Chenjie Xu¹  Jingguo Gao¹  Liao Shen¹  Qian Liu¹  Guiying Zhao¹  Qingshui Xie⁴  Yingbin Lin¹  Jiaxin Li¹  Zhigao Huang¹ 

[1] College of Physics and Energy, Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research Center, Fujian Normal University;Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials;Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering;State Key Laboratory for Physical Chemistry of Solid Surfaces, Fujian Key Laboratory of Materials Genome, Collaborative Innovation Center of Chemistry for Energy Materials, College of Materials, Xiamen University

关键词: high-voltage LiCoO2;    pouch cell;    Pr6O11 modification;    simple mass-production;    thermal safety;   

DOI  :  10.1002/eem2.12311

来源: Wiley

【 摘 要 】

Developing an effective method to synthesize high-performance high-voltage LiCoO2 is essential for its industrialization in lithium batteries (LIBs). This work proposes a simple mass-produced strategy for the first time, that is, negative temperature coefficient thermosensitive Pr6O11 nanoparticles are uniformly modified on LiCoO2 to prepare LiCoO2@Pr6O11 (LCO@PrO) via a liquid-phase mixing combined with annealing method. Tested at 274 mA g−1, the modified LCO@PrO electrodes deliver excellent 4.5 V high-voltage cycling performance with capacity retention ratios of 90.8% and 80.5% at 25 and 60 °C, being much larger than those of 22.8% and 63.2% for bare LCO electrodes. Several effective strategies were used to clearly unveil the performance enhancement mechanism induced by Pr6O11 modification. It is discovered that Pr6O11 can improve interface compatibility, exhibit improved conductivity at elevated temperature, thus enhance the Li+ diffusion kinetics, and suppress the phase transformation of LCO and its resulting mechanical stresses. The 450 mAh LCO@PrO‖graphite pouch cells show excellent LIB performance and improved thermal safety characteristics. Importantly, the energy density of such pouch cell was increased even by ~42% at 5 C. This extremely convenient technology is feasible for producing high-energy density LIBs with negligible cost increase, undoubtedly providing important academic inspiration for industrialization.

【 授权许可】

Unknown