Method for preparing biochar/ammonium vanadate lithium ion cell cathode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficult control of the reaction process, low product purity, high reaction temperature, etc., and achieve improved cycle stability, low reaction temperature, and synthesis The effect of low temperature

Active Publication Date: 2015-06-10
珠海东杰科技有限公司
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Problems solved by technology

However, the precipitation method synthesizes NH 4 V 3 o 8 There are disadvantages such as the reaction process is not easy to control, side reactions occur, and the product purity is low. The hydrothermal method synthesizes NH 4 V 3 o 8 There are disadvantages such as relatively high reaction temperature and long reaction time
And ammonium vanadate has poor conductivity due to its low conductivity.

Method used

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  • Method for preparing biochar/ammonium vanadate lithium ion cell cathode material
  • Method for preparing biochar/ammonium vanadate lithium ion cell cathode material
  • Method for preparing biochar/ammonium vanadate lithium ion cell cathode material

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preparation example Construction

[0038] A preparation method of biological carbon / ammonium vanadate lithium ion battery cathode material, comprising the following steps:

[0039] (1) Wash the biomass prefabricated body (biomass prefabricated body is one of banana peel, shrimp shell, sycamore leaf, wheat straw or corn straw) to remove surface impurities, and cut it into pieces with a side length of 4-6mm Uniform block A;

[0040] (2) Dry the uniform block A at room temperature for 0.5-1 hour to obtain block B;

[0041] (3) Add the concentration of 2~5mol·L to block B -1 Carry out homogeneous reaction after the concentrated nitric acid, the condition of homogeneous reaction is: be heated up to 150 ℃~180 ℃ with the heating rate of 15 ℃ / min, keep warm for 20~50min, then naturally cool to room temperature, obtain reaction product C;

[0042](4) After the reaction product C is suction filtered and dried, it is moved into a tube-type atmosphere furnace for carbonization. The tube-type atmosphere furnace is fed wit...

Embodiment 1

[0049] (1) the sycamore leaves are washed to remove surface impurities, and shredded to obtain uniform block A with a side length of 4 mm;

[0050] (2) Dry the uniform block A at room temperature for 0.5h to obtain block B;

[0051] (3) Add the concentration of 2mol L to block B -1 After the concentrated nitric acid was added, the temperature was raised to 150°C at a heating rate of 15°C / min, and then kept for 20 minutes, and then naturally cooled to room temperature to obtain the reaction product C;

[0052] (4) After the reaction product C is suction filtered and dried, it is moved into a tubular atmosphere furnace for carbonization. The tubular atmosphere furnace is fed with nitrogen. The carbonization conditions are: heat the tubular atmosphere furnace to 50°C in 10 minutes, and raise the temperature to 600°C in 75 minutes. After heat preservation for 180min, the carbonized product D was obtained;

[0053] (5) Soak the carbonized product D in ethanol, then wash three tim...

Embodiment 2

[0059] (1) Wash the wheat stalks to remove surface impurities, and shred them to obtain uniform block A with a side length of 6 mm;

[0060] (2) Dry the uniform block A at room temperature for 1 hour to obtain block B;

[0061] (3) Add concentration of 5mol L to block B -1 After the concentrated nitric acid was added, the temperature was raised to 180°C at a heating rate of 15°C / min, and then kept at 180°C for 50 minutes, and then naturally cooled to room temperature to obtain reaction product C;

[0062] (4) After the reaction product C is suction filtered and dried, it is moved into a tubular atmosphere furnace for carbonization. Nitrogen is introduced into the tubular atmosphere furnace. The carbonization conditions are as follows: heat the tubular atmosphere furnace to 50°C in 10 minutes, and raise the temperature to 800°C in 75 minutes. After the heat preservation for 60min, the carbonized product D was obtained;

[0063] (5) The carbonized product D is soaked in ethano...

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Abstract

The invention discloses a method for preparing a biochar/ammonium vanadate lithium ion cell cathode material. The method comprises the steps of cleaning and cutting a biomass preformed body into pieces, drying the biomass preformed body, and adding concentrated nitric acid for homogeneous reaction, so that a reaction product is obtained; conducting suction filtration and drying on the reaction product, and carbonizing the reaction product in a tubular atmosphere oven, so that a carbonized product is obtained; conducting washing and suction filtration on the carbonized product, and drying the carbonized product, so that porous biochar is obtained; finally, adding biochar into a NH4VO3 solution obtained from deionized water by means of ammonium metavanadate, and placing the mixture in a hydrothermal induction heater, so that the biochar/ammonium vanadate lithium ion cell cathode material is obtained. The obtained biochar/ammonium vanadate composite material has excellent conductivity, and specific capacity and stability are also improved remarkably. The preparing method is simple, reaction temperature is low, reaction time is short, subsequent processing is not needed, environmental friendliness is realized, and large-scale production can be achieved with the method.

Description

technical field [0001] The invention belongs to the field of preparation of positive electrode materials of lithium ion batteries, and in particular relates to a preparation method of biological carbon / ammonium vanadate lithium ion battery positive electrode materials. Background technique [0002] Oxyvanadate and vanadate lithium intercalation materials have become research hotspots in recent years due to their relatively low cost, simple synthesis method, and high specific capacity. As an important class of vanadate, ammonium vanadate nanomaterials have a layered structure composed of vanadyl oxypolyhedra. Among them, NH 4+ It is located between the layers formed by the vanadium-oxygen polyhedron, which makes it have an open structure capable of intercalating metal ions and the characteristics of thermally induced phase transition. Therefore, ammonium vanadate usually has good electrical conductivity and high theoretical specific capacity, and is expected to become a new ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/1393
CPCY02E60/10
Inventor 黄剑锋李瑞梓李嘉胤曹丽云许占位曹杉杉李文斌李多郭强李豆豆仵婉晨
Owner 珠海东杰科技有限公司
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