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Electrolyte suitable for silicon-carbon negative electrode and lithium ion battery

An electrolyte and negative electrode technology, applied in the field of electrolyte and lithium ion batteries, can solve the problems of increasing battery polarization, deteriorating cycle performance and low temperature characteristics, etc.

Pending Publication Date: 2020-10-27
香河昆仑新能源材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of nitrile compounds in the ternary high-nickel cathode material system will increase the polarization of the battery and seriously deteriorate the cycle performance and low temperature characteristics.

Method used

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  • Electrolyte suitable for silicon-carbon negative electrode and lithium ion battery
  • Electrolyte suitable for silicon-carbon negative electrode and lithium ion battery
  • Electrolyte suitable for silicon-carbon negative electrode and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]Electrolyte preparation: In a glove box filled with argon, ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) were mixed in a volume ratio of EC:DEC:EMC=25:15 : 60 for mixing, then slowly add lithium hexafluorophosphate (LiPF 6 ), lithium difluorooxalate borate (LiDFOB) accounting for 0.5wt% of the total mass of the electrolyte, and lithium bistrifluorosulfonimide (LiTFSI) accounting for 1.0wt% of the total mass of the electrolyte, and finally adding 2.0wt% of the total mass of the electrolyte % of fluorinated phenyl boron compound additives with structural formula I, 0.5wt% of disilyl sulfate compound additives with structural formula II in the total mass of the electrolyte, 10.0wt% fluoroethylene carbonate in the total mass of the electrolyte ( FEC) and vinyl sulfate (DTD) accounting for 1.0wt% of the total mass of the electrolyte were stirred evenly to obtain the lithium-ion battery electrolyte.

[0038] Preparation of soft-pack battery...

Embodiment 1-11 and comparative example 1-8

[0043] Examples 1-11 and Comparative Examples 1-8 are used to carry out the following electrochemical performance tests with full batteries:

[0044] 1) Normal temperature cycle test: At 25°C, charge the battery after capacity division to 4.2V at 1C constant current and constant voltage, with a cut-off current of 0.05C, then discharge at 1C constant current to 3.0V, and cycle accordingly, charging / discharging After 1000 cycles, calculate the 1000th cycle capacity retention rate, the calculation formula is as follows:

[0045] 1000th cycle capacity retention rate (%)=(1000th cycle discharge capacity / first cycle discharge capacity)×100%.

[0046] 2) 60°C high-temperature storage thickness expansion and capacity retention rate recovery rate test: first place the battery at room temperature and cycle charge and discharge once at 0.5C / 0.5C (3.0V ~ 4.2V), record the discharge capacity C0 of the battery before storage, Then charge the battery with a constant current and constant vol...

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Abstract

The invention discloses an electrolyte suitable for a silicon-carbon negative electrode and a lithium ion battery. The electrolyte comprises an electrolyte lithium salt, a non-aqueous organic solventand an additive. The additive comprises a negative electrode film-forming additive, a fluorinated phenyl boron compound and a disilyl sulfate compound. Through the synergistic effect of the fluorophenyl boron compound additive, the disilane alkyl sulfate compound additive, the negative electrode film-forming additive and the novel lithium salt type additive, the electrolyte has excellent film-forming performance on the surface of the silicon-carbon negative electrode, and the formed SEI film is relatively small in impedance and relatively stable in component and structure. By using the electrolyte, the discharge capacity, the cycling stability and the high-temperature storage performance of the silicon-carbon negative electrode lithium ion battery can be effectively improved, gas production can be inhibited, the problems of volume expansion, particle breakage and the like in the battery cycling process can be effectively solved, and meanwhile, the electrolyte has good high-temperatureand low-temperature performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to an electrolyte suitable for a silicon-carbon negative electrode and a lithium-ion battery. Background technique [0002] Lithium-ion secondary batteries are called "green energy", which is the preferred technology to solve contemporary environmental pollution and energy problems. In recent years, lithium-ion batteries have been widely used in 3C digital, electric tools, energy storage, power vehicles and other fields due to their advantages such as high specific energy, no memory effect, and long cycle life, but consumers still expect batteries with higher comprehensive performance available, which depends on the research and development of new electrode materials and electrolyte systems. [0003] At present, commercial lithium-ion batteries mainly use graphite as the negative electrode material, but the maximum theoretical specific capacity of graphite...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0567H01M10/4235H01M10/0525H01M2300/0025Y02E60/10
Inventor 吕亮郭营军申海鹏张和平赖定坤
Owner 香河昆仑新能源材料股份有限公司
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