Battelle Memorial Institute

Jianming Zheng

Wu Xu

Jiguang Zhang

Shuru Chen

Jun Liu

Ji-Guang Zhang

Jie Xiao

Chongmin Wang

Pengfei Yan

Wengao Zhao

Gordon Lee Graff

Wei Wang

Zhenguo Yang

Yuyan Shao

Dongping Lu

Xilin Chen

Brian D G Adams

High energy density cathode materials, such as LiNiMnCoO2 (NMC) cathode materials, with improved discharge capacity (hence energy density) and enhanced cycle life are described. A solid electrolyte, such as lithium phosphate infused inside of secondary particles of the cathode material demonstrates significantly enhanced structural integrity without significant or without any observable particle cracking occurring during charge/discharge processes, showing high capacity retention of more than 90% after 200 cycles at room temperature. In certain embodiments the disclosed cathode materials (and cathodes made therefrom) are formed using nickel-rich NMC and/or are used in a battery system with a non-aqueous dual-Li salt electrolytes.

High capacity and stable cathode materials

Embodiments of a method for cycling a rechargeable alkali metal battery with high Coulombic efficiency (CE) are disclosed. A slow charge/rapid discharge protocol is used in conjunction with a concentrated electrolyte to achieve high CE in rechargeable lithium and sodium batteries, include anode-free batteries. In some examples, the CE is &#x2265;99.8%.

High Coulombic efficiency cycling of metal batteries

Embodiments of localized superconcentrated electrolytes (LSEs) for stable operation of electrochemical devices, such as rechargeable batteries, supercapacitors, and sensors, are disclosed. Electrochemical devices, such as rechargeable batteries, supercapacitors, and sensors, including the LSEs are also disclosed. The LSEs include an active salt, a solvent in which the active salt is soluble, and a diluent in which the active salt is insoluble or poorly soluble. In certain embodiments, such as when the solvent and diluent are immiscible, the LSE further includes a bridge solvent.

Localized superconcentrated electrolytes for stable cycling of electrochemical devices

Improved lithium-sulfur energy storage systems can utilizes LiSas a component in an electrode of the system. For example, the energy storage system can include a first electrode current collector, a second electrode current collector, and an ion-permeable separator separating the first and second electrode current collectors. A second electrode is arranged between the second electrode current collector and the separator. A first electrode is arranged between the first electrode current collector and the separator and comprises a first condensed-phase fluid comprising LiS. The energy storage system can be arranged such that the first electrode functions as a positive or a negative electrode.

[object Object]

Disclosed herein are embodiments of a lithium-ion battery system comprising an anode, an anode current collector, and a layer of lithium metal in contact with the current collector, but not in contact with the anode. The lithium compensation layer dissolves into the electrolyte to compensate for the loss of lithium ions during usage of the full cell. The specific placement of the lithium compensation layer, such that there is no direct physical contact between the lithium compensation layer and the anode, provides certain advantages.

Lithium compensation for full cell operation

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Richland, WA, United States of America

Jianming Zheng