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Nonaqueous electrolyte solution for high-voltage lithium ion secondary battery and high-voltage lithium secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in the field of non-aqueous electrolyte solution for high-voltage lithium-ion secondary batteries, high-voltage lithium secondary batteries, can solve problems such as side reactions, achieve high decomposition voltage and oxidation resistance , Excellent cycle performance and high temperature performance, the effect of excellent cycle performance

Inactive Publication Date: 2015-12-02
DONGUAN KAIXIN BATTERY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 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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  • Nonaqueous electrolyte solution for high-voltage lithium ion secondary battery and high-voltage lithium secondary battery
  • Nonaqueous electrolyte solution for high-voltage lithium ion secondary battery and high-voltage lithium secondary battery
  • Nonaqueous electrolyte solution for high-voltage lithium ion secondary battery and high-voltage lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]The preparation method of the high-voltage lithium-ion battery in this embodiment is: according to the capacity design (1640mAh) of the battery, the capacity of the positive and negative electrode materials determines the coating surface density. 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;

[0037] 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 slurry ...

Embodiment 2～18

[0050] 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, 1,3-PS is 1,3-propane sultone, AN is adiponitrile, and SN is succinonitrile.

[0051] MA is maleic anhydride, 2-MA is 2-methylmaleic anhydride, and DMA is 2,3-dimethylmaleic anhydride.

[0052] Table 1

[0053]

[0054]

[0055]

[0056] Comparing Example 6 with Comparative Examples 2 to 4, it can be seen that the comparative example does not contain the compound of formula 1, or does not contain LiTFSI and the compound of formula 1 at the same time, the capacity retention rate of the 500th cycle of normal temperature cycl...

Embodiment 24

[0062] Comparing Example 24 with Comparative Examples 6 and 7, it can be seen that with the same solvent composition, only the Comparative Example does not contain DMA, or does not contain LiTFSI and DMA at the same time. The corresponding capacity retention rate is low, and the battery is obviously bloated.

[0063] Compared with Comparative Example 1 in Example 24, Comparative Example 1 that does not contain carboxylate solvents, LiTFSI and DMA has serious gas swelling, and the corresponding normal temperature cycle and high temperature storage performance is poor. Further, by comparing each example with Comparative Examples 5-8, it is found that the carboxylate solvent containing the electrode / electrolyte interface can be effectively improved by combining additives such as LiTFSI, fluoroethylene carbonate and formula 1 compounds. The cycle performance of the high-voltage ternary battery can obviously suppress the battery inflation, and it takes into account the cycle and hi...

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Abstract

The invention discloses a nonaqueous electrolyte solution for a high-voltage lithium ion secondary battery. The nonaqueous electrolyte solution comprises nonaqueous organic solvent, lithium salt and additives, wherein the lithium salt and the additives are dissolved in the nonaqueous organic solvent. The nonaqueous organic solvent is a carboxylic acid ester compound with the mass percentage content being 1%-40% in the nonaqueous electrolyte solution. The additives comprise fluoroethylene carbonate (FEC), Li TFSI and at least one of compounds with the structures shown in the formula I (please see the specification for the formula), wherein R1 and R2 in the formula represent hydrogen or an alkyl group composed of 1-5 carbon atoms. The electrolyte solution for the high-voltage lithium ion secondary battery has the advantage that the high-voltage lithium ion secondary battery can achieve good cycle performance and high-temperature performance.

Description

technical field [0001] The invention relates to the field of lithium battery preparation, in particular to a non-aqueous electrolyte solution for a high-voltage lithium-ion secondary battery and a high-voltage lithium secondary 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. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569H01M2300/0042Y02E60/10
Inventor 仰永军占孝云万华平王再盛许梦清
Owner DONGUAN KAIXIN BATTERY MATERIAL
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