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Preparation method of negative active material, negative active material and lithium ion battery

A negative electrode active material and negative electrode material technology, applied in the field of preparation of negative electrode active materials, can solve the problems of improving battery capacity and cycle performance, and achieve the effect of improving capacity and cycle performance, and fine particles

Active Publication Date: 2014-04-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem that the graphite-tin composite material prepared in the prior art improves battery capacity and cycle performance, the invention provides a method for preparing a negative active material, and the negative active material prepared by this method can significantly improve Battery capacity and cycle performance

Method used

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  • Preparation method of negative active material, negative active material and lithium ion battery
  • Preparation method of negative active material, negative active material and lithium ion battery
  • Preparation method of negative active material, negative active material and lithium ion battery

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preparation example Construction

[0032] The preparation method of the negative electrode active material disclosed in the present invention comprises:

[0033] a. Blending the aqueous solution of graphite, organic polymer and tin-containing compound to obtain a mixed system;

[0034] B, under the condition of stirring, add complexing agent in described mixing system;

[0035] c. Adding a reducing agent to the product of step b to react, and then filtering, washing and drying to obtain a negative electrode active material.

[0036] According to the present invention, the above-mentioned graphite can be selected from graphite materials known in the art, and preferably, spherical graphite or flake graphite can be selected. The organic polymer can also adopt various organic polymers commonly used in the art, for example, the organic polymer is selected from asphalt, polyoxyethylene-polyoxypropylene-polyoxyethylene, polyvinylidene fluoride, polytetrafluoroethylene One or more of, preferably polyoxyethylene-polyo...

Embodiment 1

[0068] This example is used to illustrate the preparation method of the negative electrode active material disclosed in the present invention.

[0069] Mix 50g of graphite with the organic polymer polyoxyethylene-polyoxypropylene-polyoxyethylene (P123) at a mass ratio of 10:1, and take 21.5g of SnCl 4 Dissolve in water to make 400ml of solution, add to the above mixture and mix and stir, put the mixture in a volumetric flask, put it in a water bath and heat up to 85°C, take 20.5g of citric acid and deionized water to make a 250ml solution, and Slowly drop into the volumetric flask, then take 60g of sodium borohydride and add deionized water to make a 250ml solution, slowly drop into the volumetric flask, stir at a constant temperature of 85°C for 2h, filter and dry the reacted solution at 80°C Sample A1 was obtained after vacuum drying for 12 hours.

Embodiment 2

[0071] This example is used to illustrate the preparation method of the negative electrode active material disclosed in the present invention.

[0072] Blend 500g of sulfuric acid with a concentration of 98% and 50g of graphite, heat to 85°C, stir for 3 hours, wash and filter the solution, dry at 60°C for 12 hours, mix the acidified graphite with organic polymer P123, the mass ratio is 10:1, take 21.5g of SnCl at the same time 4 Dissolve in water to form a 400ml solution, add it to the above mixture, mix and stir, put the mixture in a volumetric flask, put it in a water bath, and raise the temperature to 85°C, take 28g of citric acid and deionized water to form a 250ml solution, and slowly Drop into the volumetric flask, then take 60g of sodium borohydride and add deionized water to form a solution of 250ml, slowly drop into the volumetric flask, stir at a constant temperature of 85°C for 2h, filter and dry the reacted solution at 80°C Sample A2 was obtained after vacuum dryi...

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Abstract

Methods of preparing negative active materials and negative active materials are provided herein. The preparation methods include: A) mixing a carbon material, an organic polymer, a Sn-containing compound—optionally with water—to obtain a mixed solution system; B) adding a complexing agent into the mixed solution system obtained in step A optionally while stirring to form an intermediate solution; C) adding a reducing agent into the intermediate solution obtained in step B to a reaction product; D) optionally filtering, washing and then drying the reaction product to obtain the negative active material.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode active material, a negative electrode material and a lithium ion battery. Background technique [0002] Lithium secondary batteries are currently used as the main power supply for mobile communication devices and portable electronic devices. At the same time, due to their excellent performance in high output voltage and high energy density, they have become a research hotspot at home and abroad. In a secondary battery, dendrites are deposited on the negative electrode during charging, and as a result of repeated charging and discharging, the dendrites break through the separator and reach the positive electrode, causing a short circuit inside the battery. In this regard, carbon materials that can reversibly react with lithium ions are used as anode materials to replace lithium metal. Generally, lithium ions are reversibly intercalated and deintercalated from carbon materials without...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/48H01M10/0525
CPCH01M4/587C04B35/532H01M10/0525H01M4/387C04B2235/3279H01M4/1393C04B2235/3272C04B2235/3409H01M4/134C04B2235/3284H01M4/133C04B2235/425C04B2235/448H01M4/1391C04B2235/3217H01M4/1395H01M4/366C04B2235/444C04B2235/3275C04B2235/3293C04B2235/3241C04B35/63488H01M4/131Y02E60/122Y02E60/10H01M4/04H01M4/36
Inventor 王强张路马丽朱燕吴振悦
Owner BYD CO LTD
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