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Two-dimensional layered lithium nickel phosphate positive electrode material and preparation method

A two-dimensional layered, positive electrode material technology, applied in battery electrodes, secondary batteries, electrical components, etc., can solve the problems of low ion diffusion rate and electronic conductivity, unsatisfactory effect, etc., and achieves simple preparation process and electrical conductivity. Improved, low energy consumption

Inactive Publication Date: 2019-03-29
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] According to the above, the nickel-lithium phosphate material used as the positive electrode material of lithium batteries in the existing scheme has restricted its practical application due to its inherent defects of ion diffusion rate and low electronic conductivity. The current improvement measures mainly focus on nickel-lithium phosphate The surface of the material is coated with conductive carbon material, which improves the conductivity of the lithium nickel phosphate material to a certain extent, but the effect is not ideal

Method used

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  • Two-dimensional layered lithium nickel phosphate positive electrode material and preparation method

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Effect test

Embodiment 1

[0037](1) Use biomass resources as raw materials and ionic liquid as template agent. After mixing, heat it in a water bath at 55°C while stirring with a glass rod for 20 minutes, then transfer it to a polytetrafluoroethylene-lined reactor and pour it into the Ionized water and mixed evenly, then put the reaction kettle into the muffle furnace, heated to 185°C, and reacted at constant temperature for 7 hours. After the reaction, the reaction kettle was cooled to room temperature, and finally filtered, washed and dried to obtain a dark brown carbon product; The biomass resource is glucose; the ionic liquid is 1-butyl-3-methylimidazolium chloride;

[0038] Among them, the mass ratio of biomass resource, ionic liquid and deionized water is 1:4.5:9;

[0039] (2) Put the dark brown carbon product obtained in step (1) into a tubular calcination furnace, and calcine it under an argon atmosphere, remove the template agent, and obtain a carbon material with a two-dimensional layered str...

Embodiment 2

[0046] (1) Using biomass resources as raw materials and ionic liquid as a template, after mixing, heat it in a water bath at 63°C while stirring with a glass rod for 20 minutes, then transfer it to a polytetrafluoroethylene-lined reactor and pour it into Ionized water and mixed evenly, then put the reaction kettle into the muffle furnace, heated to 195°C, and reacted at a constant temperature for 5 hours. After the reaction, the reaction kettle was cooled to room temperature, and finally filtered, washed and dried to obtain a dark brown carbon product; The biomass resource is chitosan; the ionic liquid is l-butyl-3-methylimidazolium hexafluorophosphate;

[0047] Among them, the mass ratio of biomass resource, ionic liquid and deionized water is 1:5.5:11;

[0048] (2) Put the dark brown carbon product obtained in step (1) into a tubular calcination furnace, and calcine it under an argon atmosphere, remove the template agent, and obtain a carbon material with a two-dimensional l...

Embodiment 3

[0055] (1) Use biomass resources as raw materials and ionic liquid as template agent. After mixing, heat it in a water bath at 57°C while stirring with a glass rod for 20 minutes, then transfer it to a polytetrafluoroethylene-lined reactor and pour it into Ionized water and mixed evenly, then put the reaction kettle into the muffle furnace, heated to 188°C, and reacted at constant temperature for 7 hours. After the reaction, the reaction kettle was cooled to room temperature, and finally filtered, washed and dried to obtain a dark brown carbon product; The biomass resource is straw; the ionic liquid is 1-butyl-3-methylimidazolium chloride;

[0056] Among them, the mass ratio of biomass resource, ionic liquid and deionized water is 1:5:11;

[0057] (2) Put the dark brown carbon product obtained in step (1) into a tubular calcination furnace, and calcine it under an argon atmosphere, remove the template agent, and obtain a carbon material with a two-dimensional layered structure...

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Abstract

The invention relates to the field of lithium batteries, and discloses a two-dimensional layered lithium nickel phosphate positive electrode material and a preparation method thereof. The preparationmethod comprises the following steps: (1) taking a biomass resource as a raw material and ionic liquid as a template agent, and performing reacting to prepare a dark brown carbon product; (2) calcining the dark brown carbon product to prepare a carbon material of a two-dimensional layered structure; (3) adding a carbon material, a lithium source, a nickel source, a phosphorus source and a surfactant into deionized water to prepare slurry; (4) carrying out hydrothermal reaction on the slurry and collecting a product; (5) performing the freeze-drying of the product to prepare a two-dimensional layered lithium nickel phosphate precursor; (6) calcining and collecting the precursor to prepare the two-dimensional layered lithium nickel phosphate positive electrode material. The lithium nickel phosphate positive electrode material prepared in the invention takes the carbon material as a skeleton, has good conductivity, greatly improves high-rate stability, and meanwhile, has the advantages ofsimple whole preparation process, low energy consumption, low cost, greenness and environmental protection.

Description

technical field [0001] The invention relates to the field of lithium batteries, and discloses a two-dimensional layered lithium nickel phosphate cathode material and a preparation method thereof. Background technique [0002] With the increasing population and limited earth resources, people are forced to improve the utilization rate of resources. The application of rechargeable batteries is one of the effective ways, thus promoting the research and development of lithium secondary batteries. At the end of the 1980s, people's attention was mainly focused on the lithium secondary battery system with metal lithium and its alloys as the negative electrode. Compared with traditional storage batteries, lithium-ion batteries not only have higher energy, stronger discharge capacity, and longer cycle life, but also have an energy storage efficiency of more than 90%, which has become the mainstream. [0003] The main constituent materials of lithium-ion batteries include electrolyt...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/525H01M4/485H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/5825H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 陈庆曾军堂文奇
Owner CHENDU NEW KELI CHEM SCI CO LTD
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