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Modification process of lithium ion battery cathode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low tap density, low discharge voltage, and poor anti-overcharge performance, and achieve easy industrialization and condition control simple effect

Inactive Publication Date: 2016-05-18
李梦思
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, LiCoO 2 The structure is relatively stable, the electrochemical performance is excellent, and it is a relatively mature cathode material that has been commercialized at present, but the anti-overcharge performance of this material is poor, and the specific capacity drops rapidly at a higher charging voltage; lithium iron phosphate is a relatively new cathode material material, which has high safety and low cost, but has disadvantages such as low discharge voltage (3.4V) and low tap density, which restrict its further application. Therefore, the development of composite cathode materials has become the research of cathode materials for lithium-ion batteries. one of the directions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take appropriate amount of chemically pure FeC 2 o 4 2H 2 O. Li 2 CO 3 , NH 4 h 2 PO 4 and Al as raw materials, according to Li 0.99 FeAl 0.01 PO 4 The atomic ratio ingredients are taken out, and 5g of the prepared raw material mixture is taken out and poured into a ball mill jar, and 2g of sucrose and 100g of steel balls are added, and then poured into the acetone solution, after the ball mill jar is immersed, the lid of the jar is tightly closed, and The planetary ball mill is used for ball milling, and the ball milling speed is set at 200r / min. After ball milling for 5 hours, take out the ball mill jar, take out the alloy powder, put it in a flat container to dry, then put the dried powder into a quartz glass tube, and Carry out vacuum sealing, put the sealed glass tube into water, if there is no air bubble, it means the sealing is good, then put the glass tube into a high temperature furnace at 500°C for calcination, after calcination for 15 hours, take it ...

Embodiment 2

[0024] Take appropriate amount of chemically pure FeC 2 o 4 2H 2 O. Li 2 CO 3 , NH 4 h 2 PO 4 and Al as raw materials, according to Li 0.95 FeAl 0.05 PO 4 The atomic proportion of ingredients, 10g of the prepared raw material mixture is poured into a ball mill jar, and 4g of sucrose and 200g of steel balls are added, then poured into the acetone solution, after the ball mill jar is immersed, the lid of the jar is tightly closed, and the The planetary ball mill is used for ball milling, and the ball milling speed is set at 300r / min. After ball milling for 2 hours, take out the ball mill jar, take out the alloy powder, put it in a flat container to dry, then put the dried powder into a quartz glass tube, and Carry out vacuum sealing, put the sealed glass tube into water, if there is no air bubble, it means that the sealing is good, then put the glass tube into a high-temperature furnace at 600°C for calcination, after calcination for 10 hours, take it out and cool it to...

Embodiment 3

[0026] Take appropriate amount of chemically pure FeC 2 o 4 2H 2 O. Li 2 CO 3 , NH 4 h 2 PO 4 and Al as raw materials, according to Li 0.9 FeAl 0.1 PO 4 20g of the prepared raw material mixture is poured into a ball mill jar, and 5g of sucrose and 400g of steel balls are added, then poured into the acetone solution, after the ball mill jar is immersed, the lid of the jar is tightly closed, and the The planetary ball mill is used for ball milling, and the ball milling speed is set at 300r / min. After ball milling for 5 hours, take out the ball mill jar, take out the alloy powder, put it in a flat container to dry, then put the dried powder into a quartz glass tube, and Carry out vacuum sealing, put the sealed glass tube into water, if there is no air bubble, it means that the sealing is good, then put the glass tube into a high-temperature furnace at 700°C for calcination, after calcination for 15 hours, take it out and cool it to get a modified Lithium-ion battery cat...

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PUM

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Abstract

The invention discloses a modification process of a lithium ion battery cathode material. According to the process, firstly, FeC2O4.2H2O, Li2CO3, NH4H2PO4 and Zn are mixed according to a certain proportion and then are contained in a ball-milling tank with a proper amount of sucrose and steel balls, ball-milling is performed under dispersing protection of acetone, powder is aired after ball milling, vacuum sealing is performed, the power is calcined at high temperature, and the lithium ion battery cathode material where Zn is added can be obtained after a calcining reaction. According to the preparation method, condition control is easy, and industrial production can be achieved easily.

Description

technical field [0001] The invention relates to a lithium-ion battery positive electrode material and a modification process, in particular to a method for adding Al element and modifying to prepare a lithium-ion battery positive electrode material, which belongs to the field of batteries. Background technique [0002] Lithium battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. The earliest lithium battery came from the great inventor Edison, using the following reaction: Li+MnO 2 =LiMnO 2， This reaction is a redox reaction. Lithium-ion batteries are widely used in portable appliances and new vehicles due to their advantages such as high specific energy, high working voltage, long cycle life, no memory effect, and no pollution. [0003] In the composition of lithium-ion batteries, the cathode material plays a decisive role in its electrochemical performance, safety performanc...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525C01B25/45
CPCC01B25/45H01M4/5825H01M10/0525Y02E60/10
Inventor 李梦思
Owner 李梦思
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