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Modified single-crystal ternary positive electrode material and preparation method thereof

A cathode material and modification technology, applied in the field of modified single crystal ternary cathode materials and their preparation, can solve the problems of complex preparation of oxides or salt solutions, inability to form continuous surfaces, uneven surface of materials, etc., and achieve easy testing. , The effect of small kinetic energy and uniform size distribution

Active Publication Date: 2021-10-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above modification method, although wet modification can reduce the residual alkali of the material in the process of water washing or solution washing and coating, it will cause Li + Precipitation and preparation of oxides or salt solutions are complicated, and the further sewage generated will increase the production cost invisibly
The oxides used in dry doping and coating modification such as tantalum pentoxide (Ta 2 o 5 ), tungsten oxide (WO 3 ), lanthanum oxide (La 2 o 3 ) etc. are often too expensive, and the coating is uneven on the surface of the material, and cannot form a continuous surface, which affects the performance of the material

Method used

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  • Modified single-crystal ternary positive electrode material and preparation method thereof
  • Modified single-crystal ternary positive electrode material and preparation method thereof
  • Modified single-crystal ternary positive electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0047] This embodiment prepares a modified single crystal ternary positive electrode material, including the following steps:

[0048] (1) Weigh Ni at a molar ratio of 1:1.06 0.72 co 0.08 mn 0.2 (OH) 2 and lithium hydroxide, mixed evenly in a 3D mixer, heated up to 880°C at 10°C / min in an oxygen atmosphere, kept for 18 hours, and cooled to below 60°C to obtain the single crystal ternary material LiNi 0.72 co 0.08 mn 0.2 O.

[0049] (2) Take 2g of boron trifluoride ether, 7.6g of propylene oxide and 166.4g of PEG-200 and mix evenly, raise the temperature to 50°C and react for 2.5h; then add 125g of curcumin into the reaction system, and dropwise add ammonia water to adjust the pH to 10.5 , and then continue to heat up to 75 ° C for 2 hours; after the reaction is completed, adjust the pH to 7 with 1mol / L hydrochloric acid solution, and repeatedly wash with isopropanol for 3 to 4 times with suction filtration to obtain curcumin modified dibasic alcohol (M-CP ).

[0050] (...

Embodiment 2

[0054] This embodiment prepares a modified single crystal ternary positive electrode material, including the following steps:

[0055] (1) Weigh Ni at a molar ratio of 1:1.06 0.72 co 0.08 mn 0.2 (OH) 2 and lithium hydroxide, mixed evenly in a 3D mixer, heated up to 880°C at 10°C / min in an oxygen atmosphere, kept for 18 hours, and cooled to below 60°C to obtain the single crystal ternary material LiNi 0.72 co 0.08 mn 0.2 O.

[0056] (2) Mix 2g of boron trifluoride ethyl ether, 4.8g of propylene oxide and 141.6g of PEG-400 evenly, raise the temperature to 50°C and react for 2.5h; then add 84.2g of curcumin into the above reaction system, add dropwise NaOH aqueous solution to adjust pH to 11, then continue to heat up to 75 ° C for 2 hours; after the reaction is finished, adjust the pH to 7 with 1mol / L hydrochloric acid solution, wash repeatedly with isopropanol for 3 to 4 times and suction filter to obtain curcumin modified dibasic alcohol ( M-CP).

[0057] (3) Add 8.7g o...

Embodiment 3

[0061] This embodiment prepares a modified single crystal ternary positive electrode material, including the following steps:

[0062] (1) Weigh Ni at a molar ratio of 1:1.06 0.72 co 0.08 mn 0.2 (OH) 2 and lithium hydroxide, mixed evenly in a 3D mixer, heated up to 880°C at 10°C / min in an oxygen atmosphere, kept for 18 hours, and cooled to below 60°C to obtain the single crystal ternary material LiNi 0.72 co 0.08 mn 0.2 O.

[0063] (2) Mix 2g of boron trifluoride ether, 8.4g of propylene oxide and 160.4g of PEG-600 evenly, raise the temperature to 50°C and react for 2.5h; then add 141.6g of curcumin into the above reaction system, and dropwise add ammonia water to adjust the pH to 10, then continue to heat up to 75 ° C for 2 h; after the reaction is finished, adjust the pH to 7 with 1mol / L hydrochloric acid solution, wash repeatedly with isopropanol for 3 to 4 times and suction filter to obtain curcumin modified dibasic alcohol (M -CP).

[0064] (3) Add 6.26 g of polyc...

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Abstract

The invention discloses a modified single crystal ternary positive electrode material and a preparation method thereof. The traditional cross-linking agent is replaced by the hydrogen-bond interaction between the coordination bond formed by the unique beta-diketone group in curcumin and lanthanide series metal ions and the polymer chain, and the sulfonic acid type polymer with high elasticity and ductility is prepared; the generated sulfonic acid can effectively reduce the amount of residual alkali on the surface of the material, has high elasticity and ductility, and can effectively maintain the structure of the material in the repeated charging and discharging process of the battery, and the cycle performance of the battery can be improved.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a modified single crystal ternary positive electrode material and a preparation method thereof. Background technique [0002] The multiple advantages of lithium-ion batteries and the gradual approach of the "timetable" for banning fuel vehicles in various countries make them the first choice for power batteries. At this stage, in order to further meet the market demand, compared with the respective shortcomings of lithium cobalt oxide, lithium iron phosphate, and lithium manganese oxide, the high specific energy of ternary layered materials (NCM / A) is a research hotspot. However, experiments and practice have shown that: due to cation mixing, the residual alkali produced by the material absorbing water and the strong oxidizing Ni 3+ and Ni 4+ The existing disadvantages such as poor high-temperature performance cause the electrical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525C08G18/67C08G18/66C08G18/48C08G18/44C08G18/38
CPCH01M4/505H01M4/525H01M4/628H01M10/0525C08G18/6795C08G18/664C08G18/6651C08G18/3855C08G18/44C08G18/4854C08G18/6674H01M2004/028Y02E60/10
Inventor 高明昊丁楚雄魏博杨茂萍
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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