Carbon interconnected microsized Si film toward high energy room temperature solid-state lithium-ion batteries  

作　　者：Xin Li Ling Zhang Yunyan Fan Shaojing Lin Yong Lin Yongsheng Ying Meijiao Hu Haiying Gao Xianri Xu Zhongbiao Xia Xinchuan Lin Junjie Lu Xiang Han 

机构地区：[1]School of Information Engineering,Fujian Business University,Fuzhou 350012,China [2]College of Materials Science and Engineering,Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry University,Nanjing 210037,China [3]College of Artificial Intelligence,Yango University,Fuzhou 350015,China

出　　处：《Chinese Chemical Letters》2025年第2期503-507,共5页中国化学快报(英文版)

基　　金：financially supported by the Natural Science Foundation of Fujian Province(No.2021J01333);the funding from the Fujian Education Department of China(No.JAT210582)。

摘　　要：Solid-state batteries(SSBs)with high-capacity Si anodes have been regarded as one of the most promising candidates to meet the large scale energy storage and electrical vehicles due to its intrinsic safety and potential high energy density.However,Si suffers from poor electrical conductivity and huge volume change and particles fracture during lithiaiotn and delithiation,which induces low practical energy density.In addition,the SSBs are often operated at high temperature due to the poor physical contact and huge resistance between Si and solid-state electrolyte(SSE).To improve the bulk electronic/ionic conductivity of Si and its interfacial compatibility with SSE,herein,a binder free and self-supporting Si/C film was developed.The monolithic carbon not only enhance the electric conductivity but also release huge stress during lithiation and delithiation.In addition,paired with the flexible and soft poly(vinylidene fluoride)-co-hexafluoropropylene(PVDF-HFP)and Li_(1.3)A_(l0.3)Ti_(1.7)(PO_(4))_(3)(LATP)solid-state electrolyte,a LiF-rich and electrochemical stable solid-electrolyte interphase(SEI)layer is in-situ engineered.The fast bulk and interfacial ionic transportation as well as the mechanical integrity of MSi enable high performance SSBs at room temperature.As a result,high specific capacity of 2137 m Ah/g with an initial Coulombic efficiency of 83.2%is obtained at a rate of 0.5 A/g.Even at a high rate of 3 A/g,the specific capacity is1793 m Ah/g.At a rate of 1 A/g,the Si/C anode delivers a long cycling performance over 500 cycles while maintains a capacity of 1135 mAh/g.This work provides a new strategy that combines charge transfer kinetics and interfacial chemistry design toward high energy density Si-based SSBs.

关 键 词：Lithium-ion battery Solid-state electrolyte Silicon anode Carbon coating INTERPHASE 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]