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Preparation method of rare earth metal doped high-nickel ternary battery positive electrode material

A ternary battery, rare earth metal technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., to achieve the effect of reducing the mixing effect

Pending Publication Date: 2020-04-14
凤阳泰和九思科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of ternary materials is that it has high energy density and sufficient power, but it also has some defects, some problems that have not been completely solved
The results show that the phenomenon of Li / Ni mixing weakens with the increase of oxygen concentration, but because a small amount of water vapor and carbon dioxide will be generated in the reaction process and the carbon dioxide will not be discharged in time, the limit value of oxygen concentration is lower than 90%, or even smaller
Another limiting factor is pressure. The solid state sintering of ternary materials requires a slight negative pressure, which also limits the continuous increase of oxygen concentration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of a rare-earth metal-doped high-nickel ternary battery positive electrode material, the method comprising the following steps:

[0025] (1) The ternary precursor Ni 0.7 co 0.15 mn 0.15 (OH) 2 with lithium source Li 2 CO 3 , dopant CeO 2 , Y 2 o 3 Mixed according to the mass ratio of 1:0.52:0.0015:0.0007, where mNi 0.7 co 0.15 mn 0.15 (OH) 2 = 15g, mLi 2 CO 3 =7.80g, mTiO 2 =0.0225g,mY 2 o 3 = 0.0105 g. The mixture was thoroughly ground and mixed for 2 hours.

[0026] (2) Put the ground calcined material into a tube furnace, and sinter at a low temperature for 5 hours in an air atmosphere, wherein the sintering temperature is set at 520°C. After sintering, it was naturally cooled to room temperature.

[0027] (3) The primary sintered material that has been cooled above is fully crushed by a jaw crusher and a double-roll crusher, and ball milled. Control its particle size D504 ) 2 (NO 3 ) 6 , the amount of addition is 0.0235g, ...

Embodiment 2

[0032] A preparation method of a rare-earth metal-doped high-nickel ternary battery positive electrode material, the method comprising the following steps:

[0033] (1) The ternary precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 with lithium source Li 2 CO 3 , dopant La 2 o 3 , Y 2 o 3 Mixed according to the mass ratio of 1:0.55:0.0025:0.0014, where m Ni 0.8 co 0.1 mn 0.1 (OH) 2 =14g, mLi2 CO 3 =8.25g, mLa 2 o 3 =0.0375g,mY 2 o 3 = 0.0021 g. The mixture was thoroughly ground and mixed for 2 hours.

[0034] (2) Put the ground calcined material into a tube furnace, and sinter at a low temperature for 5 hours in an air atmosphere, wherein the sintering temperature is set at 540°C. After sintering, it was naturally cooled to room temperature.

[0035] (3) The primary sintered material that has been cooled above is fully crushed by a jaw crusher and a double-roll crusher, and ball milled. Control its particle size D504 ) 2 (NO 3 ) 6 , the amount of addition is 0.0255g...

Embodiment 3

[0039] A preparation method of a rare-earth metal-doped high-nickel ternary battery positive electrode material, the method comprising the following steps:

[0040] (1) The ternary precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 with lithium source Li 2 CO 3 , dopant La 2 o 3 , Y 2 o 3 , CeO 2 Mixed according to the mass ratio of 1:0.52:0.002:0.001:0.0012, where mNi 0.5 co 0.2 mn 0.3 (OH) 2 =12g, mLi 2 CO 3 =6.24g, mLa 2 o 3 =0.024g,mY 2 o 3 = 0.012g, mCeO 2 = 0.0144g. The mixture was thoroughly ground and mixed for 2 hours.

[0041] (2) Put the ground calcined material into a tube furnace, and sinter at a low temperature for 5 hours in an air atmosphere, wherein the sintering temperature is set at 540°C. After sintering, it was naturally cooled to room temperature.

[0042] (3) The primary sintered material that has been cooled above is fully crushed by a jaw crusher and a double-roll crusher, and ball milled. Control its particle size D504 ) 2 (NO 3 ) 6 , th...

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Abstract

The invention discloses a preparation method of a rare earth metal doped high-nickel ternary battery positive electrode material. The method provided by the invention comprises the following steps: adding a doped coating agent for low-temperature presintering, crushing and grinding for the first time, adding an oxidant for high-temperature sintering, and crushing and grinding again to obtain a finished product. According to the method provided by the invention, a rare earth compound ceric ammonium nitrate Ce(NH4)2(NO3)6 which is doped with a rare earth metal oxide and has oxidability is addedin the sintering process of the ternary material, so that divalent Ni in the ternary material is oxidized by an oxidant, and the Li / Ni mixed arrangement phenomenon is weakened; and the doped rare earth element compound further reduces the internal resistance of the ternary battery material and improves the internal chemical stability of the whole battery.

Description

technical field [0001] The invention relates to the technical field of new energy lithium-ion secondary batteries, in particular to a method for preparing a rare earth metal-doped high-nickel ternary positive electrode material. Background technique [0002] Since the 21st century, lithium-ion batteries have been widely used in digital 3C, power batteries and other aspects due to their excellent power performance, energy density, and double charging performance. However, many problems have been exposed in many application ways, so more and more research and development institutions and manufacturers have invested in the modification research of the new generation of lithium-ion secondary batteries. In the configuration of a full battery, the capacity of the battery depends largely on the performance of the positive electrode material of the battery. Among them, ternary materials, as a new hybrid modified cathode material, are being widely studied and applied. The advantage...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 白欧张志勇苗子帅姚思源韩永前
Owner 凤阳泰和九思科技有限公司
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