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Phosphorus-doped lithium battery high-nickel positive electrode material and preparation process thereof

A positive electrode material and preparation process technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of reduced material cycle stability, reduced battery life, and battery capacity attenuation, so as to improve the rate performance and improve stability , conducive to the effect of diffusion

Active Publication Date: 2020-11-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the increase of nickel content (LiNi x mn 1-x o 2 , LiNi x co y mn 1-x-y o 2 , x>0.5), the cycle stability of the material is reduced, and the thermal stability is deteriorated, which will lead to rapid decay of battery capacity and reduced battery life

Method used

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  • Phosphorus-doped lithium battery high-nickel positive electrode material and preparation process thereof
  • Phosphorus-doped lithium battery high-nickel positive electrode material and preparation process thereof
  • Phosphorus-doped lithium battery high-nickel positive electrode material and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] 1) Weigh 10.5mmol of lithium acetate, 8mmol of nickel acetate and 2mmol of manganese acetate, and add them together to 87ml of N’N-dimethylformamide, and stir until all raw materials are completely dissolved.

[0067] 2) Weigh 4.3 g of polyacrylonitrile, add it into the solution described in step 1, and stir overnight until the polymer is completely dissolved, and the resulting liquid is the spinning solution.

[0068] 3) Transfer the above spinning solution into a 10ml syringe, and take another 21G needle (0.51mm inner diameter) as the spinning needle. Under the condition that the forward voltage is 13KV, the negative voltage is -2.0KV, the distance between the spinning port and the receiver is 15cm, and the injection speed of the spinning solution is 0.3mm / min, the LiNi 0.8 mn 0.2 o 2 Precursor nanofibers (such as figure 1 shown).

[0069] 4) Place the precursor nanofibers obtained in step 3 in a muffle furnace and raise the temperature to 270°C at a rate of 3°C / m...

Embodiment 2

[0073] 1) Weigh 10.5mmol of lithium acetate, 8mmol of nickel acetate and 2mmol of manganese acetate, and add them together to 87ml of N’N-dimethylformamide, and stir until all raw materials are completely dissolved.

[0074] 2) Weigh 8g of polyacrylonitrile, add it into the solution described in step 1, and stir overnight until the polymer is completely dissolved, and the resulting liquid is the spinning solution.

[0075] 3) Transfer the above spinning solution into a 10ml syringe, and take another 21G needle (0.51mm inner diameter) as the spinning needle. Under the condition that the forward voltage is 13.5KV, the negative voltage is -2.0KV, the distance between the spinning port and the receiver is 15cm, and the injection speed of the spinning solution is 0.3mm / min, the LiNi 0.8 mn 0.2 o 2 Precursor nanofibers.

[0076] 4) Place the precursor nanofibers obtained in step 3 in a muffle furnace and raise the temperature to 220°C at a rate of 3°C / min to 5°C / min, keep at this...

Embodiment 3

[0080] 1) Weigh 10.5mmol of lithium acetate, 8mmol of nickel acetate and 2mmol of manganese acetate, and add them together to 87ml of N’N-dimethylformamide, and stir until all raw materials are completely dissolved.

[0081] 2) Weigh 12 g of polyacrylonitrile, add it into the solution described in step 1, and stir overnight until the polymer is completely dissolved, and the resulting liquid is the spinning solution.

[0082] 3) Transfer the above spinning solution into a 10ml syringe, and take another 21G needle (0.51mm inner diameter) as the spinning needle. Under the condition that the forward voltage is 13.5KV, the negative voltage is -2.0KV, the distance between the spinning port and the receiver is 15cm, and the injection speed of the spinning solution is 0.3mm / min, the LiNi 0.8 mn 0.2 o 2 Precursor nanofibers.

[0083] 4) Place the precursor nanofibers obtained in step 3 in a muffle furnace and raise the temperature to 220°C at a rate of 3°C / min to 5°C / min, keep at th...

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Abstract

The invention discloses a phosphorus-doped lithium battery high-nickel positive electrode material, a preparation process and a lithium ion battery based on the positive electrode material. The positive electrode material comprises phosphorus, LiNixMn1xO2 nanofibers or LiNixCoyMn1xyO2 nanofibers, and has the characteristics of low residual lithium content on the surface, high length-diameter ratio, high specific surface area, high specific capacity, long cycle life, simple and convenient preparation process and the like.

Description

technical field [0001] The invention relates to a phosphorus-doped lithium battery high-nickel cathode material, a preparation process and a lithium ion battery based on the cathode material. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high power density, high working voltage, long cycle life, good safety performance, no memory effect, and no pollution. From its birth to now, its application field has rapidly expanded from the initial mobile communication field to It is one of the most widely used secondary batteries in the fields of automobile, military, aerospace, medical and so on. With the expansion of application fields and the increase of downstream demand, consumers' demand for high energy density lithium batteries is becoming increasingly urgent. [0003] At present, the capacity of commercial secondary lithium batteries mainly depends on the capacity of cathode materials. To further increase the energy density of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525D01F9/08B82Y30/00
CPCH01M4/505H01M4/525H01M10/0525D01F9/08B82Y30/00H01M2004/021H01M2004/028Y02E60/10
Inventor 孙赛高焕新刘志成
Owner CHINA PETROLEUM & CHEM CORP
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