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Novel lithium manganate electrode material

An electrode material, lithium manganate technology, applied in battery electrodes, manganate/permanganate, batteries, etc., can solve the problems of low discharge voltage, poor anti-overcharge performance, unsatisfactory effect, etc., and achieve high conductivity high effect

Inactive Publication Date: 2018-07-06
许明振
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

where LiCoO 2 The anti-overcharge performance of the material is poor, and the specific capacity drops rapidly at a higher charging voltage; the shortcomings of lithium iron phosphate, such as low discharge voltage and low tap density, restrict its further application. 2 o 4 Materials are being widely studied as a new generation of lithium-ion electrode materials. Some literature points out that for LiMn 2 o 4 Components doped with rare earth elements can effectively improve cycle performance and slow down the increase of electrode impedance, but the effect of doping with a single component of rare earth elements is often unsatisfactory. The present invention uses lithium carbonate, electrolytic manganese dioxide, lanthanum acetate, and cerium acetate as The raw material is ground into alloy powder by ball milling process, and then a new type of LiMn doped with rare earths La and Ce is synthesized by solid phase method through calcination process. 2 o 4 Electrode composite material, LiLa after doping rare earth x Ce y mn 2-(x+y) o 4 The comprehensive performance of electrode materials will be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take an appropriate amount of chemically pure lanthanum acetate, cerium acetate, lithium carbonate, and electrolytic manganese dioxide as raw materials, according to LiLa 0.1 Ce 0.2 mn 1.7 o 4 The atomic ratio of ingredients is 5g, and the prepared mixture raw materials are poured into the ball milling tank together, and 100g of steel balls are put into it, and then poured into the acetone solution, after the ball milling tank is immersed, the tank cover is tightly closed, and put into a planetary ball mill for ball milling After ball milling for 40 hours, take out the alloy powder, put it in a flat container to dry, then put the dried powder into a quartz glass tube, and vacuum seal it under the condition of continuous pumping, and put the sealed quartz glass tube Put the tube into water to verify the airtightness. If there are no bubbles, it can be determined that its airtightness is good. Then take out the quartz glass tube, dry the water, and put it in a high-temp...

Embodiment 2

[0021] Take an appropriate amount of chemically pure lanthanum acetate, cerium acetate, lithium carbonate, and electrolytic manganese dioxide as raw materials, according to LiLa 0.2 Ce 0.2 mn 1.6 o 4 The atomic ratio of ingredients is 10g. Pour the mixed raw materials into the ball milling tank together, and put 150g of steel balls into it, then pour in the acetone solution. After immersing the ball milling tank, cover the tank tightly and put it into a planetary ball mill for ball milling. After ball milling for 30 hours, take out the alloy powder, put it in a flat container to dry, then put the dried powder into a quartz glass tube, and vacuum seal it under the condition of continuous pumping, and put the sealed quartz glass tube Put the tube into water to verify the airtightness. If there are no bubbles, it can be determined that its airtightness is good. Then take out the quartz glass tube, dry the water, and put it in a high-temperature furnace at 800 ° C for calcinatio...

Embodiment 3

[0023] Take an appropriate amount of chemically pure lanthanum acetate, cerium acetate, lithium carbonate, and electrolytic manganese dioxide as raw materials, according to LiLa 0.4 Ce 0.2 mn 1.4 o 4 The atomic ratio of ingredients is 20g, and the prepared mixture raw materials are poured into the ball milling tank together, and 200g of steel balls are put into it, and then poured into the acetone solution, after the ball milling tank is immersed, the tank cover is tightly closed, and put into a planetary ball mill for ball milling After ball milling for 30 hours, take out the alloy powder, put it in a flat container to dry, then put the dried powder into a quartz glass tube, and vacuum seal it under the condition of continuous pumping, and put the sealed quartz glass tube Put the tube into water to verify the airtightness. If there are no bubbles, it can be determined that its airtightness is good. Then take out the quartz glass tube, dry the water and put it in a high-temp...

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PUM

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Abstract

The invention relates to a novel lithium manganate electrode material. The electrode material is a rare earth-doped LiLa<x>Ce<y>Mn<2-(x+y)>O<4> electrode material. The preparation method of the electrode material comprises the steps of taking lithium carbonate, electrolytic manganese dioxide, lanthanum acetate and cerium acetate as the raw materials, performing material preparing based on the atomic proportion of LiLa<x>Ce<y>Mn<2-(x+y)>O<4> (x+y is greater than or equal to 0.01 and less than or equal to 0.2), next, performing grinding on the mixture by a ball milling process to obtain alloy micro powder, and then performing drying in the air, and carrying out high-temperature calcining through a calcining process to obtain the electrode material.

Description

technical field [0001] The invention relates to a lithium ion electrode material and a preparation process thereof, in particular to a rare earth-added lithium manganate electrode material and a preparation process thereof, belonging to the field of lithium battery materials. Background technique [0002] With the widespread use of portable digital products, especially the use of mobile phones and notebook computers, portable, high-capacity, rechargeable lithium-ion batteries are being widely used in such products with excellent performance. The original 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. Due to the very active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements. Therefore, lithium battery production must be carried out under special environmental conditions, and the use condit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/485H01M10/0525C01G45/12
CPCC01G45/1242H01M4/485H01M4/505H01M10/0525H01M2220/30Y02E60/10
Inventor 许明振
Owner 许明振