Currently available high-capacity/high-power lithium ion batteries use organic liquid electrolytes due to their excellent ionic conductivity, which involves problems related to battery safety, durability and reliability. In practice, accidents related to explosion and fires of small-sized lithium ion batteries have been frequently reported across the world. In 2006, for instance, a Dell laptop caught a fire during a conference in Osaka due to a battery manufactured by Sony, which involved in a massive recall, bringing both companies to serious management crises.
[Figure] Fires involving small-sized lithium ion batteries
(Source : The Inquirer, 2006. 6 & Tom's Hardware Forum, 2006. 7.)
In this context, many researchers have studied all-solid state batteries using solid electrolytes instead of liquid electrolytes as an effort to secure safety of lithium ion batteries. All-solid-state batteries are establishing a solid foothold as one of next-generation batteries. It is known that using solid electrolytes helps increase battery performance such as high energy density, high power density and long life. From an economic point of view, solid electrolytes also have many advantages regarding simplification of manufacturing process, battery scale-up/densification and cost reduction.
In general, safety of lithium ion secondary batteries increases in the following order: liquid electrolytes < polymer (gel) electrolyte < solid electrolyte. On the contrary, the performance of rechargeable batteries is in inverse proportion to ionic conductivity of electrolytes. For this reason, the low ion conductivity of electrolytes has been the biggest obstacle to commercialization of all-solid-state batteries. The solid electrolytes reported that have so far been developed have ion conductivity of less than 10-5 S/cm at room temperature. Thus, it is required to develop solid electrolyte materials whose ion conductivity comes close to that of liquid electrolytes (more than10-3 S/cm) and current R&D efforts are focused on reducing interfacial resistance between both electrodes and solid electrolytes and polarization resistance within the battery.
[Figure] Prototype all-solid-state LIBs of major research institutes and companies
(Source: company websites, rearranged by SNE Research)
Considering many technical challenges, all-solid-state LIBs are still far away from commercialization. Nevertheless, Toyota, which has most actively engaged in research in next-generation batteries although it is an automaker, on March, 2013 announced its plan to release PEVs (Plug-In Vehicles, PHEV & BEV) adopting all-solid-state batteries by 2020. Likewise, not that many companies are making intensive R&D efforts to make breakthroughs such as the recent development of solid electrolyte materials and 3-dimensional electrode structures, there will be considerable progress.
This report will provide a comprehensive overview of all-solid-state lithium secondary batteries as one of the most promising post-LiB technologies, including technical backgrounds, technology development trends and patent trends.
Strong Points of this report include:
1) Next-generation rechargeable battery development trends and roadmaps for each country
2) All-solid-state LIB technology issues and key components
3) All-solid-state LIB technology patent trend
4) All-solid-state LIB technology development trends of major research institutes and companies
4) All-solid-state LIB technology applications and commercialization forecast
- Contents -
1. Next-generation rechargeable battery technology development trend
1.1. Next-generation rechargeable battery technology overview
1.2. Next-generation rechargeable battery technology development trend
1.3. Next-generation rechargeable battery development roadmap by country
2. Understanding of all-solid-state LIBs
2.1. Mechanism of all-solid-state LIBs
2.2. Technical characteristics of all-solid-state LIBs
2.3. Key components of all-solid-state LIBs
2.4. Technical issues of all-solid-state LIBs
3. Solid electrolyte for all-solid-state LIBs
3.1. Inorganic solid electrolyte technology
3.2. Organic solid electrolyte technology
3.3. Hybrid solid electrolyte technology
3.4. 3-dimensional electrode design
3.5. Electrode-electrolyte interface control
4. All-solid-state LIB patent trend
5. Technology development and business trend of major research institutes and companies
6. All-solid-state LIB application and commercialization forecast
6.2. Commercialization forecast
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