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High-voltage lithium-ion battery with Si/C composite anode

A lithium-ion battery, silicon-carbon composite technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as limitations, achieve reduced interface impedance, good cycle performance, improve high-temperature cycle performance and high temperature The effect of storage life

Inactive Publication Date: 2017-02-22
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can improve the high-temperature storage performance of lithium-ion batteries to a certain extent, this method is subject to certain limitations.
For example, when the cycle performance and high temperature storage performance are required to be further improved at the same time, the two results will be contradictory

Method used

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Examples

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Embodiment 1

[0039] 1. In the preparation method of the silicon-carbon composite negative electrode high-voltage lithium-ion battery in this embodiment, the coating surface density is determined according to the capacity design of the battery and the capacity of the positive and negative electrode materials. The positive electrode active material was purchased from Peking University Pioneer 4.4V lithium cobalt oxide material; the negative electrode active material was purchased from the silicon carbon negative electrode produced by Shenzhen Beterui (silicon content in the silicon carbon negative electrode material accounts for 1% to 10%).

[0040] The positive electrode preparation steps, the negative electrode preparation steps, the electrolyte preparation steps, the diaphragm preparation steps and the battery assembly steps are described as follows:

[0041] The positive electrode preparation step is: mixing high-voltage positive electrode active material lithium cobaltate, conductive car...

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Abstract

The invention discloses a high-voltage lithium-ion battery with a Si / C composite anode. The high-voltage lithium-ion battery comprises a cathode, an anode as well as a separator and a non-aqueous electrolyte placed between the cathode and the anode, wherein the active substance of the cathode is lithium transition metal oxide; the active substance of the anode is a Si-based substance; the separator is a ceramic separator; the non-aqueous electrolyte comprises a non-aqueous organic solvent, lithium salt and an additive, the additive comprises FEC (fluoroethylene carbonate) and isocyanurate compounds in the mass ratio being (6-36):1. Compared with the prior art, the lithium-ion battery using the electrolyte has excellent normal-temperature cycle performance, high-temperature cycle performance and high-temperature storage life, and the gas output in the high-temperature storage process can be remarkably reduced.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery preparation, in particular to a silicon-carbon composite negative electrode high-voltage lithium-ion battery. Background technique [0002] Lithium-ion battery is the most competitive battery of the new generation, known as "green energy", and is the preferred technology to solve contemporary environmental pollution and energy problems. In recent years, lithium-ion batteries have achieved great success in the field of high-energy batteries, but consumers still expect batteries with higher overall performance, which depends on the research and development of new electrode materials and electrolyte systems. [0003] At present, electronic digital products such as smart phones and tablet computers have higher and higher requirements on the energy density of batteries, making it difficult for commercial lithium-ion batteries to meet the requirements. There are two ways to improve the ener...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0567H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 占孝云仰永军徐朝银张彬万华平乐李
Owner GUANGZHOU TINCI MATERIALS TECH
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