Anode material and manufacturing method thereof as well as lithium ion battery and negative plate thereof

A lithium-ion battery and negative electrode material technology, applied in the field of battery technology and new energy materials, can solve problems such as poor cycle performance, structural damage, capacity attenuation, etc., achieve high specific capacity, prevent secondary agglomeration, and reduce capacity loss Effect

Active Publication Date: 2012-01-25
SHENZHEN DANBANG INVESTMENT GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the structural damage caused by the severe volume expansion and contraction during charge and discharge, the capacity decays rapidly and the cycle performance is poor, so tin cannot be directly used as the negative electrode of lithium-ion batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 (1) 10 g of graphite (selected from commercially available finished products, preferably with a particle size of less than 50 mesh and a tap density greater than 1.2g / cm 3) and 5 g of sodium nitrate into the flask, inserting non-carbonaceous sodium ions between the graphite layers to form graphite intercalation complexes, weakening the interlayer force, adding 800 ml while stirring in an ice-water bath Concentrated sulfuric acid, then slowly add 50 g of potassium permanganate, stir in an ice bath for 2 hours, then warm up to room temperature, and continue to stir for 24 hours; add 30 ml of 30% hydrogen peroxide to reduce the residual oxidant, stir for 2 hours, and then use the concentration Wash with 3% dilute sulfuric acid, filter with suction, and dry to obtain graphite oxide.

[0030] (2) Take 1 g of the prepared graphite oxide and disperse it in 1 L of deionized water, and ultrasonically peel it off for 30 min to obtain a graphene oxide colloidal solution,...

Embodiment 2

[0036] (1) Same as step (1) in Example 1.

[0037] (2) Take 1 g of the prepared graphite oxide and disperse it in 1 L of deionized water, ultrasonically strip it for 30 min to obtain a graphene oxide colloidal solution, then add 10 ml of hydrazine hydrate, stir and react in a water bath at 100°C for 24 hours, wash and separate and drying to obtain a graphene powder, and dispersing the graphene powder in ethylene glycol to obtain a graphene dispersion.

[0038] (3) Dissolve 6 g of tin sulfate and 2.5 g of sodium hydroxide in 50 ml of deionized water, and under vigorous stirring, drop the sodium hydroxide solution into the tin sulfate solution at a rate of 1 ml / min to form hydroxide Tin colloid solution.

[0039] (4) Add the graphene dispersion obtained in step (2) to the tin hydroxide colloidal solution in step (3), control the mass ratio of graphene to tin hydroxide to 1:1, sonicate for 3 hours, drop After 2-3 drops of polyacrylic acid, wash, centrifuge, and dry to obtain ti...

Embodiment 3

[0043] (1) Same as step (1) in Example 1.

[0044] (2) Take 1 g of the prepared graphite oxide and disperse it in 1 L of deionized water, and ultrasonically peel it off for 30 min to obtain a graphene oxide colloidal solution. Then add 10 ml of formaldehyde, stir and react in a water bath at 100°C for 24 hours, wash, separate, and dry to obtain graphene powder, and disperse the graphene powder in ethylene glycol to obtain a graphene dispersion.

[0045] (3) Dissolve 10 g of tin chloride pentahydrate and 2.5 g of sodium hydroxide in 50 ml of deionized water, and drop the sodium hydroxide solution into the tin chloride solution at a rate of 1 ml / min under vigorous stirring , forming tin hydroxide colloidal solution.

[0046] (4) Add the graphene dispersion obtained in step (2) to the tin hydroxide colloidal solution in step (3), control the mass ratio of graphene to tin hydroxide to 3:7, ultrasonicate for 3 hours, drop Wash after 2-3 drops of polyacrylamide, centrifuge filter ...

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Abstract

The invention discloses an anode material which comprises a stack layer of graphene sheets and tin metal particles, wherein the tin metal particles are embedded into the graphene sheets or distributed among the graphene sheets. The invention also discloses a manufacturing method of the anode material, and the manufacturing method comprises the following steps of: directly reducing tin hydroxide on the graphene sheets by adopting a one-step total heating reduction method to obtain the tine metal particles; and baking to obtain a tin-graphene composite material. The invention also discloses a lithium ion battery, and the negative electrode of the lithium ion battery is manufactured by using the lithium ion battery anode material. The lithium ion battery anode material is high in specific capacity, the first-time discharge capacity can reach 600-900 mAh / g, and the capacity can reach 550-820 mAh / g when the discharge is stable; the cycle life of the lithium ion battery anode material is long, and the number of cycles can reach over 1,000; and the lithium ion battery anode material is simple in preparation process, and is suitable for industrial production.

Description

technical field [0001] The invention relates to battery technology and new energy materials, in particular to a negative electrode material and a preparation method thereof, a lithium ion battery and a negative electrode sheet thereof. Background technique [0002] Carbon materials are currently the most widely used lithium storage materials due to their low electrochemical potential and good cycle performance. The field of application is limited. In recent years, researchers have been looking for new lithium storage materials that can replace carbon anode materials. The research mainly focuses on metals, alloys and related compounds. Among them, alloy-based anode materials are considered to be the most promising "fourth-generation lithium-ion battery". negative electrode material". [0003] The tin-based anode in the alloy system has received extensive attention due to its high relative specific capacity, especially the high volume specific capacity, which is more than th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/139H01M4/13H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 刘萍
Owner SHENZHEN DANBANG INVESTMENT GROUP
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