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High-voltage lithium battery with silicon-based negative electrode

A silicon-based negative electrode, high-voltage technology, used in battery electrodes, secondary batteries, and secondary battery repair/maintenance, etc., to achieve good cycle life and good cycle performance.

Inactive Publication Date: 2017-05-10
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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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  • High-voltage lithium battery with silicon-based negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. For the preparation method of the high-voltage lithium-ion battery in this embodiment, the coating area density is determined according to the battery model (PL454261), design capacity, and positive and negative electrode material gram capacity. 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-based negative electrode produced by Shenzhen Beiterui (the silicon content in the silicon-based negative electrode material accounts for 1% to 15%).

[0038] The positive electrode preparation steps, negative electrode preparation steps, electrolyte preparation steps, diaphragm preparation steps and battery assembly steps are described as follows:

[0039] The preparation step of the positive electrode is: mix high-voltage positive electrode active material lithium cobaltate, conductive carbon black and binder polyvinylidene fluoride at a...

Embodiment 2～15

[0053] Examples 2-15 are the same as Example 1 except that the composition and content of additives (based on the total weight of the electrolyte) are added as shown in Table 1. In the table, 1,3-PS is 1,3-propane sultone, PRS is propenyl-1,3-sultone, AN is adiponitrile, SN is succinonitrile, DTD is vinyl sulfate, DCB 3-hexenedinitrile, BCN is 1,2-bis(2-cyanoethoxy)ethane, and PEN is 1,3-benzenediacetonitrile.

[0054]

[0055]

[0056]

[0057]

[0058] Examples 1 to 15 adopting the technical solution of the present application have better normal-temperature cycle performance, high-temperature storage and low-temperature discharge performance. The batteries using the electrolyte solutions of Comparative Examples 1 to 6 cannot simultaneously take into account high and low temperature and cycle performance, and the overall performance is poor.

[0059] Embodiment 1 is with comparative example 1, comparative example 2 and comparative example 3; Embodiment 14 is comp...

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Abstract

The invention provides a high-voltage lithium secondary battery. The high-voltage lithium secondary battery comprises a negative electrode, a positive electrode, a separator and a non-aqueous electrolyte, wherein the separator and the non-aqueous electrolyte are arranged between the negative electrode and the positive electrode, an active substance of the negative electrode is a lithium transition metal oxide, an active substance of the positive electrode is a mixture containing elemental silicon or silicon oxide, the separator is a polyethylene (PE), polypropylene (PP) or ceramic separator, the non-aqueous electrolyte comprises a non-aqueous organic solvent, a lithium salt and an additive, and the additive comprises fluoroethylene carbonate (FEC), 1,3,5-triallyl isocyanurate and a dinitrile compound. Compared with the prior art, the high-voltage lithium secondary battery has the advantages that by a synergistic effect generated by combined application of the three additives, the physical and chemical structural stability of an electrode surface is improved, so that the high-voltage lithium battery with a silicon-based negative electrode has relatively good high-temperature storage performance and cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery preparation, in particular to a silicon-based negative high-voltage lithium 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 energy density of a battery: ...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/48H01M10/0567H01M10/42H01M10/0525
CPCH01M4/386H01M4/48H01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 占孝云余乐万华平周邵云徐朝银张彬乐丽华
Owner GUANGZHOU TINCI MATERIALS TECH
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