Toward the Practical Use of Cobalt-Free Lithium-Ion Batteries by an Advanced Ether-Based Electrolyte

Journal Article · Wed Sep 08 00:00:00 EDT 2021 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.1c12072· OSTI ID:1820395

Jia, Hao  ^[1]; Zhang, Xianhui  ^[1]; Xu, Yaobin  ^[1]; Zou, Lianfeng  ^[1]; Kim, Ju-Myung  ^[1]; Gao, Peiyuan  ^[1]; Engelhard, Mark H.  ^[1]; Li, Qiuyan  ^[1]; Niu, Chaojiang  ^[1]; Matthews, Bethany E.  ^[1]; Lemmon, Teresa L.  ^[1]; Hu, Jiangtao  ^[1]; Wang, Chongmin  ^[1]; Xu, Wu  ^[1]

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1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

The criticality of cobalt (Co) has been motivating the quest for Co-free positive electrode materials for building lithium (Li)-ion batteries. However, the Co-free positive electrode materials usually suffer from relatively fast capacity decay when coupled with conventional LiPF₆-organocarbonates electrolytes. To address this issue, a 1,2-dimethoxyethane (DME) based localized high concentration electrolyte (LHCE) was developed and evaluated in a Co-free Li-ion cell chemistry (Graphite||LiNi_0.96Mg_0.02Ti_0.02O₂). Extraordinary capacity retentions were achieved with the LHCE in coin cells (95.3%), single layer pouch cells (79.4%) and high capacity loading double layer pouch cells (70.9 %) after being operated within the voltage range of 2.5-4.4 V for 500 charge/discharge cycles. The capacity retentions of counterpart cells using LiPF6 based conventional electrolyte only reached 61.1%, 57.2% and 59.8%, respectively. Mechanistic studies reveal that the superior electrode/electrolyte interphases formed by the LHCE and the intrinsic chemical stability of the LHCE account for the excellent electrochemical performance in the Co-free Li-ion cells.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
• Grant/Contract Number: AC05-76RL01830; EE0008444
• OSTI ID: 1820395
• Report Number(s): PNNL-SA-162906
• Journal Information: ACS Applied Materials and Interfaces, Vol. 13, Issue 37; ISSN 1944-8244
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
Co-free Ni-rich cathode
lithium ion batteries
cycle life
localized high concentration electrolyte
electrode/electrolyte interphases
electrodes
electrochemical cells
surface chemistry
electrolytes
materials