Lithium ion battery with thermal sensitive layer

A lithium-ion battery and heat-sensitive layer technology, applied in the field of heat-sensitive layers, can solve problems such as short circuit, exposed electrodes, and diaphragm failure

Active Publication Date: 2016-06-15
NANO & ADVANCED MATERIALS INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the internal cell temperature rises to the softening temperature of the separator, the separator shrinks due to the residual stress induced during the stretching of the separator an

Method used

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  • Lithium ion battery with thermal sensitive layer
  • Lithium ion battery with thermal sensitive layer
  • Lithium ion battery with thermal sensitive layer

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Embodiment

[0040] Polystyrene (PS) particles of 400 nm were dispersed in ethanol at a concentration of 1 wt%. The PS particle dispersion was coated on the graphite anode using a spray gun. Figure 2a with 2b is the SEM image of the PS particles coated on graphite anode and observed at close range. A uniform thermosensitive layer of PS particles completely covering the anode was prepared. After coating the polymer particles, the coated anode, cathode, PP / PE / PP three-layer separator, and LiPF 6 The electrolyte solution is used to make a pouch battery, in which a heat-sensitive layer is placed between the electrodes and the separator. A control pouch cell was similarly made without the polymer particle coating for comparison.

[0041] The pouch cell was first cycled at room temperature to verify cell performance. The voltage and current of the PS-coated pouch cell and the control cell were monitored over time, and their performance at room temperature was Figure 3a with 3b are shown...

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Abstract

The present application provides a lithium ion battery including a thermal sensitive layer comprising polymer particles. The thermal sensitive layer may be disposed between the electrodes and the separator. When the lithium ion battery is under thermal runaway condition and the internal temperature rises to a critical temperature, the polymer particles undergo a thermal transition process (melting) to form an insulating barrier on the electrodes, which blocks lithium ion transfer between the electrodes and shuts down the internal current of the battery.

Description

technical field [0001] The present application relates to a lithium ion battery, in particular, it has a thermosensitive layer for blocking the passage of lithium ions at a predetermined temperature. Background technique [0002] Li-ion batteries are usually designed with a pressure limiting valve and an external positive temperature coefficient (positive temperature coefficient, PTC) resistor equipped in the case. However, these external devices are not capable of responding when harmful reactions occur at very high rates. [0003] Various mechanisms exist to improve the safety of Li-ion batteries under thermal runaway conditions, such as thermal fuses, PTC material external or internal fuses, and blocking separators. However, none of them can achieve automatic blocking of Li-ion batteries at a predetermined temperature. [0004] Blocking separators are designed to perform thermally induced blocking of Li-ion batteries, and typically have a polyethylene (PE)-polypropylene...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/42H01M10/058H01M50/403H01M50/414H01M50/451H01M50/457H01M50/489
CPCH01M10/0525H01M10/058H01M10/4235H01M50/451H01M50/489H01M50/414H01M50/457H01M50/403H01M2200/10Y02E60/10H01M50/46Y02P70/50
Inventor 刘晨敏徐业明郭志豪涂宁
Owner NANO & ADVANCED MATERIALS INST
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