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High voltage electrolyte and lithium ion battery using the electrolyte

An electrolyte and high-voltage technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as side reactions, achieve the effects of reducing decomposition, improving high-temperature performance, and inhibiting the dissolution of metal ions

Inactive Publication Date: 2016-04-27
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 the electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1. For the preparation method of the high-voltage lithium-ion battery in this embodiment, the coating surface 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;

[0043] 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 posit...

Embodiment 2～10

[0056] 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, GBL is butyrolactone, EP is ethyl propionate, DTD is vinyl sulfate, 1,3-PS is 1,3-propane sultone, SN is succinonitrile; A 1 is fumaric acid nitrile (n 1 =n 2 =0,C 4 h 2 N 2 ),A 2 is 3-hexenedinitrile (n 1 =n 2 =1,C 6 h 6 N 2 ).

[0057]

Embodiment 7

[0058] Embodiment 7 and embodiment 9 compare as can be seen with comparative example 2 and comparative example 4, do not contain 3-hexenedinitrile (C 6 h 6 N 2 ), the capacity retention rate of the 500th cycle of normal temperature cycle dropped to about 60%. High temperature storage (storage at 85°C for 4h) thickness expansion rate is much higher than that of the examples, and the capacity retention rate and recovery rate are both low, indicating that the positive electrode of the battery cannot be better protected during high temperature storage at 4.45V full charge state, resulting in electrode failure. Produce gas by side reaction with electrolyte.

[0059] The capacity retention rate of the 500th cycle of Example 7 and Example 9 is above 80%. The capacity voltage differential curves of Example 7 with different cycle numbers (the first cycle, the 300th cycle, and the 496th cycle) are shown in figure 1 . The cyclic voltammetry test result of embodiment 9 different volt...

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Abstract

The invention discloses a high voltage electrolyte and a lithium ion battery using the electrolyte. The high voltage electrolyte comprises non-aqueous solvents, a lithium salt and additives; the non-aqueous organic solvents are carbonic ester compounds and carboxylic ester compounds with contents of 1-40%; the additives are fluoroethylene carbonate (FEC) and alkene dinitrile compound. Carboxylic ester solvents for improving electrode / electrolyte interfaces are contained in the high voltage electrolyte. The high voltage battery is ensured to obtain excellent cycle performance through optimized combination of various additives such as fluoroethylene carbonate and alkene dinitrile; meanwhile, the high temperature storage performance of the high voltage battery is effectively improved; and the battery is clearly restrained from generating gas in high voltage and high temperature storage.

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): H01M10/0567H01M10/0569H01M10/0525C07C255/09
CPCC07C255/09H01M10/0525H01M10/0567H01M10/0569Y02E60/10
Inventor 占孝云仰永军万华平韩鸿波
Owner DONGUAN KAIXIN BATTERY MATERIAL
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