title: Addressing the Interface Issues in All-Solid-State Bulk-Type Lithium Ion Battery via an All-Composite Approach.
abstract: All-solid-state bulk-type lithium ion batteries (LIBs) are considered ultimate solutions to the safety issues associated with conventional LIBs using flammable liquid electrolyte. The development of bulk-type all-solid-state LIBs has been hindered by the low loading of active cathode materials, hence low specific surface capacity, and by the high interface resistance, which results in low rate and cyclic performance. In this contribution, we propose and demonstrate a synergistic all-composite approach to fabricating flexible all-solid-state LIBs. PEO-based composite cathode layers (filled with LiFePO4particles) of ∼300 μm in thickness and composite electrolyte layers (filled with Al-LLZTO particles) are stacked layer-by-layer with lithium foils as negative layer and hot-pressed into a monolithic all-solid-state LIB. The flexible LIB delivers a high specific discharge capacity of 155 mAh/g, which corresponds to an ultrahigh surface capacity of 10.8 mAh/cm2, exhibits excellent capacity retention up to at least 10 cycles and could work properly under harsh operating conditions such as bending or being sectioned into pieces. The all-composite approach is favorable for improving both mesoscopic and microscopic interfaces inside the all-solid-state LIB and may provide a new toolbox for design and fabrication of all-solid-state LIBs.
authors.affiliation: School of Materials Science and Engineering, State Key Lab of New Ceramics and Fine Processing, Tsinghua University , Beijing 100084, China.
authors.forename: Ru-Jun
authors.initials: RJ
authors.lastname: Chen
authors.affiliation: School of Materials Science and Engineering, State Key Lab of New Ceramics and Fine Processing, Tsinghua University , Beijing 100084, China.
authors.forename: Yi-Bo
authors.initials: YB
authors.lastname: Zhang
authors.affiliation: School of Materials Science and Engineering, State Key Lab of New Ceramics and Fine Processing, Tsinghua University , Beijing 100084, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Liu
authors.affiliation: School of Materials Science and Engineering, State Key Lab of New Ceramics and Fine Processing, Tsinghua University , Beijing 100084, China.
authors.forename: Bing-Qing
authors.initials: BQ
authors.lastname: Xu
authors.affiliation: School of Materials Science and Engineering, State Key Lab of New Ceramics and Fine Processing, Tsinghua University , Beijing 100084, China.
authors.forename: Yuan-Hua
authors.initials: YH
authors.lastname: Lin
authors.affiliation: School of Materials Science and Engineering, State Key Lab of New Ceramics and Fine Processing, Tsinghua University , Beijing 100084, China.
authors.forename: Ce-Wen
authors.initials: CW
authors.lastname: Nan
authors.affiliation: School of Materials Science and Engineering, State Key Lab of New Ceramics and Fine Processing, Tsinghua University , Beijing 100084, China.
authors.forename: Yang
authors.identifier: http://orcid.org/0000-0002-1421-0629
authors.initials: Y
authors.lastname: Shen
keywords: Li7La3Zr2O12,; PEO; bulk-type all-solid-state battery; composite; lithium ion battery; solid-state electrolyte