Preparation method of composite positive material with multi-level conductive network of lithium ion battery

A composite cathode material, lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reducing the volume energy density of materials, processing and coating performance, etc., to improve electrochemical performance, easy nucleation, and improved Effects of Conductivity and Structural Stability

Active Publication Date: 2015-05-27
深圳市费特森新能源有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, excessive carbon addition will greatly reduce the volumetric energy density of the material and the processing and coating properties of the material

Method used

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  • Preparation method of composite positive material with multi-level conductive network of lithium ion battery
  • Preparation method of composite positive material with multi-level conductive network of lithium ion battery
  • Preparation method of composite positive material with multi-level conductive network of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh lithium dihydrogen phosphate and manganese powder according to the molar ratio of 1:1. And choose the theoretical target product LiMnPO 4 5 wt% graphite oxide and lithium dihydrogen phosphate are dispersed in deionized water medium, and the concentration of lithium dihydrogen phosphate is 1mol / L. The manganese powder was added into the lithium dihydrogen phosphate solution dispersed with graphite oxide, and the precursor slurry was obtained by mechanical activation liquid phase precipitation after high-energy ball milling for 4 hours. Since graphite oxide is rich in polar functional groups and has good hydrophilicity and delamination properties, the newly formed phosphate precipitation nuclei under mechanochemical action can be adsorbed on graphite oxide sheets to achieve in-situ growth using graphite oxide as a template. This facilitates the subsequent hydrothermal treatment to synthesize LiMnPO composited in situ. 4 / graphene material. Add an appropriate amo...

Embodiment 2

[0028] Select the theoretical target product LiMnPO 4 Graphite oxide and manganese nitrate of mass 2% are dispersed in dehydrated alcohol, and preparation manganese ion concentration is the mixed solution of 2mol / L, puts ultrasonic dispersion 1h behind, obtains the manganese salt solution that is dispersed with graphene oxide; The above-mentioned obtained The manganese salt solution dispersed with graphene oxide and concentrated phosphoric acid (85wt%) were added to the reactor with stirring according to the ratio of the amount of substances Mn:P=1:3, and the temperature was controlled to 40°C for 3 hours to obtain milk turbid liquid, the emulsion obtained above was filtered and washed to obtain the manganese phosphate / graphite oxide precursor. Due to the electrostatic force, Mn ions are adsorbed on the graphene oxide sheets, and phosphoric acid is added to react with Mn ions to produce a precipitation reaction, so that the generated manganese phosphate precipitates on the gra...

Embodiment 3

[0031] Select the theoretical target product LiMnPO 4 Disperse graphite oxide and manganese sulfate with 8% mass in deionized water, prepare a mixed solution with a manganese ion concentration of 1mol / L, and then place it in ultrasonic dispersion for 1h to obtain a manganese salt solution dispersed with graphite oxide; the prepared concentration is 1mol / L NH 4 h 2 PO 4 solution. Add the manganese salt solution dispersed with graphite oxide and the ammonium dihydrogen phosphate solution obtained above into the reactor with stirring according to the ratio of the amount of substances Mn:P-=1:1.02, and at the same time use a concentration of 1mol / L of ammonium aqueous solution to adjust the pH of the reaction feed liquid to 9, control the temperature to 80 ° C for 3 hours to obtain an emulsion, filter and wash the emulsion obtained above to obtain NH 4 PPML 4 / graphite oxide precursor; the resulting NH 4 PPML 4 / The graphite oxide precursor and lithium hydroxide were mixe...

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Abstract

The invention relates to a preparation method of a composite positive material (LiMnPO4 / graphene / carbon) with a multi-level conductive network of a lithium ion battery. The method comprises the following steps of: performing liquid-phase precipitation on at least one component material of LiMnPO4 and graphite oxide to form a composite precursor; mechanically activating the composite precursor and other components in a solvent medium; performing hydrothermal reaction on the activated product for 4 to 20 hours to obtain an in-situ composite lithium manganese phosphate / graphene material; mixing the nano-scale lithium manganese phosphate / graphene material and an organic carbon source; and performing heat treatment on the mixture under the protection of inert atmosphere at 500 to 700 DEG C for 1 to 4 hours to obtain the composite positive material. Primary particles of the material prepared by the method are nanoparticles and distributed uniformly; and the multi-level conductive network is formed among phosphate particles in situ. By the method, the size and the appearance of the positive material can be effectively controlled, and the prepared material has high purity, is crystallized intactly, and has excellent physical performance and high multiplying power cycling performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials for lithium ion batteries, and in particular relates to a LiMnPO with a multi-layer conductive network 4 / Gr / C synthesis method. Background technique [0002] Facing the large-scale and large-scale application requirements of power lithium-ion batteries, cathode materials are the key to improving performance and reducing costs of lithium-ion batteries. Further improving the power density, energy density and safety performance of materials has become the development direction of cathode materials for lithium-ion batteries today. Phosphate cathode material LiMPO represented by lithium iron phosphate 4 With the advantages of high capacity, good safety, environmental friendliness, and rich resources, it has become a new type of positive electrode material for lithium-ion batteries with development and application potential. [0003] LiMnPO 4 With an olivine stru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 曹雁冰胡国荣段建国彭忠东杜柯
Owner 深圳市费特森新能源有限责任公司
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