This work develops 2-Phenyl-1H-imidazole-1-sulfonate(PHIS)as a multi-functional electrolyte additive for H2O/HF scavenging and film formation to improve the high temperature performance of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_...This work develops 2-Phenyl-1H-imidazole-1-sulfonate(PHIS)as a multi-functional electrolyte additive for H2O/HF scavenging and film formation to improve the high temperature performance of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)/graphite batteries.After 450 cycles at room temperature(25℃),the discharge capacity retentions of batteries with blank and PHIS-containing electrolyte are 56.03%and 94.92%respectively.After 230 cycles at high temperatures(45℃),their values are 75.30%and 88.38%respectively.The enhanced electrochemical performance of the batteries with PHIS-containing electrolyte is supported by the spectroscopic characterization and theoretical calculations.It is demonstrated that this PHIS electrolyte additive can facilitate the construction of the electrode interface films,remove the H2O/HF in the electrolyte,and improve the electrochemical performance of the batteries.This work not only develops a sulfonate-based electrolyte but also can stimulate new ideas of functional additives to improve the battery performance.展开更多
从制备方法到形貌控制的角度着手,使用水热法制备性能稳定的LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)正极材料并对其电化学性能进行分析。采用草酸(H2C2O4)、碳酸氢铵(NH4HCO3)和尿素(CON2H4)作为沉淀剂和螯合剂,使用不同的Ni、Co、Mn过渡金属...从制备方法到形貌控制的角度着手,使用水热法制备性能稳定的LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)正极材料并对其电化学性能进行分析。采用草酸(H2C2O4)、碳酸氢铵(NH4HCO3)和尿素(CON2H4)作为沉淀剂和螯合剂,使用不同的Ni、Co、Mn过渡金属盐作为原材料,利用水热法制备出新颖的棒状形貌、球形形貌和椭球形形貌的LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)正极材料,并对正极材料进行电化学测试。结果表明,棒状形貌、球形形貌和椭球形形貌的正极材料都具有优异的循环性能,其中椭球状材料的电化学性能最好(当在充放电倍率为20 m A/g,电压范围在2.8~4.3 V时,首次放电比容量为175.04m Ah/g,最高放电比容量为188.78 m Ah/g,容量保持率为88.7%,在倍率为2000 m A/g时放电比容量达到115.47m Ah/g)。展开更多
Nickel-rich LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)is regarded as the promising cathode for lithium-ion batteries(LIBs).However,the challenges such as safety issues and poor cycling performance have seriously hindered...Nickel-rich LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)is regarded as the promising cathode for lithium-ion batteries(LIBs).However,the challenges such as safety issues and poor cycling performance have seriously hindered its commercial applications.In order to overcome these difficulties,there has been extensive research and development of electrolyte modifications for high-energy-density LIBs with Ni-rich cathodes.Herein,this review introduces the research progress based on solvent additives,salt type additives and other electrolytes for LIBs with NCM811cathode materials and discusses how they control the interface stability.In particular,some recommendations for further modification of enhancing electrolyte stability and improving NCM811 electrochemical properties are summarized and proposed,which put forward new design rules for the screening and customizing ideal electrolyte additives for high performance NCM811 cathode-based LIBs.展开更多
基金financially supported by the Scientific and Technological Plan Projects of Guangzhou City(202103040001)。
文摘This work develops 2-Phenyl-1H-imidazole-1-sulfonate(PHIS)as a multi-functional electrolyte additive for H2O/HF scavenging and film formation to improve the high temperature performance of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)/graphite batteries.After 450 cycles at room temperature(25℃),the discharge capacity retentions of batteries with blank and PHIS-containing electrolyte are 56.03%and 94.92%respectively.After 230 cycles at high temperatures(45℃),their values are 75.30%and 88.38%respectively.The enhanced electrochemical performance of the batteries with PHIS-containing electrolyte is supported by the spectroscopic characterization and theoretical calculations.It is demonstrated that this PHIS electrolyte additive can facilitate the construction of the electrode interface films,remove the H2O/HF in the electrolyte,and improve the electrochemical performance of the batteries.This work not only develops a sulfonate-based electrolyte but also can stimulate new ideas of functional additives to improve the battery performance.
文摘从制备方法到形貌控制的角度着手,使用水热法制备性能稳定的LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)正极材料并对其电化学性能进行分析。采用草酸(H2C2O4)、碳酸氢铵(NH4HCO3)和尿素(CON2H4)作为沉淀剂和螯合剂,使用不同的Ni、Co、Mn过渡金属盐作为原材料,利用水热法制备出新颖的棒状形貌、球形形貌和椭球形形貌的LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)正极材料,并对正极材料进行电化学测试。结果表明,棒状形貌、球形形貌和椭球形形貌的正极材料都具有优异的循环性能,其中椭球状材料的电化学性能最好(当在充放电倍率为20 m A/g,电压范围在2.8~4.3 V时,首次放电比容量为175.04m Ah/g,最高放电比容量为188.78 m Ah/g,容量保持率为88.7%,在倍率为2000 m A/g时放电比容量达到115.47m Ah/g)。
基金financially supported by the National Natural Science Foundation of China(Nos.51971090,U21A20311)。
文摘Nickel-rich LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)is regarded as the promising cathode for lithium-ion batteries(LIBs).However,the challenges such as safety issues and poor cycling performance have seriously hindered its commercial applications.In order to overcome these difficulties,there has been extensive research and development of electrolyte modifications for high-energy-density LIBs with Ni-rich cathodes.Herein,this review introduces the research progress based on solvent additives,salt type additives and other electrolytes for LIBs with NCM811cathode materials and discusses how they control the interface stability.In particular,some recommendations for further modification of enhancing electrolyte stability and improving NCM811 electrochemical properties are summarized and proposed,which put forward new design rules for the screening and customizing ideal electrolyte additives for high performance NCM811 cathode-based LIBs.
