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
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)。
