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High-voltage electrolyte and lithium ion battery using same

A lithium-ion battery and electrolyte technology, which is applied in the field of lithium-ion batteries and high-voltage electrolytes, can solve problems such as side reactions, achieve the effects of reducing decomposition, low internal resistance, improving cycle performance and high temperature performance

Active Publication Date: 2016-01-06
GUANGZHOU TINCI MATERIALS TECH
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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 same
  • High-voltage electrolyte and lithium ion battery using same
  • High-voltage electrolyte and lithium ion battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 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 (model 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;

[0039] 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 pos...

Embodiment 2～18

[0051] 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, SN is succinonitrile, AN For adiponitrile.

[0052] Table 1

[0053]

[0054]

[0055]

[0056] Comparing Example 6 with Comparative Example 2, it can be seen that in Comparative Example 2 without 3-thiopheneacetonitrile, the capacity retention rate of the 500th cycle at room temperature dropped to 61%, the internal resistance of the battery was also slightly higher, and the corresponding high-temperature storage performance was also poor.

[0057] Example 6 Compared wi...

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Abstract

The invention relates to high-voltage electrolyte and a lithium ion battery using the same. The high-voltage electrolyte comprises a non-aqueous solvent, and lithium salt and additives dissolved in the non-aqueous solvent; the non-aqueous solvent comprises 1-40 mass% of carboxylic ester compound; and the additives comprise fluoroethylene carbonate (FEC) and 3-thiopheneacetonitrile. The electrolyte is optimized and combined through the carboxylic ester solvent capable of improving the electrode / electrolyte interface, and a plurality of additives of fluoroethylene carbonate (FEC), 3-thiopheneacetonitrile and the like, so as to ensure that the lithium ion battery using the electrolyte can obtain lower internal resistance, and meanwhile the cycle performance and the high temperature performance of the high-voltage batteries are effectively improved.

Description

technical field [0001] The invention relates to the field of preparation of lithium battery materials, 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 de...

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韩鸿波乐丽华王再盛胡巍许梦清
Owner GUANGZHOU TINCI MATERIALS TECH
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