US Government As Represented by the Secretary of the Army

University System of Maryland

U.S. Army Research Laboratory

Kang Xu

T Richard Jow

Shengshui Zhang

Chunsheng Wang

Michael S Ding

Oleg A Borodin

Liumin Suo

Arthur Von Wald Cresce

Peter Kofinas

Marshall A Schroeder

Lin Ma

Matthew D Widstrom

Arthur Von Cresce

Chongyin Yang

Arthur V Cresce

Travis P Pollard

Judith A Kim

Shengping Ding

To improve the performance of certain multivalent metal electrodes, the electrodes can be treated prior to use in an electrochemical cell by applying a solution comprising an acid to a surface of a multivalent metal electrode, then removing excess solution comprising the acid and drying the surface of the multivalent metal electrode. The resulting electrode has an outer interphase layer comprised of a hydrated hydroxychloride comprising the multivalent metal, where the interphase layer has a thickness of less than 5 μm.

Hydrochloric acidic surface treatment for multivalent battery metal electrode

The present invention is directed to aqueous solid polymer electrolytes that comprise a lithium salt and battery cells comprising the same. The present invention is also directed to methods of making the electrolytes and methods of using the electrolytes in batteries and other electrochemical technologies.

High performance air stable solid polymer electrolyte

The present invention is directed to aqueous and hybrid aqueous electrolytes that comprise a lithium salt. The present invention is also directed to methods of making the electrolytes and methods of using the electrolytes in batteries and other electrochemical technologies.

Aqueous and hybrid electrolytes with wide electrochemical stability windows

The present invention is directed to a hybrid high voltage aqueous electrolyte battery that combines Ni/MgNiHand Mg-ion rechargeable battery chemistries. The hybrid aqueous electrolyte battery can be used for plug-in hybrid electrical vehicles and electric vehicles.

Multiple-electron aqueous battery

The present invention is directed to aqueous solid state electrolytes that comprise a fluoride additive to stabilize the interface between the anode and aqueous electrolyte. The present invention is also directed to methods of making the solid state electrolyte materials and methods of using the solid state electrolyte materials in batteries and other electrochemical technologies.

High voltage aqueous electrolyte system for lithium metal or graphite anode

Disclosed is an electrochemical cell, which may be used for advanced rechargeable batteries. The electrochemical cell comprises two or more electrodes within an electrolyte solution, where the electrolyte solution containing (i) an aliphatic or cyclic sulfone and (ii) a metal perfluoroalkylsulfonylimide salt.

Sulfone sulfonylimide combinations for advanced battery chemistries

This invention described the preparation of a series of compounds that can be used as co-solvents, solutes or additives in non-aqueous electrolytes and their test results in various electrochemical devices. The inclusion of these novel compounds in electrolyte systems can enable rechargeable chemistries at high voltages that are otherwise impossible with state-of-the-art electrolyte technologies. These compounds are so chosen because of their beneficial effect on the interphasial chemistries formed at high potentials, such as 5.0 V class cathodes for new Li ion chemistries. The potential application of these compounds goes beyond Li ion battery technology and covers any electrochemical device that employs non-aqueous electrolytes for the benefit of high energy density resultant from high operating voltages.

Electrolytes in support of 5V Li ion chemistry

A series of polar and aprotic organic molecules, which, when used as solvents or additives in nonaqueous electrolytes, afford improved performance for electrochemical cells that operate at high voltages. These polar and aprotic solvents or additives may contain at least one unsaturated functionality per molecule. The unsaturated functionality is conjugated with the polar functionality of the molecule. The unsaturated functionality that is either a double or triple bond could be between carbon-carbon, or between carbon-heteroatom, or between hetroatom-heteroatom. Nonaqueous electrolyte solutions are provided comprising one or more lithium salts dissolved in the mixture solvents, which comprises, in all possible ratios, at least one of the polar, aprotic and unsaturated solvent or additives, one or more cyclic carbonic diesters such as ethylene carbonate, and one or more acyclic carbonic diesters such as dimethyl carbonate, diethyl carbonate, and ethylmethyl carbonate.

Nonaqueous electrolyte solvents and additives

A non-aqueous rechargeable electrochemical cell includes an electrolyte composition produced through the dissolution of a thermally stable lithium salt in a lactone solvent. The resulting cell has stable performance in a wide temperature range between &#x2212;40&#xb0; C. and 80&#xb0; C. The resulting cell operates across this wide temperature range with a commercially acceptable capacity retention, power loss characteristics, and safety characteristics across this temperature range.

Electrolyte formulations for wide temperature lithium ion batteries

A method of preparing a composite cathode active material having superior cell characteristics includes mixing and milling starting material, carbon and an organic complexing agent. The mixture is heated at a first temperature in an inert atmosphere to form a composite precursor, and then the precursor is ground and heated at a second temperature in an inert atmosphere to produce a carbon-containing composite cathode material having high electronic conductivity. The said composite cathode has a general formula of LiFeMPO&#x2014;C, within 0&#x2266;x&#x3c;1, M is selected from the group consisting of Co, Ni, V, Cr, Mn and a mixture thereof.

Method of preparing a composite cathode active material for rechargeable electrochemical cell

A method for enhancing the performance characteristics of a battery through the use of the electrolyte composition comprised of a non-aqueous solvent, and a salt mixture. The salt mixture includes an alkali metal electrolyte salt and an additive salt having an anion of a mixed anhydride of oxalic acid and boric acid. Specific additive salts include lithium bis(oxalato) borate and lithium oxalyldifluoroborate. Particular electrolyte salts comprise LiPF6 and LiBF4. The additive salt is present in an amount of 0.1-60 mole percent of the total of the additive salt and electrolyte salt content of the electrolyte.

Non-aqueous solvent electrolyte battery with additive alkali metal salt of a mixed anhydride combination of oxalic acid and boric acid

A non-aqueous electrolyte solution for lithium or a lithium ion cell, which improves lithium ion cell capacity retention and enhances storage life thereof. The non-aqueous solution can be implemented in the context of an electrolyte system that includes a lithium salt dissolved in a solvent formed from a mixture of one or more cyclic esters, and/or one or more chain esters, and at least one lactam based solvent. Such a system is suited for use with electrochemical energy storage devices, which are based on non-aqueous electrolytes, such as high energy density batteries and/or high power electrochemical capacitors. Such an electrochemical storage devices is generally based on non-aqueous electrolytes that include lithium salt dissolved in a solvent system.

Solvent systems comprising a mixture of lactams and esters for non-aqueous electrolytes and non-aqueous electrolyte cells comprising the same

A lithium battery includes an electrolyte comprised of a non-aqueous solvent, and a salt mixture. The salt mixture includes an alkali metal electrolyte salt and an additive salt having an anion of a mixed anhydride of oxalic acid and boric acid. Specific additive salts include lithium bis(oxalato) borate and lithium oxalyldifluoroborate. Particular electrolyte salts comprise LiPFand LiBF. The additive salt is present in an amount of 0.1&#x2013;60 mole percent of the total of the additive salt and electrolyte salt content of the electrolyte. Also disclosed is a method for enhancing the performance characteristics of a lithium battery through the use of the electrolyte composition. Also disclosed is the compound lithium oxalyldifluoroborate.

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North Potomac, MD, United States of America

Kang Xu