Clad modified layered cathode material of lithium-ion battery and preparation method of layered cathode material

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of low cost, easy process control, and maintaining electrochemical inertness

Inactive Publication Date: 2014-09-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Li was synthesized by wet method 2 TiO 3 The research on coated and modified layered cathode materials for lithium-ion batteries has not been reported yet

Method used

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  • Clad modified layered cathode material of lithium-ion battery and preparation method of layered cathode material
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  • Clad modified layered cathode material of lithium-ion battery and preparation method of layered cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Lithium nitrate (LiNO 3 ), tetrabutyl titanate (C 16 h 36 o 4 Ti), citric acid (C 6 h 8 o 7 ) as the raw material. First, an appropriate amount of tetrabutyl titanate is dissolved in ethanol solution, the volume ratio of titanium source to ethanol is 1-5, and an appropriate amount of ethylene glycol is dropped into the solution (to promote the formation of a more stable gel), and at the same time Lithium nitrate and complexing agent citric acid were dissolved in deionized water. Then, the prepared two solutions were mixed slowly under constant stirring, so that the molar ratio of the complexing agent to (Li+Ti) was 1:2, and the molar ratio of the complexing agent to ethylene glycol was 1:1. Using NH 3 ·H 2 O to adjust the pH of the solution to 5, and stir to form a suspension.

[0027] Will Li 1.2 [Mn 0.51 Ni 0.19 co 0.1 ]O 2 Add the positive electrode material into the above solution, heat and stir at 60° C., and obtain a sol with the evaporation of the ...

Embodiment 2

[0032] Lithium hydroxide (LiOH), titanium isopropoxide (Ti[OCH(CH 3 ) 2 ] 4 ), PVP (M.W.30000) as raw materials. First, an appropriate amount of titanium isopropoxide is dissolved in ethanol solution, the volume ratio of titanium source to ethanol is 1-10, and an appropriate amount of ethylene glycol is dropped into the solution, and lithium hydroxide and complexing agent PVP are dissolved in deionized water. Then the prepared two solutions were mixed slowly under constant stirring, the molar ratio of complexing agent to (Li+Ti) was 1:0.5, and the molar ratio of complexing agent to ethylene glycol was 1:2. Then adjust the pH value of the solution to 6 with acetic acid solution, and stir to form a suspension.

[0033] Will Li[Ni 0.5 co 0.2 mn 0.3 ]O 2 Add the positive electrode material into the above solution, heat and stir at 50° C., and obtain a sol with the evaporation of the solvent. Place in a blast drying oven and dry at 90°C for 24 hours to obtain the coated pr...

Embodiment 3

[0035] Lithium carbonate (Li 2 CO 3 ), titanium tetrachloride (TiCl 4 ), PEG2000 are raw materials. First, dissolve an appropriate amount of titanium tetrachloride in ethanol solution, the volume ratio of titanium source and ethanol is 1-6, and drop an appropriate amount of ethylene glycol into the solution, and dissolve lithium carbonate and complexing agent PEG2000 in the solution at the same time. ionized water. Then, the prepared two solutions were mixed slowly under constant stirring, so that the molar ratio of the complexing agent to (Li+Ti) was 1:1, and the molar ratio of the complexing agent to ethylene glycol was 1:1.5. Adjust the pH value of the solution to 7 with acetic acid solution, and stir to form a suspension.

[0036] LiCoO 2 The cathode material was added to the above solution, heated and stirred at 80° C., and a sol was obtained as the solvent evaporated. Place in a vacuum oven and dry at 120° C. for 12 hours to obtain the coated precursor. The precur...

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Abstract

The invention discloses a clad modified layered cathode material of a lithium-ion battery and a preparation method of the layered cathode material. The material is obtained by evenly covering the layered cathode material of the lithium-ion battery by a Li2TiO3 thin film. The preparation method comprises the following steps: (1) dissolving a titanium source in an ethanol solution, and dropwise adding glycol to form a solution A; dissolving a lithium salt and a complexing agent in deionized water to form a solution B; (2) mixing the two solutions and regulating the pH value of the mixed solution to the range of 5-7 by use of a weakly alkaline liquor or a weakly acidic liquor; (3) adding the layered cathode material of the lithium-ion battery to a suspension, and heating and stirring to obtain a sol; drying the sol to obtain a precursor; grinding and annealing the precursor to obtain the target product. The method is used for modifying the layered cathode material of the lithium-ion battery by covering the layered cathode material with the Li2TiO3 thin film; the surface thin film covering the cathode material by use of the method is clad evenly, and the method is mature and reliable.

Description

technical field [0001] The invention relates to the field of preparation of layered cathode materials for lithium-ion batteries, in particular to surface coating modification of layered cathode materials for lithium-ion batteries and a preparation method thereof. Background technique [0002] Because lithium batteries have a series of outstanding advantages such as high energy density, light weight, no memory effect, good rate performance, and long cycle life, they are recognized as the ideal energy source for next-generation electric vehicles and hybrid electric vehicles. The energy density of lithium-ion batteries mainly depends on the energy density of the cathode material, so the development of cathode materials with high energy density has become the focus of attention. [0003] Due to the reaction between the layered cathode material and the electrolyte (such as redox reaction), it will cause problems such as the dissolution of metal elements (such as Mn) in the layere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/48
CPCY02E60/122H01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 周飞任崇孔继周
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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