High-specific-capacity lithium nickel-cobalt-manganese cathode material and a preparation method thereof

A technology of nickel cobalt lithium manganate and cathode material, which is applied in the field of high specific capacity nickel cobalt lithium manganate cathode material and its preparation, can solve the problems of secondary particle cracks, cation mixing, poor thermal stability, etc., and achieves crack suppression. , low cost, and the effect of improving structural stability

Inactive Publication Date: 2019-08-09
西安翱宇科技管理咨询合伙企业(有限合伙)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-nickel ternary materials also face the following problems in use: the stress generated by long-term cycles is easy to cause cracks inside the secondary particles, mixed cations, poor thermal stability, and severe self-discharge at high temperatures and charging states, etc.

Method used

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  • High-specific-capacity lithium nickel-cobalt-manganese cathode material and a preparation method thereof
  • High-specific-capacity lithium nickel-cobalt-manganese cathode material and a preparation method thereof
  • High-specific-capacity lithium nickel-cobalt-manganese cathode material and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1: Configure metal sulfate solution, nickel sulfate concentration is 1.6mol / L, cobalt sulfate concentration is 0.2mol / L, manganese sulfate concentration is 0.2mol / L, aluminum sulfate concentration is 0.002mol / L;

[0039] Step 2: Prepare 20% NaOH solution and 10% ammonia solution;

[0040] Step 3: Add sodium hydroxide solution and ammonia solution to the metal solution, adjust the pH to 11, so that NH 4 The concentration of OH and metal ions are equal;

[0041] Step 4: Stir the mixed solution prepared in step 3 at 45°C and 600 rpm for 8 hours, wash after the reaction, filter with suction and dry at 60°C with air as the drying atmosphere to obtain a precursor of nickel-cobalt-manganese hydroxide doped with aluminum body;

[0042] Step 5: Mix the precursor obtained in Step 4 with lithium hydroxide, diboron trioxide, and silicon dioxide by ball milling, and the molar ratio of each component is 1:1.05:0.02:0.01;

[0043] Step 6: The mixture obtained in step 5 is heated to 480°C ...

Embodiment 2

[0054] Step 1: Configure metal sulfate solution, nickel sulfate concentration is 1.6mol / L, cobalt sulfate concentration is 0.2mol / L, manganese sulfate concentration is 0.2mol / L, aluminum sulfate concentration is 0.04mol / L;

[0055] Step 2: Prepare 10% NaOH solution and 5% ammonia solution;

[0056] Step 3: Add sodium hydroxide solution and ammonia solution to the metal solution to adjust the pH to 9;

[0057] Step 4: Stir the mixed solution prepared in step 3 at 1000 rpm at 40°C for 6 hours, wash, filter and dry after the reaction to obtain a nickel cobalt manganese hydroxide precursor containing doped aluminum;

[0058] Step 5: Mix the precursor obtained in Step 4 with lithium hydroxide, diboron trioxide, and silicon dioxide by ball milling, and the molar ratio of each component is 1:1.05:0.001:0.02;

[0059] Step 6: Heat the mixture obtained in step 5 to 520°C in an air or oxygen atmosphere, keep it for 8 hours, then heat to 900°C, keep it for 10 hours, at a temperature increase rate ...

Embodiment 3

[0061] Step 1: Configure metal sulfate solution, nickel sulfate concentration is 1.2mol / L, cobalt sulfate concentration is 0.4mol / L, manganese sulfate concentration is 0.4mol / L, aluminum sulfate concentration is 0.02mol / L;

[0062] Step 2: Prepare 15% NaOH solution and 8% ammonia solution;

[0063] Step 3: Add sodium hydroxide solution and ammonia solution to the metal solution to adjust the pH to 10;

[0064] Step 4: Stir the mixed solution prepared in step 3 at 40° C. and 800 rpm for 10 hours, wash, filter and dry after the reaction to obtain a nickel cobalt manganese hydroxide precursor containing doped aluminum;

[0065] Step 5: Mix the precursor obtained in step 4 with lithium hydroxide, diboron trioxide, and silica ball milling thoroughly, and the molar ratio of each component is 1:1.05:0.01:0.015;

[0066] Step 6: The mixture obtained in step 5 is heated to 500°C under an air or oxygen atmosphere, kept for 7 hours, and then heated to 850°C, kept for 15 hours, at a temperature inc...

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Abstract

The invention relates to a high-specific-capacity lithium nickel-cobalt-manganese cathode material and a preparation method thereof. The materials comprise a precursor, an aluminum doped body, a borondoping body, a coating body and a lithium source. The precursor comprises the following components: 50-90% of nickel sulfate, 5-30% of manganese sulfate and 5-30% of cobaltous sulfate. The method comprises the steps of: preparing a metal sulfate solution, and uniformly mixing the nickel sulfate, the cobaltous sulfate, the manganese sulfate and the aluminum sulfate; preparing 10-20% of sodium hydroxide solution and 5-10% of ammonia-water solution, adding the sodium hydroxide solution and the ammonia-water solution into the metal sulfate solution, regulating the pH of the solution to obtain a mixed solution; heating and stirring the mixed solution to obtain a precipitate, and performing washing, extraction filtration and drying of the precipitate to obtain an aluminum doped Ni-Co-Mn hydroxide precursor; performing ball-milling and full mixing of the precursor with the lithium hydrate, the diboron trioxide and the silicon dioxide to obtain a mixture; and sintering the mixture to obtain alithium nickel-cobalt-manganese cathode material. The cycle performance of the lithium manganate battery can be effectively improved, the self-discharge phenomenon is inhibited, the operation is simple, the cost is low, and the industrialization is easy to achieve.

Description

Technical field [0001] The invention belongs to the field of positive electrode materials for power batteries, and specifically relates to a high-specific capacity lithium nickel cobalt manganese oxide positive electrode material and a preparation method thereof. Background technique [0002] With the rapid development of electric vehicles, insufficient cruising range has gradually become an important factor restricting the popularization of pure electric vehicles. Among them, the energy density of the power battery is the key that directly affects the range of electric vehicles. In the current power battery cathode material system, layered ternary materials (NCM, NCA, etc.) have great advantages in energy density (>200Whkg-1) compared to lithium manganate and lithium iron phosphate, so they have gradually become the mainstream Cathode material. In the current ternary material system, according to the active element nickel content, it can be divided into low nickel ternary m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 马越
Owner 西安翱宇科技管理咨询合伙企业(有限合伙)
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