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Silicon-based cathode high-voltage lithium ion battery

A lithium-ion battery, silicon-based negative electrode technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problem that battery performance needs to be further improved, and achieve the effect of good cycle performance and good cycle life

Inactive Publication Date: 2016-11-09
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] U.S. Patent US 2008 / 0311481Al (Samsung SDI Co., Ltd) discloses an ether / aryl compound containing two nitrile groups, which improves the inflation of the battery under high-voltage and high-temperature conditions, and improves high-temperature storage performance, and its battery performance needs to be further improved Improve

Method used

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  • Silicon-based cathode high-voltage lithium ion battery
  • Silicon-based cathode high-voltage lithium ion battery
  • Silicon-based cathode high-voltage lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0044] 1. In the preparation method of the high-voltage lithium-ion battery of 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%).

[0045] The positive electrode preparation steps, negative electrode preparation steps, electrolyte preparation steps, diaphragm preparation steps and battery assembly steps are described as follows:

[0046] The preparation step of the positive electrode is: mix the high-voltage positive electrode active material lithium cobaltate, conductive carbon black and binder polyvinylidene fluoride at a...

Embodiment 2～15

[0060] 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.

[0061] 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, and DCB It is 3-hexenedinitrile, BCN is 1,2-bis(2-cyanoethoxy)ethane, and PEN is 1,3-benzenediacetonitrile.

[0062]

[0063]

[0064]

[0065]

[0066] 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.

[0067] Embodiment 1 is with comparative examples 1~3, and embodiment 14 compares with comparative exam...

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Abstract

The invention discloses a silicon-based cathode high-voltage lithium ion battery which comprises a negative pole, positive pole, a diaphragm arranged between the negative pole and the positive pole and a nonaqueous electrolyte. An active ingredient of the negative pole is lithium transition metal oxide, an active ingredient of the positive pole is a substance based on Si, the diaphragm is a ceramic diaphragm, the nonaqueous electrolyte comprises a nonaqueous organic solvent, lithium salt and additives, and the additives include fluoroethylene carbonate (FEC), trifluoromethanesulfonic acid (Li SO3F3) and a dinitrile compound. Compared with the prior art, the silicon-based cathode high-voltage lithium ion battery has the advantages that due to synergistic effect generated by combined use of the three additives, an SEI film formed on the surface of an electrode is more stable and compact, and physical and chemical structural stability of the surface of a silicon-carbon cathode is improved, so that a silicon-carbon cathode battery has high high-temperature storage performance and circulating performance.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0567
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 占孝云仰永军张彬万华平韩鸿波曾庆鹏
Owner GUANGZHOU TINCI MATERIALS TECH
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