Converting micro-sized kerf-loss silicon waste to high-performance hollow-structured silicon/carbon composite anodes for lithium-ion batteries,Sustainable Energy & Fuels

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Converting micro-sized kerf-loss silicon waste to high-performance hollow-structured silicon/carbon composite anodes for lithium-ion batteries
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-07-14 , DOI: 10.1039/d0se00831a
Qiang Ma _{1,

2,

3,

4,

5} , Jiakang Qu _{1,

2,

3,

4,

5} , Xiang Chen _{1,

2,

3,

4,

5} , Zhuqing Zhao _{1,

2,

3,

4,

5} , Yan Zhao _{1,

2,

3,

4,

5} , Haijia Zhao _{1,

2,

3,

4,

5} , Hongwei Xie _{1,

2,

3,

4,

5} , Pengfei Xing _{1,

2,

3,

4,

5} , Huayi Yin _{1,

2,

3,

4,

5}

Affiliation

Low-cost feedstocks and rationally designed structures are the keys to determining the lithium-storage performance and practical applications of Si-based anodes for lithium-ion batteries (LIBs). Herein, we employ low-cost micro-sized kerf-loss silicon (KL-Si) as the cheap feedstock and melamine resin as the carbon source to prepare a hollow-structured Si@void@C composite. The naturally formed SiO_x film and the organic layer on the surface of KL-Si during the diamond wire slicing process serve as a natural sacrificial double template to create voids between the Si core and a melamine resin-derived carbon coating. The as-prepared hollow-structured Si@void@C composite anode delivers 1164.4 mA h g⁻¹ at 1 A g⁻¹ after 300 cycles with a retained capacity of 927 mA h g⁻¹ after 500 cycles at 3 A g⁻¹. The full cell with the prelithiated Si@void@C anode and a Li(Ni_0.6Co_0.2Mn_0.2)O₂ cathode boasts a high a capacity retention of 81.5% after 150 cycles. This paper presents a straightforward approach to converting low-cost KL-Si waste to value-added LIB anodes, enabling the full utilization of the Si feedstock in the photovoltaic industry.

中文翻译：

将微米级切缝损耗的硅废料转化为用于锂离子电池的高性能中空结构硅/碳复合阳极

低成本原料和合理设计的结构是确定锂存储性能和锂离子电池（LIB）硅基阳极实际应用的关键。在这里，我们采用廉价的微米级切缝损耗硅（KL-Si）作为便宜的原料，并使用三聚氰胺树脂作为碳源来制备中空结构的Si @ void @ C复合材料。金刚石线切割过程中，自然形成的SiO _x膜和KL-Si表面上的有机层用作自然牺牲双模板，从而在Si核与三聚氰胺树脂衍生的碳涂层之间形成空隙。所述制得的中空结构的Si @空隙@ C复合阳极提供1164.4毫安汞柱^-1 1 A G ^-1后300个循环的残留927毫安汞柱的容量^-1在图3A克500次循环后^-1。具有预锂化的Si @ void @ C阳极和Li（Ni _0.6 Co _0.2 Mn _0.2）O ₂阴极的完整电池在150个循环后具有81.5％的高容量保持率。本文提出了一种简单的方法，可以将低成本的KL-Si废物转化为增值的LIB阳极，从而在光伏行业中充分利用Si原料。

更新日期：2020-08-25

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