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硅碳负极
来源: | 作者:probf2879 | 发布时间: 2018-05-26 | 3678 次浏览 | 分享到:
 
 






 

技术路线


Technical route

与传统纳米硅的制备工艺各不相同,汇龙使用热处理--液相包覆生产“蛋壳-蛋黄”结构硅碳材料的技术方案,是一种从前驱体生产开始就有着独特制备工艺的成熟技术,此项技术全球首创。我们利用云南丰富的特种硅矿的优势,原材料获取相对较易,与有硅烷分解法,纳米线合成法,水热合成法等工艺相比,无需复杂而成本高昂的工序,即可得到无需提纯,并具有优秀纳米特性的硅碳材料前驱体,为后续工艺的实现和品控奠定了坚实的基础。
Different from the conventional nanometer silicon preparation technology, the heat-treatment-liquid-phase coating technology adopted by YUNNAN ENERGY INVESTMENT HEOLO TECHNOLOGY CO., LTD. is a technical solution for producing the “eggshell-yolk” silicon carbide materials. The technology is the global first to have a unique preparation process from the production of precursors. We take advantages of Yunnan's abundant special silicon mines to acquire relatively easy raw materials. Compared with other processes such as silane decomposition, nanowire synthesis, and hydrothermal synthesis, it requires no complicated and costly purification process and has excellent nano-characteristic silicon-carbon material precursors, laying a solid foundation for the realization of subsequent processes and quality control.






物理特性

Physical Properties

 ①汇龙硅碳材料具有低成本、高克容量、长循环寿命、高一致性的优点。其“蛋壳-蛋黄”结构
的纳米硅碳材料,具有优秀的抗膨胀能力。(图一)
①HEOLO silicon carbon materials feature low cost, high gram volume, long cycle life, and high consistency.  Its "eggshell-yolk" nano-silicon-carbon material is excellent to resist swelling. (Fig. 1)


②纳米碳层形成致密坚固的保护壳,将纳米级的硅颗粒包裹在其中,形成纳米硅/碳复合结构,降低硅基材料膨胀率的同时,也解决了硅作为半导体低电导率的缺点。而我们的独特原材料制备的硅碳材料在微米级别的形貌又表现为片状层叠,这样的结构又使得材料易分散、易压实,在成品电池的制作中可以得到更好的容量发挥,同时还能降低制作难度,更容易控制成品质量。(图二)
② The nano-carbon layer forms a dense and strong protective shell, which encapsulates the nano-sized silicon particles to generate a nano-silicon-carbon composite structure, reducing the expansion rate of the silicon-based material and also solving the low conductivity of silicon as a semiconductor. The micro-scale morphology of silica-carbon materials prepared from our unique raw materials is characterized by laminar stacking. This structure also makes the materials easy to disperse and compact, which can ensure better capacity in the production of finished batteries while lowering the production difficulty and enhancing the quality 


电化学性能
Electrochemical performance
汇龙纯硅碳产品的比容量稳定达到1100-1200mAh/g(图三)
The specific capacity of HEOLO pure silicon carbon is stably up to 1100-1200mAh/g (Fig. 3).

  
   


环境参数


Environmental parameters


粒径分布 Grain size distribution
D50:1-2um
纯硅碳比容量(mAh/g) 
Pure moissanite specific capacity (mAh/g)
>1000 mAh/g 
电极膨胀率
Electrode expansivity
<20% 
比表面积
Specific surface area 
<4m2/g, 对应400mAh/g的复合负极材料 <4m2/g, corresponding to 400mAh/g anode composites
<8m2/g,对应450mAh/g的复合负极材料 <8m2/g, corresponding to 450mAh/g anode composites
<12m2/g, 对应500mAh/g的复合负极材料 <12m2/g, corresponding to 500mAh/g anode composites
比首次库伦效率
First Coulombic Efficiency
>88%, 对应400mAh/g的复合负极材料 >88m2/g, corresponding to 400mAh/g anode composites
>85%,对应450mAh/g的复合负极材料 >85m2/g, corresponding to 450mAh/g anode composites
>80%, 对应500mAh/g的复合负极材料 >80m2/g, corresponding to 500mAh/g anode composites



产品通过独特的制备工艺和制备方法,很大程度的降低了材料的物料成本和生产成本,产品成本远远低于目前
的行业水平。产品加工性能较好,产品已经完成在国内某一线电池厂测试,综合性能达到国内领先水平,成为该公司的潜在供应商。公司2018年产能逐渐释放,纯硅碳负极设计产能为1000吨/年,欢迎广大客户合作接洽,共同推进国内锂电池行业的快速发展。
Through a unique preparation process and method, the material cost and production cost have cut down to a large extent, making the product cost far lower than the current level of the industry. The product machining performance is good and the product has been tested in a first-rate domestic battery factory to reach the domestic leading level for overall performance. The factory has become a potential supplier of HEOLO. We are planning to release our capacity gradually in 2018. The design capacity of pure silicon carbon anodes is 1000 tons/year. 
Customers are welcome to work with us to promote the rapid development of the domestic lithium battery industry.