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MOF-coated single crystal ternary positive electrode material and preparation method of precursor of MOF-coated single crystal ternary positive electrode material

A cathode material and precursor technology, which is applied in the field of preparation of single crystal ternary cathode material precursors, can solve the problems of incompatibility of specific capacity, cycle life, and safety, and achieve shortened migration path, improved rate performance, and uniform mixing Effect

Active Publication Date: 2020-05-08
GEM CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems in the prior art, the present invention provides a method for preparing a MOF-coated single crystal ternary positive electrode material precursor, which solves the problem of using high nickel in the prior art to obtain higher specific capacity, cycle life, and safety. incompatible problem

Method used

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  • MOF-coated single crystal ternary positive electrode material and preparation method of precursor of MOF-coated single crystal ternary positive electrode material
  • MOF-coated single crystal ternary positive electrode material and preparation method of precursor of MOF-coated single crystal ternary positive electrode material
  • MOF-coated single crystal ternary positive electrode material and preparation method of precursor of MOF-coated single crystal ternary positive electrode material

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Embodiment 1

[0031] Step 1, the nickel-cobalt-manganese salt solution (metal concentration is 2mol / L) that metal molar ratio is 82:8:10 joins in the reaction kettle with the flow rate of 6L / h with metering pump, simultaneously adds 12g / The ammonia water of 1 L and the sodium hydroxide of 3mol / L, the flow rate is 1L / h and 2.5L / h respectively, and the pH of the system is maintained between 10.5-12.0 by controlling the flow rate of ammonia water and sodium hydroxide during the reaction. Nitrogen gas was passed into the sealed reaction kettle with a flow rate of 2 L / h. The stirring speed of the stirring blade is 400 r / min, and the reaction temperature of the system is 62°C. During the reaction, use a laser particle size analyzer to detect the particle size of the particles in the reactor every hour. By observing the morphology of the primary particles and secondary particles of the process sample, the primary particles are controlled to be spherical particles that are evenly agglomerated in t...

Embodiment 2

[0035] Step 1, the nickel-cobalt-manganese salt solution (metal concentration is 2mol / L) that metal molar ratio is 75:13:12 joins in the reactor with the flow rate of 6L / h with metering pump, simultaneously adds 12g / The ammonia water of 1 L and the sodium hydroxide of 3mol / L, the flow rate is 1L / h and 2.5L / h respectively, and the pH of the system is maintained between 10.5-12.0 by controlling the flow rate of ammonia water and sodium hydroxide during the reaction. Nitrogen gas was passed into the sealed reaction kettle with a flow rate of 2 L / h. The stirring speed of the stirring blade is 400 r / min, and the reaction temperature of the system is 62°C. During the reaction, use a laser particle size analyzer to detect the particle size of the particles in the reactor every hour. By observing the morphology of the primary particles and secondary particles of the process sample, the primary particles are controlled to be spherical particles that are evenly agglomerated in the form...

Embodiment 3

[0039] Step 1, the nickel-cobalt-manganese salt solution (metal concentration is 2mol / L) that metal molar ratio is 90:5:5 joins in the reaction kettle with the flow rate of 6L / h with metering pump, simultaneously adds 12g / The ammonia water of 1 L and the sodium hydroxide of 3mol / L, the flow rate is 1L / h and 2.5L / h respectively, and the pH of the system is maintained between 10.5-12.0 by controlling the flow rate of ammonia water and sodium hydroxide during the reaction. Nitrogen gas was passed into the sealed reaction kettle with a flow rate of 2 L / h. The stirring speed of the stirring blade is 400 r / min, and the reaction temperature of the system is 62°C. During the reaction, use a laser particle size analyzer to detect the particle size of the particles in the reactor every hour. By observing the morphology of the primary particles and secondary particles of the process sample, the primary particles are controlled to be spherical particles that are evenly agglomerated in th...

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Abstract

The invention discloses an MOF-coated single crystal ternary positive electrode material and a preparation method of a precursor of the MOF-coated single crystal ternary positive electrode material. The preparation method comprises: firstly, preparing a solution A of nickel-cobalt-manganese metal salt according to a molar ratio, and preparing an ammonia water complexing agent solution and liquid caustic soda; then adding the solution A, an ammonia water complexing agent solution and liquid caustic soda into a reaction kettle for reaction to obtain a precursor inner core; dissolving organic carboxylate in an organic solvent to obtain a solution B; adding the solution B and a manganese metal salt solution into the reaction kettle for reaction, and aging to obtain an MOF-coated core-shell structure precursor; carrying out low-temperature presintering on the precursor with the core-shell structure to obtain a nickel-cobalt-manganese oxide with a single crystal structure; and uniformly mixing the nickel-cobalt-manganese oxide with the single crystal structure with lithium hydroxide monohydrate in a mortar, and carrying out high-temperature calcination to obtain the MOF-coated single crystal ternary positive electrode material. According to the invention, the problems of poor cycle and thermal stability caused by high nickel are overcome, and the obtained positive electrode materialhas the electrochemical properties of high multiplying power, high capacity and high cycle performance.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and relates to a method for preparing a cathode material of a lithium battery, in particular to a method for preparing a MOF-coated single crystal ternary cathode material precursor. Background technique [0002] With the rapid development of society, new energy power battery vehicles have gradually entered people's lives, and it is expected that in 2020, new energy power battery vehicles will become the mainstream, which requires power batteries to have high capacity, thermal stability and cycle stability. Lithium-ion batteries have occupied a very important position in the energy storage market due to their advantages of high capacity. Ternary materials combine the advantages of three materials through the synergistic effect of Ni-Co-Mn: LiCoO 2 With good cycle performance, LiNiO 2 With high specific capacity and LiMnO 2 With the advantages of high safety and low cost, it has become one of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/052C01G53/00
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/052C01G53/006C01G53/44Y02E60/10C01P2004/61C01P2004/32C01P2004/84C01G53/50C01G53/40H01M2004/028C01G45/1214C01G51/44C01P2006/40H01M10/0525H01M2220/20
Inventor 许开华蒋振康张坤薛晓斐李聪孙海波陈康黎俊范亮姣
Owner GEM CO LTD
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