Low-temperature type carbonic ester lithium battery electrolyte

An electrolyte and carbonate technology, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problems of affecting the efficiency of the battery, the inability to discharge the battery, and affecting the charging and discharging performance of the battery, so as to increase the service life and improve the stability. performance, and the effect of reducing low-temperature resistance

Active Publication Date: 2013-11-27
CHAOYANG GUANGDA CHEM
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Problems solved by technology

[0003] Some research results show that: lithium iron phosphate batteries will affect the charge and discharge performance of batteries under low temperature conditions due to the low ionic conductivity of lithium iron phosphate materials; in recent years, the limit value of climate change has continuously refreshed historical records, especially in the north The temperature in winter is low, and the battery cannot f

Method used

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  • Low-temperature type carbonic ester lithium battery electrolyte
  • Low-temperature type carbonic ester lithium battery electrolyte
  • Low-temperature type carbonic ester lithium battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1.3% Polydimethylsiloxane (PDMS) and 0.8% Vinylene Carbonate in Ethylene Carbonate (EC), Dimethyl Carbonate (DMC), Ethyl Methyl Carbonate (EMC) and Propylene Carbonate (PC) After the addition of ester (VC), the synergistic effect is the largest, and the discharge capacity and conductivity change greatly. It can effectively improve the low-temperature performance of lithium battery electrolyte at -50°C, and can maintain high conductivity and discharge capacity. Table 1 shows the changes in the discharge capacity and conductivity of the two electrolytes.

[0019] Table 11mol / L LiPF 6 Discharge capacity and conductivity of electrolytes composed of different solvents at different temperatures

[0020]

Embodiment 2

[0022] The low temperature performance was also improved after adding 1.3% polydimethylsiloxane (PDMS) additive to ethylene carbonate (EC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC) and propylene carbonate (PC). Partial improvement has been obtained, and the discharge capacity and electrical conductivity are improved compared with no additives, but the effect is not as good as the synergistic effect of the two additives. Table 2 shows the changes in the discharge capacity and conductivity of the two electrolytes.

[0023] Table 21mol / L LiPF 6 Discharge capacity and conductivity of electrolytes with the same solvent composition at different additive amounts and different temperatures

[0024]

Embodiment 3

[0026] Additives of 0.8% vinylene carbonate (VC) to ethylene carbonate (EC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC) and propylene carbonate (PC) improved cycle performance, but Low temperature performance is unchanged. Table 3 is the comparison of the discharge capacity and conductivity of the two electrolytes with two additives and one additive added.

[0027] Table 31mol / L LiPF 6 Discharge capacity and conductivity of electrolytes with the same solvent composition at different additive amounts and different temperatures

[0028]

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Abstract

The invention discloses a low-temperature type carbonic ester lithium battery electrolyte. The electrolyte mainly comprises the following components: ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate and propylene carbonate as solvents, lithium hexafluorophosphate and a low temperature additive. The four carbonic ester solvents are in the following weight ratio: EC: DMC: EMC: PC=2:3:5:1; the components are prepared into an 1 mol / L electrolyte containing LiPF6, four carbonic ester solvents, the low temperature additive; and the low temperature additive is one selected from polydimethylsiloxane, 1,3- propane sultone, and vinylene carbonate, or a combination thereof. According to the invention, optimization of composition of the carbonic ester solvents and addition of the low temperature additive are employed to increase solubility, degree of dissociation and conductivity of the electrolyte, improve structure of a solid phase interfacial film (SEI membrane) of the lithium ion battery cathode, the integral stability of the battery and battery cycling and prolong usage life. Especially, the invention provides a mainstream electrolyte for lithium ion power batteries used in a lowest temperature of -50 DEG C in most regions in northern China.

Description

technical field [0001] The invention belongs to the lithium battery electrolyte in the technical field of electrochemical materials, in particular to a low-temperature carbonate lithium battery electrolyte which uses carbonate organic matter as a solvent and improves the low-temperature performance of the electrolyte. Background technique [0002] As the marketization of lithium-ion batteries continues to deepen, people's expectations for battery performance are getting higher and higher. At present, it is difficult for commercial lithium-ion batteries to meet the needs of important fields such as electric vehicles, aerospace technology and military affairs. One of the main reasons is that the performance of batteries is not good at high and low temperatures. Key issues of concern to researchers. Starting from the electrolyte to improve the temperature performance has been proved to be a feasible technical approach, because as an ionic conductor that plays a conductive role...

Claims

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Application Information

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IPC IPC(8): H01M10/0567
CPCY02E60/12Y02E60/10
Inventor 陈锡良齐晓辉刘宏莉
Owner CHAOYANG GUANGDA CHEM
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