Recently, CCID Research Institute released the “Research on the Development of Key Materials for Solid-state Lithium Batteries”, in order to provide some development suggestions for the development of solid-state lithium batteries in my country.

The report discusses the performance requirements, development status, problems faced and CCID’s suggestions of solid-state lithium battery materials.

01

Solid-state lithium battery and performance requirements for materials

Solid-state lithium batteries are a class of lithium batteries that use solid electrode materials and solid electrolyte materials.

Different from liquid lithium batteries and mixed solid-liquid lithium batteries, the battery cells of solid-state lithium batteries do not contain any liquid electrolytes, liquid solvents and liquid additives.

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Solid-state lithium batteries show great advantages in safety, cycleability, high temperature resistance, energy density, etc., and have different requirements for material performance indicators.

Lithium Ion Migration Number

If the migration number is too low, anions will accumulate on the surface of the electrode, resulting in increased polarization of the battery and increased internal resistance of the battery.

Solid-solid interface compatibility

Relevant materials should have good physical and chemical compatibility to ensure sufficient contact between solid electrolyte and solid electrode, stable interface contact during service, not easy to separate, and no electrochemical side reaction between electrolyte and electrode.

The above are some of the reports. For details, please pay attention to the subscription number “ccid-2014”, or scan the QR code below, and leave “1015” + your email address, we will send it to you as soon as possible!

02

Key materials for solid-state lithium batteries

According to the composition of battery materials, solid-state lithium batteries can be divided into solid electrolytes, positive active materials, negative active materials, conductive agents and current collectors.

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Solid-state electrolyte is the core component of solid-state lithium battery. At present, there are three main categories: polymer solid-state electrolyte, oxide solid-state electrolyte, and sulfide solid-state electrolyte.

polymer solid electrolyte

The polymer solid electrolyte is composed of a polymer matrix and a lithium salt complexed.

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oxide solid electrolyte

Oxide solid electrolytes have the advantages of high ionic conductivity, excellent high temperature resistance, wide electrochemical window, and lithium ion migration number close to 1, which are the current research and development hotspots.

Oxide solid electrolytes can be divided into thin film type and non-film type according to application scenarios.

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Sulfide solid electrolyte

Sulfide solid electrolyte is currently the electrolyte with the highest ionic conductivity in the solid electrolyte system, but it is the most difficult to develop.

Sulfide solid electrolytes can be divided into binary sulfides and ternary sulfides according to their constituent components.

Negative active material

Solid-state lithium batteries can use almost all negative electrode materials of liquid lithium batteries, including carbon group materials, oxide materials, etc.

The theoretical specific capacities of silicon-based and tin-based are as high as 4200 mA h/g and 994 mA h/g, which are expected to become a new generation of anode materials.

Relying on the inherent advantages of solid-state electrolytes, metal lithium and lithium alloys are also one of the main anode materials for solid-state lithium batteries, with a theoretical specific capacity of 3860 mA h/g.

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The above are some of the reports. For details, please pay attention to the subscription number “ccid-2014”, or scan the QR code below, and leave “1015” + your email address, we will send it to you as soon as possible!

03

Development status of solid-state lithium batteries in my country

CCID think tank has sorted out the development status of my country’s solid-state lithium batteries from three aspects: battery system, market prospects, and school-enterprise cooperation.

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04

The main problems faced by my country’s solid-state lithium battery material industry

CCID Think Tank analyzed the main problems faced by the development of my country’s solid-state lithium battery material industry from three aspects: R&D strength, key technologies, and industry standards.

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05

Countermeasures and suggestions for promoting the development of solid-state lithium battery materials in my country

CCID think tank put forward countermeasures and suggestions to promote the development of solid-state lithium battery materials in my country from three aspects: industrial innovation system, industrialization path, and international influence.

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