Non-aqueous electrolyte solution for high-voltage lithium ion secondary battery and high-voltage lithium ion secondary battery

A non-aqueous electrolyte, lithium-ion battery technology, applied in secondary batteries, electrolytes, circuits, etc., can solve the problem that battery performance needs to be further improved, and achieve excellent cycle performance and high temperature performance, high decomposition voltage and oxidation resistance, The effect of excellent cycle performance

Inactive Publication Date: 2016-06-15
DONGUAN KAIXIN BATTERY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] U.S. Patent US2008 / 0311481Al (SamsungSDICo., Ltd) discloses an ether / aryl compound containing two nitrile groups, which can improve the inflation of the battery under high voltage and high temperature conditions, and improve the high temperature storage performance, and its battery performance needs to be further improved

Method used

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  • Non-aqueous electrolyte solution for high-voltage lithium ion secondary battery and high-voltage lithium ion secondary battery
  • Non-aqueous electrolyte solution for high-voltage lithium ion secondary battery and high-voltage lithium ion secondary battery
  • Non-aqueous electrolyte solution for high-voltage lithium ion secondary battery and high-voltage lithium ion secondary battery

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 capacity design of the battery (454261PL: 1640mAh) 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;

[0038] 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...

Embodiment 2～10

[0050] Examples 2-10 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, FB is fluorobenzene, EP is ethyl propionate, DTD is vinyl sulfate, 1,3-PS is 1,3-propane sultone, and SN is succinonitrile. A1 is 1,3,5 pentanetricarbonitrile (4379-04-8), A2 is 1,2,3 propanetricarbonitrile (62872-44-0), A3 is 1,3,6 hexanetricarbonitrile (1772- 25-4).

[0051] Table 1. Contents of each component of electrolyte additives and battery performance test results

[0052]

[0053]

[0054] Comparing Example 6 with Comparative Example 1 and Comparative Example 2, it can be seen that the capacity retention rate of Comparative Example 2 without A3, or Comparative...

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Abstract

The invention discloses a non-aqueous electrolyte solution for a high-voltage lithium ion secondary battery. The non-aqueous electrolyte solution comprises a non-aqueous solvent, a lithium salt dissolved in the non-aqueous solvent and additives, wherein the non-aqueous solvent comprises 1-15mass% of fluorobenzene in the electrolyte; and the additives comprise fluoroethylene carbonate (FEC) and a tri-nitrile material. Due to the non-aqueous electrolyte solution for the high-voltage lithium ion secondary battery, the high-voltage lithium ion secondary battery can obtain excellent cycling 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-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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0567H01M10/0569
CPCH01M10/0525H01M10/0567H01M10/0569H01M2300/0034Y02E60/10
Inventor 万华平占孝云仰永军王再盛
Owner DONGUAN KAIXIN BATTERY MATERIAL
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