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首页> 外文期刊>International Journal of Electrochemical Science >Electrochemical Properties of Si Negative Electrodes Bonded with Partially Hydrolyzed Polyacrylamide for Li-ion Batteries
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Electrochemical Properties of Si Negative Electrodes Bonded with Partially Hydrolyzed Polyacrylamide for Li-ion Batteries

机译：锂离子电池部分水解聚丙烯酰胺结合的Si负极的电化学性能

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摘要

Si negative electrode bonded with partially hydrolyzed polyacrylamide (HPAM) was prepared, theperformance of the charge/discharge cycle of lithium-ion batteries was studied, and the surfacemorphologies of the electrodes after the charge/discharge cycle was observed using the SEM. Thecoulombic efficiency of the Si-based electrode increased from less than 30% of initial cycle to over90% after 50cycles. SEM indicated that the HPAM binder was a much more effective restraint onvolume expansion in active Si materials during the charging process. The discharge capacity of Si- HPAM electrodes was approximately 120% and 111% after 50 cycles, respectively, compared to thefirst cycle in the voltage range of 0.07-1.2V and 0.06-1.0V, which was attributed to the excellentmaintenance of an electrical-conducting network during cycling and inhibiting the powders pull-offfrom the surface of the electrodes effectively. Few active powders detached from the surface after thecharge/discharge test, as a result of the formation of the three dimensional network structure, whichwas benefit to the long service lifetime of the lithium-ion batteries.
机译：制备了部分水解聚丙烯酰胺（HPAM）粘结的Si负极，研究了锂离子电池的充放电循环性能，并用SEM观察了充放电循环后电极的表面形貌。硅基电极的库仑效率从初始循环的不到30％增加到50次循环后的90％以上。扫描电镜表明，在充电过程中，HPAM粘合剂是抑制活性硅材料体积膨胀的有效方法。在0.07-1.2V和0.06-1.0V的电压范围内，Si- HPAM电极在50个循环后的放电容量分别比第一个循环的放电容量分别约为120％和111％，这归因于其优异的电维护性能。循环过程中的导电网络，并有效抑制粉末从电极表面脱落。充放电试验后，由于形成了三维网络结构，很少有活性粉末从表面脱落，这有利于锂离子电池的长使用寿命。

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