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Preparation method of lithium ion battery anode material Li3V2(PO4)3

A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of explosive sol-gel process, flammability in spray drying process, and high synthesis temperature, so as to reduce potential safety hazards, The effect of suppressing excessive growth and uniform particle size

Inactive Publication Date: 2012-06-13
HARBIN INST OF TECH
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Problems solved by technology

[0004] The present invention is to solve the existing preparation Li 3 V 2 (PO 4 ) 3 The high-temperature solid-phase method and carbothermal reduction method have the problems of high synthesis temperature, long calcination time, high cost, flammability and explosion in the spray drying process, and complex sol-gel process, and provide a lithium-ion battery cathode material Li 3 V 2 (PO 4 ) 3 preparation method

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  • Preparation method of lithium ion battery anode material Li3V2(PO4)3

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specific Embodiment approach 1

[0010] Specific implementation mode one: the present implementation mode is a lithium-ion battery cathode material Li 3 V 2 (PO 4 ) 3 The preparation method is carried out according to the following steps: one, the ratio of the amount of substance of Li element, V element, P element and C element is (3~3.2): 2: 3: (2.5~3) The ratio takes lithium source , V 2 o 5 , phosphorus source and carbon source, the weighed solid material is placed in a ball mill, and a volume fraction of 1% to 5% hydrogen peroxide aqueous solution is added for wet ball milling to obtain a precursor, wherein the ratio of solid material to hydrogen peroxide aqueous solution 3g: (5mL ~ 15mL); 2. Under the protection of protective gas, the precursor obtained in step 1 is calcined for 7 ~ 9h at a temperature of 550 ~ 650 ° C, and cooled to room temperature to prepare the lithium ion battery cathode material Li 3 V 2 (PO 4 ) 3 .

[0011] The used ball of ball milling in this embodiment can adopt stee...

specific Embodiment approach 2

[0013] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step one, the material ratio of Li element, V element, P element and C element is (3.05~3.15):2:3:(2.6~ 2.9). Others are the same as in the first embodiment.

specific Embodiment approach 3

[0014] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that: the lithium source described in step one is LiOH·H 2 O, LiF, Li 2 CO 3 and LiCH 3 COO·H 2 One or a combination of O. Others are the same as in the first or second embodiment.

[0015] In this embodiment, when the lithium source is a mixture, various lithium sources can be mixed in any proportion to achieve the required amount of Li element.

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Abstract

The invention discloses a preparation method of a lithium ion battery anode material Li3V2(PO4)3. The preparation method provided by the invention mainly solves the problem that the existing high-temperature solid-phase method and the existing carbon-thermal reduction method for preparation of lithium vanadium phosphate have the defects that a sintering temperature is high; sintering time is long; a volatile organic solvent is utilized as a ball milling dispersant so that a cost is high; spray and drying processes are unsafe; and a sol-gel technology is complex. The preparation method comprises the following steps of weighing one or more lithium sources, V2O5, a carbon source and a phosphorus source, adding the one or more lithium sources, V2O5, the carbon source and the phosphorus source into a hydrogen peroxide aqueous solution, carrying out wet ball milling, and carrying out calcination at a temperature of 550 to 650 DEG C in a protective atmosphere to obtain the lithium ion battery anode material Li3V2(PO4)3. The preparation method provided by the invention has simple processes, a low synthesis temperature, short sintering time and high production safety. The lithium ion battery anode material Li3V2(PO4)3 obtained by the preparation method has an initial discharge specific capacity of 104mAh / g under multiplying power of 10C and a capacity retention ratio great than or equal to 96.4% after 50 cycles. The preparation method provided by the invention is utilized for preparation of battery anode materials.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] The positive electrode material is the key factor to improve the performance of lithium-ion batteries, and it needs to have good electrochemical and thermodynamic stability and relatively high specific capacity. In recent years, Li, which belongs to the polyanionic cathode material 3 V 2 (PO 4 ) 3 It has attracted widespread attention for its remarkable characteristics such as rich material sources, high specific capacity, good cycle performance and safety performance, and is one of the cathode materials for lithium-ion batteries with great application potential. [0003] Li 3 V 2 (PO 4 ) 3 The preparation methods mainly include high-temperature solid-phase method, carbothermal reduction method, sol-gel method, etc. Among them, the synthesis temperature of high-temperature solid-phase method and carbothermal re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587
CPCY02E60/12Y02E60/10
Inventor 戴长松刘元龙陈振宇刘正胡信国
Owner HARBIN INST OF TECH
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