Low-boron-content lithium-boron alloy electrode material for lithium battery and application

An electrode material, lithium-boron alloy technology, applied in the field of energy batteries, can solve the problems of dendrites, poor safety, pulverization, etc., and achieve the effect of improving the electrochemical window, improving stability, and increasing the specific surface area and

Active Publication Date: 2020-04-28
佛山锂朋新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It mainly solves the problem that the negative metal lithium of the secondary lithium battery is easy to produce dendrites and pulverization during the cycle, resulting in low cycle life and poor safety of the battery.
But it does not involve how to improve the specific capacity of the negative electrode and at the same time improve the cycle life of the product

Method used

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  • Low-boron-content lithium-boron alloy electrode material for lithium battery and application
  • Low-boron-content lithium-boron alloy electrode material for lithium battery and application
  • Low-boron-content lithium-boron alloy electrode material for lithium battery and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Lithium-boron alloy strips with a ratio of Li:B:Mg=88.55:9.9:1.55 are used as raw materials, which are named Li-B-Mg-1 here. Lithium-boron alloy strips are cut into discs with a diameter of d=16 and The obtained mass M=0.0254g.

[0053] Assemble it as a positive electrode and a lithium sheet negative electrode to form a CR2016 button battery, and record the discharge capacity C when it is charged to 0.4V at a constant current density of 1mA / cm2 1 =71.26mAh, C 1 / M to obtain the actual specific capacity C of the lithium-boron alloy b =2805.7mAh / g (see figure 1 ), C b / 3860 to get the active lithium percentage content of this disc is 72.6%, take the average value of the active content of five groups of discs as the active lithium content of this type of lithium-boron alloy material.

[0054] (1) Mix sulfur-carbon composite material (containing 65% sulfur), acetylene black, and polytetrafluoroethylene binder in a mass ratio of 8:1:1, use N-methylpyrrolidone as a dispersa...

Embodiment 2

[0061] Using lithium-boron alloy strips with a ratio of Li:B:Mg=89.85:8.5:1.65 as raw materials, cut the lithium-boron alloy strips into discs with a diameter of d=16 and weigh the obtained mass M=0.0260g

[0062] Assemble it as a positive electrode and a metal lithium negative electrode to form a CR2016 button battery, and record the discharge capacity C when it is charged to 0.4V with a current density of 1mA / cm2. 2 =74.5mAh, C 2 / M to obtain the actual specific capacity C of the lithium-boron alloy d =2865.4mAh / g, C d / 3860 to get the active lithium percentage content of this disc is 74.2%, take the average value of the active content of five groups of discs as the active lithium content of this type of lithium-boron alloy material.

[0063] Commercial LiCoO 2 Powder, acetylene black, and polytetrafluoroethylene binder are mixed evenly at a mass ratio of 8:1:1, and N-methylpyrrolidone is used as a dispersant. After ball milling, the mixture is evenly mixed and coated on ...

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Abstract

The invention relates to the field of energy batteries and relates to a low-boron-content lithium-boron alloy electrode material for a lithium battery and application. The electrode material is prepared from the following components in percentage by mass: 85.01 to 95 % of Li; 4.99 to 9.99% of B; and 0.01 to 5% of M, wherein M is selected from at least one of Au, Ag, Si, Al, Zn, C and Mg. When theelectrode material is used as a lithium battery negative electrode material, the specific capacity of the electrode material is 2700-3400 mAh / g. With the low-boron-content lithium-boron alloy electrode material of the invention adopted, the synchronous improvement of high specific capacity and cycle life is realized.

Description

technical field [0001] The invention relates to the field of energy batteries, in particular to a lithium-boron alloy electrode material with low boron content for lithium batteries and its application. Background technique [0002] In view of the continuous depletion and high pollution of fossil fuels, as well as the increasing demand for smart mobile electronic devices and electric vehicles, the development of high specific energy secondary batteries is of great significance. Since 1991, lithium-ion batteries (LIBs) have been widely used in various fields due to their long cycle life, low self-discharge rate and low safety risk, etc. However, after nearly 30 years of continuous optimization With the development and development, the energy density of traditional lithium-ion batteries is close to its theoretical limit, especially the graphite negative electrode with a theoretical specific capacity of 372mAh g-1. [0003] Lithium metal is considered to be the "Holy Grail" in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/40H01M10/052
CPCH01M4/405H01M10/052Y02E60/10
Inventor 陈立宝青飘刘志坚黄海峰武晨陈月皎
Owner 佛山锂朋新能源有限公司
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