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Preparation method of high-rate lithium ion ternary cathode material

A cathode material, lithium ion technology, applied in the field of cathode materials for lithium ion batteries and their preparation, and can solve the problems of low conductivity and the like

Inactive Publication Date: 2019-02-15
HENAN KELONG NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with LiCoO2, the conductivity of ternary materials is relatively low, which greatly challenges the performance of high-current discharge and high-rate performance.

Method used

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  • Preparation method of high-rate lithium ion ternary cathode material
  • Preparation method of high-rate lithium ion ternary cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Select spherical graphite with D50 of 1um and D90 / D10=0.8, place it in a beaker, manually stir for 1min, ultrasonically disperse for 10min, and let it stand for later use. Nickel sulfate, cobalt sulfate and manganese sulfate are made into mixed solution according to Ni:Co:Mn molar ratio is 6:2:2 mixes, and the total number of moles of Ni, Co, Mn three kinds of transition metal ions is 2mol / L, then The NaOH solution of 4mol / L and the transition metal ion solution and the ammoniacal liquor of 4mol / L are added in the intermittent reaction container simultaneously, the feeding rate of control NaOH solution and transition ion solution is respectively 300ml / h and 100ml / h, and the control per unit The power obtained by the volume is 0.3kW / m 3 , the pH value of the reaction system was controlled to be 11.5, and the reaction temperature was 60°C. Then the obtained precipitate was filtered, washed, and dried at 120°C for 12 hours to obtain a precursor with a D50 of 4um and a cor...

Embodiment 2

[0027] Select D50 to be 8um, D90 / D10=0.62 mesophase carbon microspheres, place in a beaker, manually stir for 1min, ultrasonically disperse for 10min, and stand for later use. Nickel sulfate, cobalt sulfate and manganese sulfate are made into a mixed solution according to the Ni:Co:Mn molar ratio of 5:2:3, and the total moles of Ni, Co, and Mn three kinds of transition metal ions are 2.1mol / L, Then the ammoniacal liquor of the NaOH solution of 4mol / L and transition metal ion solution and 4mol / L is joined in the intermittent reaction vessel simultaneously, the feeding rate of control NaOH solution and transition ion solution is respectively 300ml / h and 100ml / h, controls every The power obtained per unit volume is 6kW / m 3 , the pH value of the reaction system was controlled to be 11.2, and the reaction temperature was 65°C. Then filter and wash the obtained precipitate, and dry at 120°C for 12 hours to obtain a D50 precursor with a core-shell structure of 12um, and combine the ...

Embodiment 3

[0029]Select D50 to be 5um, D90 / D10=0.59 carbon balls, place in a beaker, stir manually for 1min, ultrasonically disperse for 10min, and let stand for later use. Nickel sulfate, cobalt sulfate and manganese sulfate are made into a mixed solution according to the Ni:Co:Mn molar ratio of 8:1:1, and the total moles of Ni, Co, and Mn transition metal ions are 2.1mol / L. Then the ammoniacal liquor of the NaOH solution of 4mol / L and transition metal ion solution and 3.6mol / L is joined in the intermittent reaction vessel simultaneously, the feeding rate of control NaOH solution and transition ion solution is respectively 200ml / h and 80ml / h, controls The pH value of the reaction system was 11.7, and the reaction temperature was 65°C. Then the obtained precipitate is filtered, washed, and dried at 120°C for 12 hours to obtain a D50 precursor with a core-shell structure of 12um. The obtained core-shell precursor and lithium carbonate are mixed according to the ratio of M:Li=1:1.08 Propo...

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Abstract

The invention provides a high-power lithium ion cathode material and a preparation method thereof. The cathode material is LiaNixCoyMnzO2 (a is greater than or equal to 0.98 and less than or equal to1.10, x is greater than or equal to 0.4 and less than or equal to 0.95, y is greater than or equal to 0 and less than or equal to 0. 4, z is greater than or equal to 0 and less than or equal to 0.4, and x + y + z is equal to 1. The ternary hollow structural cathode material prepared according to the preparation method disclosed by the invention has a regular shape and narrow particle size distribution, and the structure can enhance the liquid retention ability for non-aqueous electrolyte, can effectively shorten a path of lithium ion transmission, and provides an effective support for high-current discharge and high-rate charge and discharge.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a positive electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] In recent years, with the development of smart phones and portable personal computers, there is a great market demand for small and lightweight secondary batteries with high energy density. At the same time, high-power secondary batteries also have great market demand, especially in transportation equipment such as automobiles and drones. [0003] Lithium-ion secondary batteries can meet the above needs. Since Sony successfully introduced LiCoO2 to the commercial market in the 1990s, lithium-ion batteries have the advantages of high specific capacity, long cycle life, good safety performance, and environmental friendliness. It has been widely used in various mobile terminal devices such as mobile phones and noteb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 文万超程迪尹正中徐云军栗晓静
Owner HENAN KELONG NEW ENERGY CO LTD
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