Preparation method of sodium ion battery polyanionic composite material
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A polyanion type, sodium ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor conductivity and low electrochemical activity
Active Publication Date: 2022-03-18
HARBIN INST OF TECH
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[0007] The present invention aims to solve the technical problems of poor electrical conductivity and low electrochemical activity at high rates of ...
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specific Embodiment approach 1
[0036] DETAILED DESCRIPTION OF THE INVENTION The present embodiment is a method for preparing a sodium ion battery polyanionic composite material, specifically, according to the following steps:
[0037] First, the complexing agent is dissolved in deionized water, then the sodium source, manganese source, chromium source, and phosphate source are added, stirred from 0.5 h to 1 h, then add titanium source, then stand 2 h ~ 3h to expand, Sol;
[0038] The sodium elements in the sodium source, manganese elements in manganese sources, chromium elements in chromium sources, phosphate and titanium elements in the phosphate source in phospologists, in order (3 to 3.2) :( 3 to 3.2) :( 3 ~ 3.2) :( 1-x): x: 3: 1 Perform ratio, X is 0.01 ~ 0.15;
[0039] The ratio of the molar amount of the complexing agent and the molar amount of manganese element, chromium element, and titanium elements are (1 to 2): 1;
[0040] Second, the solution obtained by the step is stirred into the gel shape in a w...
specific Embodiment approach 2
[0043] DETAILED DESCRIPTION OF THE INVENTION Different embodiments of the present embodiment are different: The complexing agent described in step one is a mixture of citric acid, oxalic acid, ascorbic acid and sucrose, and as a carbon source Complexer. Others are the same as specific embodiments.
specific Embodiment approach 3
[0044] BEST MODE FOR CARRYING OUT THE INVENTION 3: The present embodiment is different from that of the particular embodiment: the manganese sources described in the step one are tetrahydrate acetate. Others are the same as those of the specific embodiments.
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Abstract
The invention discloses a preparation method of a polyanionic composite material of a sodium-ion battery, and relates to a preparation method of a positive electrode material of the sodium-ion battery. The invention aims to solve the technical problems of poor conductivity and low electrochemical activity under high magnification of the existing polyanionic phosphate positive electrode material. The preparation method comprises the following steps: dissolving raw materials in deionized water according to a stoichiometric ratio by a sol-gel method, mixing, evaporating to dryness, carrying out vacuum drying, sintering, grinding and sieving to obtain the positive electrode material. In the sintering process, a phosphate positive electrode material with an NASICON lattice structure is formed, chromium ions are used for partial trace doping at a manganese site, and the proportion of manganese in the material is reduced to reduce the ginger-Taylor effect brought by Mn < 3 + >, so that the reversible specific capacity of the positive electrode material can be effectively improved, and the electronic conductivity and the sodium storage performance of the material are greatly improved; and the transmission of sodium ions is promoted, so that the electrochemical performance of the material is improved.
Description
Technical field [0001] The present invention relates to a method of preparing a positive electrode material of a sodium ion battery. Background technique [0002] At present, the energy required to promote modern technology and rapid development is mainly due to non-renewable fossil mineral energy, such as oil, coal, natural gas, etc. However, the excessive consumption of fossil energy and the environmental pollution caused by their combustion, the environmental pollution, energy shortage and environment deterioration are called the core issues that threaten human survival and development, and new energy development has become a major topic that people need to solve. Therefore, human society must achieve sustainable development must address two important issues such as environmental and energy. Battery energy is developed in its high efficiency, low cost, safety, convenience, etc., has become the current main energy storage technology. Conventional lead-acid batteries, nickel-cad...
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