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Doped lithium nickel cobalt oxide composite cathode material and preparation method thereof

A composite cathode material, lithium nickel cobalt oxide technology, applied in battery electrodes, electrical components, electrochemical generators and other directions, can solve problems such as restricting the development of high energy density power batteries

Inactive Publication Date: 2016-10-26
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, with the increasing demand for the energy density and performance of single cells, doped lithium nickel cobalt oxide needs to be further improved in terms of cycle stability and safety. The existing doped lithium nickel cobalt oxide materials Has become a bottleneck restricting the development of high energy density power batteries

Method used

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  • Doped lithium nickel cobalt oxide composite cathode material and preparation method thereof
  • Doped lithium nickel cobalt oxide composite cathode material and preparation method thereof
  • Doped lithium nickel cobalt oxide composite cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1.83kg doped lithium nickel cobalt oxide precursor Ni 0.8 co 0.15 al 0.05 (OH) 2 Add in the reaction kettle that 1mol / L manganese sulfate solution is housed, stir constantly, stirring speed is 500rpm, add the mixed solution of the sodium hydroxide of 0.5mol / L and ammoniacal liquor in the reaction kettle with 30mL / min through metering pump, molar The ratio of ammonia water to sodium hydroxide is 1:20. After the precipitant is added, Mn:NaOH=1:2 by mole in the reaction kettle. After the precipitation is complete, let it stand for 1 hour, filter and collect the solid, and pass the solid through deionized water. Wash and tumble dry. Then mix the dried solid and lithium hydroxide in a high-speed mixer for 60 minutes at a molar ratio of 1:1, then bake at 800°C for 15 hours at a high temperature, cool to room temperature, grind and sieve to obtain surface coating Nickel oxide cobalt aluminum lithium composite positive electrode material with spinel lithium manganese oxide ...

Embodiment 2

[0033] 2.01kg doped lithium nickel cobalt oxide precursor Ni 0.8 co 0.1 mn 0.10 (OH) 2Add in the reaction kettle that 1mol / L manganese sulfate solution is housed, stir constantly, stirring speed is 500rpm, add the mixed solution of 0.5mol / L sodium hydroxide and ammoniacal liquor to the reaction kettle with 30mL / min through metering pump, by mole The ratio of ammonia water to sodium hydroxide is 1:20. After the precipitant is added, Mn:NaOH=1:2 by mole in the reactor. After the precipitation is complete, let it stand for 1 hour, filter and collect the solid, and wash the solid with deionized water ,drying. Then mix the dried solid and lithium hydroxide in a high-speed mixer for 60 minutes at a molar ratio of 1:1, then bake at 800°C for 15 hours at a high temperature, cool to room temperature, grind and sieve to obtain surface coating Nickel oxide cobalt manganese lithium composite cathode material with spinel lithium manganese oxide layer.

Embodiment 3

[0035] 1.01kg doped lithium nickel cobalt oxide precursor Ni 0.8 co 0.15 Al 0.05 (OH) 2 Add in the reaction kettle that 1mol / L manganese sulfate solution is housed, stir constantly, stirring speed is 500rpm, add the mixed solution of 0.5mol / L sodium hydroxide and ammoniacal liquor to the reaction kettle with 30mL / min through metering pump, by mole The ratio of ammonia water to sodium hydroxide is 1:20. After the precipitant is added, Mn:NaOH=1:2 by mole in the reactor. After the precipitation is complete, let it stand for 1 hour, filter and collect the solid, and wash the solid with deionized water ,drying. Then mix the dried solid and lithium hydroxide in a high-speed mixer for 60 minutes at a molar ratio of 1:1, then bake at 800°C for 15 hours at a high temperature, cool to room temperature, grind and sieve to obtain surface coating Nickel oxide cobalt aluminum lithium composite positive electrode material with spinel lithium manganese oxide layer.

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Abstract

The invention discloses a doped lithium nickel cobalt oxide composite cathode material and a preparation method thereof. The preparation method comprises the following steps: (1), dissolving manganese ion raw materials in water to prepare a solution A, and dissolving a precipitator in the water to prepare a solution B; (2), adding a doped lithium nickel cobalt oxide precursor in the solution A, and adding the solution B to the solution A while stirring; after reaction is completed, filtering the mixed solution, collecting solid matters, and cleaning and drying the solid matters, thereby obtaining solids A; and (3), putting the solids A and a lithium source in an oxygen atmosphere furnace to perform high-temperature roasting, thereby obtaining products after the roasting, namely the doped lithium nickel cobalt oxide composite cathode material existing in a core-shell structure, the surface of which is coated with a spinel lithium manganate layer. According to the preparation method, a layer of spinel lithium manganate cathode material is coated on the surface of the lithium nickel cobalt oxide, so that the efficiency and the cycle life of a battery cell in use can be improved; outmost-layer spinel isolates metallic nickel from directly contacting with electrolyte, so that the stability and the safety of the battery can be effectively improved.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material for a lithium ion battery, in particular to a doped nickel-cobalt lithium composite positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a secondary battery with high energy density, high power density and long cycle life. With the reduction of fossil energy and serious environmental pollution, it is gradually playing an irreplaceable role in modern society. With the rapid development of industries such as electric vehicles and smart grids, the demand for lithium-ion power batteries has risen sharply. At the same time, in the national 13th Five-Year Plan, new energy vehicles require that the energy density of a single battery is greater than 300Wh / kg, and the cycle life is greater than 2000 times. This requires lithium-ion power batteries to have the characteristics of high energy density, good cycle stability, a...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/362H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 吴孟涛徐宁张彬吕菲
Owner TIANJIN B&M SCI & TECH
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