The present disclosure generally relates to apparatus and processes for monitoring the structural health of an energy storage device, and more specifically to energy storage devices with operando monitoring and processes of use. In an aspect, an apparatus is provided that includes an energy storage device comprising an electrode, the electrode comprising a nanotube network and an active material. The apparatus further includes a processor configured to determine a first value of potential change of the electrode of the energy storage device and to compare the first value of potential change to a threshold value or range.

Method for determining the state of health of a lithium-ion battery A method for determining the state of health (SOH) of a lithium-ion battery (1), comprising: a first step (E1) of determining a function (f) of the incremental capacity of the battery, a second step (E2) of identifying peaks (P1, P2, P3) of the function (f) determined in the first step (E1), a third step (E3) of determining voltages (U1, U2, U3) across the terminals of the battery (1) for which said peaks (P1, P2, P3) are obtained, a fourth step (E4) of determining the amplitudes of said peaks (P1, P2, P3), a sixth step (E6) of determining the state of health (SOH) of the battery (1) on the basis of a degradation mode of the battery and on the basis of the amplitudes determined in the fourth step (E4).

Provided are a positive electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same. The positive electrode for a rechargeable lithium battery includes a current collector, a first positive electrode active material layer on the current collector and including a first positive electrode active material, and a second positive electrode active material layer on the first positive electrode active material layer and including a second positive electrode active material, wherein the first positive electrode active material layer includes ceramic particles, a particle diameter of each of the ceramic particles is in a range from about 10 nm to about 500 nm, and the ceramic particles are included only in the first positive electrode active material layer.

This disclosure relates to battery cells, and more particularly, electrolyte formulations that reduce thermal runaway in lithium ion battery cells.

The present invention provides a method for manufacturing a positive electrode material for an electricity storage device that can reduce excessive reactions between particles of a positive electrode active material precursor powder and between the positive electrode active material precursor powder and a solid electrolyte during thermal treatment to achieve excellent charge and discharge characteristics. A method for manufacturing a positive electrode material for an electricity storage device includes the step of subjecting a raw material containing a positive electrode active material precursor powder made of an amorphous oxide material to thermal treatment, wherein the positive electrode active material precursor powder has a crystallization temperature of 490° C. or lower.

The present invention provides a method of making fire-resistant battery cells comprising nonflammable electrolytes, and use thereof.

A silicon-based negative electrode material and a method for preparing the same, a battery including the silicon-based negative electrode material, and a terminal are provided. The silicon-based negative electrode material includes a silicon-based matrix with a low silicon-oxygen ratio and silicon-based particles with a high silicon-oxygen ratio dispersed in the silicon-based matrix with the low silicon-oxygen ratio. A silicon-oxygen ratio of the silicon-based matrix with the low silicon-oxygen ratio is 1:x, and 1<x≤2. A silicon-oxygen ratio of the silicon-based particles with the high silicon-oxygen ratio is 1:y, and 0≤y≤1. The silicon-based matrix with the low silicon-oxygen ratio is silicon dioxide, or the silicon-based matrix with the low silicon-oxygen ratio includes silicon dioxide and silicon-containing crystal particles dispersed in the silicon dioxide.

The present invention discloses a high-efficiency working method for a battery energy storage system at low temperature. In the present invention, combined operation of two kinds of batteries is taken as an example to build an energy storage system framework at low temperature. A lithium iron phosphate battery and a lithium titanate battery are selected for combined operation to achieve complementary advantages of the two kinds of batteries; then, an energy storage system model for combined operation of the two kinds of batteries with the consideration of an impact of temperature on charging/discharging efficiency of the batteries is built; and finally, an optimal dispatching solution for a battery energy storage system composed of the lithium titanate battery and the lithium iron phosphate battery at low temperature is provided. By the above steps, the present invention achieves high-efficiency outputting of electricity of the battery energy storage system at low temperature, achieves complementary advantage of different kinds of batteries, and also ensures low overall cost.

A composite material and a method for fabricating the same. The composite material includes graphene and active material particles. Each surface of the active material particles is conformally coated with said graphene. The method includes forming a mixture containing an active material, graphene, ethyl cellulose (EC) polymer and multiwalled carbon nanotubes, and thermally annealing the mixture at an annealing temperature in an oxidizing environment to decompose the majority of EC, thereby resulting in the composite material having each active material particle coated with a conformal graphene coating.

The present invention relates to a method for manufacturing an electrode for a lithium secondary battery, wherein, at the time of manufacturing of an electrode for a lithium secondary battery, a drying speed can be reduced through the steps of: applying a dewatering process using a porous substrate to remove a considerable amount of solvent from electrode slurry in advance; performing pressurization in a state of the porous substrate, an electrode layer, and an electrode current collector; performing additional dewatering; and separating the porous substrate from the electrode layer and then drying the electrode layer, and thus the electrode productivity can be maximized without degradation of electrode performance.