Phosphate-based anode composite material of Li-ion battery and preparation method and functions thereof

A technology of composite materials and ion batteries, which is applied in the field of lithium-ion batteries and electrode materials, and can solve problems such as poor cycle life, unstable lattice structure, and low voltage platform

Active Publication Date: 2013-06-19
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, lithium nickel oxide, lithium nickel cobalt oxide, lithium nickel cobalt manganese oxide ternary materials, and lithium nickel cobalt aluminum oxide materials all belong to the lamellar structure, the lattice structure is unstable, easy to generate oxygen, the safety is poor, and the cost is high. Seriously affect the practical application; the reversible capacity of lithium manganate is low, actually only about 110mAh / g, and the volume specific capacity is lower. Poor life; lithium iron phosphate has good cycle stability, good safety, and high reversible capacity, but its voltage platform is low, and the tap density is low, resulting in low volume and weight specific capacity, and a very flat voltage platform It is more difficult to monitor the power level of the battery

Method used

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  • Phosphate-based anode composite material of Li-ion battery and preparation method and functions thereof
  • Phosphate-based anode composite material of Li-ion battery and preparation method and functions thereof
  • Phosphate-based anode composite material of Li-ion battery and preparation method and functions thereof

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preparation example Construction

[0103] Preparation of cathode composite materials for phosphate-based lithium-ion batteries

[0104] The lithium source material, manganese source material, iron source material, vanadium source material, phosphate source material, carbon source material and equipment required in the preparation method of the invention can all be purchased in the market. For experimental methods that do not indicate specific conditions, usually follow the conventional conditions or the conditions suggested by the manufacturer. For example, the precursor processing equipment is: high-energy ball mill, stainless steel tank and stainless steel ball; in the argon-hydrogen mixture, the hydrogen content is 0-10%, and the impurity content is less than 0.01%; the ball mill adopts a planetary ball mill, stainless steel ball and tank, the ball diameter 10mm, dry grinding process, etc.

[0105] LiMn described in the present invention 1-x Fe x PO 4 and Li 3 V 2 (PO 4 ) 3 The recombination method o...

Embodiment 1

[0154] Example 1 Preparation of Phosphate-Based Lithium-ion Battery Positive Electrode Composite Material 1

[0155] a, get lithium dihydrogen phosphate, manganese carbonate, iron oxalate, ammonium metavanadate, sucrose as raw material, take by weighing raw material by lithium, manganese, vanadium, phosphorus, carbon element molar ratio is 1.10: 0.95: 0.1: 1.10: 1.57, After pre-mixing in a mortar, add absolute ethanol as a dispersant, and put it in a high-energy ball mill for 4 hours to prepare the precursor.

[0156] b. Put the precursor of step a into a tube furnace, heat up at a heating rate of 5°C / min, feed argon-hydrogen mixture, heat up to 350°C and roast for 8 hours;

[0157] c. Take out the product of step b and place it in a planetary ball mill for ball milling without adding dispersant, at a speed of 400 r / min, and the ball milling time is 2 hours.

[0158] d. Put the mixture in step c into a tube furnace, raise the temperature at a heating rate of 5°C / min, feed arg...

Embodiment 2

[0162] Example 2 Preparation of Phosphate-Based Lithium-ion Battery Positive Electrode Composite Material 2

[0163] a. Get lithium dihydrogen phosphate, manganese carbonate, iron oxalate, ammonium metavanadate, and glucose as raw materials, and the molar ratio of lithium, manganese, iron, vanadium, phosphorus, and carbon is 2.00: 0.40: 0.10: 1.00: 2.00: 2.15 Weigh the raw materials, put them in a mortar and pre-mix them evenly, add absolute ethanol as a dispersant, put them in a high-energy ball mill for 4 hours to prepare the precursor.

[0164] b. Put the precursor of step a into a tube furnace, heat up at a heating rate of 10°C / min, feed high-purity argon, heat up to 450°C and roast for 8 hours;

[0165] c. The product of step b is taken out and placed in a planetary ball mill for ball milling without adding dispersant at a rotational speed of 500 r / min, and the ball milling time is 5 hours.

[0166] d. Put the mixture in step c into a tube furnace, raise the temperature ...

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Abstract

The invention relates to a phosphate-based anode composite material of a Li-ion battery and a preparation method of the composite material and functions of the composite material, and particularly discloses the phosphate-based anode composite material of the Li-ion battery. The composite material has a lattice structure of LiMn1-xFexPO4 and a lattice structure of Li3V2(PO4)3. The chemical formula of the composite material is yLiMn1-xFexPO4-(1-y)Li3V2(PO4)3 / C, wherein x is 0.00-0.40, y is 0.50-0.95, and C is a carbon layer. The preparation method and the functions of the composite material are also disclosed. The composite material has the advantages of having a high potential plateau with voltage of 4.1V, being high in reversible capacity and good in cycling stability, having an electric quality warning function, and being low in cost, environment-friendly and the like.

Description

technical field [0001] The invention belongs to the field of electrode materials, in particular to the field of lithium ion batteries, in particular to a lithium ion battery phosphoric acid-based positive electrode composite material and its preparation method and application. Background technique [0002] Lithium-ion battery is a very good battery system. With the continuous advancement of science and technology, people's demand for mobile energy is becoming stronger and stronger. The continuous development of new energy is an important basis for the sustainable development of human beings. Since the commercialization of lithium-ion batteries in the early 1980s, they have been widely used in portable electronic devices such as mobile phones, notebook computers, and small cameras because of their high voltage, high specific energy, long cycle life, and no environmental pollution. . It can also replace traditional non-renewable resources such as oil and natural gas, and is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCY02E60/10
Inventor 王辰云唐元昊毕玉敬王德宇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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