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Method for controlling residual lithium on surface of layered nickelic positive electrode material

A cathode material and control layer technology, applied in the field of modification of layered high-nickel cathode materials, can solve the problems of destroying the material structure and electrochemical performance, and achieve the effect of good electrochemical performance

Active Publication Date: 2014-10-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, layered high-nickel materials are very sensitive to water, and they are prone to chemical delithiation reactions in water, so that lithium ions in the lattice dissolve into water in the form of LiOH, destroying the structure and electrochemical performance of the material [《Electrochemical and Solid State Letters (Electrochemical and Solid-State Letters), 2004, 7, A190-A193]

Method used

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  • Method for controlling residual lithium on surface of layered nickelic positive electrode material
  • Method for controlling residual lithium on surface of layered nickelic positive electrode material
  • Method for controlling residual lithium on surface of layered nickelic positive electrode material

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Embodiment 1

[0030]With Ni 0.8 co 0.15 Al 0.05 (OH) 2 As the precursor, with LiOH·H 2 O is the lithium source (slightly excessive), and the high-nickel cathode material LiNi is prepared by a high-temperature solid-phase method. 0.8 co 0.15 Al 0.05 o 2 , to detect the amount of residual lithium in the material to be washed, to be washed. Configure LiOH washing solution: obtain the solubility s (g / 100g water) of LiOH in pure water at the current room temperature (or the temperature of the solution system when washing the material) by calculation or measurement; then measure the mass of the residual lithium source in the material to be washed Fraction x; finally, dissolve y g lithium source in V mL pure water to prepare washing solution. The physical parameters in this method satisfy y=0.01Vs-mx, wherein m is the total mass of the material to be washed, and both x and y are in LiOH equivalent.

[0031] Take 20g of the material to be washed and add it to 50mL of the above washing liqu...

Embodiment 2

[0033] With Ni 0.8 co 0.15 Al 0.05 (OH) 2 As the precursor, with LiOH·H 2 O is the lithium source (slightly excessive), and the high-nickel cathode material LiNi is prepared by a high-temperature solid-phase method. 0.8 co 0.15 Al 0.05 o 2 , to be washed. Configure LiOH washing solution: obtain the solubility s (g / 100g water) of LiOH in pure water at the current room temperature (or the temperature of the solution system when washing the material) by calculation or measurement; then measure the mass of the residual lithium source in the material to be washed Fraction x; then prepare saturated LiOH solution a mL; finally add pure water b mL to the above solution to obtain a washing solution. The physical parameters described in the method satisfy mx=0.01sb, and x is in LiOH equivalent.

[0034] Take 20g of the material to be washed and add it to 50mL of washing liquid and stir it magnetically for 5min, then separate the solid and liquid, wash and dry to obtain the wash...

Embodiment 3

[0036] With Ni 0.8 co 0.15 Al 0.05 (OH) 2 As the precursor, with LiOH·H 2 O is the lithium source (slightly excessive), and the high-nickel cathode material LiNi is prepared by a high-temperature solid-phase method. 0.8 co 0.15 Al 0.05 o 2 , to detect the amount of residual lithium in the material to be washed, to be washed. Configure LiOH washing solution: obtain the solubility s of LiOH in pure water at the current room temperature by calculation or measurement 1 (g / 100g water); then measure and calculate the mass fraction x of the residual lithium source in the material to be washed; then prepare a saturated LiOH solution a mL; finally raise the temperature of the saturated LiOH solution to increase its solubility to s 2 , to obtain the wash solution. The physical quantity described in this method satisfies mx+0.01s 1 a=0.01s 2 a, x is in LiOH equivalent.

[0037] Take 20g of the material to be washed and add it to the above washing solution, stir it magneticall...

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Abstract

The invention discloses a method for controlling residual lithium on surface of a layered nickelic positive electrode material. The method comprises the following steps: detecting a residual quantity x of lithium element in the layered nickelic positive electrode material which is prepared or obtained and representing the mass fraction of the obtained residual lithium in the layered nickelic positive electrode material by using x; measuring and calculating solubility s of a specific lithium source under certain temperature in pure water; preparing a specific lithium source aqueous solution with a specific mass concentration according to the measured lithium element residual quantity x and the solubility s; then fully washing the layered nickelic positive electrode material with the prepared specific lithium source aqueous solution; finally separating solid and liquid and drying to obtain the layered nickelic positive electrode material with controlled residual lithium on the surface. The method is simple to operate and is capable of effectively removing the residual lithium on the surface of the material and avoiding the chemical lithium removing effect in crystals of the washed materials.

Description

technical field [0001] The invention belongs to the technical field of preparation and modification methods of lithium-ion battery materials, and in particular relates to a modification method of layered high-nickel positive electrode materials. Background technique [0002] In recent years, with the emergence of energy crisis and environmental problems, the development of new energy materials and devices has received great attention. Among them, lithium-ion batteries are considered to be a new generation of high-energy power sources that are expected to be applied to electric vehicles and energy storage power stations. However, conventional LiCoO 2 Cathode materials are difficult to be used in large-scale energy storage batteries due to the shortage of resources and great environmental hazards. LiNiO 2 is a LiCoO 2 Materials with the same structure, and have higher energy density, lower resource cost and lower toxicity. However, the pure phase of LiNiO 2 It is not easy...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505
CPCY02E60/122H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李新海黄斌王志兴郭华军王接喜徐燕彭文杰胡启阳
Owner CENT SOUTH UNIV
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