Lithium-manganese-group-rich composite anode material, preparing method thereof and lithium ion battery
A composite positive electrode material, lithium-rich manganese-based technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of limited rate performance, poor rate performance, complex bulk phase structure, etc., and achieve discharge specific capacity and cycle performance Improvement, magnification performance improvement, good coating effect
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[0046] The invention provides a preparation method of a lithium-rich manganese-based composite positive electrode material, comprising the following steps:
[0047] 1) Prepare 0.1-0.5mol / L metal salt solution and precipitant solution;
[0048] Mix alcohols and deionized water in proportion, and at the same time use 0.1-2mol / L nitric acid to adjust the pH value of the system to the first constant pH value to obtain the first mixed solution;
[0049] 2) Add the metal salt solution and the precipitant solution obtained in the above steps to the first mixed solution at the same time, and the volume ratio of the first mixed solution, the metal salt solution and the precipitant solution is (20~100):1: 1. During the addition process, use nitric acid or ammonia water to adjust the pH value of the system to maintain the first constant pH value, and react for 1 to 5 hours to obtain a suspension;
[0050] 3) Add lithium-rich manganese-based positive electrode materials and carbon nanotu...
Embodiment 1
[0071] Prepare 0.1mol / L Al(NO 3 ) 3 aqueous solution and 0.1mol / L H 3 PO 4 aqueous solution;
[0072] mixing absolute ethanol and deionized water, and simultaneously using 0.1-2 mol / L nitric acid to adjust the pH value of the system to 4.5 to obtain a first mixed solution, wherein the volume fraction of absolute ethanol in the first mixed solution is 70%;
[0073] Al(NO 3 ) 3 aqueous solution and H 3 PO 4The aqueous solution is added to the first mixed solution at the same time, the first mixed solution, Al(NO 3 ) 3 Aqueous solution, H 3 PO 4 The volume ratio of the aqueous solution is 50:1:1. During the addition process, use nitric acid or ammonia water to adjust the pH value of the system to keep it at 4.5, and react for 3 hours to obtain a suspension;
[0074] According to 80 parts by mass of the lithium-rich manganese-based positive electrode material, 5 parts by mass of the metal compound, and 10 parts by mass of the carbon nanotubes, the lithium-rich manganese...
Embodiment 2
[0079] Prepare 0.25mol / L MgSO 4 aqueous solution and 0.5mol / L ammonia solution;
[0080] mixing propanol with deionized water, and simultaneously using 0.1-2 mol / L nitric acid to adjust the pH value of the system to 7 to obtain a first mixed solution, wherein the volume fraction of propanol in the first mixed solution is 60%;
[0081] MgSO 4 The aqueous solution and the ammonia solution are added to the first mixed solution simultaneously, the first mixed solution, MgSO 4 The volume ratio of the aqueous solution to the ammonia solution is 50:1:1. During the addition process, use nitric acid or ammonia water to adjust the pH value of the system to keep it at 7, and react for 5 hours to obtain a suspension;
[0082] According to 70 parts by mass of the lithium-rich manganese-based positive electrode material, 8 parts by mass of the metal compound, and 40 parts by mass of the carbon nanotubes, the lithium-rich manganese-based positive electrode material and the carbon nanotubes...
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