Synthesis of Si/C Composites by the Co-Carbonization of Phenolic Resin with Various Polysilane Polymers and Their Application to the Anode Material for Li+ Batteries.

Mukai Shin Robert, Yamamoto Yu, Masuda Takao, Tamon Hajime

doi:10.1252/kakoronbunshu.29.221

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Other Title

新しい電池の開発およびその関連技術　　フェノール樹脂とポリシランの共炭化によるＳｉ／Ｃ複合材の作製とＬｉ｀＋´電池用負極材への応用
フェノール樹脂とポリシランの共炭化によるSi/C複合材の作製とLi+電池用負極材への応用
フェノールジュシトポリシランノキョウタンカニヨル Si C フクゴウザイノサクセイト Li デンチヨウフキョクザイエノオウヨウ

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Description

Si/C composites were synthesized by the co-carbonization of 3,5-xylenol-derived novolac resin with various polysilane polymers. A significant increase in the Li⁺ reversible capacity due to the inclusion of Si in the C matrix was observed. However, the Li⁺ irreversible capacities of the materials were also fairly large. The irreversible Li⁺ capacities were fand to be explainable by two factors: the consumption of Li⁺ due to the formation of solid electrolyte interface layers within the materials, the amount of which depends on the pore structure of the material, and the trapping of Li⁺ by the O included in the material. It was also found that the Si in the materials synthesized using polydiphenylsilane as the Si source could store up to an average of 2.4 Li⁺ per atom. These results indicate that by selecting a proper C source for the co-carbonization with polysilane polymers, an anode material for Li⁺ batteries with a large reversible capacity and small irreversible capacity can be obtained.

Journal

KAGAKU KOGAKU RONBUNSHU

KAGAKU KOGAKU RONBUNSHU 29 (2), 221-225, 2003

The Society of Chemical Engineers, Japan

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