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2775results about How to "Inhibit side effects" patented technology

Positive electrode active material and its manufacturing method, positive electrode for lithium secondary cell using same, and lithium secondary cell

A positive active material is provided which can inhibit side reactions between the positive electrode and an electrolyte even at a high potential and which, when applied to a battery, can improve charge/discharge cycle performance without impairing battery performances even in storage in a charged state. Also provided are: a process for producing the active material; a positive electrode for lithium secondary batteries which employs the active material; and a lithium secondary battery which has improved charge/discharge cycle performance while retaining intact battery performances even after storage in a charged state and which can exhibit excellent charge/discharge cycle performance even when used at a high upper-limit voltage. The positive active material comprises: base particles able to dope and release lithium ions; and an element in Group 3 of the periodic table present on at least part of that part of the base particles which is able to come into contact with an electrolyte. It is produced by, e.g., a process which comprises: producing base particles containing lithium and able to dope and release lithium ions; and then imparting an element in Group 3 of the periodic table to the base particles so that the element can be present on at least part of that part of the base particles which is able to come into contact with an electrolyte.
Owner:GS YUASA INT LTD

Preparation method and application of acrylate heterozygotic emulsion

The invention discloses a preparation method and an application of an acrylate heterozygotic emulsion. In the invention, the acrylate heterozygotic emulsion is synthesized by adopting a seed emulsion polymerization process and combining a process of instantly neutralizing and segmentally adding polar monomers. The acrylate heterozygotic emulsion comprises macroparticles consisting of polymers P2 rich in hydroxyl groups on a surface layer and microparticles consisting of polymers P1 rich in carboxylate on the surface layer. Compared with a conventional hydroxy acrylate emulsion, the acrylate heterozygotic emulsion has smaller mean grain size and wider grain size distribution on emulsion particles. The acrylate heterozygotic emulsion can be adopted to prepare aqueous bi-component polyurethane wood coatings, and a coating layer of the coating has excellent property of resisting water and solvents, high crosslinking density and hardness, good mechanical property, scratching resistance and wear resistance. The acrylate heterozygotic emulsion has compact coating structure, high glossiness and better combination property, and not only can be applied to high-grade wood coatings, but also can be applied to automotive refinish paint, metallic anti-corrosion paint, other industrial protective paint, and the like.
Owner:SOUTH CHINA UNIV OF TECH

Catalyst for normal paraffin hydroisomerization reaction and preparation method as well as application thereof

The invention relates to a catalyst for a normal paraffin hydroisomerization reaction and a preparation method as well as an application thereof. The catalyst has the characteristics that the activity is high in an n-hexane hydroisomerization reaction, and the selectivity and stability are good for a double-branched-chain product. The catalyst comprises modified zeolite molecular sieve ZSM-12 treated by alkaline solution and noble metal of family VIII, wherein the zeolite molecular sieve ZSM-12 adopts zeolite molecular sieve ZSM-12 containing organic amine template. The preparation method of the catalyst comprises the following steps of: desilication of zeolite molecular sieve ZSM-12 containing template after being treated with alkaline solution to obtain zeolite molecular sieve ZSM-12 with high content of mesoporous, and preparing isomerized catalyst by loading Pt. The catalyst is applied in the normal paraffin hydroisomerization reaction, when the catalyst is applied, the n-hexane hydroisomerization reaction is carried out on a fixed bed miniature reactor, the reacting raw material n-hexane is fed into the reactor by a force pump, and is contacted with the catalyst to react in the reactor after being mixed with hydrogen in a mixer.
Owner:ZHEJIANG NORMAL UNIVERSITY

Doped monocrystal multi-component material for lithium ion batteries and preparation method of such doped monocrystal multi-component material

The invention belongs to the technical field of anode materials for lithium ion batteries and particularly discloses a doped monocrystal multi-component material for lithium ion batteries and a preparation method of such doped monocrystal multi-component material. The doped monocrystal multi-component material and the preparation method thereof have the advantages that nickel-cobalt-manganese ternary materials are modified, and M-source metals are doped when a precursor is prepared to decrease the material sintering temperature and improve material tapping density, so that the mixed arrangement degree of Ni<2+> in a Li<+> layer is weakened obviously; through high-temperature sintering and tempering processes, the precursor of the multi-composite material, prepared through a coprecipitation method, is more stable in crystal structure, metal ions in the material are inhibited from dissolving through surface coating, side reaction between the metal ions and electrolyte is inhibited, and stability and electrochemical performance of an active material are further enhanced; a doped monocrystal multi-component material finished product is stable in crystal structure, high in safety and compaction density and excellent in rate capability and cycle performance, so that specific capacity and charge-discharge voltage of the material are further enhanced; the preparation method is small in doping quantity, simple to operate, easy to control, widely applicable and suitable for large-scale production.
Owner:烟台卓能锂电池有限公司

Surface coating method of 5V lithium ion battery positive pole material LiNi0.5-xMn1.5MxO4

The invention discloses a surface coating method of a 5V lithium ion battery positive pole material LiNi0.5-xMn1.5MxO4, which comprises the following steps: (1) grinding and mixing a coating material or precursor thereof and a positive pole active material in a mass ratio of (1-50):100; (2) dispersing the mixture in a certain liquid-phase medium, and carrying out ultrasonic pulverization; (3) mixing the mixture and the medium by ball milling; (4) filtering and drying; and (5) putting the dried mixture in the step (4) into a pipe furnace, heating in inert gas at the heating speed of 1-30 DEG C / minute, calcining at the constant temperature of 200-500 DEG C for 1-5 hours, carrying out quick cooling or furnace cooling to room temperature, and grinding the coated high-voltage lithium ion battery positive pole material LiNi0.5-xMn1.5MxO4. The product obtained by the method disclosed by the invention has high reversible specific capacity: the capacity retentivity after 500 2C charging / discharging cycles is higher than 95%, and the specific capacity of 5C discharge is more than 96% of 0.2C. The method has the advantages of simple and controllable synthesis technique and uniform coating, and is suitable for industrial production.
Owner:HEFEI GUOXUAN HIGH TECH POWER ENERGY
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