Solid-state batteries are the next generation of battery technology that combines high energy density and high safety. Major battery manufacturers have chosen to invest and follow up, otherwise they may face the risk of being directly eliminated in future market competition.
On October 23rd, established lithium battery company Sunwoda Electronics Co., Ltd. ("Sinwoda," 300207.SZ), announced its official entry into the all-solid-state battery market. On the same day, Xu Zhongling, President of the Central Research Institute of Sunwoda Power Technology Co., Ltd. ("Sinwoda Power"), a subsidiary of Sunwoda, unveiled the company's new polymer solid-state battery, "Xin Bixiao," at the 2025 New Energy Battery Industry Development Conference held in Shandong.
It's worth noting that this is also the first generation of all-solid-state batteries launched by Sunwoda Power with an energy density of 400Wh/kg. The company plans to complete a 0.2GWh polymer solid-state battery pilot line by the end of 2025. Furthermore, Xu Zhongling announced that Sunwoda has successfully trial-produced lithium metal batteries with an energy density of 520Wh/kg.
It is worth noting that with many companies disclosing progress related to solid-state batteries, the concept of solid-state batteries has ignited the capital market many times this year.
Regarding the commercialization expectations of solid-state batteries, Xu Zhongling told a reporter from The Paper (www.thepaper.cn), "First, we must have breakthroughs in research and development, and secondly, in future market applications. Only after all these breakthroughs are achieved can we truly develop rapidly." He emphasized that the development of new things must be driven by mass production and marketization, and that some application scenarios must be found as entry points, rather than being rolled out across the board in a short period of time.
He believes the industry is generally still in the first stage, which is to achieve breakthroughs in product design and development. "Semi-solid-state batteries are currently in mass production for 3C consumer batteries, and some demonstration applications are being used in new energy vehicles. Full-solid-state batteries are expected to be used in demonstration applications within the next two to three years."
Xu Zhongling believes that the mass production and application of all-solid-state batteries is expected to first break through in fields such as aircraft and robots, which have particularly high requirements for energy density and safety. "Once the industry chain matures and costs are significantly improved, they may be further applied to high-end vehicles. Ultimately, as costs continue to decrease and the industry chain's production capacity continues to increase, I believe there will be room for further cost reductions, and then their application may be extended to mid-range vehicles."
Regarding the mass production schedule of Sunwoda's own all-solid-state batteries, Xu Zhongling gave the answer that it is expected to be the end of 2027. However, he cautiously stated, "This is under the condition that all work is progressing smoothly."
Shenzhen-based Sunwoda is a veteran of China's lithium-ion battery industry. Founded in 1997 by brothers Wang Mingwang and Wang Wei, both from Maoming, Guangdong, Sunwoda initially focused on the consumer battery pack business. In October 2014, Sunwoda incorporated Sunwoda Power, officially entering the electric vehicle battery market.
Xu Zhongling explained that, after its founding, Sunwoda Power proactively developed solid-state battery technology, "and formulated a step-by-step development strategy tailored to local conditions and its own specific circumstances." After years of development, Sunwoda has established a multi-pronged approach, from semi-solid to soft solid, then from polymer to sulfide, and finally to lithium metal super batteries.
Xu Zhongling said that as of now, Xinwangda has completed the development of two generations of solid-state battery technology and three generations of solid-state battery products: the first generation of semi-solid products was developed and completed in 2020, with an energy density of 300Wh/kg; in the first quarter of 2025, the first generation of aviation power battery "Xin Yunxiao 1.0" using semi-solid technology was mass-produced and released, with an energy density of 320Wh/kg, supporting the 100-kilogram aircraft's endurance requirement of 100 kilometers; in the second quarter of 2025, the second-generation aviation power battery "Xin Yunxiao 2.0" using soft solid-state technology was released, with an energy density of 360Wh/kg.
Judging from the parameters announced at the press conference, Xinwangda's latest polymer solid-state battery has an energy density of 400Wh/kg, a cell capacity of 20Ah, a cycle life of 1,200 times, and has passed the 200-degree Celsius hot box test with ultra-high safety.
Regarding core technological breakthroughs, Xu Zhongling stated that the R&D team has conducted systematic innovations in materials, design, and processes. For example, at the electrode level, the polymer solid-state battery cell utilizes ultra-dense solid-state electrodes, significantly reducing the electrode porosity from the conventional 25% to 5%, increasing the positive electrode ion conductivity by 1,000 times, and significantly improving the battery's rate performance. The use of a nano-scale high-entropy anode achieves a theoretical specific capacity of 2,700 mAh/g, equivalent to 7.2 times that of a graphite anode. Initial charge and discharge efficiency reaches 96%, and cycle life is increased by 100%.
Xu Zhongling also stated that his team achieved a breakthrough in the solid-state electrolyte membrane, the most critical and challenging core technology for solid-state batteries. While traditional polymer solid-state electrolytes offer advantages such as low cost, ease of processing, and environmental stability, they also suffer from significant shortcomings such as low ionic conductivity, poor mechanical strength, and insufficient safety.
The strategy proposed by Xinwangda is to "develop flexible high-conductivity lithium polymers, combine them with highly dissociated lithium salts and functional multi-materials, and introduce flame-retardant high-strength polymers at anchor points", taking advantage of their strengths and overcoming their weaknesses to overcome the shortcomings of traditional polymer solid electrolytes. Ultimately, the electrolyte membrane thickness is achieved, consistent with conventional diaphragms, at only 12μm. At the same time, the room temperature ionic conductivity exceeds 2.5 mS/cm for the first time, which is comparable to sulfide solid electrolytes.
Regarding interfacial contact, another key issue in solid-state batteries, Xu Zhongling explained that his team has constructed a highly viscous interface less than 1μm thick on the surface of the high-silicon anode. This ensures high ion conduction, strong adhesion, high ductility, and self-healing properties while ensuring ion conduction. Poor solid-solid interface contact in solid-state batteries is also a global challenge. The rigid solid-solid interface is easily damaged during cycling, leading to interfacial contact failure.
