Lithium-ion battery and electrolyte thereof

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries and their electrolyte, can solve the problems of reduced cycle performance, achieve the effects of inhibiting oxidation reactions and improving cycle performance

Active Publication Date: 2015-06-03
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] from figure 1 It can be seen that when the voltage is less than 4.2V, ethylene carbonate (VC) and fluoroethylene carbonate (FEC) can effectively improve the cycle performance, but when the voltage is higher than 4.4V, the cycle performance is significantly reduced under high temperature conditions

Method used

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  • Lithium-ion battery and electrolyte thereof
  • Lithium-ion battery and electrolyte thereof
  • Lithium-ion battery and electrolyte thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Preparation of lithium-ion battery positive pole piece: Lithium cobaltate, conductive agent SuperP, and binder PVDF are mixed uniformly at a mass ratio of 96:2.0:2.0 to make a lithium-ion battery positive electrode slurry, with a coating amount of 0.0194g / cm 2 Coated on the aluminum foil of the current collector, dried at 85°C and then cold-pressed; then trimmed, cut into pieces, and divided into strips, and then dried at 85°C for 4 hours under vacuum conditions, and welded the tabs to make lithium ions Battery positive pole piece;

[0033] Preparation of the negative electrode sheet of the lithium-ion battery: graphite, conductive agent SuperP, thickener CMC, and binder SBR are made into a slurry at a mass ratio of 96.5:1.0:1.0:1.5, and the coating amount is 0.0089g / cm 2 Coated on the copper foil of the current collector, dried at 85°C and then cold-pressed; then trimmed, cut into pieces, and divided into strips, and then dried at 110°C for 4 hours under vacuum conditi...

Embodiment 2

[0037] Preparation of lithium-ion battery positive electrode sheet: same as Example 1;

[0038] Prepare the negative pole piece of lithium ion battery: same as embodiment 1;

[0039] Preparation of lithium-ion battery electrolyte: replace 2-cyanopyrimidine in Example 1 with 2-methylpyrimidine, and the rest are the same as Example 1;

[0040] Preparation of lithium ion battery: same as Example 1.

Embodiment 3

[0042] Preparation of lithium-ion battery positive electrode sheet: same as Example 1;

[0043] Prepare the negative pole piece of lithium ion battery: same as embodiment 1;

[0044] Preparation of lithium-ion battery electrolyte: replace 2-cyanopyrimidine in Example 1 with 2-fluoromethylpyrimidine, and the rest are the same as Example 1;

[0045] Preparation of lithium ion battery: same as Example 1.

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Abstract

The invention provides a lithium-ion battery and an electrolyte thereof. The electrolyte of the lithium-ion battery comprises a lithium salt and a non-aqueous solvent and at least comprises 1,3-propane sultone, fluorinated ethylene carbonate and a pyrimidine-structural compound additive. The lithium-ion battery comprises a positive pole piece, a negative pole piece, a diaphragm spaced between the positive pole piece and the negative pole piece which are adjacent, and an electrolyte, wherein the electrolyte is the electrolyte of the lithium-ion battery provided by the invention. According to the lithium-ion battery and the electrolyte thereof, provided by the invention, the oxidation reaction between the electrolyte and a positive-pole material can be inhibited, so that the cycle performance under the conditions of high temperature and pressure is improved.

Description

technical field [0001] The present application relates to a secondary battery, in particular to a lithium ion battery and its electrolyte. Background technique [0002] Although lithium-ion batteries have the advantages of high working voltage, long life and fast charging speed, with the continuous development of technology, people require lithium-ion batteries to have higher energy density. Improving the working voltage of lithium-ion batteries is one of the effective ways . [0003] In lithium-ion batteries, after charging, the metal oxide as the positive electrode active material shows very strong oxidation at high potential, so it is easy to oxidize with the electrolyte, causing the electrolyte to be decomposed. However, with the high voltage of lithium-ion batteries, the oxidative decomposition of the electrolyte at the positive electrode intensifies, and the cycle performance of the battery under high temperature conditions decreases due to the oxidative decomposition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/0567
CPCY02E60/10
Inventor 褚春波付成华赵丰刚王阿忠叶士特
Owner NINGDE AMPEREX TECH
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