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Lithium Ion Battery

A lithium-ion battery and electrolyte technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large volume expansion, poor cycle performance of lithium-ion batteries, and difficulty in meeting the requirements, and achieve good high and low temperature and rate performance, The effect of improving cycle performance and good cycle performance

Active Publication Date: 2017-05-24
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, alloy anode active materials such as Si or Sn have a large volume expansion during charge and discharge, so it is easy to destroy the SEI film formed on its surface and cause anode material pulverization, which makes the cycle performance of lithium-ion batteries worse, making it difficult to Meet the requirements of practical applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Electrolyte configuration: Mix the non-aqueous organic solvents ethylene carbonate, diethyl carbonate, and propylene carbonate in a mass ratio of 1:1:1, and add a certain mass of lithium salt LiPF 6 , so that the lithium salt concentration is 1mol / L, and finally add a fluorinated cyclophosphazene derivative with the following structural formula so that its mass percentage in the electrolyte is 0.5%, that is, the preparation of the electrolyte is completed.

[0033]

[0034] Preparation of lithium-ion batteries:

[0035] ①Using LiCoO as the cathode active material 2 , PVDF as a binder and conductive carbon as a conductive agent are dispersed in N-methylpyrrolidone at a mass ratio of 95:2:3, and stirred to form a cathode slurry; apply the cathode slurry to the cathode current collector aluminum foil Then dry and roll the coated aluminum foil, and then cut it into an appropriate size to form the cathode sheet;

[0036] ② Graphite and Si (mass ratio: 85:15) as the anod...

Embodiment 2

[0039] The configuration of the electrolyte solution and the preparation of the lithium-ion battery in this example are the same as those in Example 1, except that the electrolyte solution contains 3% by mass of a fluorinated cyclic phosphazene derivative with the following structural formula.

[0040]

Embodiment 3

[0042] The configuration of the electrolyte and the preparation of the lithium-ion battery in this example are the same as in Example 1, except that the electrolyte contains 10% by mass of a fluorinated cyclic phosphazene derivative with the following structural formula and 3% of Vinylene carbonate (VC), and the anode active material is Sn.

[0043]

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PUM

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Abstract

The invention discloses a lithium ion battery. The lithium ion battery comprises electrolyte, a cathode plate, an anode plate and an isolating membrane isolated between the cathode plate and the anode plate, wherein an anode active material adopted by the anode plate comprises Si or Sn or an alloy containing Si or Sn; the electrolyte comprises a non-aqueous organic solvent, lithium salt, an additive and a fluorate cyclic phosphazene ramification which is expressed by a chemical formula (1) and contains unsaturated branched chains. According to the electrolyte of the lithium ion battery disclosed by the invention, a multi-layer composite SEI (Solid Electrolyte Interphase) film with the relatively high tenacity is formed on the surface of the anode active material, such as Si or Sn, of the alloy, the SEI film is not easily damaged during the recycling process, and the effect of protecting the anode active material, such as Si or Sn, of the alloy can be effectively achieved, and thus the cycle performance of the anode active material, such as Si or Sn, of the alloy is effectively improved, the lithium ion battery containing the electrolyte has the relatively good cycle performance and also has the good low temperature and rate performances.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, more specifically, the invention relates to a lithium ion battery with Si or Sn and alloy anodes thereof. Background technique [0002] Lithium-ion batteries are currently the most advanced commercial secondary batteries in the world. With the rapid development of electronic technology and electronic equipment, the demand for lithium-ion batteries in electronic products is growing rapidly. The high discharge voltage and high The energy density and excellent low self-discharge characteristics make it widely used. However, the rapid development of electronic equipment also puts forward higher requirements on the capacity and energy density of lithium-ion batteries. [0003] In order to further increase the energy density of lithium-ion batteries, cathode materials and anode materials with higher voltages have been developed one after another, especially the application of Si or Sn and their al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/137H01M4/62H01M10/0567
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 钟松材
Owner DONGGUAN AMPEREX TECH