清华大学发表最新Nature论文

Core Viewpoint - The research presents a novel strategy for developing high energy density and high safety solid-state lithium batteries by utilizing a "rich anion solvation structure" in polymer electrolytes, achieving an energy density of 604 Wh·kg⁻¹ [3][5]. Group 1: Research Findings - The research team developed an integrated fluorinated polyether electrolyte that combines strong solvating polyether segments with weakly solvating fluorinated hydrocarbon side chains, creating a "rich anion solvation structure" [4]. - This electrolyte enhances the redox reversibility of the LRMO cathode and significantly reduces side reactions at the oxygen interface, leading to improved performance [4]. - The quasi-solid polymer electrolyte, with 30wt% of trimethyl phosphate, achieved a reversible high surface capacity of over 8 mAh·cm⁻² in pouch cells and demonstrated over 500 cycles of long-term stability at 25°C in button cells [4]. Group 2: Comparative Analysis - The pouch battery reached an energy density of 604 Wh·kg⁻¹, which is significantly higher than the current commercial lithium iron phosphate energy density of approximately 150-190 Wh·kg⁻¹ and nickel-cobalt-manganese energy density of about 240-320 Wh·kg⁻¹ [4]. - The developed battery exhibited excellent safety performance during puncture and thermal tests at 120°C, with no incidents of combustion or explosion [4].