Lithium ion battery with wide temperature range

A lithium-ion battery, wide temperature technology, used in secondary batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve problems such as poor electrochemical performance, reduce battery internal resistance, improve battery rate performance, and achieve excellent technical effects Effect

Active Publication Date: 2020-09-11
LONG SING TECH GRP HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem that lithium-ion batteries in the prior art cannot have both excellent low-temperature resistance and high-temperature resistance, and the electrochemical performance is poor in extreme temperature environments

Method used

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  • Lithium ion battery with wide temperature range
  • Lithium ion battery with wide temperature range
  • Lithium ion battery with wide temperature range

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] A wide temperature range Li-ion battery:

[0080] The wide temperature range lithium-ion battery of the present embodiment comprises positive plate (the density of single surface is 10mg / cm 2 , the compression ratio is 0.8), the negative plate (the density on one side is 8mg / cm 2 , compression ratio is 0.7), electrolyte and separator (thickness is 25μm, composed of polyethylene and polypropylene);

[0081] The negative electrode sheet described in this embodiment is: the negative electrode active material layer is attached on the copper foil, and the mass ratio of flake structure graphite, Super P, KS6 and polyvinylidene fluoride in the negative electrode active material layer is 85%:5% : 2%: 8%; the crystal face of the described flake structure graphite (referred to as graphite in the figure and table) is (002) crystal face, figure 1 For the XRD figure of graphite in the present embodiment graphite and embodiment 2, XRD parameter is as shown in table 1:

[0082] Tab...

Embodiment 2

[0102] The difference from Example 1 is that the graphite in Example 1 is replaced by the same amount of graphite with the parameters in Table 1 (that is, the graphite commonly used in the market).

[0103] Compared with Example 1, the performance of the battery obtained in this example is poorer, because the graphite used in this example has more internal defects, resulting in poor lithium ion transmission and conductivity, thereby affecting the rate performance of the battery at high and low temperatures.

Embodiment 3

[0105] A wide temperature range Li-ion battery:

[0106] The wide temperature range lithium-ion battery of this embodiment comprises the positive electrode sheet (the single surface density is 9mg / cm 2 , the compression ratio is 0.7), the negative plate (the density on one side is 6mg / cm 2 , compression ratio is 0.8), electrolyte and separator (thickness is 35μm, composed of polyethylene and polypropylene);

[0107] The negative electrode sheet described in this embodiment is: the negative electrode active material layer is attached on the copper foil, and the mass of flake structure graphite (particle diameter D50 is 10 μm), Super P, KS6 and polyvinylidene fluoride in the negative electrode active material layer The ratio is 80%: 7%: 3%: 10%; the crystal face of the graphite with flake structure is (002) crystal face;

[0108] The positive electrode sheet described in this embodiment is: the positive electrode active material layer is attached on the aluminum foil, and the ...

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Abstract

The invention relates to a lithium ion battery with a wide temperature range. The lithium ion battery with the wide temperature range comprises a positive plate, a negative plate, an electrolyte and adiaphragm. A positive electrode active substance in the positive plate is high-nickel layered lithium metal oxide, and a negative electrode active substance in the negative plate is flake-structure graphite; the electrolyte comprises a chain ester solvent, lithium salt and an additive, wherein the additive comprises vinylene carbonate, fluoroethylene carbonate and a styrene-6-caprolactone-trimethylene carbonate copolymer. Through selection of battery materials (a positive active material, a negative active material, an electrolyte formula and the like) in the wide-temperature-range lithium ion battery, the obtained wide-temperature-range lithium ion battery still has excellent rate capability and cycle performance when working in an extreme temperature environment (-40 to 85 DEG C); the lithium ion battery with the wide temperature range can realize high-current discharge at an extreme temperature.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery with a wide temperature range, in particular to a battery that can be used at extreme temperatures of -40°C to 85°C. Background technique [0002] Due to its outstanding advantages such as high energy density, low self-discharge, and no memory effect, lithium-ion batteries have become the main solution for mobile energy, and are widely used in many fields such as mobile phones, tablets, electric vehicles, and home energy storage. The use environment of lithium-ion batteries is relatively complex, so higher requirements are placed on the performance of lithium-ion batteries. [0003] At present, the research on lithium-ion batteries mainly focuses on the charging and discharging speed, capacity and battery life, etc., but limited by the flow of lithium ions and the properties of battery materials, the performance of general lithium-ion batteries...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/587H01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M10/058H01M10/42
CPCH01M4/525H01M4/587H01M10/0567H01M10/0569H01M10/0568H01M10/058H01M10/0525H01M10/4235H01M2300/0037Y02E60/10Y02P70/50
Inventor 路胜博王炜贤韩颖龙徐祯祥
Owner LONG SING TECH GRP HONG KONG
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