Lithium battery cathode additive, lithium ion battery, preparation method and uses thereof

An additive and lithium battery technology, applied in the direction of battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problem of single increase in gram capacity or initial efficiency, etc., to reduce adverse effects, increase energy density, and easy to operate Effect

Active Publication Date: 2016-02-24
CALB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, increasing the energy density of negative electrode materials is mostly a single increase in gram capacity or first-time efficiency, and it is difficult to take care of both at the same time. Only by developing a negative electrode material with high gram capacity and high first-time efficiency can the energy density of lithium batteries be greatly improved.

Method used

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  • Lithium battery cathode additive, lithium ion battery, preparation method and uses thereof
  • Lithium battery cathode additive, lithium ion battery, preparation method and uses thereof

Examples

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Effect test

Embodiment 1

[0031] The lithium battery negative electrode additive in this embodiment has a core-shell structure, the inner core is composed of nano-silicon powder, lithium powder composite, and hollow carbon spheres, and the outer shell is mainly composed of carbon nanotubes, sodium dodecylbenzenesulfonate, and NaF; preparation Proceed as follows:

[0032] 1) First, use a three-dimensional mixer to mix 50g of nano-silicon powder, 5g of lithium powder composite (the inner core is 1g of lithium powder, and the outer core is 4g of polymethyl ethyl oxide, the preparation method is the same as that of Example 1 in patent CN103779572A), 60g of hollow carbon The balls were mixed uniformly at the dew point of -60°C to obtain mixture A for later use; at the same time, 10g of carbon nanotubes and 5g of sodium dodecylbenzenesulfonate were added to 100g of carbon tetrachloride solvent, and stirred to mix uniformly to obtain a mixture B standby;

[0033] 2) Add mixture A to mixture B at the dew poin...

Embodiment 2

[0035] The lithium battery negative electrode additive in this embodiment has a core-shell structure, the inner core is composed of nano-silicon powder, lithium powder composite, and hollow carbon spheres, and the outer shell is mainly composed of carbon nanotubes, sodium dodecylbenzenesulfonate, and NaCl; preparation Proceed as follows:

[0036] 1) First, use a three-dimensional mixer to mix 10g of nano silicon powder, 0.1g of lithium powder composite (the inner core is 0.01g of lithium powder, and the outer core is 0.09g of polymethyl methacrylate), and 20g of hollow carbon spheres at a dew point of -50°C Mix evenly under the conditions to obtain mixture A for later use; at the same time, add 20 g of carbon nanotubes and 10 g of sodium dodecylbenzenesulfonate to 100 g of toluene solvent, stir to make it evenly mixed, and obtain mixture B for later use;

[0037] 2) At the dew point of -60°C, add mixture A to mixture B, stir and mix for 3 hours, then heat-treat at 400°C for 1 ...

Embodiment 3

[0039] The lithium battery negative electrode additive in this embodiment has a core-shell structure, the inner core is composed of nano-silicon powder, lithium powder composite, and hollow carbon spheres, and the outer shell is mainly composed of carbon nanotubes, sodium dodecylbenzenesulfonate, and NaCl; preparation Proceed as follows:

[0040] 1) First, use a three-dimensional mixer to mix 70g of nano-silica powder, 10g of lithium powder composite (the inner core is 2g of lithium powder, and the outer core is 8g of polymethyl acrylate), and 80g of hollow carbon spheres at a dew point of -50°C. Obtain mixture A for later use; at the same time, add 5 g of carbon nanotubes and 2.5 g of sodium dodecylbenzenesulfonate to 100 g of tetrahydrofuran solvent, stir to make it evenly mixed, and obtain mixture B for later use;

[0041] 2) Add mixture A to mixture B at a dew point of -60°C, stir and mix for 5 hours, then heat-treat at a temperature of 500°C for 2 hours to evaporate the s...

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Abstract

The invention discloses a lithium battery cathode additive, a lithium ion battery, a preparation method and uses thereof, and belongs to the technical field of lithium secondary battery. The cathode additive is a core-shell structure, wherein the core is composed of nanometer silicon powder, lithium powder compound and hollow carbon spheres, and the shell is composed of carbon nanotubes, surfactants and doping agents; the mass proportion of the nanometer silicon powder, the lithium powder compound and the hollow carbon spheres is 10-70:0.1-10:20-80; the mass proportion of the carbon nanotubes, surfactants, doping agents and nanometer silicon powder is 5-20:2.5-10:0.5-7:10-70; the lithium powder compound is a core-shell capsule constituted by lithium powder and polymer wrapping the lithium powder; the doping agents are sodium chloride and / or sodium fluoride; the surfactants is sodium dodecyl benzene sulfonate. The cathode additive is added to the graphite cathode, thereby obviously promotes gram volume, initial efficiency and circulation performance of the cathode materials and absorbing ability of the cathode plate.

Description

technical field [0001] The invention relates to a lithium battery negative electrode additive, a preparation method and an application of the lithium battery negative electrode additive, and simultaneously the invention also relates to a lithium ion battery, which belongs to the technical field of lithium ion secondary batteries. Background technique [0002] The negative electrode material is the key material for lithium-ion batteries. Currently, the negative electrode materials used in the market are mainly graphite materials, which generally have the problems of low gram capacity (372mAh / g) and low initial efficiency (88% to 95%), which seriously affect the battery. The overall energy density of the play. In order to increase the energy density of lithium-ion batteries, the negative electrode material can be improved from the following two aspects: one is to add silicon and its composites to increase the gram capacity of the negative electrode material, and the other is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/36H01M10/0525H01M10/42
CPCH01M4/13H01M4/134H01M4/1395H01M4/366H01M10/0525H01M10/4235Y02E60/10
Inventor 赵晓锋
Owner CALB CO LTD
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