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Method for modifying ZrO2-coated lithium-rich laminar cathode material of lithium ion battery

A lithium-ion battery, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as affecting the electrochemical performance and cycle stability of materials, destroying the surface film of electrode materials, and deteriorating battery cycle performance. Good cycle performance, good electrochemical performance, and good environmental friendliness

Inactive Publication Date: 2013-05-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the lithium-rich layered cathode material has a high discharge capacity (≥250mAh / g) when charged to 4.8V, the electrolyte will be oxidized under high voltage to generate H + , the acidity of the electrolyte is increased, so that the surface film of the electrode material is damaged by HF, which seriously affects the electrochemical performance and cycle stability of the material
At the same time, during the first charging process, part of the Li + With Li 2 The form of O comes out, but cannot be re-inserted during the discharge process, resulting in a large irreversible capacity, while Li 2 The release of O will damage the surface of the electrode, leading to an increase in the impedance of the battery and deteriorating the cycle performance of the battery.

Method used

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  • Method for modifying ZrO2-coated lithium-rich laminar cathode material of lithium ion battery
  • Method for modifying ZrO2-coated lithium-rich laminar cathode material of lithium ion battery
  • Method for modifying ZrO2-coated lithium-rich laminar cathode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Lithium-rich cathode material Li 1.2 mn 0.54 Ni 0.13co 0.13 o 2 Preparation: NiSO 4 ·6H 2 O, CoSO 4 ·7H 2 O, MnCl 2 4H 2 O is raw material, takes nickel sulfate 2.623kg according to the ratio in molecular formula, cobalt sulfate 2.805kg and manganese chloride 7.99kg are made into the 30L solution A that metal element concentration is 2mol / L. Weigh Na 2 CO 3 6.372kg was prepared into 40L of 1.5mol / L solution, wherein 510.9g of ammonia water was added, mixed evenly and recorded as solution B. Add 20L of deionized water into the reaction kettle as the bottom liquid, and slowly add solutions A and B into the reaction kettle at a feeding speed of 30ml / min at the same time, and control the pH value of the reaction process by adjusting the pH value to 8, the temperature at 60°C, and the stirring speed at 500°C RPM / min, age for 2 hours after the reaction is complete, filter with suction, wash, and dry to obtain the nickel-cobalt-manganese carbonate precursor. T...

Embodiment 2

[0032] 1), preparation of lithium-rich cathode material Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 , the steps are the same as step 1) in Example 1).

[0033] 2), in 40ml n-propanol solution, drop 0.2279g Zr(OC 3 h 7 ) 4 , quickly covered with plastic wrap, and stirred at room temperature for 15 minutes. After 15min, quickly add 2.94g Li to the above solution 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 Cover the positive electrode material with plastic wrap and stir for 4 hours at room temperature; after stirring for 3 hours, punch some small holes in the plastic wrap.

[0034] 3) Transfer the solution obtained in step 2) to a constant temperature water bath at 80°C, remove the plastic wrap after 30 minutes, and stir until the n-propanol evaporates to dryness.

[0035] 4) The experimental materials obtained in step 3) were placed in a watch glass and dried in a drying oven at 80°C for 12 hours.

[0036] 5) The experimental material obtained in step 4) is heat-treated, raised to 450°...

Embodiment 3

[0038] 1), preparation of lithium-rich cathode material Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 , the steps are the same as step 1) in Example 1).

[0039] 2) Add 0.5997g Zr(OC 3 h 7 ) 4 , quickly covered with plastic wrap, and stirred at room temperature for 15 minutes. After 15 minutes, quickly add 2.91g of positive electrode material to the above solution, cover with plastic wrap, and stir at room temperature for 4 hours; after stirring for 3 hours, make some small holes in the plastic wrap.

[0040] 3) Transfer the solution obtained in step 2) to a constant temperature water bath at 80°C, remove the plastic wrap after 30 minutes, and stir until the n-propanol evaporates to dryness.

[0041] 4) The experimental materials obtained in step 3) were placed in a watch glass and dried in a drying oven at a temperature of 80°C.

[0042] 5) The experimental material obtained in step 4) is heat-treated, raised to 450°C at 2-3°C / min, sintered at 450°C for 4 hours, and cooled to r...

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Abstract

The invention discloses a method for modifying a ZrO2-coated lithium-rich laminar cathode material of a lithium ion battery. The method comprises the steps as follows: dissolving zirconium isopropoxide, zirconium propoxide or tetrabutyl zirconate in a solvent to prepare 0.001-1 mol / L of zirconate solution; dispersing the lithium-rich laminar cathode material in the prepared zirconate solution according to the mass ratio of ZrO2 to the lithium-rich laminar cathode material, ultrasonically mixing, sealing and stirring to obtain sol; evaporating the solvent of the prepared sol to dryness and drying to obtain a solid matter; and sintering the obtained solid matter for 1-10 h at the temperature of 350-600 DEG C to prepare the ZrO2-coated lithium-rich laminar cathode material. The ZrO2-coated lithium-rich laminar cathode material prepared with the method has the characteristics of high electrochemical capacity, good cycle stability, excellent rate performance and the like; and the preparation method is simple, easy, low in cost and good in reproducibility.

Description

technical field [0001] The present invention relates to a kind of ZrO 2 The invention discloses a method for modifying a lithium-rich layered positive electrode material of a coated lithium ion battery, belonging to the lithium ion battery positive electrode material technology. Background technique [0002] Lithium-ion batteries are widely used because of their high energy density, high working voltage, light weight, small size, no memory effect, and environmental friendliness. At present, lithium-ion batteries are ideal mobile power sources for portable devices such as mobile phones, notebooks, and digital cameras. At the same time, using the "stacked battery structure", multiple batteries are made into very thin layers and then stacked together to achieve high performance with a small volume. The energy meets the high energy density requirements of electric vehicles for energy storage power supplies. In addition, the application and development of lithium-ion batteries...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/48
CPCY02E60/12Y02E60/10
Inventor 赵乃勤王志远师春生刘恩佐何春年
Owner TIANJIN UNIV
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