Semi-solid electrodes having high rate capability

A semi-solid, multiplier technology, applied to active material electrodes, battery electrodes, circuits, etc., can solve problems such as low capacity, low energy density, and reduced ion conductivity of electrodes

Active Publication Date: 2015-11-18
24M TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] This known method usually involves complex and expensive manufacturing steps (e.g. casting electrodes) and is only suitable for electrodes of limited thickness, e.g. less than 100 μm (thickness of final single-sided coating)
These known methods of preparing electrodes of finite thickness lead to batteries with lower capacity, lower energy density and high ratio of inactive components to active materials
Additionally, binders used in known electrode formulations can increase distortion and reduce the ionic conductivity of the electrode

Method used

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  • Semi-solid electrodes having high rate capability
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  • Semi-solid electrodes having high rate capability

Examples

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Effect test

Embodiment 1

[0164] Electrochemical half-cell Example 1 (also referred to as "Example 1") was prepared using a semi-solid cathode and a Li metal anode. The LFP semi-solid cathode was prepared by combining 45% by volume of LFP and 2% by volume of carbon black with ethylene carbonate / dimethyl carbonate / LiPF 6 Base electrolyte mix. The cathode slurry was prepared using a batch mixer with roller sharpening fittings. The mixing is carried out at 100 rpm for about 2 minutes. Semi-solid slurry has a mixing index greater than 0.9 and 1.5×10 -4 S / cm conductivity. The slurry was made into electrodes about 250 μm thick and tested in a Swagelok battery configuration against Li metal anodes. A Maccor battery tester was used to test the battery and cycled between the voltage range of V=2-4.2V. The battery is charged using a constant current and constant voltage (CC-CV) program, where the constant current rate is C / 10 and C / 8 for the first two cycles, and C / 5 for the subsequent cycles. After constant ...

Embodiment 2

[0166] Electrochemical half-cell Example 2 (also referred to as "Example 2") was prepared using a semi-solid cathode and a lithium metal anode. The cathode slurry was prepared as follows: Li(Mn, Co, Ni) O 2 And 8 vol% carbon additive with ethylene carbonate / dimethyl carbonate / LiPF 6 Base electrolyte mix. The cathode slurry was prepared using a batch mixer equipped with roller sharpening fittings. The mixing was carried out at 100 rpm for about 4 minutes. The slurry was made into electrodes about 250 μm thick and tested in a Swagelok battery configuration against Li metal anodes. A Maccor battery tester was used to test the battery and cycled between the voltage range of V=2-4.3V. Use the CC-CV program to charge the battery, where the constant current part is C / 10 and C / 8 for the first two cycles, and C / 5 for the subsequent cycles. After the constant current charging step, the constant voltage is maintained at 4.2V until the charging current drops below C / 20. The battery is ...

Embodiment 3

[0168] Electrochemical Full Cell Example 3 (also referred to as "Example 3") consists of 35 vol% Li(Ni, Mn, Co) O 2 The semi-solid cathode is prepared so that the semi-solid cathode has a thickness of about 250 μm. Compared to a semi-solid anode prepared with 40% by volume of graphite and 2% by volume of carbon additives, the anode has a thickness of about 500 μm. The NMC semi-solid cathode was prepared by combining 35 vol% NMC and 8 vol% carbon black with ethylene carbonate / dimethyl carbonate / LiPF 6 Base electrolyte mix. The cathode slurry is prepared using a batch mixer equipped with a roll blade. The mixing was carried out at 100 rpm for 4 minutes. The graphite semi-solid anode is prepared by mixing 40 vol% graphite and 2 vol% carbon black using the same electrolyte as the cathode. The anode slurry formulation was mixed at 100 rpm for about 30 seconds, producing a semi-solid anode suspension. The electrode is used to form an NMC-graphite-based electrochemical full battery,...

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Abstract

Embodiments described herein relate generally to electrochemical cells having high rate capability, and more particularly to devices, systems and methods of producing high capacity and high rate capability batteries having relatively thick semi-solid electrodes. In some embodiments, an electrochemical cell includes an anode, a semi-solid cathode that includes a suspension of an active material and a conductive material in a liquid electrolyte, and an ion permeable membrane disposed between the anode and the cathode. The semi-solid cathode has a thickness in the range of about 250 μm-2,500 μm, and the electrochemical cell has an area specific capacity of at least 5 mAh / cm2 at a C-rate of C / 2.

Description

[0001] Cross references to related applications [0002] This application is a partial continuation of U.S. Patent Application No. 13 / 872613 entitled "Semi-solid Electrode with High Rate Performance" filed on April 29, 2013 and claims the right of priority, which claims to enjoy December 13, 2012 Priority of US Provisional Application No. 61 / 736798 filed on March 15, 2013 and US Provisional Application No. 61 / 787382 filed on March 15, 2013, their respective disclosures are incorporated herein by reference in their entirety. [0003] This application also claims the priority and rights of US Provisional Application No. 61 / 787382 entitled "Semi-solid Electrode with High Rate Performance" filed on March 15, 2013, the disclosure of which is incorporated herein by reference in its entirety. [0004] This application also claims the priority and rights of U.S. Provisional Application No. 61 / 736798 entitled "Electrochemical Slurry Composition with High Rate Performance" filed on December 13,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/58H01M4/485H01M10/04
CPCH01M8/20H01M8/18H01M8/188H01M8/225Y02E60/528H01M4/02H01M4/485H01M4/58H01M10/04Y02E60/50Y02E60/10
Inventor Y-M·蒋M·杜度塔R·霍尔曼P·利姆通科T·谭
Owner 24M TECH INC
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