Preparation method and application of rubidium lithium nickel-cobalt manganate

A technology of rubidium nickel cobalt manganate and rubidium cobalt manganate is applied in the application field of positive electrode materials of lithium ion batteries, which can solve the problems of unsatisfactory doping effect, difficulty in production and practical application, etc., and achieves uniform particles and equipment. The effect of simple, simple reaction conditions

Inactive Publication Date: 2019-05-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the element doping modification methods mentioned above are all doping the polyhedral structural elements in the layer, that is, doping the Ni, Co, and Mn positions, and the doping effect is not id

Method used

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  • Preparation method and application of rubidium lithium nickel-cobalt manganate
  • Preparation method and application of rubidium lithium nickel-cobalt manganate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The target product of this embodiment is Li 0.995 Rb 0.005 Ni 0.8 co 0.1 mn 0.1 o 2 .

[0055] The high-nickel ternary material NCM811 precursor (Ni 0.8 co 0.1 mn 0.1 (OH) 2 ) with LiOH and Rb 2 CO 3 Weighing and mixing according to the stoichiometric ratio to obtain a mixture, in the mixture, in molar ratio, (Li+Rb):(Ni+Co+Mn)=1.045, in the mixture, in molar ratio, Rb:Li=0.005:0.995 .

[0056] The mixture was then mortared for 30 minutes and then transferred to a quartz boat placed in the center of the quartz tube of a tube furnace. Vacuum the quartz tube with O 2 The quartz tube is filled with gas, and the operation is repeated three times. Adjust the gas flow to 200 sccm (standard milliliters per minute). Carry out gradient temperature sintering, first raise the temperature to 450°C for 5 hours at 3°C / min, and then raise the temperature to 860°C at 2°C / min for sintering for 10 hours. After that, it was naturally cooled to room temperature with the fur...

Embodiment 2

[0061] The target product of this embodiment is Li 0.99 Rb 0.01 Ni 0.8 co 0.1 mn 0.1 o 2 .

[0062] The high-nickel ternary material NCM811 precursor (Ni 0.8 co 0.1 mn 0.1 (OH) 2 ) with LiOH and Rb 2 CO 3 Weighing and mixing according to the stoichiometric ratio to obtain a mixture, in the mixture, in molar ratio, (Li+Rb):(Ni+Co+Mn)=1.045:1, in the mixture, in molar ratio, n(Rb): n(Li)=0.01:0.99.

[0063] The mixture was then mortared for 30 minutes and then transferred to a quartz boat placed in the center of the quartz tube of a tube furnace. Vacuum the quartz tube with O 2 The quartz tube is filled with air, and the operation is repeated three times. Adjust the gas flow to 200 sccm (standard milliliters per minute). Carry out gradient temperature sintering, first raise the temperature to 450°C for 5 hours at 3°C / min, and then raise the temperature to 860°C at 2°C / min for sintering for 10 hours. After that, the furnace was naturally cooled to room temperature...

Embodiment 3

[0067] The target product of this embodiment is Li 0.97 Rb 0.03 Ni 0.8 co 0.1 mn 0.1 o 2 .

[0068] The high-nickel ternary material NCM811 precursor (Ni 0.8 co 0.1 mn 0.1 (OH) 2 ) with LiOH and Rb 2 CO 3 Weigh and mix according to the stoichiometric ratio to obtain the mixture, in the mixture, in molar ratio, (Li+Rb):(Ni+Co+Mn)=1.045, in the mixture, in molar ratio, n(Rb):n( Li) = 0.03:0.97.

[0069] The mixture was then mortared for 30 minutes and then transferred to a quartz boat placed in the center of the quartz tube of a tube furnace. Vacuum the quartz tube with O 2 The quartz tube is filled with gas, and the operation is repeated three times. Adjust the gas flow to 200 sccm (standard milliliters per minute). Carry out gradient temperature sintering, first raise the temperature to 450°C for 5 hours at 3°C / min, and then raise the temperature to 860°C at 2°C / min for sintering for 10 hours. After that, the furnace was naturally cooled to room temperature to ...

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Abstract

The invention discloses a preparation method and application of a rubidium lithium nickel-cobalt manganate material. The chemical formula of a rubidium-doped high-nickel ternary positive pole materialis Li1-xRbxNiyCozMn1-y-zO2, wherein y is not less than 0.6, x is more than 0 and not more than 0.1, and z is more than 0 and less than 0.4. The preparation method of the rubidium-doped high-nickel ternary positive pole material comprises the following steps of mixing nickel-cobalt-manganese ternary material precursor, a Li source and a Rb source to acquire a mixture; pre-sintering under the an oxygen atmosphere after grinding, and then sintering at high temperature, thus acquiring the rubidium lithium nickel-cobalt manganate material. The rubidium lithium nickel-cobalt manganate material provided by the invention is uniform in particle, has the micro-nano size and is low in positive ion mixing degree; when the rubidium lithium nickel-cobalt manganate material is applied to the lithium ionbattery, the acquired lithium ion battery is high in specific discharge capacity, high in rate capability, good in cycle performance and long in service life.

Description

technical field [0001] The invention relates to a nickel-cobalt-manganese-rubidium-lithium-lithium material, a preparation method and an application thereof, and belongs to the application field of lithium-ion battery cathode materials. Background technique [0002] Nowadays, lithium-ion batteries (LIBs) are widely used in portable electronic devices due to their high energy density, good cycle performance, and good environmental friendliness, and are developing towards the application field of electric vehicles. However, with the enhancement of the functions of portable electronic appliances and the development of electric vehicles, the energy density, stability and rate performance of lithium-ion batteries are increasingly unable to meet everyone's needs. Therefore, the development of lithium-ion batteries with high energy density, high cycle stability and high rate performance is of great significance to alleviate energy shortages, improve the environment, develop the nat...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 刘军刘咏刘峰祝灵泽
Owner CENT SOUTH UNIV
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