Matched silicon-carbon anode lithium-ion battery electrolyte and silicon-carbon anode lithium-ion battery

A lithium-ion battery and electrolyte technology, which is applied in the field of matching silicon-carbon negative electrode lithium-ion battery electrolyte and silicon-carbon negative electrode lithium-ion battery, can solve the problem of poor long-life cycle performance, large change in volume expansion and internal resistance, and poor battery performance. and other problems, to achieve the effect of inhibiting battery gas production, improving thermal stability, and improving high-temperature storage performance

Active Publication Date: 2016-03-16
DONGGUAN SHANSHAN BATTERY MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The research on the electrolyte of the silicon negative electrode in the above-mentioned literature is mainly based on the half-cell. Although the use of additives in the above-mentioned patents has a certain effect on the improvement of the electrical performance of the silicon negative e

Method used

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  • Matched silicon-carbon anode lithium-ion battery electrolyte and silicon-carbon anode lithium-ion battery
  • Matched silicon-carbon anode lithium-ion battery electrolyte and silicon-carbon anode lithium-ion battery
  • Matched silicon-carbon anode lithium-ion battery electrolyte and silicon-carbon anode lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In a glove box filled with argon (moisture 6 , and stirred until it was completely dissolved to obtain the lithium-ion battery electrolyte of Example 1.

[0044] The lithium-ion battery electrolyte prepared above is injected into the positive electrode active material as lithium cobaltate LiCoO 2 , in the soft pack lithium-ion battery whose negative electrode active material is the silicon carbon negative electrode (silicon content in the silicon carbon negative electrode material accounts for 1% to 30%), the battery after liquid injection is packaged, shelved, formed, aged, secondary packaged, capacity separation and other processes to obtain a silicon-carbon negative electrode lithium-ion battery.

Embodiment 2

[0046] In a glove box filled with argon (moisture 6 , and stirred until it was completely dissolved to obtain the lithium-ion battery electrolyte of Example 2.

[0047] The lithium-ion battery electrolyte prepared above is injected into the positive electrode active material as lithium cobaltate LiCoO 2 , in the soft pack lithium-ion battery whose negative electrode active material is the silicon carbon negative electrode (silicon content in the silicon carbon negative electrode material accounts for 1% to 30%), the battery after liquid injection is packaged, shelved, formed, aged, secondary packaged, capacity separation and other processes to obtain a silicon-carbon negative electrode lithium-ion battery.

Embodiment 3

[0049] In a glove box filled with argon (moisture 6 , and stirred until it was completely dissolved to obtain the lithium-ion battery electrolyte of Example 3.

[0050] The lithium-ion battery electrolyte prepared above is injected into the positive electrode active material as lithium cobaltate LiCoO 2 , in the soft pack lithium-ion battery whose negative electrode active material is the silicon carbon negative electrode (silicon content in the silicon carbon negative electrode material accounts for 1% to 30%), the battery after liquid injection is packaged, shelved, formed, aged, secondary packaged, capacity separation and other processes to obtain a silicon-carbon negative electrode lithium-ion battery.

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PUM

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Abstract

The invention relates to the technical field of the lithium-ion batteries, and in particular relates to a matched silicon-carbon anode lithium-ion battery electrolyte and a silicon-carbon anode lithium-ion battery. The lithium-ion battery electrolyte is composed of a non-aqueous organic solvent, a lithium salt and additives, wherein the additives comprise fluoroethylene carbonate, ethylene sulfite and a borate compound with a M type structure. Compared with the prior art, a SEI film formed on the surface of the electrode is more stable and compact through the synergistic effect produced by the combination use of more than three additives, the physical structure stability and chemical structure stability of the silicon-carbon anode surface are improved, so that the battery has good circulation performance and high-temperature storage performance, and meanwhile, the battery gas production is restrained.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a matching silicon-carbon negative-electrode lithium-ion battery electrolyte and a silicon-carbon negative-electrode lithium-ion battery. Background technique [0002] With the rapid increase in the types and quantities of digital products, new energy vehicles will show a massive growth in the next few years. According to the "Energy Saving and New Energy Vehicle Industry Development Plan", the power battery requires an energy density of 300Wh / Kg by 2020. Development A battery system with high energy density is imperative. The energy density of the negative electrode material is particularly constrained to the battery system. The theoretical gram capacity of the commonly used graphite negative electrode is 372mAh / g, and the products developed in the industry are close to this theoretical value. The theoretical gram capacity of silicon anode can reach 4200mAh / g, whi...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42H01M4/38H01M4/583H01M4/62H01M4/525H01M10/0525
CPCH01M4/386H01M4/525H01M4/583H01M4/625H01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 朱学全周文超郭明
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
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