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Electrode system used in low-temperature rate type lithium ion battery

A lithium-ion battery and electrode system technology, applied in the field of electrode systems, can solve problems such as failure to discharge electricity, increased battery polarization, and premature discharge voltage

Inactive Publication Date: 2017-02-22
江苏海四达电源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When an ordinary battery is used under high-current discharge in a low-temperature environment, the polarization of the battery increases, the discharge platform decreases, and the discharge voltage is reached prematurely, resulting in too little discharge capacity of the battery or no discharge directly.

Method used

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  • Electrode system used in low-temperature rate type lithium ion battery
  • Electrode system used in low-temperature rate type lithium ion battery
  • Electrode system used in low-temperature rate type lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Low-temperature rate lithium-ion battery A1 with a rated capacity of 5Ah: composed of positive electrode, negative electrode, separator and electrolyte. Among them, the positive electrode contains (calculated by weight percentage of solid): 98.2% LiCoO 2 (D 50 5.2um), 0.8% binder PVDF, 1% conductive agent CNT; the negative electrode contains (calculated by weight percentage of solid): 74% artificial graphite, 20% hard carbon, 1.5% conductive agent KS-6, 1.5% Conductive agent SP, 3% binder PVDF, 0.25% oxalic acid; polyethylene ceramic film is used as diaphragm; low-temperature electrolyte containing vinylene carbonate and fluoroethylene carbonate is selected.

Embodiment 2

[0021] A2 in the low-temperature rate lithium-ion battery with a rated capacity of 5Ah: consists of positive electrode, negative electrode, separator and electrolyte. Among them, the positive electrode contains (calculated by weight percentage of solid): 96% LiCoO 2 (D 50 7.2um), 2% binder PVDF, 2% conductive agent CNT; the negative electrode contains (calculated by weight percentage of solid): 78% artificial graphite, 15% hard carbon, 3% conductive agent SP, 4% bond Agent PVDF, 0.15% oxalic acid; use polyethylene ceramic film as the diaphragm; use low-temperature electrolyte containing vinylene carbonate and fluoroethylene carbonate.

Embodiment 3

[0023] According to the method of Example 1, the low-temperature rate lithium-ion battery A3 with a rated capacity of 5Ah is obtained, the difference is that the LiCoO in the positive electrode 2 Change to LiNi 0.4 co 0.1 mn 0.5 o 2 .

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Abstract

The invention discloses an electrode system used in a low-temperature rate type lithium ion battery. The electrode system used in the low-temperature rate type lithium ion battery comprises a positive electrode and a negative electrode, wherein the positive electrode contains an active substance, a binder and a conducting agent, and the negative electrode contains artificial graphite, hard carbon, a conducting agent, a binder and oxalic acid; the active substance is lithium cobalt oxide LiCoO2 or lithium nickel cobalt manganese oxide LiNixCoyMn(1-x-y)O2. The low-temperature rate type lithium ion battery provided with the electrode system has the excellent discharge performance in a low-temperature environment.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to an electrode system in a low-temperature rate lithium ion battery. Background technique [0002] Lithium-ion batteries have attracted much attention because of their high energy density, high voltage platform, excellent cycle performance, portability, safety and environmental protection, and are widely used in various products. With the advancement of science and technology and the development of society, portable products are developing toward miniaturization, intelligence, and multi-functionality. The complexity of product use environments increases, requiring batteries as energy sources to have better environmental applicability. The low-temperature performance (low temperature generally refers to below -10°C) is particularly important as an important indicator for considering the environmental applicability of the battery. When an ordinary battery is used under high-current discharge...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/362H01M4/366H01M4/505H01M4/525H01M4/583H01M4/62H01M10/0525Y02E60/10
Inventor 沈晓彦王进沙永香葛汤铭
Owner 江苏海四达电源有限公司
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