Preparation method of high-voltage cathode material Lil+xMn3/2-yNil/2-zMy+zO4 of lithium ion battery with long service life

A technology of positive electrode material and precipitation method, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of cumbersome process and achieve the effects of simple process, improved cycle performance and convenient operation

Inactive Publication Date: 2012-12-19
GUANGZHOU HKUST FOK YING TUNG RES INST
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However, this preparation...

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  • Preparation method of high-voltage cathode material Lil+xMn3/2-yNil/2-zMy+zO4 of lithium ion battery with long service life
  • Preparation method of high-voltage cathode material Lil+xMn3/2-yNil/2-zMy+zO4 of lithium ion battery with long service life
  • Preparation method of high-voltage cathode material Lil+xMn3/2-yNil/2-zMy+zO4 of lithium ion battery with long service life

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Embodiment 1

[0028] Weigh 2.969 g of MnCl 2 ·H 2 O, dissolved in 33 mL of ethylene glycol solution, and then added dropwise 1.5─2.0 g of polyethylene glycol 2000, at 50 oC Under the condition of heating in a water bath, slowly add 2.70 g of urea (the molar ratio of manganese dichloride: urea is 1:3) while stirring, and keep stirring for 1 hour at this temperature. The mixed solution was transferred to a 50 mL polytetrafluoroethylene-lined reactor and reacted at 200°C for 12 hours. After the reactor was cooled to room temperature, the resulting precipitate was separated by filtration, washed three times with deionized water and absolute ethanol, and dried under vacuum at 80°C for 12 hours to obtain white spherical MnCO 3 Precursor.

[0029] The eutectic lithium salt 0.38Li(OH) . h 2 O─0.62LiNO 3 , Spherical MnCO 3 with Ni(NO 3 ) 2 . 6H 2 O was fully mixed according to the ratio of 1.02:1.5:0.5, and kept at 200 °C for 4 h, and then calcined at 800 °C for 12 h to obtain a black pro...

Embodiment 2

[0032] The eutectic lithium salt 0.38Li(OH) . h 2 O─0.62LiNO 3 , the spherical MnCO prepared by Example 1 3 with Ni(NO 3 ) 2 . 6H 2 O was fully mixed according to the ratio of 1.05:1.5:0.5, then kept at 200 °C for 4 h, and then calcined at 800 °C for 12 h to obtain a black product, which was analyzed by elemental analysis and XRD respectively. It shows that the product is lithium nickel manganese oxide (Li 1.05 mn 1.5 Ni 0。5 o 4 ).

[0033] The spherical lithium nickel manganese oxide prepared under the above conditions was used as the positive electrode active material and matched with the appropriate electrolyte and separator to assemble a CR2025 battery. Under the charge and discharge conditions of 3.5─4.9 V, 2 C, the first cycle discharge specific capacity of this material is 120.0 mAh g -1 , the capacity retention after 300 cycles was 94%.

Embodiment 3

[0035] The eutectic lithium salt 0.74LiOH·H 2 O─0.26Li 2 CO 3 , the spherical MnCO prepared by Example 1 3 with Ni(NO 3 ) 2 . 6H 2 O was fully mixed according to the ratio of 1.02:1.5:0.5, and kept at 420 °C for 4 h, and then calcined at 700 °C for 12 h to obtain a black product, which was analyzed by elemental analysis and XRD respectively. It shows that the product is lithium nickel manganese oxide (Li 1.02 mn 0.5 Ni 0.5 o 4 -700 o C).

[0036] The spherical lithium nickel manganese oxide prepared under the above conditions was used as the positive electrode active material and matched with the appropriate electrolyte and separator to assemble a CR2025 battery. Under the charge and discharge conditions of 3.5─4.9 V, 2 C, the first cycle discharge capacity of this material is 111 mAh g -1 , with a capacity of 105 mAh g after 100 cycles -1 .

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Abstract

The invention discloses a novel preparation method of a high-voltage cathode material Lil+xMn3/2-yNil/2-zMy+zO4 (M is one of Cr, Al, Fe and Co or a composite of Cr, Al, Fe and Co) of a submicron spherical lithium ion battery. The method comprises the steps of: preparing spherical manganese carbonate as a reaction material and a template agent in a solvent heating or deposition method, and then preparing the material Lil+xMn3/2-yNil/2-zMy+zO4 by a novel route with a combination of insertion of low eutectic salts and medium-temperature calcination. The material Lil+xMn3/2-yNil/2-zMy+zO4 prepared in the method has the advantages of regular morphology, high purity, large tapping density, high specific capacity, good rate capability and excellent circulating performance (the discharging specific capacity reaches 122mAh/g under 2C conditions, and the capacity retention rate is up to 76 percent after 1500-circle circulation; and the specific capacity are respectively 120.3mAh/g, 119.5mAh/g and 112.1mAh/g under 3C, 5C and 10C charging/discharging conditions, and the corresponding capacity retention rates are respectively 91 percent, 82 percent and 80 percent after 500-circle circulation). The synthetic process is simple and can be controlled easily. Moreover, doping elements can be easily introduced to further optimize physical properties and chemical properties of the material.

Description

technical field [0001] The invention relates to a novel preparation method of a high-performance lithium-ion battery cathode active material. Especially the preparation of lithium nickel manganese oxide with submicron spherical structure, long cycle performance and high rate performance. Background technique [0002] Lithium-ion batteries have proven to be an advanced electrochemical energy storage and conversion system in a range of green energy technologies, such as hybrid electric vehicles, plug-in hybrid electric vehicles, and electric vehicles. Cathode materials are the key factors determining the performance of lithium-ion batteries, so the research and development of cathode active materials is an important part of the research on lithium-ion battery materials. But the current commercial LiCoO 2 It cannot meet the requirements of high energy density, high power density, low cost, and environmental friendliness. At present, people's research work on positive electro...

Claims

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Application Information

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IPC IPC(8): H01M4/48
CPCY02E60/12Y02E60/10
Inventor 邓远富钱韫娴邓胜男施志聪陈国华
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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