A kind of modified single crystal ternary cathode 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: 2022-07-08
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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  • A kind of modified single crystal ternary cathode material and preparation method thereof
  • A kind of modified single crystal ternary cathode material and preparation method thereof
  • A kind of modified single crystal ternary cathode material and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

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

[0048] (1) Weigh Ni in 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 to 880°C at 10°C / min in an oxygen atmosphere, kept for 18h, and cooled to below 60°C to obtain a 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 them evenly, heat up to 50°C and react for 2.5h; then add 125g of curcumin into the reaction system, add ammonia water dropwise to adjust the pH to 10.5 , and then continue to heat up to 75 °C and react for 2 h; after the reaction is completed, adjust the pH to 7 with 1 mol / L hydrochloric acid solution, and repeatedly wash with isopropanol for 3 to 4 times with suction filtration to obtain curcumin-modified diol (M-CP). ).

[0050] (3) Add 11.83g polyc...

Embodiment 2

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

[0055] (1) Weigh Ni in 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 to 880°C at 10°C / min in an oxygen atmosphere, kept for 18h, and cooled to below 60°C to obtain a single crystal ternary material LiNi 0.72 Co 0.08 Mn 0.2 O.

[0056] (2) 2g of boron trifluoride ether, 4.8g of propylene oxide and 141.6g of PEG-400 were mixed uniformly, and the temperature was raised to 50°C for reaction for 2.5h; then 84.2g of curcumin was added to the above reaction system, and NaOH aqueous solution was added dropwise to adjust pH to 11, and then continue to heat up to 75 °C for 2 h; after the reaction is completed, adjust the pH to 7 with 1 mol / L hydrochloric acid solution, and repeatedly wash with isopropanol for 3 to 4 times of suction filtration to obtain curcumin-modified diol ( M-CP). ...

Embodiment 3

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

[0062] (1) Weigh Ni in 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 to 880°C at 10°C / min in an oxygen atmosphere, kept for 18h, and cooled to below 60°C to obtain a single crystal ternary material LiNi 0.72 Co 0.08 Mn 0.2 O.

[0063] (2) 2g of boron trifluoride ether, 8.4g of propylene oxide and 160.4g of PEG-600 were mixed uniformly, and the temperature was raised to 50°C for reaction for 2.5h; then 141.6g of curcumin was added to the above reaction system, and ammonia water was added dropwise to adjust pH to 10, and then continue to heat up to 75 ° C for 2 h; after the reaction is completed, adjust the pH to 7 with 1 mol / L hydrochloric acid solution, and repeatedly wash with isopropyl alcohol for 3 to 4 times of suction filtration to obtain curcumin-modified diol (M -CP). ...

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Abstract

The invention discloses a modified single crystal ternary positive electrode material and a preparation method thereof. The present invention replaces the traditional cross-linking agent with the hydrogen bond between the coordination bond formed by the unique β-diketone group in curcumin and the lanthanide metal ion and the polymer chain, so as to obtain high elasticity and ductility. Sulfonic acid type polymer; the generated sulfonic acid can effectively reduce the amount of residual alkali on the surface of the material, and has both high elasticity and ductility, which can effectively maintain the structure of the material during the repeated charging and discharging of the battery, and improve the battery cycle performance. .

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 "timetable" of fuel-free vehicles in various countries are gradually approaching, making them the first choice for power batteries at present. At this stage, in order to further meet the market demand, compared with the respective shortcomings of lithium cobaltate, lithium iron phosphate, and lithium manganate, the ternary layered material (NCM / A) has a high specific energy and is a research hotspot. However, experiments and practice show that: residual alkali and strong oxidizing Ni 3+ and Ni 4+ The existing shortcomings such as poor high temperature performance lead to the rapid decay of the electrical properties of the material, and application in t...

Claims

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Application Information

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Patent Type & Authority Patents(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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