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Improved rechargeable batteries and production thereof

A battery cell and electrolyte technology, applied in the field of rechargeable electrochemical battery cells, can solve problems such as high flammability, low chemical stability of electrolyte salt, and limited battery operating temperature range

Pending Publication Date: 2021-07-23
BROADBIT BATTERIES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these solvents are highly flammable and pose a safety hazard, causing a large number of battery fire accidents every year.
In addition, LiPF 6 The low chemical stability of electrolyte salts limits the operating temperature range of the battery and necessitates complex and expensive thermal management of the battery pack

Method used

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  • Improved rechargeable batteries and production thereof
  • Improved rechargeable batteries and production thereof
  • Improved rechargeable batteries and production thereof

Examples

Experimental program
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Embodiment

[0029] LiMn x Fe 1-x PO 4 (LMFP for short, also known as LFMP) is a cobalt-free battery cathode material that has attracted much attention in recent years. We tested the cycling stability of the LMFP cathode at a charging voltage of 4.2 V and investigated the effect of electrolyte additives. figure 2 The cathodic stability of the LMFP electrode in different electrolyte variants is shown, and in particular the discharge capacity evolution of the LMFP cathode with respect to the number of charge-discharge cycles is shown. The scale is normalized to the initial discharge capacity of each electrode. In all cases, the initial gravimetric discharge capacity was about 150 mAh / g relative to the LMFP weight. The electrolyte solvent comprises DMC:SCN with a volume ratio of 1:1, further comprising 12% by weight poly(methyl vinyl ether-alanine-maleic anhydride) additive, and further comprising 1 mole of LiDFOB salt. Further electrolyte additives used are shown in the figure. We ha...

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Abstract

An electrochemical cell is disclosed comprising a carbonate : nitrile type solvent mixture based electrolyte. The electrolyte may comprise an alkali salt and / or at least one polymer additive. The alkali salt cation may be a lithium cation and / or the alkali salt anion may comprise an oxalato-borate group. The electrolyte may further comprise one or more electrolyte additives, which may be an SEI improving additive. The anode may comprise carbon. The anode may be an alkali metal anode.The operating voltage and energy density performance of the disclosed invention is at the same level as the performance of presently market- leading battery cells, thereby these disclosed improvements do not come at the expense of battery performance. The utility of the herein disclosed battery electrolyte allows stable cycling of advanced Li-ion battery electrodes, an extended operating temperature range and improves battery safety by making the electrolyte less reactive and volatile than conventional LiPF6 electrolyte salt in carbonate solvents.

Description

technical field [0001] The present invention relates to rechargeable electrochemical battery cells. In particular, the present invention relates to improvements in cost, safety and operating temperature range of electrochemical cells. Background technique [0002] High-performance low-cost batteries are beneficial for many applications, such as: electric vehicles or energy storage applications for the grid. Currently, the market-leading battery technology is lithium-ion battery technology. State-of-the-art batteries use graphite-based anodes, metal oxide cathodes, and organic electrolytes. Commercially, the preferred cathode formulation is a nickel cobalt manganese oxide (NCM) based formulation. However, the prospects for the development of this cathode formulation are hampered by the limited annual supply of cobalt, a known bottleneck to the expected future growth in battery production. Commercially, the preferred electrolyte formulation is based on carbonate solvent wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/505H01M4/525H01M4/58H01M4/583H01M10/0567H01M10/0568H01M10/0569
CPCH01M10/0568H01M10/0567H01M10/0569H01M4/505H01M4/525H01M4/5825H01M4/583H01M4/387H01M4/386Y02E60/10Y02E60/50H01M4/13H01M4/96H01M10/052H01M10/0525H01M4/587H01M2300/004H01M2004/027H01M2004/028H01M2300/0037
Inventor A·科瓦奇D·布朗
Owner BROADBIT BATTERIES OY
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