Reason analysis for Graphite-Si/SiOx/C composite anode cycle fading and cycle improvement with PI binder

Yuan, QingFeng; Zhao, Fenggang; Zhao, Yanming; Liang, Zhiyong; Yan, Danlin

doi:10.1007/s10008-014-2452-9

Cited by 24 publications

(9 citation statements)

References 25 publications

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“…The alloy electrode with aro-PI binder has good cycling characteristics for this coating formulation, and it is well known now that aro-PI is a good binder in alloy coatings. [3][4][5] However, the alloy electrode with aro-PI binder has high irreversible capacity, which is expected from the active aro-PI binder contribution. The alloy electrode with ali-PI binder has much lower first cycle capacity and irreversible capacity, which is consistent with the findings above that ali-PI is inactive, however the cycling performance of the alloy electrode with ali-PI binder is very poor.…”

Section: A369mentioning

confidence: 99%

“…[6][7][8] Polyimide binder demonstrates flexibility, good surface coverage and strong adhesion to current collectors. 5,7 The strong adhesion force between PI and current collectors or alloy particles arises from the carboxylic groups of the poly(amic acid) (PI precursor) interacting with metal surfaces. For example, poly(amic acid) reacts with copper to make copper carboxylate, which inhibits imidization so the interaction remains after curing.…”

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confidence: 99%

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The Electrochemical Behavior of Polyimide Binders in Li and Na Cells

Wilkes

Brown

Krause³

et al. 2015

J. Electrochem. Soc.

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The electrochemistry of aromatic and aliphatic polyimide binders was characterized in composite coatings for Li-ion and Na-ion battery negative electrodes. Aromatic polyimide was found to have a large first lithiation capacity of 1943 mAh/g and a reversible capacity of 874 mAh/g in lithium cells. The large first lithiation capacity is suggestive of its full reduction to carbon. Subsequent cycles of aromatic-PI are also similar to that of hydrogen containing carbons. Aromatic-PI is also active in Na cells, but with less capacity and less hysteresis during cycling, which is also consistent with the behavior of hydrogen containing carbon in Na cells. Therefore, we suspect that after the first lithiation or sodiation, all of the aromatic-PI becomes carbonized. These conductive reaction products lead to excellent cycling in alloy cells. In contrast, aliphatic-PI is inert and leads to poor cycling when used in alloy cells. These results may have large implications for the use of conductive polymer binders, which may just be carbonizing during their first lithiation.

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Section: A369mentioning

confidence: 99%

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confidence: 99%

The Electrochemical Behavior of Polyimide Binders in Li and Na Cells

Wilkes

Brown

Krause³

et al. 2015

J. Electrochem. Soc.

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“…Thus far, polyvinylidene fluoride (PVdF) has been widely utilized as a polymeric binder for commercialized LIBs over decades. Unfortunately, however, PVdF did not provide satisfactory cycling stability when applied to Si anodes due to its easy swelling property in electrolytes coupled with intrinsically low elasticity. ,− Recently, a number of studies have investigated the selection of appropriate polymeric binders, such as alginate, , poly(acrylic acid) (PAA), ,, carboxymethyl cellulose (CMC), polyamide-imide (PAI), and polyimide (PI) requiring thermal treatment at high temperature, − leading to dramatically enhanced electrochemical performance of Si anodes by changing only the kind of binder. Chemical structures of the typical polymeric binders are demonstrated in Figure .…”

Section: Introductionmentioning

confidence: 99%

Highly Adhesive and Soluble Copolyimide Binder: Improving the Long-Term Cycle Life of Silicon Anodes in Lithium-Ion Batteries

Choi

Kim

Jeong

et al. 2015

ACS Appl. Mater. Interfaces

108

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A highly adhesive and thermally stable copolyimide (P84) that is soluble in organic solvents is newly applied to silicon (Si) anodes for high energy density lithium-ion batteries. The Si anodes with the P84 binder deliver not only a little higher initial discharge capacity (2392 mAh g(-1)), but also fairly improved Coulombic efficiency (71.2%) compared with the Si anode using conventional polyvinylidene fluoride binder (2148 mAh g(-1) and 61.2%, respectively), even though P84 is reduced irreversibly during the first charging process. This reduction behavior of P84 was systematically confirmed by cyclic voltammetry and Fourier-transform infrared analysis in attenuated total reflection mode of the Si anodes at differently charged voltages. The Si anode with P84 also shows ultrastable long-term cycle performance of 1313 mAh g(-1) after 300 cycles at 1.2 A g(-1) and 25 °C. From the morphological analysis on the basis of scanning electron microscopy and optical images and of the electrode adhesion properties determined by surface and interfacial cutting analysis system and peel tests, it was found that the P84 binder functions well and maintains the mechanical integrity of Si anodes during hundreds of cycles. As a result, when the loading level of the Si anode is increased from 0.2 to 0.6 mg cm(-2), which is a commercially acceptable level, the Si anode could deliver 647 mAh g(-1) until the 300th cycle, which is still two times higher than the theoretical capacity of graphite at 372 mAh g(-1).

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“…For this, carbonization of BC can be applied to develop the electrode since carbonized BNC can increase the conductivity and lithium storage [ 63 ]. Researchers have observed improved properties of the electrode when gum [ 101 ] and polyimide (PI) [ 102 ] are used as binders instead of CMC. Chen et al [ 101 ] reported that CMC/Si/GE bionanocomposite as an electrode for LIB showed lower electrochemical properties compared to gum/Si/GE-based nanocomposite.…”

Section: Challenges and Opportunities Of Cellulose-based Bionanocompo...mentioning

confidence: 99%