Preparation method of nickel cobalt lithium manganate composite anode material

A composite positive electrode material, nickel-cobalt-lithium manganese oxide technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of increasing safety hazards, unfavorable cycle performance and safety performance, increasing the cost of ternary material preparation, etc., to achieve improvement Effects of cycle performance, improvement of bulk density, and improvement of safety performance

Inactive Publication Date: 2014-01-01
CHINA NAT OFFSHORE OIL CORP +2
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Problems solved by technology

Such as Chinese patent CN102891310A disclosed titanium-silicon-carbon-modified lithium-ion battery ternary positive electrode material and its preparation method is by adopting alcohol suspension method in LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Adding highly conductive Ti to the matrix 3 SiC 2 , this technology mainly improves the conductivity of ternary materials, but this technology uses alcohol in the preparation, which increases the preparation cost of ternary materials, and also increases the safety hazard in production
Chinese patent CN101707252B discloses a polycrystalline nickel-cobalt-manganese ternary positive electrode material and its preparation method. The preparation method mainly adopts high-temperature fusion to prepare polycrystalline cobalt-nickel-manganese ternary positive electrode material, but does not introduce any The binding agent of the polycrystalline material cannot guarantee the fusion effect of the polycrystalline material, and there is no coating layer on the surface of the material, which cannot block the reaction between the material and the electrolyte, which is not conducive to improving the cycle performance and safety performance of the material

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  • Preparation method of nickel cobalt lithium manganate composite anode material
  • Preparation method of nickel cobalt lithium manganate composite anode material
  • Preparation method of nickel cobalt lithium manganate composite anode material

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Effect test

Embodiment 1

[0016] Take 90g of prepared nickel-cobalt lithium manganese oxide doped with metal ions as the matrix, take 10g of fine powder produced in the production process of lithium manganate as the coating material, take 0.5g of boric acid as the binder, and use a horizontal ball mill to mix evenly to get the mixture. The mixture was put into a muffle furnace and sintered in an air atmosphere. The temperature was raised to 600°C for 3 hours, then the temperature was raised to 900°C for 2 hours, and then cooled naturally. A universal pulverizer is used to pulverize and sieve the material to obtain a nickel-cobalt-lithium manganate composite cathode material.

[0017] The material X-ray diffraction pattern that present embodiment obtains, as figure 1 As shown, it can be seen from the characteristic peaks of the X-ray diffraction pattern that the nickel-cobalt-lithium-manganese-oxide composite positive electrode material is a symbiotic state of two lattice structures.

[0018] The mate...

Embodiment 2

[0021] Take the prepared 1800g of nickel-cobalt lithium manganese oxide as the substrate, take 20g of the fine powder produced in the production process of lithium manganate as the coating material, take 60g of barium oxide as the binder, and use a high-speed mixer to mix evenly to obtain a mixture. The mixture was put into a muffle furnace and sintered in an oxygen atmosphere. The temperature was raised to 700°C for 10 hours at a constant temperature, and then the temperature was raised to 1000°C for 10 hours at a constant temperature, and then cooled naturally. A horizontal ball mill is used to pulverize and sieve the material to obtain a nickel-cobalt-lithium manganate composite cathode material.

Embodiment 3

[0023] Take the prepared 700g of nickel-cobalt lithium manganate doped with metal ions as the substrate, take the fine powder produced in the production process of 300g of lithium manganate as the coating material, take 20g of lithium dihydrogen phosphate and 30g of tungsten oxide as the binding agent, Use a horizontal ball mill to mix evenly to obtain a mixture. The mixture was put into a muffle furnace and sintered in an oxygen atmosphere. The temperature was raised to 350°C for 18 hours, then the temperature was raised to 800°C for 20 hours, and then cooled naturally. A universal pulverizer is used to pulverize and sieve the material to obtain a nickel-cobalt-lithium manganate composite cathode material.

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Abstract

The invention discloses a preparation method of a nickel cobalt lithium manganate composite anode material. The preparation method is characterized by comprising the following steps: 1), with the nickel cobalt lithium manganate or the nickel cobalt lithium manganate doped with metal ions as a substrate and the lithium manganate fine powder as a coating material, uniformly mixing the nickel cobalt lithium manganate substrate or the nickel cobalt lithium manganate substrate doped with metal ions, the lithium manganate fine powder and a bonding agent in weight percentage, wherein the additive amount of the lithium manganate fine powder is 0.1% to 40% of the composite anode material in percentage by weight, and the additive amount of the bonding agent is 0.1% to 5% of the composite anode material in percentage by weight; and 2), putting a mixture obtained in the step 1) into a reacting furnace, performing sectional sintering in air or oxygen atmosphere, heating to 300-700 DEG C firstly, processing for 1-20 hours at the constant temperature, and then heating to 800-1000 DEG C, and processing for 1-20 hours at the constant temperature, cooling naturally, and processing the powder, so as to obtain the nickel cobalt lithium manganate composite anode material.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium-ion power batteries, in particular to a preparation method of a nickel-cobalt lithium manganate composite positive electrode material. Background technique [0002] At present, a large number of positive electrode materials used in power batteries on the market are mainly lithium iron phosphate and lithium manganese oxide. Due to the excellent safety performance of lithium iron phosphate, it is the preferred positive electrode material for power batteries such as electric buses; lithium manganese oxide has the advantages of good rate performance in addition to good safety performance, and is mainly used in electric bicycles and small electric tools. battery. With the development of power batteries used in electric vehicles, due to the low energy density of lithium iron phosphate and lithium manganese oxide, they cannot meet their requirements. The nickel-cobalt li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/505H01M4/525Y02E60/10
Inventor 陈威叶学海刘红光夏继平张晓波于晓微付春明
Owner CHINA NAT OFFSHORE OIL CORP
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