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70results about How to "Inhibition attenuation" patented technology

K ion-doped and high-voltage spinel/carbon double-layer coated lithium-rich anode material and preparation method thereof

ActiveCN106299342AImprove the problem of discharge median voltage decayInhibition transitionCell electrodesSecondary cellsCarbon coatingDouble coating
The invention discloses a K ion-doped and high-voltage spinel/carbon double-layer coated lithium-rich anode material and a preparation method thereof. The lithium-rich anode material comprises a K ion-doped modified core and a high-voltage spinel/carbon double coating layers, wherein the surface of the core is coated with the high-voltage spinel/carbon double coating layers, the core is Li1.2-xKxMn0.6-yNi0.2-yCo2YO2, x is equal to 0.00-0.1, and y is equal to 0.00-0.05; the component of the high-voltage spinel layer in the high-voltage spinel/carbon double coating layers is Li1-xKxMn1.5-yNi0.5-yCo2yO4, x is equal to 0.0-0.2, and y is equal to 0.0-0.1; the carbon coating layer is of a composite structure of dopamine polymer pyrolytic carbon and reduced graphene oxide. The preparation method includes the steps that through a spraying drying technology, the K ion-doped modified core is prepared, the surface of the core is coated with dopamine polymer, coating of graphene oxide is carried out on the basis, and through follow-up sintering, the K ion-doped and high-voltage spinel/carbon double-layer coated lithium-rich anode material is prepared. A modification step is easy to control, and the electrochemical performance of the lithium-rich anode material can be obviously improved.
Owner:CHANGSHA RES INST OF MINING & METALLURGY

Silicon-based composite material for negative active material, negative plate and lithium ion battery

InactiveCN112002883AIncrease profitImprove first-time utilizationGraphiteCell electrodesCarbon nanotubeGraphite
The invention provides a silicon-based composite material for a negative active material, a negative plate and a lithium ion battery. The preparation method comprises the following steps: arranging single-walled carbon nanotubes distributed in a three-dimensional network shape and an optional first conductive agent in a solid electrolyte coating layer; a three-dimensional conductive network can beconstructed on the surfaces of silicon material particles. Due to the establishment of the three-dimensional conductive network, the electron transmission between the silicon material particles and between the silicon material particles and the graphite is enhanced. The smoothness of an electronic channel after silicon expansion is ensured. The electron transmission stability in the circulation process is improved. The utilization rate of silicon is increased, the first utilization rate of the silicon material is increased, the first effect and the battery capacity of a lithium ion battery containing the silicon-based composite material are improved, the SWCNT elasticity is large, the super mechanical property is 100 times that of steel, it is guaranteed that a conductive network is not changed when a silicon negative electrode expands during circulation, circulation attenuation is slowed down, and the circulation performance is improved.
Owner:ZHUHAI COSMX POWER CO LTD

Selenium-doped lithium-rich manganese-based positive electrode material as well as preparation method and application thereof

The invention discloses a selenium-doped lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. In the structure of the selenium-doped lithium-rich manganese-based positive electrode material, selenium in an anionic form is distributed in a lithium-rich manganese-based positive electrode material, the chemical general formula of the positive electrode material is mLi2MnO3-delta Se2 delta/3.(1-m)LiTMO2-deltaSe2delta/3, TM is at least one of Ni, Co and Mn, 0.2 <= m <= 0.8, and the delta is greater than 0 and lower than 2; and the contentof selenium in the positive electrode material is 0-5% in percentage by mass. The positive electrode material has relatively good lattice stability and electrode/electrolyte interface stability, notonly can inhibit lattice oxygen loss in a circulation process, but also can inhibit electrolyte decomposition, relieves the capacity attenuation and the voltage drop of the lithium-rich manganese-based positive electrode material in the circulation process, and effectively overcomes the problems of poor rate capability and the like of existing positive electrode materials. The preparation method is simple and easy to popularize.
Owner:CENT SOUTH UNIV

Manganese-based composite positive electrode material and preparation method therefor

The invention relates to the manufacturing technical field of a battery material, and particularly to a manganese-based composite positive electrode material and a preparation method therefor. Through the matching of a manganese source, a lithium source, a chromium source, a lanthanum source, a binder, a solvent and spinel lithium manganate particles, the spinel lithium manganate particles can be taken as the core; a high-valance lithium-rich phase can be formed in the middle layer and a low-valence Li<2>MnO<2> phase can be formed in the outer layer; consequently, the spinel lithium manganate energy storage part is formed in the interior; the high-valance lithium-rich phase energy storage part is formed in the middle; the Li<2>MnO<2> phase energy storage part is formed in the outer layer; the specific capacity of the positive electrode material is effectively improved; the outer layer of the spinel lithium manganate particles is coated with the low-valance-state material, so that the dissolution of the spinel lithium manganate and the attenuation of the high-valence lithium-rich phase in the middle layer are effectively restrained; and the outer layer is coated with the phase with much lithium, so that the rate of decay of the positive electrode is effectively lowered and the specific capacity of the positive electrode material is improved.
Owner:广西平果润民发展有限公司

Constant current transmitting system for measurement while drilling of electromagnetic wave geosteering tool

The invention provides a constant current transmitting system for measurement while drilling of an electromagnetic wave geosteering tool and belongs to the field of oil exploitation or underground mine exploration or the like. A wireless electromagnetic wave transmitting device is connected with a current detecting unit, the current detecting unit is connected with a current signal feedback unit and a transmitting antenna, and the current signal feedback unit is connected with a current control unit. The current control unit is connected with a power supply device, and the power supply device is connected with the wireless electromagnetic wave transmitting device. The constant current transmitting system can be applied to measurement while drilling of the wireless electromagnetic wave geosteering tool or other working modes with wireless electromagnetic waves used for achieving data transmission between stratums or between ore beds, and working media comprise drilling fluid, clean water, air, nitrogen and the like. A power control method for wireless electromagnetic wave data transmission has the advantages that attenuation on transmission signals by the change of resistivity of stratum and drilling media is well lowered so that the wireless electromagnetic data can be better detected on the ground.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1

Capacitive coupling-type transmitting and receiving circuits for information signal

The invention relates to an electrostatic coupling-type signal transmitting and receiving circuit which transmits and displays data through a non-contact transmission circuit consisting of a display panel substrate, a transmitting substrate and an electrostatic capacitance , wherein the electrostatic capacitance is formed between the transmitting substrate and the display panel substrate. The transmitting substrate comprises a transmission signal processing circuit which converts display data into a voltage signal, and an electrostatic electrode used for transmitting. The display panel substrate comprises an electrostatic electrode used for receiving, an impedance converter circuit and a receiving signal processing circuit. The electrostatic electrode used for transmitting and the electrostatic electrode used for receiving form an electrostatic coupling electrode couple. Insulating components are arranged between the electrostatic coupling electrode couple to form the electrostatic capacitance. The voltage signal is provided for the receiving signal processing circuit via the impedance converter circuit to regenerate the display data and display the display data in a display unit. The electrostatic coupling-type signal transmitting and receiving circuit can prevent the attenuation of a signal on a non-contact transmission path and the change of the voltage on the receiving side when the capacitance is changed, need not modulation and demodulation of the signal, and can realize the non-contact transmission which doesn't depend on the transmission rate.
Owner:JAPAN DISPLAY INC +1

Lithium niobate coated and niobium doped coupled modified high-nickel ternary positive electrode material as well as preparation method and application of lithium niobate coated and niobium doped coupled modified high-nickel ternary positive electrode material

The invention provides a lithium oxide coated and niobium doped coupled modified high-nickel ternary positive electrode material as well as a preparation method and application thereof. The preparation method of the positive electrode material comprises the following steps of: weighing a niobium source and a lithium source according to a theoretical calculation proportion of a molecular formula LiNbO3; respectively dissolving the niobium source and the lithium source in absolute ethyl alcohol to prepare solutions, mixing two solutions, heating the mixed solution, and then adding a high-nickel ternary material; continuously heating the mixed solution until the absolute ethyl alcohol in the mixed solution is evaporated to dryness to obtain a precursor; and grinding the precursor, and calcining the precursor step by step to obtain the lithium niobate coated and niobium doped coupled modified high-nickel ternary positive electrode material. The positive electrode material disclosed by the invention not only can inhibit side reaction between an electrolyte and an interface in a circulating process, but also can inhibit phase change in the circulating process, so that the circulating stability and the structural stability can be enhanced, and the problems of poor rate capability, poor circulating stability, crack generation and the like in the existing positive electrode material can be effectively solved.
Owner:CENT SOUTH UNIV
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