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Ultrahigh nickel single crystal positive electrode material, preparation method and application

A positive electrode material and single crystal technology, applied in the field of lithium-ion power batteries for new energy vehicles, can solve the problems of low capacity and poor cycle performance of ultra-high nickel single crystal positive electrode materials, and achieve improved battery life and safety performance, layered Stable structure and less agglomeration-like states

Inactive Publication Date: 2021-02-02
ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the problem of low capacity and poor cycle performance of the ultra-high nickel single crystal positive electrode material in the prior art

Method used

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  • Ultrahigh nickel single crystal positive electrode material, preparation method and application
  • Ultrahigh nickel single crystal positive electrode material, preparation method and application
  • Ultrahigh nickel single crystal positive electrode material, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of ultra-high nickel single crystal cathode material:

[0043] S1. Put Ni 0.90 co 0.05 mn 0.05 (OH) 2 The ternary precursor is mixed with battery-grade lithium hydroxide monohydrate at a molar ratio of lithium to metal of 1.08:1, and 0.5% Al(OH) containing cobalt-nickel ternary precursor is added 3 and 0.3% ZrO by mass of cobalt-nickel ternary precursor 2 , and then calcined at 790 ° C for 15 hours in an oxygen atmosphere to obtain a primary calcined material; wherein the median particle size D of the ternary precursor 50 3.20μm, the specific surface area is 7.5m 2 / g, bulk density is 1.12g / cm 3 , the tap density is 1.95g / cm 3 ;

[0044] S2. Perform coarse crushing and fine crushing on the primary calcined material, wherein the coarse crushing is crushed by the jaw crusher, and the gap between the rollers is 0.15 mm; the fine crushing parameters are the induced air frequency of 28 Hz, and the classification frequency of 120 Hz;

[0045] S3. The prim...

Embodiment 2

[0048] Preparation of ultra-high nickel single crystal cathode material:

[0049] S1. Put Ni 0.92 co 0.04 mn 0.04 (OH) 2 The ternary precursor is mixed with battery-grade lithium hydroxide monohydrate at a molar ratio of lithium to metal of 1.03:1, and 0.25% Ti(OH) containing cobalt-nickel ternary precursor is added 4 and 0.6% SiO by mass of cobalt-nickel ternary precursor 2 , and then calcined at 770 ° C for 12 hours in an oxygen atmosphere to obtain a primary calcined material; wherein the median particle size D of the ternary precursor contains 50 3.05μm, the specific surface area is 13.5m 2 / g, bulk density is 1.08g / cm 3 , the tap density is 1.87g / cm 3 ;

[0050] S2. The primary calcined material is subjected to coarse crushing and fine crushing, wherein the coarse crushing is crushed by the jaw crusher, and the gap between the rollers is 0.10 mm; the fine crushing parameters are 35 Hz of induced wind frequency and 150 Hz of classification frequency.

[0051] S3. ...

Embodiment 3

[0054] Preparation of ultra-high nickel single crystal cathode material:

[0055] S1. Put Ni 0.88 co 0.09 mn 0.03 (OH) 2 The ternary precursor is mixed with battery-grade lithium hydroxide monohydrate at a molar ratio of lithium to metal of 1.06:1, and 0.07% Sr(OH) containing cobalt-nickel ternary precursor is added 2 and 0.30% Nb by mass of cobalt-nickel ternary precursor 2 o 5 , and then calcined at 810°C for 8 hours in an oxygen atmosphere to obtain a primary calcined material; wherein the median particle size D of the ternary precursor contains 50 3.50μm, the specific surface area is 7.0m 2 / g, bulk density is 1.08g / cm 3 , the tap density is 1.85g / cm 3 ;

[0056] S2. The primary calcined material is subjected to coarse crushing and fine crushing, wherein the coarse crushing is crushed by the jaw crusher, and the gap between the rollers is 0.25 mm; the fine crushing parameters are 5 Hz of induced wind frequency and 100 Hz of classification frequency.

[0057] S3. ...

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Abstract

The invention discloses a preparation method of an ultrahigh nickel single crystal positive electrode material, which comprises the following steps of S1, mixing a ternary precursor and lithium hydroxide according to a lithium-metal molar ratio of 1.01-1.10: 1, adding a doping agent, and calcining in an oxygen atmosphere to obtain a primary calcined material, S2, performing coarse crushing, fine crushing, sieving and demagnetizing on the primary calcined material to obtain a crushed material, S3, adding the crushed material and water into a reaction kettle according to a water-material ratio of 0.5: 1-5: 1, controlling the temperature of the reaction kettle, adding a reagent for reaction, and drying after the reaction is finished to obtain a mixed material, and S4, mixing the mixture witha modified coating agent, placing the mixture in an atmosphere furnace for secondary calcination, and then performing coarse crushing, fine crushing, sieving and demagnetizing to obtain the ternary positive electrode material. The ultrahigh nickel single crystal is subjected to optimization treatment by different calcining processes and is coated and modified by the modified coating agent, so thatthe obtained single crystal positive electrode material has the characteristics of extremely low residual alkali level and less single crystal particle agglomeration state, and the soft package battery assembled by the single crystal material has the characteristics of good thermal stability, low gas expansion rate and excellent cycle performance; compared with a conventional high-nickel secondary ball with the same nickel content, the material has obvious performance advantages.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion power batteries for new energy vehicles, and in particular relates to an ultra-high nickel single crystal positive electrode material, a preparation method and an application. Background technique [0002] With the development of society and the emphasis on environmental protection, the new energy vehicle market has developed rapidly in recent years. At the same time, people have higher and higher requirements for the mileage and safety performance of electric vehicles. Under the existing system, increasing the cruising range is mainly achieved by increasing the nickel content in the ternary material to bring higher specific capacity or increasing the charging voltage, but these methods will also lead to significant cycle performance and safety performance of the positive electrode material while increasing the capacity of the positive electrode material. decrease. [0003] At present, the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525C30B29/22C30B1/10C01G53/00
CPCC01G53/42C01G53/44C01P2002/72C01P2004/03C30B1/10C30B29/22H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 张中彩王鑫吕玉辰邱永华毛秦钟吉同棕王寅峰钱志挺吴海军
Owner ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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