Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

California Institute of Technology

Centre National De La Recherche Scientifique

Institut Polytechnique De Grenoble

Cantre National De Le Recherche Scientifique

Commissariat a L'energie Atomique

Renault S.a.s.

Renault

Solvay Specialty Polymers France

Yvan Reynier

Rachid Yazami

Marianne Chami

Sébastien Patoux

Brent T Fultz

Bruno Delobel

Joseph McMenamin

Celine Barchasz

Sebastien Patoux

Céline Barchasz

Jean-François Colin

Thibaut Gutel

Olivier Masson

Willy Porcher

Christine Lefrou

Rémy Mingant

Guillaume Claude

Sophie Chazelle

Florence Masse

Vasily Tarnopolskiy

Mohamed Chakir

Marc Bohnke

An electrochemical cell for a lithium accumulator comprising: a negative electrode comprising metallic lithium as active material; a positive electrode associated with an aluminium current collector; and an electrolyte placed between the negative electrode and the positive electrode, wherein the negative electrode is provided with a layer comprising a compound containing aluminium at its face in contact with the electrolyte, and in that the electrolyte comprises at least one lithium salt chosen from among lithium imide, lithium triflate, lithium perchlorate salts and mixtures thereof.

Electrochemical cell for lithium accumulator comprising a specific negative electrode made of metallic lithium and a positive electrode on aluminium collector

The invention relates to a device for a lithium electrochemical generator, having an elongate shape along a longitudinal axis (X), comprising a strip comprising a current collector central portion that is at least partially electrically conductive, in which at least one of the two main surfaces is covered with an electrode consisting of a lithium insertion material, and at least two side peripheral portions connected to the central portion and extending transversely to the longitudinal axis, the side peripheral portions being made of an electrically insulating material comprising at least one polymer, the insulating material of at least one of the two side portions being resiliently or plastically deformable, the dimensions of the latter also being determined such as to allow the deformation thereof without breaking during the winding of the strip about a winding axis, which is transverse to the axis (X) and adjacent to the other one of the two side peripheral portions. The invention relates to the method for manufacturing a related bipolar battery.

Current collector having a built-in sealing means, bipolar battery including such a collector, method for manufacturing such a battery

The invention relates to a method for determining the end-of-charging condition of a lithium-ion accumulator with a negative electrode formed with at least one alloy, according to which a surface pressure with a determined force from the external portion of the accumulator (A) against an element (2, 2', 3) is detected, the surface pressure being generated by the thickness increase due to ion insertion at the negative electrode and thereby defining the end-of-charging condition.

Method for determining when a Li-ion cell comprising a negative electrode made of an alloy is fully charged, associated cell and battery

The invention relates to a novel lithium-sulphur type electrochemical battery A. According to the invention, the positive electrode (1) is made solely from a porous electronic conductor substrate forming a current collector and the electrolyte contains lithium polysulphides (LiSn) as sources of lithium and sulphur ions, said lithium polysulphides being formed ex-situ and not in the battery. The invention also relates to a method for the production of said device.

Lithium-sulphur (Li-S)-type electrochemical battery and production method thereof

Described are systems and methods for accurately characterizing thermodynamic and materials properties of electrodes and battery systems and for characterizing the state of health of electrodes and battery systems. Measurement of physical attributes of electrodes and batteries corresponding to thermodynamically stabilized electrode conditions permit determination of thermodynamic parameters, including state functions such as the Gibbs free energy, enthalpy and entropy of electrode/electrochemical cell reactions, that enable prediction of important performance attributes of electrode materials and battery systems, such as energy, power density, current rate, cycle life and state of health. Also provided are systems and methods for charging a battery according to its state of health.

Methods and systems for thermodynamic evaluation of battery state of health

The method for determining the state of charge of a battery includes measurement of an electric parameter of the battery during a charging or discharging phase of the battery followed by placing the battery in open circuit during a rest period. During the rest period, at least two values of the voltage at the battery terminals are measured. An indicator is then calculated according to the electric parameter and to values of the voltage measured during the rest period, and the state of charge corresponding to this indicator is then determined by means of a calibration curve representative of the variations of the indicator as a function of the state of charge of the battery.

Method for determining the state of charge of a battery in charging or discharging phase

Methods for thermodynamic evaluation of battery state of health

The present invention provides systems and methods for accurately characterizing thermodynamic and materials properties of electrodes and electrochemical energy storage and conversion systems. Systems and methods of the present invention are configured for simultaneously collecting a suite of measurements characterizing a plurality of interconnected electrochemical and thermodynamic parameters relating to the electrode reaction state of advancement, voltage and temperature. Enhanced sensitivity provided by the present methods and systems combined with measurement conditions that reflect thermodynamically stabilized electrode conditions allow very accurate measurement of thermodynamic parameters, including state functions such as the Gibbs free energy, enthalpy and entropy of electrode/electrochemical cell reactions, that enable prediction of important performance attributes of electrode materials and electrochemical systems, such as the energy, power density, current rate and the cycle life of an electrochemical cell.

Electrochemical thermodynamic measurement system

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Grenoble, France

Yvan Reynier