SnS2/N‐Doped Graphene as a Superior Stability Anode for Potassium‐Ion Batteries by Inhibiting “Shuttle Effect”,Batteries & Supercaps

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SnS2/N‐Doped Graphene as a Superior Stability Anode for Potassium‐Ion Batteries by Inhibiting “Shuttle Effect”
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2019-10-21 , DOI: 10.1002/batt.201900104
Chuanchao Sheng ₁ , Chaofei Zhang ₁ , Xiaoxiao Shen ₁ , Shulin Zhao ₁ , Lijun Fu ₁ , Yuping Wu ₁ , Jing Wang ₁ , Yuhui Chen ₁

Affiliation

Potassium‐ion batteries are promising supplements to lithium‐ion batteries considering the abundance of potassium. However, the high reactivity of metallic potassium and low capacity of graphite anode are great challenges. A high capacity anode material is desired. Herein, we synthesize a tin sulfide/N‐doped reduced graphene oxide composite (SnS₂/N‐rGO), in which tin sulfide nanoparticles are dispersed on the N‐doped graphene layer. It shows a high reversible capacity of 645.2 mAh g⁻¹ at 50 mA g⁻¹ and 402 mAh g⁻¹ at 1 A g⁻¹. In situ X‐ray powder diffraction of the discharge process is carried out. KSn forms as a final product and K₂S₅ forms as an important discharge intermediate. Nitrogen‐doping immobilizes the tin sulfide particles and inhibits the loss of polysulfide intermediate. Therefore, 97.3 % of discharge capacity remains after 100 cycles. This result sheds light on the rational design of anode materials with large volume change for potassium ion batteries.

中文翻译：

SnS2 / N掺杂的石墨烯通过抑制“穿梭效应”作为钾离子电池的优异稳定性阳极

考虑到钾的含量，钾离子电池有望成为锂离子电池的补充。然而，金属钾的高反应性和石墨阳极的低容量是巨大的挑战。需要高容量的阳极材料。本文中，我们合成了硫化锡/ N掺杂的还原氧化石墨烯复合材料（SnS ₂ / N-rGO），其中硫化锡纳米颗粒分散在N掺杂的石墨烯层上。它显示的645.2毫安g的高可逆容量^-1在50mA克^-1和402毫安克^-1 1个A G ^-1。进行放电过程的原位X射线粉末衍射。KSn形成最终产品，K ₂ S ₅形式作为重要的排放中间体。氮掺杂固定了硫化锡颗粒并抑制了多硫化物中间体的损失。因此，在100次循环后仍保留97.3％的放电容量。这一结果为钾离子电池负极材料大体积变化的合理设计提供了参考。

更新日期：2019-10-21

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