Modified LiNi1/2Mn3/2O4 cathode material prepared by coating with lithium ion conductor Li2MO3 (M=Ti, Si or Zr) and preparation method thereof

A positive electrode material, lithium ion technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems such as the negative impact of high rate performance of materials, and achieve simple and controllable coating process, low cost, and improved high temperature cycle stability Effect

Active Publication Date: 2013-11-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the invention is: for existing about LiNi 0.5 mn 1.5 o 4 In the coating modification technology, the coating layer used is mainly a poor conductor of lithium ions, which will cause certain negative effects on the high rate performance of the material in most cases. The coating layer is replaced by a lithium ion conductor, providing A lithium-ion conductor Li with good high-temperature cycle stability and rate performance, which can be adapted to large-scale production 2 MO 3 (M=Ti, Si, Zr) coated modified LiNi 0.5 mn 1.5 o 4 Positive electrode material and preparation method thereof

Method used

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  • Modified LiNi1/2Mn3/2O4 cathode material prepared by coating with lithium ion conductor Li2MO3 (M=Ti, Si or Zr) and preparation method thereof
  • Modified LiNi1/2Mn3/2O4 cathode material prepared by coating with lithium ion conductor Li2MO3 (M=Ti, Si or Zr) and preparation method thereof
  • Modified LiNi1/2Mn3/2O4 cathode material prepared by coating with lithium ion conductor Li2MO3 (M=Ti, Si or Zr) and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] First, nickel acetate, manganese acetate, lithium acetate and citric acid are dissolved in water sequentially according to Ni:Mn:Li:citric acid=1:3:2.06:6 (molar ratio), slowly evaporated at 80 ℃, and sintered at 750 ℃ Preparation of nanoscale LiNi in 15 h 0.5 mn 1.5 o 4 Cathode material (referred to as: LNMO). Then, it was dispersed in ethanol to form a suspension with constant stirring. Under the condition of stirring speed of 80 rpm / min, according to Li 2 TiO 3 To account for 5% of the mass fraction of the coated positive electrode material, tetrabutyl titanate (TBOT) was added. After 0.5 h, a small amount of 28% ammonia water (the mass ratio of TBOT to ammonia water = 5:1) was added, the stirring speed was kept at 80 rpm / min, and the temperature was 40 °C for hydrolysis reaction, and the solvent was evaporated to dryness. Finally, lithium hydroxide was added according to the stoichiometric ratio and mixed evenly, and calcined at 750 °C for 4 h to obtain Li 2...

Embodiment 2

[0028] First, lithium carbonate, nickel oxide, and manganese dioxide were mixed according to Li:Ni:Mn=2.1:1:3 (molar ratio), and sintered at 800 °C for 10 h to prepare LiNi 0.5 mn 1.5 o 4 Cathode material. Then, it was dispersed in ethanol to form a suspension with constant stirring. Under the condition of stirring speed of 100 rpm / min, according to Li 2 TiO 3 Add tetrabutyl titanate (TBOT) in proportion to 3% of the mass fraction of the coated positive electrode material. After 1 h, add a small amount of 28% ammonia water (the mass ratio of TBOT to ammonia water = 5:1), keep the stirring speed at 100 rpm / min, and carry out the hydrolysis reaction at 40 °C, and evaporate the solvent to dryness. Finally, lithium acetate was added according to the stoichiometric ratio and mixed evenly, and calcined at 800 °C for 2 h to obtain Li 2 TiO 3 coated modified LiNi 0.5 mn 1.5 o 4 Cathode material. Comparing the coated sample with the pure phase sample: coated Li 2 TiO 3 Aft...

Embodiment 3

[0030] First, the co-precipitation method was used to prepare spherical Ni 0.25 mn 0.75 CO 3 precursor, and according to Li:Ni= 2.1:1 (molar ratio) mixed with lithium hydroxide, sintered at 800 °C for 10 h to obtain spherical LiNi 0.5 mn 1.5 o 4 Cathode material. Then, it was dispersed in ethanol to form a suspension with constant stirring. Under the condition of stirring speed of 80 rpm / min, according to Li 2 TiO 3 Add tetrabutyl titanate (TBOT) in proportion to 1% of the mass fraction of the coated positive electrode material. After 1 h, a small amount of 28% ammonia water (the mass ratio of TBOT to ammonia water = 5:1) was added, the stirring speed was kept at 80 rpm / min, and the temperature was 40 °C for hydrolysis reaction, and the solvent was evaporated to dryness. Finally, lithium oxalate was added according to the stoichiometric ratio and mixed evenly, and calcined at 800 °C for 3 h to obtain Li 2 TiO 3 coated modified LiNi 0.5 mn 1.5 o 4 Cathode material....

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Abstract

A modified LiNi1 / 2Mn3 / 2O4 cathode material prepared by coating with lithium ion conductor Li2MO3 (M=Ti, Si or Zr) and a preparation method thereof belong to the technical field of lithium ion battery cathode materials. The coated cathode material in the method is LiNi0.5Mn1.5O4; the chemical constitution of the lithium ion conductor is Li2MO3, wherein M is Ti or Si or Zr; Li2MO3 accounts for 1%-3% of the mass of the coated cathode material. According to the invention, the lithium ion conductor replaces a coating layer, so that the modified cathode material has excellent high-temperature cycling stability and rate capability and can adapt to large-scale production.

Description

[0001] technical field [0002] The invention belongs to the technical field of lithium ion battery cathode materials, in particular to lithium ion conductor Li 2 MO 3 (M=Ti, Si, Zr) coated modified LiNi 0.5 mn 1.5 o 4 Cathode material and preparation method thereof. Background technique [0003] With the advent of the information age, lithium-ion batteries are widely used in electronic instruments, notebook computers, mobile phones, cameras and various portable electric tools, and gradually become an indispensable product in people's lives. However, the current commercial lithium-ion batteries still cannot meet the low-cost and high-energy-density requirements of electric vehicles. Research and development of lithium-ion batteries with higher specific energy, lower price and longer life is the key to the development of electric vehicle industry. As we all know, the performance and cost of cathode materials determine the performance and cost of batteries to a large ext...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/36
CPCY02E60/122Y02E60/10
Inventor 张校刚邓海福聂平申来法罗海峰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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