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Preparation and properties of SnO 2 /nitrogen-doped foamed carbon as anode materials for lithium ion batteries
Ionics ( IF 2.8 ) Pub Date : 2020-07-09 , DOI: 10.1007/s11581-020-03678-3
Shenggao Wang , Danyang Liu , Jingjing Yang , Geming Wang , Quanrong Deng

The excellent lithium storage capacity of SnO2 makes it as a potential candidate for a new generation of lithium ion battery anodes. However, the large volume change (≥ 300%) produced during the deintercalation of lithium and the irreversible capacity generated by the conversion of SnO2 into Sn both inhibit the application of SnO2 on the negative electrode of lithium ion batteries. In order to solve these problems, SnO2 nanoparticles were grown in the vesicles or on the skeleton of the nitrogen-doped foamed carbon. Due to the high mechanical strength and elasticity of porous structure, the foamed carbon serves as a buffering agent and provides space for volume expansion generated during the process of deintercalation lithium, and thus promotes the cycle stability of electrode. Furthermore, the incorporation of N atoms increases the electrical conductivity and active sites of the foamed carbon, which further improves the electrochemical performance of the composites. Consequently, the obtained NC/SnO2 electrode has a specific high capacity exceeding 750 mAh/g after 100 cycles at a current density of 0.1 A/g. The specific capacity of the battery also reaches a high level (≥ 450 mAh/g) at high current charge and discharge(1.6 A/g).



中文翻译:

锂离子电池负极材料SnO 2 /氮掺杂泡沫碳的制备及性能

SnO 2出色的锂存储能力使其成为新一代锂离子电池负极的潜在候选者。然而,在锂的脱嵌期间产生的大的体积变化(≥300%)和由SnO 2转化为Sn产生的不可逆容量均抑制了SnO 2在锂离子电池的负极上的施加。为了解决这些问题,SnO 2纳米颗粒生长在氮掺杂泡沫碳的囊泡或骨架上。由于多孔结构的高机械强度和弹性,泡沫碳用作缓冲剂,并为在脱嵌锂过程中产生的体积膨胀提供了空间,从而提高了电极的循环稳定性。此外,N原子的引入增加了泡沫碳的电导率和活性部位,这进一步提高了复合材料的电化学性能。因此,获得的NC / SnO 2电极在电流密度为0.1 A / g的情况下经过100次循环后,其比容量高出750 mAh / g。在大电流充电和放电(1.6 A / g)时,电池的比容量也达到高水平(≥450 mAh / g)。

更新日期:2020-07-09
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