Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 12, Pages 8154-8161Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b03046
Keywords
polyacrylonitrile; binder; nano-Si; anode; Li-ion battery
Funding
- Shanghai Leading Academic Discipline Project [B502]
- Shanghai Key Laboratory Project [08DZ2230500]
- Chinese State Scholarship Fund [201408310121]
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Well-defined polyacrylonitriles (PANs) with different molecular weights were synthesized through an activator regenerated by electron transfer atom-transfer radical polymerization method and employed as binders in silicon negative electrode for lithium-ion batteries. Compared with poly(vinylidene fluoride) and carboxyl methyl cellulose as binders, the electrode performance of PANs is well-improved. Specifically, at 100 mA from 0.01 to 1.5 V, the initial discharge capacity of PAN100-based electrode is 4147.8 mA h g(-1) and still remains about 1639.6 mA h g(-1) over 50 cycles. A comprehensive understanding on the improvement mechanism is preliminarily discussed. The results indicate that the superior performance largely depends on the higher lithium ion diffusion efficiency in PAN which results from the weak interaction between lithium ions and PAN polymer chain, and the hydrogen bonds among the nitrile group (C N) of PAN, Si nanoparticles, and the current collector, which will lead to an efficient coating of PAN with the Si particles and well-improved adhesion strength, synergistically depressing the structural deterioration of silicon electrodes.
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