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A kind of lithium ion battery cathode material and preparation method thereof

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low conductivity and low stability, achieve high charge and discharge capacity, good structural stability, and excellent cycle stability The effect of sex and rate performance

Active Publication Date: 2017-02-15
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the purposes of the present invention is to provide a lithium-ion battery cathode material with high stability and high conductivity in order to solve the above-mentioned technical problems such as low stability and low conductivity of the cathode material of the lithium-ion battery

Method used

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  • A kind of lithium ion battery cathode material and preparation method thereof
  • A kind of lithium ion battery cathode material and preparation method thereof
  • A kind of lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A lithium-ion battery positive electrode material, that is, in Li 3 V 2 (PO 4 ) 3 The surface of the precursor is coated with a layer of SiO 2 Composite coating layer composed of and C; where Li 3 V 2 (PO 4 ) 3 Precursor, SiO 2 and the amount of C, calculated in molar ratio, that is, Li 3 V 2 (PO 4 ) 3 Precursor: SiO 2 :C is 1:0.57:4.92.

[0037] The preparation method of above-mentioned a kind of lithium-ion battery cathode material specifically comprises the following steps:

[0038] (1) Preparation of lithium vanadium phosphate by sol-gel method:

[0039] 0.629gLiOH·H 2 O, 1.170gNH 4 VO 3 , 1.725gNH 4 h 2 PO 4 ·H 2 O and 2.251 g oxalic acid (C 2 o 4 h 2 ) into 50ml of deionized water, stirred by magnetic force until uniformly mixed to obtain a clear blue-green solution, and then heated in a water bath at 70°C for 4 hours to evaporate water and form a blue-green sol;

[0040] LiOH·H used above 2 O, NH 4 VO 3 , NH 4 h 2 PO 4 ·H 2 O, oxa...

Embodiment 2

[0048] A lithium-ion battery positive electrode material, that is, in the pure phase Li 3 V 2 (PO 4 ) 3 The surface is coated with a layer of SiO 2 It is obtained from a composite coating layer composed of C and C; where the pure phase Li 3 V 2 (PO 4 ) 3 , SiO 2 and the amount of C, calculated by molar ratio, that is, pure phase Li 3 V 2 (PO 4 ) 3 : SiO 2 :C is 1:0.57:4.92.

[0049] The preparation method of above-mentioned a kind of lithium-ion battery cathode material specifically comprises the following steps:

[0050] (1) Preparation of pure-phase lithium vanadium phosphate by sol-gel method:

[0051] 0.629gLiOH·H 2 O, 1.170gNH 4 VO 3 , 1.725gNH 4 h 2 PO 4 ·H 2 O and 2.251 g oxalic acid (C 2 o 4 h 2 ) into 50ml of deionized water, stirred by magnetic force until uniformly mixed to obtain a clear blue-green solution, and then heated in a water bath at 70°C for 4 hours to evaporate water to form a blue-green sol;

[0052] LiOH·H used above 2 O, NH ...

Embodiment 3

[0066] A lithium-ion battery positive electrode material, that is, in the pure phase Li 3 V 2 (PO 4 ) 3 The surface is coated with a layer of SiO 2 It is obtained from a composite coating layer composed of C and C; where the pure phase Li 3 V 2 (PO 4 ) 3 , SiO 2 and the amount of C, calculated by molar ratio, that is, pure phase Li 3 V 2 (PO 4 ) 3 : SiO 2 :C is 1:0.57:4.92.

[0067] The preparation method of above-mentioned a kind of lithium-ion battery cathode material specifically comprises the following steps:

[0068] (1) Preparation of pure-phase lithium vanadium phosphate by sol-gel method:

[0069] 0.629gLiOH·H 2 O, 1.170gNH 4 VO 3 , 1.725gNH 4 h 2 PO 4 ·H 2 O and 2.251 g oxalic acid (C 2 o 4 h 2 ) into 50ml of deionized water, stirred by magnetic force until uniformly mixed to obtain a clear blue-green solution, and then heated in a water bath at a temperature of 70°C for 4 hours to evaporate water and form a blue-green sol;

[0070] LiOH·H used ...

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Abstract

The invention discloses a positive electrode material of lithium ion battery and a preparation method thereof. The positive electrode material of the lithium ion battery is a compound coating layer formed by coating a the surface of pure-phase Li3V2(PO4)3 with a layer composed of SiO2 and C, wherein a molar ratio of the pure-phaseLi3V2(PO4)3 to SiO2 to C is 1:0.57:4.92. The preparation method comprises the steps of preparing the pure-phase lithium vanadium phosphate by using a sol-gel method; then mixing diphenylsilanediol with the pure-phase lithium vanadium phosphate; grinding; then dropwise adding concentrated hydrochloric acid slowly to dehydrate and polymerize diphenylsilanediol on the surface of the pure-phase lithium vanadium phosphate; and finally sintering at a high temperature and cooling to a room temperature naturally, and thus the positive electrode material of the lithium ion battery is obtained. The rate capability and cycling stability of the positive electrode material of the lithium ion battery are improved in relative to that of the pure-phase lithium vanadium phosphate.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and a preparation method thereof. It belongs to the field of lithium-ion batteries. Background technique [0002] Lithium-ion batteries are currently the chemical power source with the highest energy density among commercial secondary batteries. They have been widely used in various portable electronic devices, and are also occupying an important position in fields such as electric vehicles and large-scale energy storage power stations for smart grids. [0003] LiCoO is the most widely used cathode material in commercial lithium-ion batteries. 2 , but LiCoO 2 Expensive, highly toxic, and poor safety greatly limit the application of this battery in the fields of electric vehicles and large-scale energy storage. Phosphate series material LiMPO 4 (M=Fe, Co, Mn, Ni) has very good safety and thermal stability due to its structural characteristics. Among them Li 3 V 2 (PO 4 ) 3 In recen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCH01M4/5825H01M4/62H01M10/0525Y02E60/10
Inventor 赖春艳魏娇娇汪镇
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER