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Preparation method of material of negative electrode of lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of lower initial charge and discharge, low initial charge and discharge efficiency of graphite materials, side reactions, etc., and achieve weakening of P-type doping , Improve the first charge and discharge efficiency, reduce the concentration effect

Active Publication Date: 2015-10-21
HENAN ZHONGLIAN GAOKE NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is simple and easy to operate, but when this scheme uses organic acids to prepare micro-expanded graphite, it is easy to cause the problem of low initial charge and discharge efficiency of graphite materials. The reason may be the excess hydroxyl or carboxyl groups on the graphite surface and their polymer residues. It is easy for the electrolyte to have side reactions, resulting in a decrease in the first charge and discharge

Method used

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  • Preparation method of material of negative electrode of lithium ion battery
  • Preparation method of material of negative electrode of lithium ion battery
  • Preparation method of material of negative electrode of lithium ion battery

Examples

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Embodiment 1

[0034] The preparation method of the lithium-ion battery negative electrode material of the present embodiment comprises the following steps:

[0035] 1) 10 g of spheroidized flake graphite, 40 g of oxidant hydrogen peroxide, and 20 g of organic acid oxalic acid are mixed, and the particle diameter of the spheroidized flake graphite is D 50 =30 μm, carbon content is 99.96wt%, stirred at 40°C, reacted for 2 hours, washed the obtained mixture with water to pH=6, dried at 80°C to obtain powder A;

[0036] 2) Send powder A into a muffle furnace, raise the temperature to 800°C at a heating rate of 2°C / min, keep it warm for 2 hours, and cool down to room temperature with the furnace to obtain intercalated graphite.

[0037] 3) The intercalation graphite that 5g makes is added in the NaOH solution that concentration is 0.75g / L, and NaOH solution is formulated by NaOH1g, twice distilled water 1330g, and the mass ratio of NaOH and intercalation graphite in NaOH solution is: m NaOH :m ...

Embodiment 2

[0039] The preparation method of the lithium-ion battery negative electrode material of the present embodiment comprises the following steps:

[0040] 1) spheroidized spherical graphite 10g, oxidizing agent hydrogen peroxide 30g, organic acid succinic acid 10g mix, the particle diameter D of this spheroidized spherical graphite 50 = 40 μm, with a carbon content of 99.96 wt%, stirred at 20°C, reacted for 4 hours, washed the obtained mixture with water until pH = 7, and dried at 60°C to obtain powder A;

[0041] 2) Send powder A into a muffle furnace, raise the temperature to 600°C at a heating rate of 1°C / min, keep it warm for 4 hours, and cool down to room temperature with the furnace to obtain intercalated graphite.

[0042] 3) 10g of prepared intercalated graphite is added into the NaOH solution with a concentration of 0.5g / L. The NaOH solution is prepared from NaOH1g and twice distilled water 2000g. The mass ratio of NaOH in the NaOH solution to the intercalated graphite is...

Embodiment 3

[0044] The preparation method of the lithium-ion battery negative electrode material of the present embodiment comprises the following steps:

[0045] 1) 10 g of spheroidized flake graphite, 50 g of oxidant hydrogen peroxide, and 30 g of organic acid adipic acid are mixed, and the particle diameter of the spheroidized flake graphite is D 50 = 50 μm, with a carbon content of 99.96 wt%, stirred at 60°C, reacted for 0.5h, washed the obtained mixture with water to pH = 6, and dried at 100°C to obtain powder A;

[0046] 2) Send powder A into a muffle furnace, raise the temperature to 900°C at a heating rate of 3°C / min, keep it warm for 1h, and cool down to room temperature with the furnace to obtain intercalated graphite.

[0047] 3) 1.0g of prepared intercalated graphite is added into the NaOH solution with a concentration of 1.0g / L. The NaOH solution is prepared from NaOH1g and twice-distilled water 1000g. The mass ratio of NaOH in the NaOH solution to the intercalated graphite i...

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Abstract

The invention relates to a preparation method of a material of a negative electrode of a lithium ion battery, and belongs to the technical field of lithium ion batteries. The method includes the following steps of making graphite, oxidizing agent and organic acid react to obtain intercalated graphite, adding the intercalated graphite to a NaOH solution, and conducting soaking, washing, smashing and spheroidizing to obtain the material. According to the material of the negative electrode of the lithium ion battery, the intercalated graphite is processed through a soaking method, non-graphitic carbon and surface impurities on surfaces of the graphite are reduced, lithium ions consumed by irreversible carbon are reduced, and then the primary charging and discharging efficiency of the graphite is improved.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a lithium ion battery, belonging to the technical field of lithium ion batteries. Background technique [0002] Among the various battery materials used in lithium-ion batteries, the negative electrode material is one of the most important factors affecting battery capacity and cycle performance. At present, the most mature negative electrode materials are graphite materials, including natural graphite, artificial graphite, etc. Among them, natural graphite has been widely used in the field of lithium-ion battery manufacturing due to its good charge and discharge performance and low cost. [0003] However, the interlayer binding energy of natural graphite is only 16.7kJ / mol. During repeated charging and discharging, the graphite layers are easy to peel off, resulting in changes in the structure of the negative electrode material, affecting the normal deintercalation of li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/583
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 付万群李玉峰付世敏
Owner HENAN ZHONGLIAN GAOKE NEW ENERGY
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