IEST Solid Electrolyte Testing System(SEMS1100)

Introduce: SEMS1100 is a multifunctional analysis system for solid electrolyte test samples, is a fully automatic measuring device for the electrochemical performance of solid electrolyte that integrates tableting, testing and calculation. The system adopts integrated design, including pressurization module, electrochemical test module, compaction density measurement module, and clamp, etc., which is applicable to the test of various oxides, sulfides, polymers and other kinds of electrolytes.

Features:

  1. New methods for evaluating ionic conductivity, electronic conductivity, and electrochemical performance of solid-state electrolytes;
  2. Applicable to the various oxides, sulfides, polymers and other solid electrolyte testing;
  3. Multifunctional integrated equipment for tableting, electrochemical performance testing and calculation.
  4. High pressure (up to 600MPa): Suitable for preparation of green pellet for oxide solid electrolyte;
  5. Real-time Thickness Measurement: In-situ thickness measurement of solid electrolytes;
  6. Sealed Mold: Suitable for testing of sulfide solid electrolytes in normal environments;
  7. Can be automatically interfaced with electrochemical workstation software;
  8. Compatible for use with gloveboxes.

Application:

  • Electrochemical stability window
  • Powder tableting
  • Solid-state battery cycle performance
  • Electronic conductivity & compaction density
  • Ionic conductivity

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Description

IEST Comprehensive Solid-State Battery Testing Solutions

At IEST, we provide a comprehensive suite of cutting-edge testing solutions designed specifically for solid-state batteries—from material-level characterization to full-cell performance evaluation, from multi-dimensional powder compression & EIS (SEMS series) to glovebox-integrated single-particle mechanics, automatic mold-pressing, SWE in-situ swelling analyzers and BPD pressure/temperature mapping. For the details, please check our Solid-State Battery Testing Solutions

IEST Comprehensive Solid-State Battery Testing Solutions

1. The Importance of Electrochemical Performance of Solid-state Electrolyte

Driven by the rapid development of the lithium-ion battery (LIB) industry, improving the energy density and safety of the battery is an important research direction of for the LIB researchers. All-solid state battery is considered to be the most promising secondary battery with high safety and high specific energy in the future. Solid electrolyte (SE) is the most important core component, and the most important performance indicators used to judge the performance of solid electrolyte are ionic conductivity,Li-metal interface stability and full cell performance. On the one hand, the density, roughness and integrity of the pressed solid electrolyte sheet determine the conductivity of the solid electrolyte and the cycle performance of the full cell. On the other hand, the accuracy of the test results can only be guaranteed by the stable and uniform stress application and the accurate thickness measurement during the experiments. Therefore, the production and testing system that can exert stable and standardized pressure plays a key role in the development of solid electrolyte and lithium metal battery.

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2. Limitations of Traditional Production Testing of Solid-State Electrolytes

2.1 Traditional tableting

The traditional process generally uses a manual tablet press to press the solid electrolyte powder. The force of traditional manual method is uneven and cannot reach a high pressure, which will cause the thickness of SE sheet asymmetry with relatively low density, and finally trigger the depression, edge falling and fragmentation, etc., of the SE sheet after demoulding. Moreover, the traditional method need take a lot of time for the applying and releasing pressure, which seriously affects the experimental process and research efficiency.

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2.2 Traditional test procedure

The traditional test method just simply holds the ceramic chip to measure the electrochemical properties. Because the force of the traditional test method is uneven, the maximum of the applied force is also limited, and the applied pressure cannot be quantified and maintained at a fixed value, the compression condition will exist great differences for samples with different thickness, area and roughness. Thus the experimental conditions cannot be normalized and standardized, and the measurement results will have poor consistency and low reproducibility.

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2.3 Condition exploration

Traditional clamps or fixture cannot provide uniform, stable and variable pressure for the preparation of solid electrolyte sheets or the exploration of test conditions.

2.4 Measurement mode

Only constant pressure, non-quantifiable pressure, small pressure range, and unstable compression condition during the test.

3. IEST Innovative Solid Electrolyte Testing Solutions

For the testing method of the ionic conductivity of the solid electrolyte, we refer to the T/SPSTS 019-2021 standard, and combine with ther the testing method of the ionic conductivity of the solid electrolyte, we refer to the T/SPSTS 019-2021 standard, and combine with the general test process in the industry, including the standardization of sample preparation, fixture design, test device, and test conditions:

3.1 Sample preparation

  • Oxide materials must be subject to high-temperature crystallization treatment (generally above 900 ℃) to ensure good ion transport performance. Generally, the density of electrolyte sheet is>95%, and the thickness is>500 μm; In terms of electrode preparation, the electrode must be polished with sandpaper with more than 3000 meshes and sprayed with conductive gold of a certain thickness (>5 μm) , after which the good interface contact can be ensured. Grind the edge of the metal with sandpaper to prevent short circuit. Use a multimeter to ensure the electronic continuity between any two points on the surface.
  • The sulfide materials can directly be tested by cold compression process. During the test, a certain pressure (usually >200 MPa) must be guaranteed to ensure good ion transport performance.

3.2 Fixture design

  • A flat and compact contact surface, and a stable and uniform force application structure (quantifiable pressure) are required.

3.3 Test device

  • An electrochemical workstation system capable of measuring high frequency impedance (>1MHz) is required. A short lead with good signal shielding is also required

3.4 Test conditions

  • Select appropriate temperature and humidity, quantization pressure, frequency range and amplitude voltage.

For the electrochemical performance of solid lithium battery (charge-discharge cycle, electrochemical window), we combine the general test process in the industry, including the sample preparation, fixture design, test device, and standardization of test parameters:

3.5 Electrolyte preparation

  • Oxide materials must be subject to high-temperature crystallization treatment (generally above 900 ℃) to ensure good ion transport performance. Generally, the density of electrolyte sheet is>95%, and the thickness is>500 μm. It must be with strictly polished by the sandpapers.
  • During the direct cold pressure test of sulfide materials, a certain pressure (usually>200MPa) must be guaranteed to have good ion transport performance.

3.6 Electrode preparation

  • The positive electrodes shall be prepared by scraping, screen printing, sputtering deposition and other methods. The negative electrodes shall be prepared by surface treatment, melting, physical/chemical deposition, pressing and other methods to ensure good interface contact.

3.7 Fixture design

  •  It needs a flat and compact contact surface, and a stable and uniform force application structure (quantifiable pressure).

3.8 Test conditions

  • Appropriate temperature and humidity, certain quantitative pressure, and strict sealing device.

4. Applications

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5. IEST Innovative Solid Electrolyte Testing Solutions 2

Multi-dimensional Solid Electrolyte Testing System-SEMS3200

The Multi-dimensional Solid Electrolyte Testing System(SEMS) facilitates comprehensive powder-level material evaluation. lt combines atmospheric protection system, pressurization system, pressure measurement system, thickness measurement system, pressing & lock system, electrochemical testing system, integrated with unified software to enable in-situ monitoring of compaction density and electrochemical performance under adjustable pressure and atmospheric conditions.
  • Glove Box Atmosphere Control System
  • Pressurization, Pressure Measurement, and Thickness Measurement System
  • Pressure Locking Mechanism
  • Electrochemical Testing System
  • All-in-One Software

Multi-Dimensional Solid-State Electrolyte Testing System

Applications

Case 1. Uniform Powder Pellet Preparation

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  • The equipment can be used to prepare the green pellet of Oxide solid electrolytes.

Case 2. Powder ionic conductivity

Test Conditions:

  • EIS frequency band: 10MHz~0.1Hz
  • Voltage disturbance: 10mV

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  • The electrochemical impedance spectroscopy (ElS) module automatically measures the ionic conductivity of polyelectrolytes under varying pressures

Case 3. Powder electronic conductivity

Sample Preparation: SUS/LPSC/SUS symmetric battery, 250 MPa, 0.5 h
Test Parameters: 0.5 V constant voltage for 3 h

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  • The electronic conductivity of the solid electrolyte under varying pressures can be measured with an external electrochemical impedance spectroscopy (EIS) module.

Case 4. Solid-state battery cycle performance

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  • The charge-discharge (CD) module allows for the analysis of the cycling performance of solid lithium metal batteries under varying pressures and different electrochemical parameters.

Case 5. Electrochemical Stabilization Window

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  • Using the SEMS’s cyclic voltammetry (CV) module, the electrochemical stability window of solid electrolytes can be analyzed under different pressure conditions.

Specifications

Scheme 1: high-precision solid electrolyte test system, model SEMS1100

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Scheme 2: simple manual solid electrolyte test device, model SEMS1000 (applied to electrochemical test)

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Scheme 3: simple manual solid electrolyte test device, model SEMS1300 (applied to ionic conductivity test)

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