用于锂离子电池高压LNMO正极的瓜尔胶-木聚糖粘结剂  

Guar Gum-Xylan Binder for High-Voltage LNMO Cathode of Lithium-ion Battery

作　　者：胡钰珺 慎洋 韦健伦 邓媛 杨斐婷 杨雅姿 苏静[1,2] HU Yu-jun;SHEN Yang;WEI Jian-lun;DENG Yuan;YANG Fei-ting;YANG Ya-zi;SU Jing(School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China;Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development,Nanning 530004,China)

机构地区：[1]广西大学化学化工学院,广西南宁530004 [2]广西高校应用化学技术与资源开发重点实验室,广西南宁530004

出　　处：《化学试剂》2024年第3期66-72,共7页Chemical Reagents

基　　金：广西壮族自治区大学生创新创业训练计划项目(S202310293309);广西自然科学基金项目(2021GXNSFAA220115);广西大学2023年本科专业核心竞争力提升计划(西大教学〔2023〕8号)。

摘　　要：具有尖晶石结构的镍锰酸锂(LNMO)被认为是最有前景的正极材料之一,然而高工作电压会严重影响LNMO正极的循环寿命,导致在充放电过程中容量快速衰减、循环性能较差。针对锂离子电池无钴正极材料镍锰酸锂(LNMO)在高电压下的界面不稳定的缺点,开发了适用于5.0 V高压LNMO正极的木聚糖-瓜尔胶复合粘结剂。研究结果表明,瓜尔胶与木聚糖通过交联形成酯基,使粘结剂具备良好的机械性能;与PVDF粘结剂相比,使用复合粘结剂的LNMO的循环稳定性得到了显著提高,是具有应用前景的锂离子电池高压正极粘结剂。Lithium nickel manganese oxide(LNMO)with spinel structure is considered to be one of the most promising cathode materials,but the high working voltage will seriously affect the cycle life of the LNMO cathode,resulting in rapid capacity decay and poor cycle performance during charging and discharging.In order to solve the shortcomings of the interface instability of LNMO,a cobalt-free cathode material for lithium-ion battery,at high voltage,a xylan-guar gum composite binder suitable for 5.0 V high-voltage LNMO cathode was developed.The results showed that the guar gum and xylan formed an ester group via crosslinking,which grafted the binder with good mechanical properties.Compared with PVDF binder,the cycle stability of LNMO with composite binder has been significantly improved,which is a promising binder for the high-voltage cathode of lithium-ion battery.

关 键 词：瓜尔胶 木聚糖 镍锰酸锂 锂离子电池 粘结剂 

分 类 号：O65[理学—分析化学]