33results about How to "Solve capacity fading" patented technology

A system for evaluating a redox flow battery according to an embodiment of the present disclosure includes: a control unit configured to control the path of a flow channel connected between a detection cell and the redox flow battery or a flow channel connected between the detection cell and an agitator; and an evaluation unit configured to evaluate any one of the state of charge, capacity fade and oxidation number balance of an electrolyte, which is used in the redox flow battery, by measuring a current or voltage of the detection cell based on the controlling of the path by the control unit. According to the present disclosure, the capacity fade problem of a redox flow battery can be quickly coped with by evaluating the information of the positive and negative electrode electrolytes on battery capacity fade and information about the valence balance of the electrolytes in situ.

The invention belongs to the field of large-scale electrical energy storage of liquid metal batteries, and discloses a temperature regulation method for reducing battery capacity attenuation and lowering energy consumption by reducing the temperature of an electric pile in a suspend mode of a liquid metal battery in energy storage application. The temperature regulation method comprises the following steps: (a), detecting the temperature of the liquid metal battery by using temperature detecting equipment to obtain the current temperature thereof; (b), reducing the current temperature of the liquid metal battery and monitoring the current temperature in real time, and converting electrodes and an electrolyte in the liquid metal battery from a liquid phase to a colloidal state or solid phase so as to reduce the solubility of the electrodes in the electrolyte and lower the energy consumption of the liquid metal battery; (c), when the current operating temperature is reduced to 25 DEG C to the operating working temperature range, stopping reduction in the current operating temperature, and meanwhile maintaining the final temperature of the liquid metal battery at the current operatingtemperature. By the temperature regulation method, the battery capacity attenuation in the suspend mode of the liquid metal battery is reduced and additional electrical energy loss is reduced.

The invention discloses an electrolyte for a flow battery and a polyhalide-chromium flow battery. The electrolyte for the flow battery is prepared by reacting cheap and easily available chromium hydroxide with hydrochloric acid and hydrobromic acid. Before charging (the state of charge is 0%), the components of the positive and negative electrolyte are consistent, and include trivalent chromium ions, chloride ions, bromide ions and hydrogen ions. The electrolyte has the beneficial effects that: the electrolyte for the flow battery has the advantages of high energy density, low cost, high charging and discharging performance, long cycle life, wide operating temperature interval and the like, and has a wide application prospect in the field of fixed large-scale power storage.

The invention discloses a preparation method of a flexible lithium ion battery and a network lithium titanate electrode structure. The preparation method of the flexible lithium-ion battery includes: growing a network lithium titanate on a titanium sheet as a negative electrode material; making a coated lithium manganate nanorod as a positive electrode material; The sandwich shape is stacked together and placed in the middle of two layers of polydimethylsiloxane PDMS films for packaging to complete the preparation of flexible lithium-ion batteries. The flexible lithium-ion battery disclosed in the present invention adopts network-structured lithium titanate, which can make full use of the advantages of the one-dimensional structure and the three-dimensional network structure, and increase the contact area between the active material and the electrolyte. The flexible lithium-ion battery disclosed by the invention can maintain high stability in a bent state, and realize dozens of charging and discharging cycles.

The invention discloses a charge-discharge control method and system of a redox flow battery and the redox flow battery. The method comprises the following steps of 1, detecting SOC of the redox flow battery; 2, judging whether the SOC of the redox flow battery is between an SOC lower limit and an SOC upper limit or not, if yes, executing the step 3, otherwise executing the step 4; 3, maintaining a voltage of the redox flow battery unchanged; and 4, adjusting the voltage of the redox flow battery to be lower than a first preset voltage when the SOC of the redox flow battery is larger than or equal to the SOC upper limit, and adjusting the voltage of the redox flow battery to be between the first preset voltage and a second preset voltage when the SOC of the redox flow battery is smaller than or equal to the SOC lower limit, wherein the second preset voltage is higher than the first preset voltage. By the method, the problems of side reaction is easy to generate in the redox flow battery under a high SOC condition and capacity attenuation of the redox flow battery caused by high SOC charge for a long time are prevented, and meanwhile, the upper limit of a charging voltage can be increased under a low SOC condition so as to improve charging quantity.

The invention discloses a silicon-carbon negative electrode material for lithium-ion batteries, which has a ring structure with an outer diameter of 2-15 μm and an inner diameter of 0.5-5 μm; Agglomerated silicon particles. The invention also discloses a preparation method of the material, comprising: step 1: preparing a polymer solution; step 2: adding an organic carbon source to the polymer solution; step 3: adding silicon powder to the polymer solution to prepare a suspension; Step 4: transfer the suspension to a sand mill for sand grinding; Step 5: add a dispersant to the sand-milled suspension and stir evenly; spray dry to obtain a black powder; Step 6: dry the black powder in an argon atmosphere heat treatment. The hollow ring structure of the lithium ion negative electrode silicon carbon material with a ring structure of the present invention solves the problem of capacity attenuation caused by volume expansion in the cycle process, and has high initial charge and discharge efficiency, high specific capacity, and stable cycle performance.

The invention discloses a preparation of a composite porous membrane for a flow battery and its application in a flow battery, which is prepared from one or more than two kinds of organic polymer resin or sulfonated polymer resin as raw materials The porous membrane is used as a matrix, and cationic and anionic organic resins are respectively compounded on both sides of the matrix to form a composite porous membrane. The preparation method of this type of composite membrane is simple, the process is environmentally friendly, the thickness of the assembled layer is controllable, and the ion selectivity is adjustable. Compared with the original porous diaphragm membrane, the composite membrane has better ion conductivity and vanadium ion barrier ability, and the ion selectivity is greatly improved. In addition, the composite membrane can effectively inhibit the migration of electrolyte solution and solve the problem of capacity fading.

The invention discloses an electrolyte storage tank, a redox flow battery, a box-type redox flow battery system and a charge-discharge control method of redox flow battery. A ring tube I and a ring tube II are arranged in the electrolyte storage tank, wherein the ring tube II communicates with an electrolyte return hole, the ring tube I communicates with an electrolyte output, the annular perimeter of the ring tube I is not equal to the annular perimeter of the ring tube II, and a plurality of liquid holes are formed in tube walls of both of the annular tube I and the annular tube II. By a multi-layer ring tube structure in the storage tank, an electrolyte flowing dead zone of an electrolyte in the storage tank is greatly reduced, the flowing of the electrolyte is more uniform, and the utilization of the electrolyte is effectively improved; and moreover, since the longitudinal distance between the electrolyte output and the electrolyte return hole is reduced, the problem of SOC lag is effectively solved, and the SOC monitoring accuracy of the redox flow battery is improved.

The present disclosure relates to a method for pretreating a nano-hollow silicon / carbon electrode material of an electrochemical energy storage device with a solvent and solvent-in-silicon particles. Nano-scale silicon-in-solvent particles pretreated by the method of the present disclosure, a method for preparing an electrode using the nano-scale silicon-in-solvent particles, an electrode prepared by the electrode preparation method, and an electrochemical device comprising the electrode. energy storage device. The method according to the present disclosure solves the delamination phenomenon caused by the low density of hollow silicon in the conventional mixing process. Therefore, in further charge and discharge tests, the conductivity of the pole piece is significantly improved, and the performance of the battery is significantly improved. In the disclosed method, the solvent is used as the filler of the hollow structure, and no additional impurities and by-products will be introduced. When water is used as the filling agent, the source of water is extensive, the cost is low, and the operation process is simple. Therefore, the pretreatment process is very suitable for industrial production.