High-voltage electrolyte and lithium ion battery using electrolyte

An electrolyte, high-voltage technology, used in secondary batteries, circuits, electrical components, etc., can solve problems such as side reactions, reduce decomposition, improve cycle and high temperature performance, and improve oxidation stability.

Inactive Publication Date: 2015-10-14
DONGUAN KAIXIN BATTERY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] U.S. Patent No. 5,471,862 replaces the ethers in the electrolyte with chain carboxylate to form an electrolyte containing a mixed solvent of chain carboxylate, cyclic carbonate and chain carbonate, avoiding side reactions between ethers and the negative electrode , significantly improved the low-temperature cycle performance and high-temperature storage performance of lithium-ion batteries, but carboxylate solvents will have unavoidable side reactions with the negative electrode

Method used

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  • High-voltage electrolyte and lithium ion battery using electrolyte
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  • High-voltage electrolyte and lithium ion battery using electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 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 (1640mAh) of the battery and the capacity of the positive and negative electrode materials. The positive electrode active material was purchased from Hunan Shanshan high-voltage lithium cobalt oxide material; the negative electrode active material was purchased from Jiangxi Zichen Technology. The positive electrode preparation steps, negative electrode preparation steps, electrolyte preparation steps, diaphragm preparation steps and battery assembly steps are described as follows;

[0036] 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 mass ratio of 96.8:2.0:1.2, and disperse them in N-methyl-2-pyrrolidone , to obtain the positive electrode slurry, the positive electrode ...

Embodiment 2～18

[0048] Examples 2-18 and Comparative Examples 1-4 are the same as Example 1 except that the composition of solvent in the electrolyte, the composition and content of additives (based on the total weight of the electrolyte) are added as shown in Table 1. Table 1 shows the content of each component of the electrolyte additive and the battery performance test results. In the table, PP is propyl propionate, GBL is butyrolactone, EP is ethyl propionate, DTD is vinyl sulfate, 1,3-PS is 1,3-propane sultone, and SN is succinonitrile.

[0049]

[0050]

[0051]

[0052] Embodiment 6 compares with comparative example 2~4 as can be seen, does not contain ethylene glycol bis(propionitrile) ether in the comparative example, or does not contain bisoxalate lithium borate (Li BOB) and ethylene glycol bis(propionitrile) ether simultaneously, The capacity retention rate of the 500th cycle of the normal temperature cycle drops below 65%, and the corresponding capacity retention rate is ...

Embodiment 24

[0058] Example 24 is compared with comparative examples 6 and 7. It can be seen that the same solvent composition does not contain ethylene glycol bis(propionitrile) ether only in the comparative example, or does not contain Li BOB and ethylene glycol bis(propionitrile) ether simultaneously, The capacity retention rate of the 500th cycle of the normal temperature cycle drops below 75%, the capacity retention rate corresponding to high temperature storage is low, and the battery swells significantly.

[0059] Compared with Comparative Example 1 in Example 24, Comparative Example 1 containing no carboxylate solvents, Li BOB and ethylene glycol bis(propionitrile) ether has severe gas swelling, and the corresponding normal temperature cycle and high temperature storage performance is poor. Further by each embodiment and comparative example 5-8 contrast, find to contain the carboxylate solvent that improves electrode / electrolyte interface, by same Li BOB, fluoroethylene carbonate, e...

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Abstract

The invention discloses high-voltage electrolyte and a lithium ion battery using the electrolyte. The invention is realized by the following technical scheme: the high-voltage electrolyte comprises a non-aqueous solvent, lithium salt and an additive, wherein the non-aqueous solvent is a carboxylic ester compound which accounts for 1-40% by mass of the high-voltage electrolyte; the additive is any one or more of lithium bis(oxalate)borate (Li BOB), fluoroethylene carbonate (FEC) and ethylene glycol bis(propionitrile) ether. The high-voltage electrolyte contains carboxylic ester solvents capable of improving an electrode/electrolyte interface, and through optimized combination of the carboxylic ester solvents, Li BOB, FEC, ethylene glycol bis(propionitrile) ether and other various additives, the good cycle performance of a high-voltage battery can be ensured, meanwhile, the high-temperature storage performance of the high-voltage battery can be effectively improved, and gas generation of the battery under high-voltage high-temperature storage condition can be obviously inhibited.

Description

technical field [0001] The invention relates to the field of lithium battery preparation, in particular to a high-voltage electrolyte and a lithium ion battery using the electrolyte. 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 ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569Y02E60/10
Inventor 仰永军许梦清万华平占孝云
Owner DONGUAN KAIXIN BATTERY MATERIAL
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