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Silicon-carbon composite anode high-voltage lithium-ion battery

A lithium-ion battery, silicon-carbon composite technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve problems such as limitations, achieve good low-temperature performance, suppress volume effect, and low battery impedance

Inactive Publication Date: 2017-01-04
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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Embodiment 1

[0039] 1. In the preparation method of the silicon-carbon composite negative high-voltage lithium-ion battery in this embodiment, the coating area 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 Xianxing 4.4V lithium cobalt oxide material; the negative electrode active material was purchased from the silicon carbon negative electrode produced by Shenzhen Beiterui (the silicon content in the silicon carbon negative electrode material accounts for 1% to 10%).

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

[0041] The preparation step of the positive electrode is: mix the high-voltage positive electrode active material lithium cobaltate, conductive carbon black and b...

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Abstract

The invention discloses a silicon-carbon composite anode high-voltage lithium-ion battery. The battery comprises a cathode, an anode, a separator arranged between the cathode and anode and a non-aqueous electrolyte; the active substances of the cathode are lithium transition metal oxides; the active substances of the anode are substances based on Si; the separator is a ceramic separator; the non-aqueous electrolyte contains a non-aqueous organic solvent, a lithium salt and additives, and the additives contain fluoroethylene carbonate (FEC), lithium difluoro(oxalato)borate (Li ODFE) and cyclo-anhydride containing unsaturated double bonds. Compared with the prior art, by means of the synergistic effect generated by the joint action of the three additives, an SEI film formed on the surfaces of the electrodes is more stable and compact, the physical and chemical structure stability of the silicon-carbon anode surface is improved, and therefore the silicon-carbon anode battery has the good high-temperate storage property and cyclic property.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery preparation, in particular to a silicon-carbon composite negative extremely 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 comprehensive performance, which depends on the research and development of new electrode materials and electrolyte systems. [0003] At present, electronic digital products such as smartphones and tablet computers have higher and higher energy density requirements for batteries, making it difficult for commercial lithium-ion batteries to meet the requirements. There are two ways to increase the ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0567
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 占孝云仰永军
Owner GUANGZHOU TINCI MATERIALS TECH