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Silicon-carbon composite, a method for preparing said composite, and an electrode material and a battery comprising said composite

A composite, silicon carbon technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low production efficiency and poor long-term cycle performance

Inactive Publication Date: 2017-08-29
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the complex is prepared through a series of production processes, resulting in low production efficiency
[0007] A common problem with the compounds of the above three prior art references is limited capacity retention at short cycle numbers, while their long-term cycle performance is poor

Method used

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  • Silicon-carbon composite, a method for preparing said composite, and an electrode material and a battery comprising said composite
  • Silicon-carbon composite, a method for preparing said composite, and an electrode material and a battery comprising said composite
  • Silicon-carbon composite, a method for preparing said composite, and an electrode material and a battery comprising said composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] First, 0.73 g of Si NPs (50–200 nm in size, Alfa-Aesar), 0.11 g of CNTs (10–20 nm in OD, 10–30 μm in length, Chengdu Organic Chemical Co., Ltd.) and 0.37 g of PF (Shandong Shengquan Shenquan Group ) was dispersed in 150mL absolute ethanol, stirred and ultrasonically treated for 1 hour. Second, the mixture was spray-dried (inlet temperature: 170 °C; outlet temperature: 100 °C) to form PF-wrapped Si NP and CNT (Si / CNT@PF) composite microparticles. Finally, the obtained Si / CNT@PF composite was heated in an argon atmosphere at 5 °C / min to 900 °C for 2 h, and PF was pyrolyzed into amorphous carbon. The resulting composite is Si / CNT@C. Since the residual carbon fraction of PF is 58%, the weight ratio of Si NP:CNT:C coating in the Si / CNT@C composite was calculated to be 69:10:21.

[0071] structural assessment :

[0072] figure 1 A schematic sketch of Si / CNT@C is shown. The structure of Si / CNT@C can be described as follows: micron-sized spheres consist of nanometer-size...

Embodiment 2

[0090] Example 2 was carried out similarly to Example 1, with the difference that the weight ratio of SiNP:CNT:C coating in the resulting Si / CNT@C composite was calculated to be 54:10:36.

[0091] Figure 9 Shown is (b) the cycle performance of Si / CNT@C of Example 2.

Embodiment 3

[0093] Example 3 is implemented similarly to Example 1, the difference is that copper ethyl acetoacetate (Cu salt) is additionally dispersed in absolute ethanol as a copper source, and the intermediate product of step 2) is Si NP+CNT wrapped by PF + Cu salt (Si / CNT / Cu salt@PF), the calculated weight ratio of Si NP:CNT:Cu:C coating in the resulting composite (Si / CNT / Cu@C) is 60:10:10 :20.

[0094] Figure 9 Shown is the cycle performance of Si / CNT / Cu@C of (c) embodiment 3; Figure 10 Shown are the SEM photos of (a) Si / CNT / Cu salt @PF and (b) Si / CNT / Cu@C of Example 3; Figure 11 Shown is (a) the XRD spectrum of Si / CNT / Cu@C of Example 3.

[0095] Depend on Figure 9 It can be seen that the cycle performance of the Si / CNT / Cu@C composite of Example 3 is further improved by adding copper.

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Abstract

The present invention relates to a silicon-carbon composite, which is present in a form of porous secondary particle and contains silicon nanoparticles, one or more conductive carbon additives, and a conductive carbon coating layer. The present invention further relates to a method for preparing said composite, and an electrode material and a battery comprising said composite.

Description

technical field [0001] The present invention relates to silicon-carbon composites in the form of porous secondary particles and comprising silicon nanoparticles, one or more conductive carbon additives and a conductive carbon coating. The invention also relates to methods for preparing said composites and electrode materials and batteries comprising said composites. Background technique [0002] There is a growing demand for next-generation lithium-ion batteries (LIBs) with high energy density and long cycle life for large-scale applications such as electric vehicles (EVs) and static utility grids. Silicon is an attractive anode material for lithium-ion batteries because of its theoretical capacity 10 times that of its carbon counterpart in the latest state-of-the-art. The major challenges associated with Si anodes are the structural degradation and solid-electrolyte interface (SEI) instability during cycling due to the large volume change (about 300%), leading to rapid cap...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M10/0525
CPCH01M4/134H01M4/1395H01M4/364H01M4/366H01M4/386H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 杨军于晶露别依田苗荣荣冯雪娇张敬君蒋蓉蓉窦玉倩
Owner ROBERT BOSCH GMBH
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