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Li-Mn-Cr ternary composite battery positive electrode material and preparation method thereof

A ternary composite, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low discharge voltage, low tap density, restricted application, etc., and achieve the effect of reducing heat treatment temperature and heat treatment time.

Inactive Publication Date: 2014-12-24
李梦思
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium iron phosphate is a relatively new cathode material, which has high safety and low cost, but has disadvantages such as low discharge voltage (3.4V), low tap density, and has not yet been mass-produced.
The shortcomings of the above-mentioned several positive electrode materials have restricted their further application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take a certain amount of lithium salt (LiAC?2H 2 O, analytically pure) and manganese salts (Mn(AC) 2 ?4H 2 O, analytically pure), chromium salt (Cr(AC) 2 ?4H 2 O, analytically pure), use deionized water to make saturated solutions respectively, and then mix the prepared saturated solutions according to the ratio of Li:Mn:Cr = 1:0.5:0.5, and keep shaking, after mixing evenly, then Slowly add a certain amount of citric acid (C 6 h 8 o 7 ?H 2 O, analytically pure) saturated solution, while adding it, keep shaking it well, then adjust the pH value of the solution to 6.0 with ammonia water, after the adjustment, heat the obtained solution in a water bath under the condition of magnetic stirring, the heating temperature is 50°C, and stir The speed is 100r / min; when a pink gel appears in the solution, stop heating; put the obtained gel directly into a box furnace for drying and dehydration at 100°C for 3 hours; put the dry gel into high temperature and calcinate for 10 ...

Embodiment 2

[0025] Take a certain amount of lithium salt (LiAC?2H 2 O, analytically pure) and manganese salts (Mn(AC) 2 ?4H 2 O, analytically pure), chromium salt (Cr(AC) 2 ?4H 2 O, analytically pure), use deionized water to make saturated solutions respectively, and then mix the prepared saturated solutions according to the ratio of Li:Mn:Cr = 1:0.5:0.5, and keep shaking, after mixing evenly, then Slowly add a certain amount of citric acid (C 6 h 8 o 7 ?H 2 O, analytically pure) saturated solution, while adding it, shake it constantly, then adjust the pH value of the solution to 6.5 with ammonia water, after the adjustment, heat the obtained solution in a water bath under the condition of magnetic stirring, the heating temperature is 55 ° C, stir The speed is 110r / min; when a pink gel appears in the solution, stop heating; put the obtained gel directly into a box furnace for drying and dehydration at 130°C for 4.5 hours; put the dried gel into high temperature for 13 hours, and th...

Embodiment 3

[0027] Take a certain amount of lithium salt (LiAC?2H 2 O, analytically pure) and manganese salts (Mn(AC) 2 ?4H 2 O, analytically pure), chromium salt (Cr(AC) 2 ?4H 2 O, analytically pure), use deionized water to make saturated solutions respectively, and then mix the prepared saturated solutions according to the ratio of Li:Mn:Cr = 1:0.5:0.5, and keep shaking, after mixing evenly, then Slowly add a certain amount of citric acid (C 6 h 8 o 7 ?H 2 O, analytically pure) saturated solution, while adding it, shake it constantly, then adjust the pH value of the solution to 7.0 with ammonia water, after the adjustment, heat the obtained solution in a water bath under the condition of magnetic stirring, the heating temperature is 60 ° C, stir The speed is 120r / min; when a pink gel appears in the solution, stop heating; put the obtained gel directly into a box furnace for drying and dehydration at 150°C for 6 hours; put the dry gel into the high temperature for 15 hours, and th...

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PUM

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Abstract

The invention discloses a Li-Mn-Cr ternary composite battery positive electrode material and a preparation method thereof. The preparation method comprises the following steps: mixing a lithium salt (LiAC) saturated solution, a manganese salt (Mn(AC)2) saturated solution, and a chromium salt (Cr(AC)2) saturated solution according to a ratio of Li to Mn to Cr being 1 to 0.5 to 0.5, ceaselessly shaking, adding a certain quantity of citric acid (C6H8O7) saturated solution to the mixed solution, regulating the pH value of the solution to 6.0-7.0 with ammonium hydroxide, heating the obtained solution in water bath while magnetically stirring, stopping heating until pink gel appears in the solution, directly drying and dehydrating the obtained gel in a box-type furnace at 100-150 DEG C for 3-6h, finally calcining the obtained gel at high temperature for 10-15h, and grinding, thus obtaining the final product.

Description

technical field [0001] The invention relates to a lithium-ion battery ternary composite cathode material and a preparation method thereof, in particular to a polycrystalline lithium-manganese-iron ternary material and a preparation method thereof. Background technique [0002] With the development of science and technology and the improvement of people's material and cultural living standards, people's demand for batteries is increasing, and the requirements for battery performance are also getting higher and higher. Especially with the development of space technology and the demand for military equipment, the rapid development of information and microelectronics industry brings a large number of industrial, civil and medical portable electronic products, the research and development of electric vehicles, and the awareness of environmental protection With the enhancement of the technology, people have more urgent demands for batteries that are small in size, light in weight,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/48
CPCH01M4/485H01M4/505H01M10/0525Y02E60/10
Inventor 李梦思
Owner 李梦思