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Preparation method for novel lithium vanadium phosphate/bamboo charcoal composite cathode material

A composite positive electrode material, lithium vanadium phosphate technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems that cannot completely overcome the shortcomings of lithium vanadium phosphate, achieve the effect of enriching pore size, reducing synthesis time, and improving rate performance

Inactive Publication Date: 2012-01-25
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, none of these measures can completely overcome the shortcomings of lithium vanadium phosphate and achieve the best results.
[0008] The invention provides a brand-new lithium vanadium phosphate / bamboo charcoal composite positive electrode material, which has not been reported in the current literature

Method used

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  • Preparation method for novel lithium vanadium phosphate/bamboo charcoal composite cathode material
  • Preparation method for novel lithium vanadium phosphate/bamboo charcoal composite cathode material
  • Preparation method for novel lithium vanadium phosphate/bamboo charcoal composite cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve vanadium pentoxide, lithium hydroxide, ammonium dihydrogen phosphate and citric acid in a certain amount of deionized water at a molar ratio of 1:3:3:2, stir thoroughly in a water bath at 50°C for 5 hours, and then add activation The final (content is 10%) bamboo charcoal (bamboo joints) (the specific activation process of bamboo charcoal is: dry distillation carbonization (argon protection, carbonization temperature 800 ℃, carbonization time 6 h) after the bamboo charcoal is fully mixed with KOH, the mass ratio is 1 : 4, the microwave activation time is 5 min.), and the water was evaporated until the sol was formed, and the lithium vanadium phosphate precursor was obtained after drying in a vacuum oven at 120 °C for 8 h. The precursor was ground into a mold, pressed into a round cake under a pressure of 4 MPa, then placed in a porcelain boat covered with conductive carbon black (SP) powder, heated in a microwave oven at 640 W for 14 min, and cooled to Take it ...

Embodiment 2

[0030] Dissolve vanadium pentoxide, lithium hydroxide, ammonium dihydrogen phosphate and salicylic acid in a certain amount of deionized water at a molar ratio of 1:2.9:3:2.5, stir thoroughly in a water bath at 55 °C for 5 h, and then add Activated (3% content) bamboo charcoal (bamboo root) (bamboo charcoal activation process is the same as in Example 1), evaporate water to form a sol, and dry in a vacuum oven at 120 °C for 8 h to obtain a lithium vanadium phosphate precursor . The precursor was ground into a mold, then placed in a porcelain boat, covered with SP powder, heated in a 640 W microwave oven for 11 min, cooled to room temperature, taken out and ground to obtain a sample of bamboo charcoal-coated lithium vanadium phosphate.

Embodiment 3

[0032] Dissolve vanadium pentoxide, lithium carbonate, ammonium dihydrogen phosphate, and ascorbic acid in a molar ratio of 1:1.5:3:2 in a certain amount of deionized water, fully stir in a water bath at 50 °C for 5 h, and then add activated (5% content) bamboo charcoal (bamboo diameter) (bamboo charcoal activation process is the same as in Example 1), and evaporate water to form a sol, and dry in a vacuum oven at 120 °C for 8 h to obtain a lithium vanadium phosphate precursor. Grind this precursor into a mold, press it into a round cake under a pressure of 4 MPa, then place it in a porcelain boat, cover it with SP powder, heat it in a microwave oven at 640 W for 15 min, cool it to room temperature, take it out and grind it A sample of bamboo charcoal-coated lithium vanadium phosphate was prepared.

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Abstract

The invention discloses a preparation method for a novel lithium vanadium phosphate / bamboo charcoal composite cathode material. The preparation method comprises the following steps of: uniformly mixing vanadium pentoxide, lithium hydroxide or lithium fluoride or lithium carbonate or lithium acetate, ammonium dihydrogen phosphate or phosphoric acid, salicylic acid or citric acid or ascorbic acid or tartaric acid or sucrose, and bamboo charcoal in proportion; evaporating water in a 50-80 DEG C water bath to form a sol; drying the sol in a vacuum drying oven for 8 hours at 120 DEG C to obtain a lithium vanadium phosphate precursor; cooling the lithium vanadium phosphate precursor to room temperature, grinding the precursor and putting the ground precursor into a die to prepare a cake under a certain pressure; putting the cake into a porcelain boat, and covering conductive carbon black (SP) powder on the cake; heating the cake in a microwave oven for a certain period of time; cooling the cake to room temperature; and taking the cake out, and grinding the cake to obtain a bamboo charcoal coated lithium vanadium phosphate / bamboo charcoal composite material sample, thus forming a bamboo charcoal connected conductive network. When used as a cathode material of a lithium ion power battery, the novel lithium vanadium phosphate / bamboo charcoal composite cathode material has the advantages of high capacity and magnification, long service life, low price and environmental friendliness.

Description

technical field [0001] The invention relates to the field of preparation of electrochemical materials, in particular to a method for preparing a lithium vanadium phosphate / bamboo charcoal composite positive electrode material with high capacity, large rate, long life, low price and environmental protection. Background technique [0002] With the increasing shortage of non-renewable energy and the gradual strengthening of people's awareness of environmental protection, as well as the current problems of global warming and ecological environment deterioration, the development and utilization of new energy is a problem that must be solved for sustainable development. Energy sources include wind energy, solar energy, and tidal energy, which are clean and sustainable resources, and batteries are of great significance as the energy storage and conversion of these energy sources. [0003] At present, there are factors such as safety and instability in commercialized oxide lithium-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/583
CPCY02E60/12Y02E60/10
Inventor 张勇霍庆媛王力臻吕艳张林森
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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