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Urchin-like sodium-containing lithium-rich layered cathode material and preparation method thereof

A positive electrode material and sea urchin-shaped technology, which is applied in the field of lithium-ion battery electrode materials and its preparation, can solve the problems of poor film formation, low tap density and compacted density, and achieve improved tap density and compacted density, reduced The effect of small transmission distance and simple preparation process

Active Publication Date: 2017-05-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the particle size of the material prepared by the polymer pyrolysis method is only 100-150nm, which is much smaller than the commercial micron-scale positive electrode material, and the film-forming property is poor, and it will lead to lower tap density and compaction. density

Method used

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  • Urchin-like sodium-containing lithium-rich layered cathode material and preparation method thereof
  • Urchin-like sodium-containing lithium-rich layered cathode material and preparation method thereof
  • Urchin-like sodium-containing lithium-rich layered cathode material and preparation method thereof

Examples

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Embodiment 1

[0030] (1) 110g MnSO 4 ·H 2 O, 41.22g NiSO 4 ·7H 2 O and 44.07gCoSO 4 ·7H 2 O was dissolved in 650mL deionized water to obtain a transparent solution 1; 102.23g Na 2 CO 3 and 12.71 g NH 4 HCO 3 Dissolve in 650 mL deionized water to obtain colorless and transparent solution 2. Under the conditions of water bath temperature of 45°C and mechanical stirring speed of 800rpm, solution 1 and solution 2 were simultaneously added dropwise to the reaction kettle with a peristaltic pump at a rate of 5mL / min. Wash with deionized water several times to remove unreacted impurity ions, and dry in an oven at 55 °C for 12 h to obtain a transition metal composite carbonate precursor.

[0031] (2) Put the transition metal composite carbonate precursor obtained in step (1) into a porcelain boat, then place it in a muffle furnace with an oxygen atmosphere, and heat it to 500°C at a heating rate of 4°C / min after 30min And keep it warm for 6 hours, then slowly cool down to room temperature...

Embodiment 2

[0035] (1) 142.41g manganese acetate tetrahydrate, 34.84g cobalt acetate tetrahydrate and 34.81g nickel acetate tetrahydrate were dissolved in 650mL deionized water to obtain transparent solution 1; 91.24g Na 2 CO 3 and 11.32 g NH 4 HCO 3 Dissolve in 650 mL deionized water to obtain colorless and transparent solution 2. Under the conditions of water bath temperature of 55°C and mechanical stirring speed of 700rpm, solution 1 and solution 2 were simultaneously added dropwise to the reaction kettle with a peristaltic pump at a rate of 8mL / min. After the dropwise addition, aged for 6h, suction filtered, Wash with deionized water several times to remove unreacted impurity ions, and dry in an oven at 55 °C for 6 h to obtain a transition metal composite carbonate precursor.

[0036] (2) Put the transition metal composite carbonate precursor obtained in step (1) into a porcelain boat, then place it in a muffle furnace with an oxygen atmosphere, and heat it to 450°C at a heating ra...

Embodiment 3

[0039] (1) 207.95g mass concentration of 50% Mn(NO 3 ) 2 Aqueous solution, 40.68g Ni(NO 3 ) 2 ·6H 2 O and 40.71g Co(NO 3 ) 2 ·6H 2 O was dissolved in 450mL deionized water to obtain a transparent solution 1; 91.24g Na 2 CO 3 and 6.90g (NH 4 ) 2 CO 3 Dissolve in 450 mL deionized water to obtain colorless and transparent solution 2. Under the conditions of water bath temperature of 60°C and mechanical stirring speed of 600rpm, solution 1 and solution 2 were added dropwise to the reaction kettle at the same time at a rate of 10mL / min. Washing several times to remove unreacted impurity ions, drying in a 55 °C oven for 10 h, to obtain a transition metal composite carbonate precursor.

[0040] (2) Put the transition metal composite carbonate precursor obtained in step (1) into a porcelain boat, then place it in a muffle furnace with an oxygen atmosphere, and heat it to 550°C at a heating rate of 8°C / min after 30min And keep it warm for 8 hours; then slowly cool down to ...

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Abstract

An urchin-like sodium-containing lithium-rich layered cathode material and a preparation method thereof belong to the field of a lithium ion battery electrode material and a preparation technology. The chemical composition of the material is Li1.2-zNazMn0.54Co0.13Ni0.13O2 (z is greater than or equal to 0.03 and less than or equal to 0.1), and the urchin-like structure is formed by hexagonal-prism-shaped primary particles. The method is prepared by the following steps: a transition metal composite carbonate (MCO3, M=Mn, Co, Ni) precursor is prepared by a coprecipitation method; through high-temperature roasting, transition metal composite oxide (MOx, M=Mn, Co, Ni) is obtained; and the transition metal composite oxide, a lithium source and a sodium source undergo ball-mill mixing, and finally high-temperature roasting is carried out so as to obtain the product. The invention has the following advantage: the material has good rate capability and cycling stability. During high-temperature roasting of the mixture of the transition metal composite oxide, the lithium source and the sodium source, by the influence of sodion on crystal growth orientation, the urchin-like sodium-containing lithium-rich layered material is obtained. In addition, the preparation process is simple.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode materials and preparation thereof, in particular to a sea urchin-like sodium-containing lithium-rich layered positive electrode material and a preparation method thereof. Background technique [0002] With the depletion of fossil fuel energy and the increasingly severe environmental pollution, electric vehicles have attracted more and more attention. The rapid development of electric vehicles has also put forward higher requirements for power lithium-ion batteries. Lithium-rich layered cathode materials have a higher specific capacity (up to 200mAh / g or more) and good safety performance than current general-purpose cathode materials, and have become the most promising anode materials for a new generation of power lithium-ion batteries. However, lithium-rich layered cathode materials still have problems such as low first-week Coulombic efficiency, poor cycle performance, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/1391
CPCY02E60/10
Inventor 杨文胜耿萌萌
Owner BEIJING UNIV OF CHEM TECH
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