accessing the bottleneck in all-solid state batteries, lithium-ion transport over the solid-electrolyte-electrode interface - lithium ion polymer battery

Solid-
National battery may offer more lithium
Large-required energy density and safety of ion batteries
Large-scale production of electric vehicles.
One of the key challenges facing high-tech
Stable performance-
The state battery is a large impedance formed by the electrode-electrolyte interface.
However, a direct assessment of lithium
Ion transport on the real electrode-electrolyte interface is tedious.
Let's report two.
Size lithium
Investigation of spontaneous properties of lithium by ion exchange NMR
Ion transport, providing insights into the effects of electrode preparation and battery cycling on lithium
Ion transport on the interface between Argyrodite solids-
Electrolyte and sulfur electrodes.
The interface conductivity display is strongly dependent on the preparation method and shows a sharp drop after several electrolysis (dis)
Charge cycling due to loss of interface contact and increase of diffusion barrier.
Reported Exchange NMR helps non-
Invasive and selective measurement of lithium
Ion interface migration provides guidance for future design of all-electrolyte-electrode interfacesolid-Status battery. The high-
Energy density and long cycle life of lithium
Ion batteries have promoted the development of mobile electronic devices. recently, electric vehicles (EV’s)
Stabilize the grid and balance the supply and demand of renewable energy.
However, the use of liquid organic electrolyte in lithium
Ion batteries raise safety issues, especially in relatively large systems used in electric vehicles and grid storage.
The source of safety risk is the gas generation and leakage of flammable liquid organic electrolyte when working at high pressure and/or high temperature.
A potential solution is to use solids
National electrolyte, the goal that has been pursued for decades.
Recently, Gustate lithium-
The study of ion batteries has been greatly strengthened, thanks to the development of several structural families of highly conductive solid electrolyte, including compounds similar to LISICON, argyrod, garnets and NASICON-Type structure.
In addition to improving battery safety, solid electrolyte may provide additional benefits.
These include the design freedom of the battery geometry and the improvement of the efficiency of the battery packaging, which will increase the actual battery energy density.
Also, some solids-
State electrolyte may provide a larger window of electrochemical stability compared to liquid electrolyte, or lead to a narrow stable interface passivation layer, which helps to extend cycle life and provides a high adoption
This in turn further increases the energy density of the battery.
On the anode side, solid-
The National battery opens the door for the safety application of Li-
The metal also increases the energy density by inhibiting the formation of shoot crystals.
Although great progress has been made in the synthesis of high-quality lithium
Ionic conductive solid electrolyte with almost all rate capabilitiessolid-
State batteries are poor, especially those that use a cathode that has experienced a high volume change
Based on the electrode and those with high utilization
Voltage cathode.
Although a large amount of lithium is provided
Ion conductivity, bad rate of solids and cyclic properties
The National battery is considered a high resistance of lithium-
Ion transfer at the solid-solid electrode-electrolyte interface.
Although it is difficult to determine experimentally, the source of the interface resistance will depend on the combination of the electrode-electrolyte and its preparation route.
Both chemical non-phase and narrow solid electrolyte electro-chemical windows may lead to high resistance of the interface layer to lithiumion transport.
Driven by the potential difference between the positive electrode and the electrolyte, the interface will generate a space charge, potentially leading to local lithium-
The ions of the electrolyte are depleted.
This brings extra obstacles to lithium.
Ion transport on the solid-solid electrode-electrolyte interface.
Finally, one of the biggest possible challenges is mechanical stability, where the electrode material is in (dis)
The charge may cause a loss of contact between the electrode and the electrolyte particles, thus blocking the lithium-
Ion transfer on the interface.
These challenges show that whether reliable or not,
The National battery will be able to provide the performance required for electric vehicles, which will depend on the development of a stable interface that allows for simple ion charge transfer.
Several strategies are developed to improve the interface resistance;
One example of this includes coating the electrode with an oxide barrier layer to achieve highrate cycling.
To guide the design of the interface, it is essential to study the interface reaction and charge transfer on the solid-solid electrode-electrolyte interface.
The most commonly used impedance spectrum for charge transfer resistance is estimated, and the impedance spectrum is in the well-
Definition of solid film
State battery, but difficult in complex solid form, if not impossibleStatus battery.
Using impedance spectrum, it is not important to distinguish between interface and large lithium
Ion conductivity because it detects charge dynamics of dozens of nanometers, including the effects of pores, grain boundaries, and the effects of the solid electrolyte being studied in contact with the electrode.
Nuclear magnetic resonance (NMR)
Spectrum, non
The destructive contactless probe has a high sensitivity to lithium and has been shown to provide unique supplementary information for impedance spectrum
Ion Mobility in bulk battery materials.
Additional opportunities offered by Solid-
3) polymorphism NMR
The phase battery material, consisting of a mixture of multiple electrode phases or electrodes and electrolyte phases, is the possibility to measure spontaneous lithium
Ion exchange between different lithium
Contains phase.
This provides a unique selectivity for charge transfer on the phase boundary and has recently demonstrated that lipcl-LiS solid electrolyte-electrode combination is feasible.
We hired two here.
Dimensional exchange nuclear magnetic resonance spectrum (2D-EXSY)
The spontaneous exchange between the solid electrolyte and the electrode provides a unique quantitative insight.
Difference in chemical displacement by NMR, lithium-
At different stages of preparation and before and after circulation, ion migration was determined at the interface of lipbr-LiS cathode mixture, giving an unprecedented insight into the evolution of resistance between solid electrolyte and cathode.
Nano-sized LiS and intimate contact with argyrodite lipbr electrolyte proved to be necessary to provide measurable charge transfer at the interface.
Although the charge transfer on the lipbr-LiS interface is easy, in the original, uncirculated cathode mixture, the contact area is small, resulting in an order of magnitude smaller interface conductivity than volume conductivity.
Lithium after cycling
The ion dynamics on the interface has dropped sharply, which is likely due to a large volume change in the contact of the damaged interface, or it may be due to the formation of the side product that increases the diffusion barrier.
Both of these factors are responsible for the decline in capacity during repeated riding.
These observations show that the development of strategies to maintain interface integrity during the cycle process is critical and introduces the unique ability of the exchange NMR to study the interface charge transfer, allowing direct and non-
Invasive quantification.