Enhancing low electronic conductivity materials in all active material electrodes through multicomponent architecture

Cai, Chen; Koenig, Gary M.

doi:10.1039/d2ya00269h

Cited by 9 publications

(24 citation statements)

References 68 publications

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“…Such behavior was similar to other multicomponent AAM cathodes. For example, an AAM electrode composed of 45 wt % LCO (higher electronic conductivity) and 55 wt % LNMO (higher gravimetric capacity) had the best rate capability among materials with varying amounts of LCO/LNMO . In that work, the rate capability improvement was attributed to the formation of a percolated LCO network.…”

Section: Resultsmentioning

confidence: 90%

“…(b) Ragone plot for cells with AAM electrodes in this work and prior reports, where all had areal capacity over 10 mAh cm –2 . Anode and cathode materials are indicated on the plot. , …”

Section: Resultsmentioning

confidence: 99%

“…Above a content threshold, the percolated LCO network increased the matrix electronic conductivity, which then no longer was the limiting factor during cycling. Multicomponent blend electrodes resulted in much better electrochemical outcomes relative to either individual material in isolation . In addition, the blended AAM electrodes rendered the best cycling stability, which was speculated to result from improved mechanical properties …”

Section: Introductionmentioning

confidence: 99%

“…Li 4 Ti 5 O 12 (LTO) anodes and LiCoO 2 (LCO) cathodes have often been used in AAM electrodes in part because of their high electronic conductivity, >10 S m –1 across the range of lithiation expected during charge/discharge. ,, Additional evidence to support the important role of electroactive material electronic conductivity was a report using LiMn 2 O 4 (LMO) as an AAM cathode, where limited rate capability was attributed to low material electronic conductivity, and dopants which increased electronic conductivity also slightly mitigated the cycling limitations . Besides material doping, another approach to address limited electronic conductivity of a desired electroactive material was recently reported . A multicomponent blend AAM electrode was fabricated with a high energy, low electronic conductivity material combined with a lower energy, high electronic conductivity material.…”

Section: Introductionmentioning

confidence: 99%

“…A multicomponent blend AAM electrode was fabricated with a high energy, low electronic conductivity material combined with a lower energy, high electronic conductivity material. For that specific study, high electronic conductivity LCO particles and relatively low electronic conductivity LiNi 0.5 Mn 0.5 O 2 (LNMO) particles were physically blended and fabricated into AAM electrodes . LCO and LNMO were both layered phase oxides, and the resulting phases remained segregated.…”

Section: Introductionmentioning

confidence: 99%

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Stable Multicomponent Multiphase All Active Material Lithium-Ion Battery Anodes

Cai

Gao

Sun

et al. 2023

ACS Appl. Mater. Interfaces

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Due to their high energy density, lithium-ion batteries have been the state-of-the-art energy storage technology for many applications. Energy density can be further improved by engineering of the electrode architecture and microstructure, in addition to more common improvements via materials chemistry. All active material (AAM) electrodes consist of only the electroactive material that stores energy, and such electrodes have advantages to conventional composite processing with regards to improved mechanical stability at increased thicknesses and ion transport properties. However, the absence of binders and composite processing makes the electrode more vulnerable to electroactive materials with volume change upon cycling. Also, the electroactive material must have sufficient electronic conductivity to avoid large matrix electronic overpotentials during electrochemical cycling. TiNb 2 O 7 (TNO) and MoO 2 (MO) are electroactive materials with potential advantages as AAM electrodes due to relatively high volumetric energy density. TNO has higher energy density, and MO has much higher electronic conductivity, and thus a multicomponent blend of these materials was evaluated as an AAM anode. Herein, blends of TNO and MO as AAM anodes were investigated, where this is the first use of a multicomponent AAM anode. Electrodes that had both TNO and MO had the highest volumetric energy density, rate capability, and cycle life relative to single component TNO and MO anodes. Thus, using multicomponent materials provides a route to improve AAM electrochemical systems.

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Section: Resultsmentioning

confidence: 90%

“…(b) Ragone plot for cells with AAM electrodes in this work and prior reports, where all had areal capacity over 10 mAh cm –2 . Anode and cathode materials are indicated on the plot. , …”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%