4163results about How to "Improve ionic conductivity" patented technology

The present invention relates to composite solid polymer electrolyte membranes (SPEMs) which include a porous polymer substrate interpenetrated with a water soluble ion-conducting material. SPEMs of the present invention are useful in electrochemical applications, including fuel cells and electrodialysis.

Disclosed are ionically conductive composites for protection of active metal anodes and methods for their fabrication. The composites may be incorporated in active metal negative electrode (anode) structures and battery cells. In accordance with the invention, the properties of different ionic conductors are combined in a composite material that has the desired properties of high overall ionic conductivity and chemical stability towards the anode, the cathode and ambient conditions encountered in battery manufacturing. The composite is capable of protecting an active metal anode from deleterious reaction with other battery components or ambient conditions while providing a high level of ionic conductivity to facilitate manufacture and / or enhance performance of a battery cell in which the composite is incorporated.

Disclosed are ionically conductive membranes for protection of active metal anodes and methods for their fabrication. The membranes may be incorporated in active metal negative electrode (anode) structures and battery cells. In accordance with the invention, the membrane has the desired properties of high overall ionic conductivity and chemical stability towards the anode, the cathode and ambient conditions encountered in battery manufacturing. The membrane is capable of protecting an active metal anode from deleterious reaction with other battery components or ambient conditions while providing a high level of ionic conductivity to facilitate manufacture and / or enhance performance of a battery cell in which the membrane is incorporated.

The present invention is directed to the use of carbon nanotubes and / or electrolyte structures comprising ionic liquids in various electrochemical devices, such as ultracapacitors.

A composite solid electrolyte include a monolithic solid electrolyte base component that is a continuous matrix of an inorganic active metal ion conductor and a filler component used to eliminate through porosity in the solid electrolyte. In this way a solid electrolyte produced by any process that yields residual through porosity can be modified by the incorporation of a filler to form a substantially impervious composite solid electrolyte and eliminate through porosity in the base component. Methods of making the composites is also disclosed. The composites are generally useful in electrochemical cell structures such as battery cells and in particular protected active metal anodes, particularly lithium anodes, that are protected with a protective membrane architecture incorporating the composite solid electrolyte. The protective architecture prevents the active metal of the anode from deleterious reaction with the environment on the other (cathode) side of the architecture, which may include aqueous, air and organic liquid electrolytes and / or electrochemically active materials.

The invention discloses a ceramic and polymer composite coated lithium ion diaphragm and a preparation method thereof. The ceramic and polymer composite coated lithium ion diaphragm comprises a polyolefin porous diaphragm, a ceramic coating coated on one side or the two sides of the diaphragm surface and a polymer coating coated on the ceramic surface or the diaphragm surface. The composite diaphragm prepared by the preparation method disclosed by the invention has the advantages that the heat resistance of the diaphragm is greatly improved, and the infiltration of an electrolyte is improved; the bonding strength of the diaphragm and a positive and negative pole piece is improved, so that the internal short-circuit caused by staggering between the diaphragm and an electrode is prevented; meanwhile, the hardness of a battery is improved, so that the safety performance of the battery is greatly improved. In the production process, the ceramic coating and the polymer coating are uniform in thickness and good in uniformity and facilitate continuous and large-scale production.

A polyolefin separator having an heat-resistant ultrafine fibrous layer and a secondary battery using the same, in which the separator has a shutdown function, low thermal contraction characteristics, thermal endurance, excellent ionic conductivity, excellent cycling characteristics at the time of battery construction, and excellent adhesion with an electrode. The present N invention adopts a very simple and easy process to form an ultrafine fibrous layer through an electrospinning process, and at the same time, to remove solvent and to form pores. Accordingly, the separator of the present invention is useful particularly for electrochemical devices used in a hybrid electric automobile, an electric automobile, and a fuel cell automobile, requiring high thermal endurance and thermal stability.

The invention belongs to the technical field of a lithium ion battery, and particularly relates to stabilization lithium metal powder. The stabilization lithium metal powder has a core shell structure; and the core layer is formed by lithium metal and is a composition consisting of an electron good conductor and a lithium ion good conductor. Compared with the prior art, the stabilization lithium metal powder provided by the invention has the advantages that: in the process of performing pre-lithiation of the anode-active material by use of the stabilization lithium metal powder, no limitation is imposed on the pressure of the cold pressing process, the 'dead lithium' disabling lithiation reaction is not produced, and the lithiation efficiency of the lithium metal powder is improved; and moreover, since the shell layer left on the electrode surface has good electron and lithium ion conductivity after the pre-lithiation, the electron and ion conductivity of the anode can be effectively improved so as to improve the electrochemical performance of the battery. In addition, the invention also discloses an anode strip performing pre-lithiation by use of the stabilization lithium metal powder, and a lithium ion battery comprising the anode strip.