TY - JOUR

T1 - Amorphous lithiophilic cobalt-boride@rGO interlayer for dendrite-free and highly stable lithium metal batteries

AU - Wu, Yu

AU - Ma, Fei

AU - Zhang, Ziheng

AU - Chen, Daiqian

AU - Yu, Hesheng

AU - Zhang, Xiaojuan

AU - Ding, Fei

AU - Zhang, Lin

AU - Chen, Yuanfu

N1 - Publisher Copyright: © 2024 The Author(s). EcoEnergy published by John Wiley & Sons Australia, Ltd on behalf of China Chemical Safety Association.

PY - 2024/6/21

Y1 - 2024/6/21

N2 - Abstract Lithium metal batteries (LMBs) are recognized to be crucial for secondary battery technology targeting electric vehicles and portable electronic devices. However, the undesirable growth of lithium dendrites would result in reduced capacity, short-circuit, and overheating, seriously hindering the practical applications of LMBs. To address this issue, a neoteric lithiophilic interlayer on a commercial polypropylene separator is presented for the first time, which is constructed by amorphous CoB nanoparticles decorated reduced graphene oxide nanosheets (CoB@rGO). Density Functional Theory calculations and experimental analysis reveal remarkable lithiophilicity features for CoB@rGO and provide multiple Li deposition sites and improved electrolyte wettability, which facilitates the formation of durable solid electrolyte interphase (SEI), reduces side reactions, and improves Li+ flux regulation for long-term cycling stability in LMBs. Taking advantage of these merits, the symmetric Li//Li cell with CoB@rGO/PP separator exhibits stable cycling for up to 1600 h at 1 mA cm?2 with 1 mAh cm?2. Employed with CoB@rGO separator, the Li//LiFePO4 full cell with a high LiFePO4 loading of 11 mg cm?2 delivers a high initial specific capacity of 115.3 mAh g?1 and a low decay rate of 0.08% per cycle after 200 cycles even at a high rate of 2C.

AB - Abstract Lithium metal batteries (LMBs) are recognized to be crucial for secondary battery technology targeting electric vehicles and portable electronic devices. However, the undesirable growth of lithium dendrites would result in reduced capacity, short-circuit, and overheating, seriously hindering the practical applications of LMBs. To address this issue, a neoteric lithiophilic interlayer on a commercial polypropylene separator is presented for the first time, which is constructed by amorphous CoB nanoparticles decorated reduced graphene oxide nanosheets (CoB@rGO). Density Functional Theory calculations and experimental analysis reveal remarkable lithiophilicity features for CoB@rGO and provide multiple Li deposition sites and improved electrolyte wettability, which facilitates the formation of durable solid electrolyte interphase (SEI), reduces side reactions, and improves Li+ flux regulation for long-term cycling stability in LMBs. Taking advantage of these merits, the symmetric Li//Li cell with CoB@rGO/PP separator exhibits stable cycling for up to 1600 h at 1 mA cm?2 with 1 mAh cm?2. Employed with CoB@rGO separator, the Li//LiFePO4 full cell with a high LiFePO4 loading of 11 mg cm?2 delivers a high initial specific capacity of 115.3 mAh g?1 and a low decay rate of 0.08% per cycle after 200 cycles even at a high rate of 2C.

KW - CoB@rGO interlayer

KW - dendrite-free lithium metal batteries

KW - functional separator

KW - long-term stability

KW - uniform lithium deposition

UR - http://www.scopus.com/inward/record.url?scp=105009341979&partnerID=8YFLogxK

U2 - 10.1002/ece2.38

DO - 10.1002/ece2.38

M3 - Article

VL - 2

SP - 299

EP - 310

JO - EcoEnergy

JF - EcoEnergy

SN - 2835-9380

IS - 2

ER -