Layered lithium-rich manganese oxide positive electrode material as well as preparation method and application thereof
A technology of positive electrode materials and oxides, which is applied in the field of layered lithium-rich manganese oxide positive electrode materials and its preparation, can solve the problems of reducing the electrochemical capacity of electrode materials and the modification effect is not obvious, and achieve the purpose of suppressing the spinel phase Formation, inhibition of capacity/voltage fading, strong controllability
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[0030] The first aspect of the present invention provides a method for preparing a layered lithium-rich manganese oxide positive electrode material, comprising the following steps: during the preparation of the precursor of the layered lithium-rich manganese oxide positive electrode material for a lithium ion battery, adding raw materials for modified materials The precursor is then heat-treated at high temperature to obtain a layered lithium-rich manganese oxide composite positive electrode material.
[0031] In the preparation process of the layered lithium-rich manganese oxide positive electrode material of the lithium ion battery, the present invention adds an excessive amount of Ni element precursor to regulate the structure of the layered lithium-rich manganese oxide positive electrode material, because the Ni element can effectively inhibit the layered lithium-rich manganese oxide The migration of transition metal elements during the cycle of manganese cathode materials ...
Embodiment 1
[0049] Preparation of Excess Ni Doped 0.5Li by Spray Pyrolysis 2 MnO 3 -0.5LiNi 0.33 co 0.33 mn 0.33 o 2 (LNCMO) cathode material:
[0050] By stoichiometric ratio Li, Ni, Co, the acetate of Mn are added to a certain amount of deionized water, adopt mechanical stirring to obtain uniform reaction solution; %) adding nickel acetate into the reaction solution; performing spray pyrolysis on the reaction solution to obtain a precursor. The resulting precursor was heat-treated at 900 °C for 10 hours to obtain excess Ni-doped 0.5Li 2 MnO 3 -0.5LiNi 0.33 co 0.33 mn 0.33 o 2 The positive electrode materials are respectively marked as Ni-0, Ni-2, Ni-4, and Ni-6.
[0051] Mix the LNCMO-Ni positive electrode material and the binder in a certain proportion, and use magnetic stirring for 4 hours to obtain a uniform slurry, and then evenly coat the slurry on an aluminum foil to obtain an electrode material. The characterization battery uses a 2025 button battery, and the assembl...
Embodiment 2
[0056] Preparation of Excess Ni Doped 0.7Li by Spray Pyrolysis 2 MnO 3 -0.3LiNi 0.33 co 0.33 mn 0.33 o 2 (LNCMO-1) cathode material.
[0057] Add Li, Ni, Co, Mn acetate into a certain amount of deionized water according to the stoichiometric ratio, and use mechanical stirring to obtain a uniform reaction solution; then add mole percentages (0, 2, 4, 6mol%) according to Ni respectively Adding nickel acetate into the reaction solution; performing spray pyrolysis on the reaction solution to obtain a precursor. The resulting precursors were heat-treated at 900 °C for 10 hours to obtain excess Ni-doped LNCMO-1 cathode materials, which were respectively marked as Ni-1-0, Ni-1-2, Ni-1-4, Ni-1- 6.
[0058] Electrode material preparation and battery assembly are the same as in Example 1.
[0059] Figure 4 (a) is the cycle performance curve of Ni-1-0, Ni-1-2, Ni-1-4, Ni-1-6 electrode materials. As shown in the figure, increasing the content of Ni element can effectively impro...
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