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Hard carbon negative electrode material of lithium ion battery, preparation method and application of hard carbon negative electrode material

A lithium-ion battery and anode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of insignificant increase in specific capacity, poor compatibility of graphite, cumbersome preparation methods, etc., and achieve excellent cycle performance, compatibility Good performance, the effect of improving the first Coulombic efficiency

Inactive Publication Date: 2012-12-12
天津市贝特瑞新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method is complex and the specific capacity is not significantly improved.
CN101887966A discloses a lithium-ion battery composite hard carbon negative electrode material and its preparation method, in order to improve the first coulombic efficiency of the lithium-ion battery composite hard carbon negative electrode material, the preparation method includes adding and curing the hard carbon matrix precursor (ie thermoplastic resin) agent and dopant are solidified as carbon source, pyrolyzed to form a hard carbon matrix, and then coated with a coating precursor on the hard carbon matrix, and pyrolyzed to form a coating, the prepared lithium-ion battery composite hard carbon negative electrode The material has the advantages of high capacity, high first Coulombic efficiency, and high rate, but its preparation method is relatively cumbersome and the cycle is long
When PC is used in secondary Li-ion battery, it cannot be used in Li + The SEI film is formed on the graphite negative electrode before embedding, which will + The graphite structure is co-embedded, and the reduction and decomposition reaction occurs to destroy the graphite structure, and the compatibility with graphite is poor

Method used

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  • Hard carbon negative electrode material of lithium ion battery, preparation method and application of hard carbon negative electrode material
  • Hard carbon negative electrode material of lithium ion battery, preparation method and application of hard carbon negative electrode material
  • Hard carbon negative electrode material of lithium ion battery, preparation method and application of hard carbon negative electrode material

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Effect test

Embodiment 1

[0037] Example 1 Preparation of hard carbon anode materials for lithium-ion batteries

[0038] The preparation of lithium ion battery hard carbon negative electrode material comprises the following steps:

[0039] 1) Weigh 20g of phenolic resin, add it into 100ml of absolute ethanol, dissolve it fully, and obtain the ethanol solution of phenolic resin;

[0040] 2) Add 2g of nano-silicon liquid and 2g of phosphoric acid into the phenolic resin solution prepared in step 1), and stir mechanically to make it evenly mixed to obtain a mixed solution;

[0041] 3) Filter the mixed solution prepared in step 2), take the filtrate, place it in a drying oven, and keep it at 95°C for 4 hours for drying to obtain a reactant precursor;

[0042] 4) Take out the precursor of the reactant, put it into a tube furnace, and under the protection of nitrogen, raise the temperature to 350°C at a heating rate of 2° / min, keep it warm for 2 hours, perform preheating treatment, and then ...

Embodiment 2

[0044] Example 2 Preparation of hard carbon anode materials for lithium-ion batteries

[0045] The preparation of lithium ion battery hard carbon negative electrode material comprises the following steps:

[0046] 1) Weigh 50g of phenolic resin, 5g of nano-silicon liquid and 10g of phosphorus pentoxide, put the three into a ball mill jar, and ball mill for 3 hours at a speed of 280r / min to make them evenly mixed to obtain a precursor mixture;

[0047] 2) Put the precursor mixture into a tube furnace, under the protection of nitrogen, raise the temperature to 350°C at a heating rate of 2° / min, keep it warm for 2 hours, perform preheating treatment, and then raise the temperature to 350°C at a heating rate of 2° / min 950°C, carbonization for 3 hours, and naturally cooled to room temperature;

[0048] 3) The carbonized material is taken out and ground to obtain a hard carbon negative electrode material for lithium-ion batteries.

Embodiment 3

[0049] Example 3 Preparation of hard carbon anode materials for lithium-ion batteries

[0050] The preparation of lithium ion battery hard carbon negative electrode material comprises the following steps:

[0051] 1) Weigh 30g of epoxy resin, add it to 100ml of absolute ethanol, fully dissolve, and obtain an ethanol solution of epoxy resin;

[0052] 2) Add 2.5g of silicone resin and 3g of ammonium phosphate to the epoxy resin solution prepared in step 1), and stir mechanically to make it evenly mixed to obtain a mixed solution;

[0053] 3) Filter the mixed solution, take the filtrate, place it in a drying oven, and keep it at 100°C for 4 hours for drying to obtain a dry reactant precursor;

[0054] 4) Take out the dry reactant precursor, put it into a tube furnace, and under the protection of nitrogen, raise the temperature to 350°C at a heating rate of 2° / min, keep it warm for 2 hours, and perform preheating treatment, and then heat it at a heating rate of 2°...

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Abstract

The invention relates to a hard carbon negative electrode material of a lithium ion battery, and a preparation method and application of the hard carbon negative electrode material. The hard carbon negative electrode material is doped with silicon and phosphorus, wherein the mass ratio of silicon precursor, phosphorus precursor and hard carbon precursor is 1:(0.1 to 5):(5 to 30). Due to the addition of silicon / phosphorus, the hard carbon negative electrode material provided by the invention is remarkably improved in the first discharge capacity (up to 550.8mAh / g), the first charge / discharge efficiency (up to 80.9%) and the first coulombic efficiency by doping, is remarkably reduced in the irreversible capacity, and has the advantages of excellent cycle performance and rate capability, good PC (poly carbonate) consistency and high PC resistance, wherein the capacity retention ratio is above 95% after discharge cycle for 100 weeks at a high discharge rate of 10C.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, and in particular relates to a hard carbon negative electrode material for lithium ion batteries, a preparation method and applications thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, large specific energy, and good safety performance. They are widely used in mobile communications, notebook computers, and large-scale energy storage. They will also be used in electric vehicles, hybrid vehicles, military equipment, aerospace , national defense industry, space technology and other fields have broad application prospects. [0003] As anode materials, graphite materials have the advantages of high cycle efficiency, good cycle performance, low lithium intercalation / deintercalation potential, suitable reversible capacity, abundant resources, and low price, making them ideal anode materials for lithium-ion batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/583
CPCY02E60/12Y02E60/10
Inventor 杨红强苗艳丽张俊平李花
Owner 天津市贝特瑞新能源科技有限公司
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